WEBVTT 1 00:00:00.080 --> 00:00:04.040 There's a very specific feeling. We all recognize it. You 2 00:00:04.080 --> 00:00:06.040 walk into a room, you sit down in a chair, 3 00:00:06.639 --> 00:00:09.800 and it mechanically tilts backward until you are completely horizontal. 4 00:00:09.880 --> 00:00:12.000 Oh yeah, you're totally exposed, right, and. 5 00:00:11.960 --> 00:00:14.359 A blinding light is positions right over your face. Someone 6 00:00:14.400 --> 00:00:17.480 wearing a mask leans over you with you know, sharp 7 00:00:17.640 --> 00:00:22.039 metal instruments. You can't speak, you can't really swallow, and 8 00:00:22.199 --> 00:00:26.480 every survival instinct in your primate brain is just screaming 9 00:00:26.960 --> 00:00:28.920 that you are in a highly vulnerable position. 10 00:00:29.160 --> 00:00:32.359 It is an objectively intense psychological environment. I mean, it 11 00:00:32.560 --> 00:00:35.880 forces a person to suppress their most basic fight or 12 00:00:35.960 --> 00:00:38.920 flight mechanisms just to receive standard. 13 00:00:38.479 --> 00:00:41.079 Healthcare, which is an enormous ask. We expect people to 14 00:00:41.119 --> 00:00:44.520 just open wide and relax. So welcome to today's deep dive. 15 00:00:44.799 --> 00:00:48.079 We are pulling insights from the clinical textbook Dental Secrets, 16 00:00:48.119 --> 00:00:51.799 fourth edition to really chart the complete arc of dental care. 17 00:00:51.960 --> 00:00:55.960 Yeah, we're looking at the intersection of psychology, systemic medicine, 18 00:00:56.000 --> 00:00:59.159 and well structural engineering basically exactly. 19 00:00:59.520 --> 00:01:01.960 The goal here is to elevate your understanding of the 20 00:01:02.000 --> 00:01:05.760 foundational science and clinical mechanics of the field. Whether you 21 00:01:05.840 --> 00:01:09.599 are a dental student preparing for boards, a young professional 22 00:01:09.640 --> 00:01:13.040 refining your practice, or just an avid self learner. This 23 00:01:13.239 --> 00:01:14.400 is your masterclass. 24 00:01:14.480 --> 00:01:17.400 And the clinical reality is that before a practitioner ever 25 00:01:17.439 --> 00:01:19.959 picks up a hand piece or a mouth mirror, they 26 00:01:20.000 --> 00:01:23.519 have to manage the complex psychology of the person sitting 27 00:01:23.599 --> 00:01:24.599 in that chair. 28 00:01:24.359 --> 00:01:27.400 Which is wild because like you're a dentist, not a therapist, 29 00:01:27.480 --> 00:01:30.079 but clinically you have to distinguish between fear and anxiety, 30 00:01:30.200 --> 00:01:33.280 right because they dictate totally different management strategies. 31 00:01:32.719 --> 00:01:35.680 They really do. So fear is the fight or flight 32 00:01:35.760 --> 00:01:40.640 response to a real, immediate present threat. Anxiety, on the 33 00:01:40.640 --> 00:01:44.799 other hand, is an anticipatory apprehension. It's the dread of 34 00:01:44.840 --> 00:01:47.959 a perceived threat that hasn't even happened yet. 35 00:01:48.120 --> 00:01:49.760 Is the thought of the drill exactly. 36 00:01:50.000 --> 00:01:52.079 And up to eighty percent of adults in the US 37 00:01:52.159 --> 00:01:55.879 experience dental anxiety, while about five to ten percent suffer 38 00:01:55.920 --> 00:02:00.480 from true dental phobia, which actually leads to total avoidance. 39 00:02:00.079 --> 00:02:02.599 Of care, which means by the time that phobic patient 40 00:02:02.640 --> 00:02:05.400 actually shows up in the clinic, it is usually because 41 00:02:05.400 --> 00:02:09.479 they are in just agonizing pain, like this psychological barrier 42 00:02:09.520 --> 00:02:12.039 has finally been breached by physical trauma. 43 00:02:12.120 --> 00:02:15.960 Right, and that specific environment we described earlier, horizontal touched 44 00:02:15.960 --> 00:02:19.159 by an authority figure, unable to speak, complete loss of 45 00:02:19.199 --> 00:02:22.039 control that acts as a textbook trigger for post traumatic 46 00:02:22.080 --> 00:02:22.879 stress disorder. 47 00:02:23.120 --> 00:02:26.439 A patient with a history of trauma can experience severe 48 00:02:26.560 --> 00:02:31.080 retraumatization right there in the chair. But the text suggests 49 00:02:31.120 --> 00:02:36.599 these practical, seemingly minor adjustments that fundamentally alter that dynamic. 50 00:02:36.759 --> 00:02:39.319 Yeah, things like keeping the chair in a more upright 51 00:02:39.319 --> 00:02:42.680 position rather than fully supine that prevents the feeling of 52 00:02:42.719 --> 00:02:46.080 being pinned down, or offering a physical barrier like a 53 00:02:46.120 --> 00:02:49.919 blanket or a lead apron which can provide a grounding sensation. 54 00:02:49.759 --> 00:02:53.439 And most crucially, establishing a clear stock signal, Right, like 55 00:02:53.599 --> 00:02:56.639 just raising a hand that transfers a measure of control 56 00:02:56.719 --> 00:02:59.240 back to the patient. It's giving them the remote control 57 00:02:59.280 --> 00:02:59.960 to their own treatment. 58 00:03:00.280 --> 00:03:03.840 It completely reframes the power dynamic, and this actually ties 59 00:03:03.879 --> 00:03:07.639 directly into a fascinating physiological response, which is the gag reflex. 60 00:03:07.960 --> 00:03:10.360 Oh right, we were discussing the tickle analogy earlier. 61 00:03:10.560 --> 00:03:14.520 Yeah, so you cannot tickle yourself because your cerebellum predicts 62 00:03:14.520 --> 00:03:18.319 the sensory consequences of your own movements. There's no surprise, 63 00:03:18.560 --> 00:03:21.800 no perceived threat, and you are entirely in control. 64 00:03:22.039 --> 00:03:24.919 And the gag reflex in the dental chair operates on 65 00:03:25.319 --> 00:03:27.599 like a very similar neurological wavelength. 66 00:03:27.759 --> 00:03:32.000 It's a profound example of physiology reacting to psychology. While 67 00:03:32.039 --> 00:03:35.439 the gag reflex is a genuine cranial nerve response designed 68 00:03:35.439 --> 00:03:38.759 to protect the airway, in the dental setting, it frequently 69 00:03:38.840 --> 00:03:42.120 manifests as a physical reaction to severe anxiety. 70 00:03:42.240 --> 00:03:44.800 It's driven by a fear of airway obstruction or just 71 00:03:44.800 --> 00:03:46.719 a profound loss of control exactly. 72 00:03:46.800 --> 00:03:48.719 I mean, if a patient can eat normally and swallow 73 00:03:48.759 --> 00:03:51.960 their own saliva at a restaurant without gagging, their baseline 74 00:03:51.960 --> 00:03:56.159 physiology is completely intact. The hypersensitive gagging in the operatories 75 00:03:56.240 --> 00:03:58.840 driven by the psychological context of the environment. 76 00:03:59.360 --> 00:04:03.639 So changing the physiological response requires changing the communication strategy. 77 00:04:04.120 --> 00:04:07.919 The traditional paternalistic model of dentistry, where the clinician acts 78 00:04:07.960 --> 00:04:11.560 as the ultimate guardian, dictating treatment that often exacerbates that 79 00:04:11.639 --> 00:04:12.400 loss of control. 80 00:04:12.599 --> 00:04:16.000 Yeah, the field is shifting toward a deliberative model that 81 00:04:16.040 --> 00:04:19.079 positions the clinician as a teacher and a partner, and 82 00:04:19.120 --> 00:04:23.439 that partnership even extends to the linguistics. Of care like. 83 00:04:23.480 --> 00:04:27.480 Using negative commands. If a clinician says, don't close your mouth, 84 00:04:27.800 --> 00:04:30.879 human cognition dictates that the brain must first visualize the 85 00:04:30.920 --> 00:04:33.120 act of closing before it can negate the action. 86 00:04:33.439 --> 00:04:37.120 Right, you are inadvertently priming their motor cortex to perform 87 00:04:37.160 --> 00:04:40.199 the exact action you want to avoid. The alternative is 88 00:04:40.279 --> 00:04:44.959 utilizing positive, permissive language. Directing a patient to say rest 89 00:04:45.040 --> 00:04:48.920 open widely gives the brain a direct, non threatening command 90 00:04:48.920 --> 00:04:49.680 to process. 91 00:04:49.800 --> 00:04:52.560 It's almost like being a hostage negotiator before you can 92 00:04:52.600 --> 00:04:54.519 be a surgeon. You have to de escalate the brain 93 00:04:54.560 --> 00:04:56.519 before you can treat the body. But I have to 94 00:04:56.560 --> 00:04:58.680 push back a little here. Is it really a general 95 00:04:58.759 --> 00:05:01.680 dentist job to act as a psychologist or should they 96 00:05:01.720 --> 00:05:05.360 just refer patients with severe PTSD or anxiety to a specialist. 97 00:05:05.600 --> 00:05:09.000 It's a fair question, but the text asserts that fear 98 00:05:09.160 --> 00:05:13.800 dissolves in a trusting relationship. The clinician's demeanor, you know, 99 00:05:13.920 --> 00:05:18.800 maintaining eye contact, leaning forward to show active listening, using 100 00:05:18.800 --> 00:05:22.000 that permissive language that is often the primary clinical tool 101 00:05:22.120 --> 00:05:24.040 for ninety percent of anxious patients. 102 00:05:24.279 --> 00:05:27.600 Wow, So that psychological management is really just the preamble 103 00:05:27.639 --> 00:05:30.519 to the diagnostic fates because once you have a communicative 104 00:05:30.560 --> 00:05:35.040 calm patient, the oral cavity becomes an incredibly precise diagnostic 105 00:05:35.079 --> 00:05:37.240 window into their systemic physiology. 106 00:05:37.319 --> 00:05:40.759 Oh, absolutely, before touching a single tooth, the medical history 107 00:05:40.839 --> 00:05:44.040 dictates the boundaries of safe treatment. The systemic risks are 108 00:05:44.079 --> 00:05:44.839 just immense. 109 00:05:45.079 --> 00:05:48.079 Let's talk about bisphosphonates, like if a patient is taking 110 00:05:48.120 --> 00:05:50.959 them for osteoporosis or as part of a cancer treatment regimen. 111 00:05:51.079 --> 00:05:54.560 Yeah. So, bisphosphonates function by binding to hydroxy appetite and 112 00:05:54.600 --> 00:05:58.360 inducing apoptosis in osteoclasts. Those are the cells responsible for 113 00:05:58.399 --> 00:06:02.560 breaking down bone effectively halts bone turnover and remodeling. 114 00:06:02.959 --> 00:06:06.439 And the mandible and maxilla have incredibly high turnover rates 115 00:06:06.480 --> 00:06:09.160 right because of the constant mechanical stress of chewing. 116 00:06:09.480 --> 00:06:12.079 Exactly, So, if you extract a tooth in a patient 117 00:06:12.120 --> 00:06:15.480 on these medications, the bone cannot heal. It can trigger 118 00:06:15.560 --> 00:06:20.079 osteonecrosis of the jaw, where the evascular bone literally dies 119 00:06:20.120 --> 00:06:22.360 and remains exposed to the oral microbiome. 120 00:06:22.800 --> 00:06:26.680 That is terrifying. Let's look at another systemic clue that 121 00:06:26.800 --> 00:06:31.519 manifests orally, say a patient presents with absolutely flawless oral 122 00:06:31.560 --> 00:06:36.040 hygiene no calculus, no plaque, diligent home care. Yet they 123 00:06:36.040 --> 00:06:38.360 present with spontaneous gingeal bleeding. 124 00:06:38.600 --> 00:06:41.639 That is a massive red flag. When you eliminate local 125 00:06:41.680 --> 00:06:46.920 etiologic factors, the diagnostic focus has to shift systemically. Spontaneous 126 00:06:46.959 --> 00:06:49.720 gingal bleeding in an otherwise healthy looking mouth is a 127 00:06:49.759 --> 00:06:52.399 primary clinical indicator of acute leukemia. 128 00:06:52.800 --> 00:06:54.720 Wait, really just from bleeding gums? 129 00:06:54.839 --> 00:06:57.959 Yeah, because the malignant infiltration of the bone marrow suppresses 130 00:06:58.000 --> 00:07:03.439 the production of normal hematopoietics. That leads to profound thrombocytepenia. 131 00:07:02.560 --> 00:07:04.199 Meaning a severe lack of platelets. 132 00:07:04.519 --> 00:07:08.680 Right. Without sufficient platelets, the microvasculature of the gingiva simply 133 00:07:08.720 --> 00:07:11.959 cannot maintain hemostasis, resulting in uncontrolled bleeding. 134 00:07:12.160 --> 00:07:15.759 Okay, what about this clinical presentation. A patient comes in 135 00:07:15.800 --> 00:07:22.560 with advanced supuritive peridontal disease, but they also mentioned experiencing polyuria, polyphagia, 136 00:07:22.920 --> 00:07:24.040 and polydipsia. 137 00:07:24.279 --> 00:07:29.360 Ah, that specific triad frequent urination, constant hunger, and constant 138 00:07:29.399 --> 00:07:36.800 thirst paired with rapid aggressive periodontal breakdown strongly suggests uncontrolled diabetes. 139 00:07:36.240 --> 00:07:40.160 Molitis because the high blood sugar messes with the immune system. 140 00:07:39.959 --> 00:07:44.720 Precisely chronic hyperglycemia leads to the formation of advanced glycation 141 00:07:44.959 --> 00:07:49.319 end products, which severely impair wound healing and neutrophil chemotaxis. 142 00:07:50.000 --> 00:07:54.120 The immune cells essentially become sluggish, allowing the subgingible anaerobic 143 00:07:54.160 --> 00:07:57.000 bacteria to devastate the periodontal tissues unhindered. 144 00:07:57.120 --> 00:07:59.720 Okay, here's another red flag. A female patient complains of 145 00:07:59.759 --> 00:08:04.319 mandibular paristhesia, a strange numbness in her lower jaw. Her 146 00:08:04.360 --> 00:08:07.120 medical history notes a previous diagnosis of breast cancer. 147 00:08:07.319 --> 00:08:11.879 That presentation requires immediate investigation for metastatic cancer. Breast, prostate 148 00:08:11.920 --> 00:08:15.680 and lung cancers frequently metastasized to the skeletal system, including 149 00:08:15.720 --> 00:08:16.839 the posterior. 150 00:08:16.399 --> 00:08:18.319 Mandible, and that causes the numbness. 151 00:08:18.600 --> 00:08:22.040 Yeah. As a metastatic lesion expands within the medullary space 152 00:08:22.120 --> 00:08:26.600 of the jawbone, it compresses the inferior alveolar nerve, causing 153 00:08:26.600 --> 00:08:28.160 that ipsilateral paristhesia. 154 00:08:28.600 --> 00:08:31.040 It really emphasizes the role of the dentist as a 155 00:08:31.079 --> 00:08:34.320 physician of the oral cavity, even when performing an extra 156 00:08:34.480 --> 00:08:37.840 head and neck exam. Culpating the lymph nodes provides another 157 00:08:37.919 --> 00:08:40.000 layer of systemic data. 158 00:08:40.080 --> 00:08:44.840 Definitely Differentiating an inflammatory response from a malignancy comes down 159 00:08:44.879 --> 00:08:48.919 to consistency and behavior. Inflammatory lymph nodes typically have a 160 00:08:49.000 --> 00:08:52.600 rapid onset, they're tender to palpation, and they remain freely 161 00:08:52.679 --> 00:08:54.480 movable within the tissue beds. 162 00:08:54.639 --> 00:08:56.679 But malignant nodes present very differently. 163 00:08:56.960 --> 00:09:02.080 Malignant limphitednopathy is insidious nodes tend to be indurated or hard, 164 00:09:02.559 --> 00:09:05.240 they become fixed to the underlying connective tissue or skin, 165 00:09:05.600 --> 00:09:08.879 and most dangerously, they are usually painless, and the. 166 00:09:08.919 --> 00:09:11.840 Lack of pain often delays patients from seeking care. So 167 00:09:11.879 --> 00:09:15.200 when a clinical exam reveals something suspicious and advanced imaging 168 00:09:15.320 --> 00:09:20.519 or testing is required, the concepts of diagnostic accuracy become critical. Specifically, 169 00:09:20.720 --> 00:09:23.480 the statistical measures of sensitivity and specificity. 170 00:09:23.759 --> 00:09:27.000 Right Sensitivity is the ability of a diagnostic test to 171 00:09:27.039 --> 00:09:30.279 correctly identify patients who actually have the disease in question. 172 00:09:30.960 --> 00:09:34.639 A highly sensitive test minimizes false negatives. 173 00:09:34.159 --> 00:09:36.879 Which is paramount when missing a diagnosis like an aggressive 174 00:09:36.879 --> 00:09:38.360 pathology could be fatal. 175 00:09:38.559 --> 00:09:41.480 Exactly, and specificity is the ability of a test to 176 00:09:41.519 --> 00:09:44.759 correctly identify those who do not have the disease. A 177 00:09:44.840 --> 00:09:49.399 highly specific test minimizes false positives, ensuring you don't subject 178 00:09:49.440 --> 00:09:53.120 a healthy patient to unnecessary, potentially harmful treatments. 179 00:09:53.559 --> 00:09:56.720 So applying that comprehensive diagnostic approach, if someone comes in 180 00:09:56.759 --> 00:10:00.200 complaining of halatosis, you know, bad breath, how much that 181 00:10:00.279 --> 00:10:03.200 is actually an oral problem versus a systemic gastro intestinal 182 00:10:03.399 --> 00:10:05.080 or respiratory issue. 183 00:10:04.759 --> 00:10:06.840 Well, it's easy to assume it is purely an oral 184 00:10:06.960 --> 00:10:10.960 hygiene issue. Local factors are certainly the primary culprit, specifically 185 00:10:11.320 --> 00:10:15.279 volatile sulfur compounds produced by gram negative anarebs residing in 186 00:10:15.320 --> 00:10:17.840 periodontal pockets or on the back of the tongue. 187 00:10:17.879 --> 00:10:22.200 But a thorough differential diagnosis must account for extraoral ideologies too. 188 00:10:22.279 --> 00:10:27.279 Right, Absolutely, uncontrolled diabetes can produce a characteristic ketoasidotic odor, 189 00:10:27.759 --> 00:10:33.120 chronic sinocitis, pulmonary diseases, or gastrontestinal reflux can all manifest 190 00:10:33.159 --> 00:10:37.440 primarily as halatosis. Treating the oral cavity and isolation without 191 00:10:37.519 --> 00:10:40.919 ruling out those systemic pathways is clinical negligence. 192 00:10:41.080 --> 00:10:45.200 Wow. But when systemic and local prevention fails, we observe. 193 00:10:45.279 --> 00:10:50.960 The three main pillars of dental pathogenesis take root caryology, periodontology, 194 00:10:51.080 --> 00:10:56.039 and endodontics. Starting with caryology, dental carries is fundamentally an infectious, 195 00:10:56.039 --> 00:10:59.279 communicable disease, and the mechanical breakdown of the tooth is 196 00:10:59.320 --> 00:11:00.759 governed by this Stefen curve. 197 00:11:01.320 --> 00:11:04.399 Right. The Steffen curve models the pH changes within dental 198 00:11:04.440 --> 00:11:08.960 plaque following the ingestion of fermentable carbohydrates. The caryogenic bacteria 199 00:11:09.039 --> 00:11:12.720 metabolize these carbs and excrete organic acids as a byproduct, and. 200 00:11:12.679 --> 00:11:15.039 The critical threshold for tooth enamel is a pH of 201 00:11:15.080 --> 00:11:15.840 five point five. 202 00:11:15.919 --> 00:11:18.840 Correct, that's the magic number. The moment the plaque environment 203 00:11:18.879 --> 00:11:22.080 drops below five point five, the hydroxy appetite crystals that 204 00:11:22.080 --> 00:11:24.840 make up the enamel begin to demineralize and dissolve into 205 00:11:24.879 --> 00:11:25.440 the saliva. 206 00:11:25.759 --> 00:11:28.799 This mechanism was famously demonstrated in the Wipeome study in 207 00:11:28.879 --> 00:11:32.440 nineteen fifty four. The researchers proved that the frequency of 208 00:11:32.440 --> 00:11:36.080 carbohydrate intake is vastly more destructive than the total absolute 209 00:11:36.120 --> 00:11:36.919 amount consumed. 210 00:11:37.080 --> 00:11:39.919 Yeah, that study is a corner stone of caryology. 211 00:11:40.000 --> 00:11:43.080 It's an amazing concept. So it's not about eating one 212 00:11:43.120 --> 00:11:46.519 giant boulder of sugar at dinner. It's about a continuous 213 00:11:46.639 --> 00:11:49.799 rain of sugar pebbles throughout the day, keeping your mouth 214 00:11:50.200 --> 00:11:51.720 in an acidic danger zone. 215 00:11:51.759 --> 00:11:54.639 I love that analogy. Eating a large quantity of sugar 216 00:11:54.720 --> 00:11:58.320 in a single sitting allows the salivary buffering capacity to 217 00:11:58.399 --> 00:12:02.360 eventually neutralize the acid, raise the pH above five point five, 218 00:12:02.639 --> 00:12:07.039 and initiate remineralization. But a continuous exposure, like sipping a 219 00:12:07.080 --> 00:12:10.360 sugary beverage all day, traps the oral environment in a 220 00:12:10.399 --> 00:12:12.399 perpetual state of demineralization. 221 00:12:12.639 --> 00:12:15.279 The saliva never gets the opportunity to recover the pH, 222 00:12:15.639 --> 00:12:18.399 which leads us to camber carries management by risk assessment. 223 00:12:18.799 --> 00:12:21.759 The profession has largely pivoted away from the strictly surgical 224 00:12:21.759 --> 00:12:25.480 model of simply amputating disease tooth structure and placing fillings. 225 00:12:25.799 --> 00:12:29.600 Right camera is a medical management model. It involves actively 226 00:12:29.639 --> 00:12:34.600 assessing pathologic factors like bacterial load and salivary dysfunction against 227 00:12:34.600 --> 00:12:39.039 protective factors like fluoride exposure, xylotol use, and salivary flow. 228 00:12:39.600 --> 00:12:43.639 The goal is to arrest the disease process before capitation even. 229 00:12:43.480 --> 00:12:47.720 Occurs, moving to the supporting structures. Period Ontology centers on 230 00:12:47.759 --> 00:12:51.159 the inflammatory destruction of the gums and alveolar bone and 231 00:12:51.200 --> 00:12:54.919 the shift in microbiological understanding here is critical. The non 232 00:12:54.960 --> 00:12:58.480 specific plaque hypothesis used to suggest that just an accumulation 233 00:12:58.559 --> 00:13:01.320 of any plaque caused periodontal disease. 234 00:13:01.159 --> 00:13:05.399 But the specific plaque hypothesis localize the etiology to specific 235 00:13:05.600 --> 00:13:08.919 highly virulent GRAM negative anaerobes often referred to as the 236 00:13:08.960 --> 00:13:10.799 Red complex bacteria. 237 00:13:10.399 --> 00:13:13.279 And the presence of those specific pathogens drives the host 238 00:13:13.279 --> 00:13:16.919 immune response to essentially destroy its own supporting bone just 239 00:13:16.960 --> 00:13:19.360 to keep the bacteria away from the systemic circulation. 240 00:13:19.679 --> 00:13:23.240 It's the body's scorched earth defense mechanism, and when assessing 241 00:13:23.240 --> 00:13:27.799 this destruction, clinically differentiating a pseudopocket from true clinical attachment 242 00:13:27.879 --> 00:13:29.159 loss is really necessary. 243 00:13:29.399 --> 00:13:32.639 A thudopocket is when the gingevil tissue becomes aedematist and 244 00:13:32.720 --> 00:13:36.759 hypertrophic due to inflammation swelling coronally. 245 00:13:36.240 --> 00:13:39.799 Over the tooth Exactly, the cecular depth increases, but the 246 00:13:39.840 --> 00:13:43.240 actual junctional epithelium has not migrated apically down the. 247 00:13:43.279 --> 00:13:46.879 Route, whereas true clinical attachment loss means the pathogenic process 248 00:13:47.159 --> 00:13:51.879 has actually destroyed the period ondoligament fibers and resorve the alveolar. 249 00:13:51.320 --> 00:13:54.480 Bone right and when that bone loss progresses between the 250 00:13:54.559 --> 00:13:59.360 divergent roots of multi rooted teeth, it creates a furcation involvement. 251 00:14:00.039 --> 00:14:02.799 This is classified as class one, two, or three based 252 00:14:02.799 --> 00:14:04.600 on horizontal penetration. 253 00:14:04.279 --> 00:14:07.080 And a class three furcation indicates the bone has been 254 00:14:07.120 --> 00:14:10.960 completely resorbed through the entire anatomical split of the roots. 255 00:14:10.679 --> 00:14:13.399 Right correct, it's a three and three defect, and when 256 00:14:13.480 --> 00:14:18.080 bacterial invasion bypasses the periodontm entirely and penetrates the pulp 257 00:14:18.159 --> 00:14:21.799 chamber directly, we enter the realm of endodontics. 258 00:14:21.360 --> 00:14:25.639 Where diagnostic testing has some pre significant physiological limitations. Like 259 00:14:25.679 --> 00:14:28.440 when a clinician applies an electric pulp tester or EPT 260 00:14:28.879 --> 00:14:31.639 to a tooth, it operates on a very basic premiss 261 00:14:31.759 --> 00:14:35.600 It introduces an electrical current to stimulate the adealta nerve fibers. 262 00:14:35.240 --> 00:14:38.159 Within the pulp, but a positive response only confirms that 263 00:14:38.200 --> 00:14:42.279 the nerve fibers are vital and capable of depolarization. It 264 00:14:42.320 --> 00:14:45.399 provides zero data regarding the vascularity. 265 00:14:44.799 --> 00:14:47.799 Of the pulp, and vascularity is the true determinant of 266 00:14:47.799 --> 00:14:48.799 pulple health, isn't it? 267 00:14:49.000 --> 00:14:53.320 Absolutely? A traumatized tooth might have its blood supply strangulated 268 00:14:53.320 --> 00:14:55.840 at the apical form and leading to a schemia and 269 00:14:55.919 --> 00:15:00.200 eventual necrosis. Yet the nerve fibers might temporarily continue you 270 00:15:00.240 --> 00:15:03.600 to conduct an electrical impulse, giving you a false positive 271 00:15:03.679 --> 00:15:04.320 on an EPT. 272 00:15:04.600 --> 00:15:08.240 Furthermore, percussion testing just tapping on the occlusal surface of 273 00:15:08.279 --> 00:15:12.960 the tooth evaluates a completely different anatomical structure. The dental 274 00:15:13.000 --> 00:15:17.320 pulp contains pain receptors, but lacks propriceptive fibers. The pulp 275 00:15:17.360 --> 00:15:19.120 has zero spatial awareness. 276 00:15:19.240 --> 00:15:22.000 Yeah, so when a tooth is percussed and elicits sharp pain, 277 00:15:22.159 --> 00:15:25.120 that response is actually generated by the propriate receptors within 278 00:15:25.159 --> 00:15:27.200 the peridontal ligament surrounding the root. 279 00:15:27.320 --> 00:15:30.759 Meaning the pulple infection has progressed periaptically and inflamed the 280 00:15:30.799 --> 00:15:34.399 surrounding ligament space. But disease is not the only pathway 281 00:15:34.440 --> 00:15:40.080 to structural failure. Acute trauma, particularly in pediatric populations, presents 282 00:15:40.159 --> 00:15:41.600 unique clinical challenges. 283 00:15:41.919 --> 00:15:45.919 Oh, for sure, there is a direct biomechanical correlation between 284 00:15:46.080 --> 00:15:50.440 orthodontic malclusions and traumatic injury. A patient presenting with an 285 00:15:50.440 --> 00:15:54.240 overjet a horizontal protrusion of the maxillaryan sizers greater than 286 00:15:54.240 --> 00:15:58.360 six millimeters is statistically four times more likely to sustain 287 00:15:58.399 --> 00:16:01.120 traumatic injuries to those in ati he your teeth. 288 00:16:01.039 --> 00:16:05.120 Because the anatomical protrusion prevents a competent lift seal. Without 289 00:16:05.120 --> 00:16:07.720 the soft tissue buffering of the upper and lower lips 290 00:16:07.720 --> 00:16:10.919 absorbing the kinetic energy of an impact, the brittle enamel 291 00:16:10.960 --> 00:16:13.240 of the incisors takes the full force of the blow. 292 00:16:13.519 --> 00:16:16.799 It's pure physics, and when that force results in an evulsion, 293 00:16:16.919 --> 00:16:19.360 the complete displacement of the tooth from its socket. The 294 00:16:19.399 --> 00:16:23.440 clinical protocol is dictated by cellular viability. 295 00:16:23.120 --> 00:16:26.919 Time is tissue. The critical window for reimplantation to achieve 296 00:16:26.960 --> 00:16:30.840 a favorable prognosis is approximately sixty minutes. But the splinting 297 00:16:30.879 --> 00:16:34.840 protocols following reimplantation reveal a fascinating biological nuance. 298 00:16:35.080 --> 00:16:38.159 Yeah. If a tooth sustains luxation where it is loosened 299 00:16:38.240 --> 00:16:41.000 but remains in the socket, it is typically splinted to 300 00:16:41.039 --> 00:16:44.120 adjacent teeth for up to three or four weeks, but an. 301 00:16:44.000 --> 00:16:47.960 Evulse tooth that is successfully reimplanted is only splinted for 302 00:16:48.000 --> 00:16:50.720 about two weeks. I have to push back on this 303 00:16:50.759 --> 00:16:54.000 splinting protocol though. If a tooth is completely knocked out, 304 00:16:54.039 --> 00:16:55.759 wouldn't you want to splint it for as long as 305 00:16:55.759 --> 00:16:58.399 possible to make sure it's secure. Why only two weeks. 306 00:16:58.559 --> 00:17:03.039 It seems counterintuitive, but prolonged rigid splinting of an avulse 307 00:17:03.120 --> 00:17:07.440 tooth fundamentally alters the cellular healing rechanism. The root surface 308 00:17:07.440 --> 00:17:12.359 relies on the repopulation of periodontal ligament fibroblasts to recreate 309 00:17:12.440 --> 00:17:17.559 that soft, suspensory cushion between the cementum and the alveolar bone. 310 00:17:17.599 --> 00:17:20.279 If the tooth is locked rigidly in place for too long, 311 00:17:20.599 --> 00:17:24.440 the body's osteoblasts outcompete the fibroblasts. 312 00:17:23.839 --> 00:17:26.319 Resulting in replacement resorption or ankylosis. 313 00:17:26.519 --> 00:17:30.400 Exactly, the osteoblasts fuse the alveolar bone directly to the 314 00:17:30.400 --> 00:17:34.319 cementum of the root, obliterating the peridontal ligament space entirely. 315 00:17:34.640 --> 00:17:38.240 An anklose tooth loses its physiological mobility, and. 316 00:17:38.200 --> 00:17:41.880 More importantly, in a growing pediatripatent, an ankylose tooth will 317 00:17:41.880 --> 00:17:45.319 fail to erupt vertically, with the surrounding alveolar ridge eventually 318 00:17:45.400 --> 00:17:47.319 becoming submerged and requiring extraction. 319 00:17:47.599 --> 00:17:52.000 Right so, a shorter, flexible splinting period allows for physiological 320 00:17:52.079 --> 00:17:57.000 micro movement, which specifically stimulates the PDL fibroblast to regenerate 321 00:17:57.359 --> 00:18:00.279 rather than signaling osteoblast to fuse the bone. 322 00:18:00.440 --> 00:18:04.200 Fascinating Now, when restoring damaged or decayed tooth structure, the 323 00:18:04.279 --> 00:18:08.720 overarching philosophy has undergone a massive paradigm shift. Historically, the 324 00:18:08.720 --> 00:18:14.319 profession adhered to GV Blacks principles, most notably extension for prevention. Yeah. 325 00:18:14.400 --> 00:18:18.119 That doctrine mandated the surgical removal of significant amounts of healthy, 326 00:18:18.200 --> 00:18:22.240 unaffected enamel and dentin to extend the restorative margins into 327 00:18:22.279 --> 00:18:24.119 areas deemed self cleansing. 328 00:18:23.720 --> 00:18:27.200 To prevent secondary carries. But it was a highly destructive 329 00:18:27.200 --> 00:18:31.440 philosophy based on the limitations of early restorative materials. The 330 00:18:31.519 --> 00:18:35.440 advent of adhesive dentistry ushered in the era of microdentistry. 331 00:18:35.799 --> 00:18:39.880 The modern imperative is extreme conservation of tooth structure. Clinicians 332 00:18:39.920 --> 00:18:44.799 remove only the infected structurally compromised tissue. Because modern composite 333 00:18:44.799 --> 00:18:48.440 resins bond micromechanically to the enamel and dentin, there's no 334 00:18:48.480 --> 00:18:51.759 longer a need to cut complex geometric or attentive features 335 00:18:51.759 --> 00:18:52.960 into healthy tooth structure. 336 00:18:53.119 --> 00:18:56.920 But despite the dominance of esthetic composite resins, the clinical 337 00:18:56.960 --> 00:19:01.519 literature heavily defends the continued utility of traditional materials like 338 00:19:01.680 --> 00:19:03.839 dental amalgam and guttapercha right. 339 00:19:03.920 --> 00:19:08.519 Oh. Absolutely, composites are incredibly technique sensitive. They require absolute 340 00:19:08.519 --> 00:19:13.240 moisture control. In deep subgingible preparations where isolation is impossible, 341 00:19:13.519 --> 00:19:17.359 placing a hydrophobic composite resin will result in immediate bond 342 00:19:17.359 --> 00:19:19.160 failure and recurrent decay. 343 00:19:19.480 --> 00:19:24.480 While amalgam, despite the esthetic drawbacks, remains highly durable, self 344 00:19:24.480 --> 00:19:29.359 sealing and clinically appropriate in those challenging posterior scenarios. Every 345 00:19:29.359 --> 00:19:32.799 localized clinical decision we have discussed, from managing anxiety to 346 00:19:32.839 --> 00:19:36.319 selecting a restorative material, operates within a macro framework of 347 00:19:36.359 --> 00:19:37.519 ethics and public. 348 00:19:37.240 --> 00:19:39.640 Health, and the public health domain of dentistry has a 349 00:19:39.680 --> 00:19:43.640 particularly compelling origin story centered on water fluoridation yes. 350 00:19:44.079 --> 00:19:47.279 In the early twentieth century, doctor Frederick McKay investigated a 351 00:19:47.279 --> 00:19:51.319 phenomenon in certain Colorado communities characterized by severe dark brown 352 00:19:51.400 --> 00:19:53.680 staining of the anmyl known as the Colorado brown stain. 353 00:19:53.920 --> 00:19:58.160 The clinical paradox was that these severely discolored teeth demonstrated 354 00:19:58.200 --> 00:20:02.359 a near total immunity to dental care. The etiology was 355 00:20:02.359 --> 00:20:06.440 eventually traced to naturally occurring exceptionally high levels of fluoride 356 00:20:06.480 --> 00:20:07.640 in the local water supply. 357 00:20:08.000 --> 00:20:12.240 The excessive fluoride ingestion during tooth development caused fluorosis the 358 00:20:12.240 --> 00:20:15.920 structural modeling and staining of the enamel, but it also 359 00:20:16.000 --> 00:20:19.279 resulted in the systemic incorporation of fluor appetite into the 360 00:20:19.279 --> 00:20:21.200 crystalline structure of the teeth. 361 00:20:21.160 --> 00:20:25.240 Which is vastly more resistant to acid dissolution than naturally 362 00:20:25.279 --> 00:20:27.480 occurring hydroxy appetite, and. 363 00:20:27.440 --> 00:20:30.279 This observation led to the controlled adjustment of fluoride levels 364 00:20:30.279 --> 00:20:34.519 and municipal water supplies, optimizing the carries preventive benefits while 365 00:20:34.559 --> 00:20:38.599 keeping the concentration low enough to avoid fluorosis. Guiding these 366 00:20:38.599 --> 00:20:42.640 broader public health initiatives and every individual patient interaction is 367 00:20:42.680 --> 00:20:43.559 the code of ethics. 368 00:20:43.839 --> 00:20:48.559 The profession is governed by five foundational principles beneficence doing good, 369 00:20:49.119 --> 00:20:53.880 autonomy respecting the patient's right to self determination, justice, demanding fairness, 370 00:20:54.160 --> 00:20:57.160 non mollificence, the core directive to do no harm, and 371 00:20:57.240 --> 00:21:00.319 veracity truthfulness in the doctor patient relationship, and. 372 00:21:00.200 --> 00:21:04.920 These principles frequently intersect and conflict in clinical practice. Consider 373 00:21:04.960 --> 00:21:08.480 a classic ethical dilemma from the text a healthy twenty 374 00:21:08.559 --> 00:21:13.119 nine year old patient presents with minor, easily restorable cavities. However, 375 00:21:13.519 --> 00:21:17.279 they express deep frustration with oral hygiene and demand the 376 00:21:17.319 --> 00:21:19.880 extraction of all the remaining teeth to be fitted for 377 00:21:19.960 --> 00:21:21.480 full removable dentures. 378 00:21:21.599 --> 00:21:23.640 It happens more often than you'd think, so the. 379 00:21:23.599 --> 00:21:26.960 Patient is fully informed and adamant. Doesn't the principle of 380 00:21:27.000 --> 00:21:29.240 autonomy mean you have to do what they ask because 381 00:21:29.240 --> 00:21:31.440 they have the right to dictate what happens to their body. 382 00:21:31.559 --> 00:21:34.480 It does not. The principle of autonomy is not absolute 383 00:21:34.519 --> 00:21:38.720 when it conflicts directly with non molificence. A practitioner's authority 384 00:21:38.720 --> 00:21:42.000 and license are predicated on clinical expertise and adherence to 385 00:21:42.039 --> 00:21:42.960 a standard of care. 386 00:21:43.119 --> 00:21:45.519 You can't just take out healthy organs on demand, right. 387 00:21:45.960 --> 00:21:49.400 No clinician is ethically or legally obligated to perform a 388 00:21:49.440 --> 00:21:53.599 procedure that falls below the standard of care or inflicts unnecessary, 389 00:21:53.759 --> 00:21:59.240 irreversible anatomical harm. Extracting a fully functional, restorable dentition to 390 00:21:59.279 --> 00:22:02.400 solve minor and localized disease is a gross violation of 391 00:22:02.480 --> 00:22:05.839 do no harm. The clinician must refuse the treatment, but. 392 00:22:05.839 --> 00:22:09.160 If that refusal causes an irreconcilable breakdown of the doctor 393 00:22:09.160 --> 00:22:12.839 patient relationship. The clinician cannot simply dismiss the patient on 394 00:22:12.880 --> 00:22:17.200 the spot. Terminating the relationship requires strict adherence to legal 395 00:22:17.200 --> 00:22:20.240 protocols To avoid allegations of abandonment right. 396 00:22:20.319 --> 00:22:24.559 Correct, the clinician must provide written notice of termination, remain 397 00:22:24.599 --> 00:22:28.000 available to treat dental emergencies for a reasonable period usually 398 00:22:28.039 --> 00:22:31.720 thirty days, and provide the patient with resources or referrals 399 00:22:31.720 --> 00:22:33.160 to secure alternative care. 400 00:22:33.680 --> 00:22:37.000 The ethical and legal obligations to safeguard the patient's health 401 00:22:37.200 --> 00:22:41.079