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Dental Facts
NBDE 1
Question | Answer |
---|---|
1. Primary tooth that has the most distinct prominent facial cervical ridge | Mandibular 1st molar |
2. Lingual cusp of the Maxillary first premolars is off set to the mesial than the second? | Yes |
3. Primary second molar generally exhibit what cusp? | Cusp of carabelli |
4. Mamelons that remain beyond the age of 10 generally indicate what type of bite? | Open bite |
5. Mand central incisors and Max third molars generally occlude w/ how many apposing teeth? | One |
6. What developmental groove between the df cusp and dl cusp of mand 1st molar? | Distofacial groove |
7. The roots of the maxillary second molar tent to be ___ ____ and have ____ _____ inclinations. | less divergent; greater distal |
8. What teeth has a primary function of biting? | Incisors and canines |
9. The tooth with the longest root. | Maxillary canine |
10. What is the groove pattern for the mandibular first molar? | Y or Dryopethicus pattern |
11. What is the groove patter for the mandibular second molar? | Cross (+) pattern |
12. When compared to a maxillary canine the mandibular canine has contact areas located more ______. | Incisally |
13. The mandibular 1st premolar, the mesial marginal ridge is located more _____ than the distal marginal ridge. | Cervically |
14. The oblique ridge of the maxillary molar forms the ______ _______ of the central fossa. | distal boundary |
15. The transverse ridge results from what two union? | facial and lingual triangular ridges |
16. For multirooted teeth dentin continues to form MOST rapidly at the ______ and ______ triangular ridges | facial; lingual |
17. What anterior teeth are wider mesio-distally than facio-lingually? | Maxillary incisors |
18. What posterior teeth are wider mesio-distally than facio-lingually? | Mandibular molars |
19. Mandibular 1st molars usually have _____ roots and ______ canals? | two; three |
20 How many mesial canals are in mandibular 1st molars | two mesial canals |
21. What primary tooth generally has an oblique ridge? | Primary maxillary 2nd molar |
22. The mesiolingual cusp of the maxillary molars occlude in the ______ _______ of the mandibular molar. | central fossa |
23. The distobuccal cusp of the mandibular molars occlude in the ____ _____ of the maxillary molar. | central fossa |
24. The primary second molar exhibit more/less cusps than the primary first molar. | more |
25. The occlusal outline of a mandibular first molar is what shape? | Pentagon |
26. What is the greatest influence for the lingual concavity of the maxillary anterior teeth? | By the side shift of the mandible |
27. The side shift of the mandible is also known as the ________ ________. | Bennett movement |
28. The contact between a max central and lateral incisor makes the lingual embrasure ______ than the facial embrasure. | larger |
29. What non-molar tooth most frequently has a mesial and distal pulp horn? | Max central incisor |
30. The cervical ridge is the most prominent for ______ maxillary teeth on the MF surface of the 1st molar. | primary |
31. What is the movement of the non-working condyle? | down, forward, and medially |
32. What non-molar tooth most frequently exhibits three roots? | maxillary 1st premolar |
33. Where is the dentin most highly mineralized? | intra or peritubular dentin |
34. The primary spacing for the anterior teeth is most frequently caused by growth of the _____ _______. | dental arches |
35. What tooth is the only tooth that has the potential of contacting both anterior and posterior teeth? | Max canine |
36. The mesiofacial and distolingual angle form the occlusal outline tend to be ______ angles. | acute |
37. this mesiolingual and distofacial angles form the occlusal outline tend to be ______ angles. | obtuse |
38. The ______ corners coincide w/ the direction of the oblique ridge. | obtuse |
39. The occlusal outline from an occlusal view of the maxillary first molar is _______. | rhomboidal |
40. How many teeth in the permanent dentition normally have cingulums? | 12 (max & mand anteriors) |
41. What anterior tooth most frequently exhibit a bifurcated root? | mandibular canine |
42. The bifurcation for the mandibular canine roots when present creates a ______ and ______ root. | facial; lingual |
43. The cross section of the mandibular canine at the CEJ is _____ but wider _______ at the labial. | ovoid; mesiodistally |
44. The non-molar that is least likely to have a bifurcated root is what? | maxillary central incisor |
45. The size and position of the cusps are more identical for the maxillary 1st or 2nd premolar? | maxillary 2nd premolar |
46. What tooth has the most pronounced developmental marginal groove of any of the max teeth? | max 1st premolar |
47. The Y type mandibular premolar has ____ facial and ____ lingual cusps. | one; two |
48. What central incisor is the most bilaterally symmetrical tooth? | primary and permanent mandibular central incisor |
49. The maxillary _______ ________ generally have the most prominent marginal ridges of all anterior teeth. | lateral incisors |
50. Maxillary ______ _________ have the most distinct and deepest lingual fossa's of all anterior teeth. | lateral incisors |
51. Which posterior tooth has the greatest cervico-occlusal crown height? | Maxillary 1st premolar |
52. What cusps does the oblique ridge connect? | mesiolingual and distofacial cusps. |
53. The occlusal outline for the mandibular 1st premolar occlusal view is ______ shaped. | diamond |
54. The last primary teeth to erupt in the maxillary is what? | second molars |
55. The softest dental tissue is _____. | cementum |
56. The hardest dental tissue is _____. | enamel |
57. T/F All premolars are wider faciolingually than mesiodistally. | True |
58. T/F Maxillary 2nd premolars has 2 cusps that are equal in height. | True |
59. What are the boarders of the TMJ? | space between the disc, articular fossa, and eminence. |
60. Where is the 4th pulp canal in the maxillary first molar is located where? | mesiofacial canal |
61. What is the shape of the crown of canines from a facial view? | pentagonal |
62. The proximal contacts of the mandibular central incisors are located where? | approximately at the same level as the mesial and distal incisal thirds. |
63. On the maxillary 1st premolar, what concavity makes it difficult to adapt a matrix band around? | mesial concavity. |
64. Viewed from the occlusal the arrangement of the teeth are ______ shaped. | parabolic |
65. Viewed from he occlusal the 4 posterior teeth in the mandibular arch are aligned in a _____ ________. | straight line |
66. ________ ____ molar is the only primary posterior tooth to have oblique & transverse ridges & DL grooves. | Primary 2nd molar |
67. The thickest section of the articular disc when seen in the sagittal plane is the _________ _____________. | posterior border |
68. Except for third molars the ____________ _________ _________ exhibit the most deviation in the crown morphology. | maxillary lateral incisor |
69. What fibers of the periodontal ligament provide the major support for a tooth during function? | oblique fibers |
70. The largest root of the maxillary molar is the ________ ________. | palatal root. |
71. The smallest root of the maxillary molar is the ___________ ___________. | distofacial root |
72. The pulp chamber of a mature tooth contains _______ ______ and _______. | blood vessels; nerves |
73. The mandibular primary primate space is located between _______ and _______. | canie; first molar |
74. The occlusal table of a posterior tooth makes up _______ of the total facio-lingual dimension. | 55-65% |
75. In a healthy mouth the alveolar process is ______ around the facial of the mandibular central incisors. | thinnest |
76. The crown of the mandibular second molar inclines to the ______ and ______. | mesial; lingual |
77. T/F the epithelial attachment is always an actual part of a tooth's periodontium. | True |
78. Continued eruption of a tooth through the surrounding tissue makes the clinical crown appear _____. | longer |
79. The _____ ____ primary molar has a crown that somewhat resembles a permanent molar. | maxillary first |
80. The _____ _____ primary molar has a root that resembles a typical permanent molar. | maxillary first |
81. ______ guidance plays the greatest role in disoccluding the posterior teeth in latero-protrusive movements. | anterior guidance. |
82. Viewed form the occlusal the basic coronal outline of a mandibular second premolar is _____. | pentagonal |
83. Ligaments associated with the TMJ serve to ______ surrounding and ________ tissues from damage. | protect; supporting |
84. Facial view of a primary mandibular 1st molar, the CEJ is most ______ positioned towards the ______ _______. | apically; mesial 1/3 |
85. The ______ ___ _______ has the greatest M-D diameter of all the molars. | mandibular 1st molar |
86. Other than 3rd molars the tooth that is most often congenitally missing what teeth? | maxillary lateral incisors |
87. The M-D width of the mandibular lateral incisor is ______ than the mandibular central incisor. | wider |
88. The M-D width of the maxillary lateral incisor is _____ than the maxillary central incisor. | narrower |
89. The key feature that differentiates the mandibular 1st & 2nd molar is the number of _______ ________ and _______ _______. | developmental grooves; number of cusps |
90. The incisal embrasure between the maxillary centrals is _____ than between the central and the lateral. | smaller |
91. The premolar that has a longer mesio-facial cusp ridge than the disto-facial cusp ridge is the ______ _____. | maxillary 1st premolar |
92. The facial cusp of the maxillary 1st premolar is offset to the _____. | distal |
93. A common trait of the maxillary premolar is that their lingual cusp are offset to the ____. | mesial |
94. For molar teeth the root canals join the pulp chamber _____ to the CEJ. | apical |
95. The _____ periodontal fibers travel from one root to the adjacent root surface. | transseptal |
96. In the rare event of a second canal of a mandibular 1st premolar it is most likely located to the _______. | lingual |
97. The mesiolingual developmental groove on tooth #21 originates from the ______ ____. | occlusal pit |
98. The mesiolingual developmental groove on #21 extends onto the _____ _____. | proximal surface |
99. The physiologic rest position is established when? | the mastication muscles are in the tonic equilibrium |
100. The overjet and overbite provide some degree of _____ for lips, cheek and tongue. | protection |
101. The ____ _______ of an anterior tooth is the first to calcify. | incisal ridge |
102. A crown of the maxillary first molar has a _____ _______ groove than the second molar. | shorter distolingual |
103. The principle muscles that retrude the mandible are the ______ _____ of the temporalis. | posterior fibers |
104. ________ is an excess of calcified tissue formation of the root apex. | hypercementosis |
105. At the mid root cross section of first molars the largest is the ____ of the mandibular. | mesial |
106. The premolar with the steepest cusp inclines is what tooth? | maxillary 1st premolar |
107. The primary mandibular 1st molar usually exhibit a distal _____ _____. | triangular fossa |
108. The maxillary lateral incisor is usually equal to or larger than the maxillary central in ______ length. | root |
109. The distoincisal angle of the maxillary lateral has the greatest ______ of all maxillary anterior teeth. | convexity |
110. The geometric form of anterior teeth when viewed from the proximal is _____. | triangular |
111. The ________ cusp of maxillary is the only one that is not part of the molar cusp triangle. | distolingual |
112. The mandibular central incisors have contact points at the same ______ level. | incisocervical |
113. Mandibular molar have long axis of their root apices _____ and their crowns _____. | facial; lingual |
114. Caries stimulate the production of ______ dentin. | secondary |
115. The largest cusp of the mandibular first molar is the _____. | mesio-facial |
116. In cervical cross section the root of the mandibular canine is flattened in a ________ direction. | mesio-distal |
117. The primary central incisor exhibit a cervical ridge where? | both facial and lingual surfaces. |
118. What type of connective tissue is the periodontal ligament fibers made of? | Collagen |
119. The mandibular 1st premolar as a uniquely prominent _____ ridge. | triangular |
120. The mandibular 1st premolar has frequently both a _____ and _____ pit. | mesial; distal |
121. The temporomandibular ligament _____ the extant of jaw opening. | limit |
122. The temporomandibular ligament _____ translation of the condyle down the articular eminence. | initiates |
123. The tooth that is most likely forced into the maxillary sinus during an extraction is the ____ _____. | first molar |
124. The ______ muscle is an extrinsic muscle of the tongue that causes it to retract. | styloglossus |
125. Facial view, the apex of the lingual root is in line with the _____ groove of the tooth. | facial |
126. The premolar that is likely to have a crescent-shaped central developmental groove is _______ _______. | Mandibular 2nd |
127. The maxillary 3rd molar is the molar that most frequently have __ cusps. | 3 |
128. Mesolingual groove is an identifying characteristic for the ______ ____ premolar. | mandibular 1st |
129. ______ movement occurs during the earliest stage of lateral movement. | Bennett movement |
130. The ______ ______ muscles are primarily responsible for protrusive movement. | lateral pterygoid |
131. The lingual cusp of the mandibular first premolar is approximately ____ the height of the facial cusp. | 2/3rd |
132. The first succedaneous tooth to erupt in the mouth is what tooth. | permanent mandibular central incisor |
133. The Y type mandibular 2nd premolar has the same number of _____ ____ as the mandibular 1 molar. | occlusal pits |
134. From the facial or lingual views, canines have a _____ outline. | pentagonal |
135. The maxillary 1st molar has a ______ concavity that can pose special problems in matrix placement. | distal concavity |
136. The cervical cross section of the maxillary 1st premolar exhibits a _____ shaped root outline. | kidney |
137.The cervical cross section of the maxillary 1st premolar exhibits a _____ shaped pulp chamber floor. | kidney |
138. The middle facial lobe of the of the maxillary canine includes the ____ ____. | cusp tip |
139. The number of lobes that form the anterior teeth is ____. | 4 |
140. The number of lobes tht form the posterior teeth coincides with what? | coincides the number of cusps |
141. The _____ __ ______ is the anterior-posterior curvature of the occlusal surfaces as seen in a facial view. | curve of spee |
142. The _____ periodontal ligament fibers reduces the likelihood of forceful impaction into the alveolus. | oblique |
143. The height of contour is the ______ ____ for the facial surfaces of all teeth. | gingival 1/3 |
144. The apex of the triangular-shaped boundary of the interproximal spaces is the _____ ____ of the teeth. | contact area |
145. From a facial view the crown of a primary canine has a mesio-incisal slope ____ than the disto-incisal slope. | longer |
146. The cusp tip of the primary canine is generally offset to the _____. | distal |
147. A primary molar lacks an identifiable _____ _____. | root trunk |
148. The maxillary canine from a proximal view tends to be positioned with the most nearly ____ axis. | vertical |
149. ______ is the cemental union of 2 fully formed teeth that were originally separate entities. | concrescence |
150. The apex of a tooth is fully formed ____ years after it erupts in the mouth. | 2-3 yrs |
151. The ____ _____ _____ muscle is the prime mover in effecting a left working movement. | right lateral pterygoid |
152. The mesial surface of a crown of a mandibular canine is almost _____ to the long axis of the tooth. | parallel |
153. The smallest cusp of the mandibular 1st molar is what? | distal cusp |
154. The cross sectional outline at the cervical is roughly ____ for the permanent maxillary 2nd molar. | triangular |
155. The TMJ has how many synovial cavities? | 2 |
156. The cervical line of permanent teeth has the greatest depth of curvature on the ____ aspect. | mesial |
157. From a proximal view, the incisal ridge of the crown is in line with the ____ of the root. | center |
158. What primary tooth has the smallest faciolingual crown dimension? | mandibular central incisor |
159. The primary mandibular first molar has the most distinct ______ ridge. | transverse |
160. The condyle on the working side generally rotates about the _______ ______ and _______ laterally. | vertical axis; translates |
161. Occlusal view, the greatest faciolingual diameter of a mandibular 2nd molar is the ____ _____. | mesial 1/3 |
162. More of the occlusal surface can be seen from the _____ than the _____ for a mandibular 1st premolar. | mesial; distal |
163. The _____ movement is the bodily shift of the mandible towards the working condyle. | Bennett |
164. The DL groove of a maxillary lateral incisor is an anatomical feature that complicates ____ _____ | root planning. |
165. _____ are a result of normal enamel apposition. | perikymata |
166. _____ periodontal ligament fibers are most likely to be found in the middle 1/3 of the root. | oblique |
167. The mandibular centrals and laterals most frequently have _____ areas on the M & D root surfaces. | concave |
168. The mandibular canine has a _____ prominent cingulum than the maxillary canine. | less |
169. The mandibular canine has a ______ ______ facial surface from incisal to apical end. | continuous convex |
170. Accessory pulp canals may be found in the ____ ____ of the root. | cervical 1/3 |
171. Accessory pulp canals may contain ____ and ____ tissue. | nervous; vascular |
172. Accessory pulp canals may be found in _____ area of molars. | furcation |
173. Accessory pulp canals allow the pulp tissue to _____ with the periodontal ligament space. | communicate |
174. The TMJ is protected by what? | synovial fluid, fibrocartilage, ligament suspension, and masticatory muscles |
175. The most prone facial and lingual surfaces of molars are the _____ of ______ and the ______ of _____ | lingual of maxillary; facial of mandibular |
176. The function of the pulp? | form & supply nutrients to dentin and transmit sensory stimuli |
177. In delayed resorption of primary incisors the permanent incisors usually erupt _____. | lingually |
178. The disk of the TMJ is moved forward principally by the ____ _____ muscle. | lateral pterygoid |
179. Primary molars differs from permanent molars in that their roots are more _____. | dvergent |
180. The primary teeth that differ most from permanent teeth are the ____ _____. | first molars |
181. The highest and sharpest cusp on a primary mandibular first molar is the _____ cusp. | mesiolingual |
182. The maxillary central has the greatest _____ axial inclination. | facio-lingual |
183. The primary function of the dental pulp is to form _____. | dentin |
184. The shortest interdental papilla is between the ______ ______ ______and ______ _______. | mandibular second premolar; first molar |
185. In cross section the root of the mandibular canine is regularly ____. | oval |
186. The percentage of dentin that is organic is ____. | 20-30% |
187. The anterior tooth that is most likely demonstrate a lingual pit cavity is ______ _____ _______. | maxillary lateral incisor. |
188. Calcification of the primary root is normally completed at _____ of age. | 3-4 yrs |
189. _______ fibers are not periodontal fibers. | interradicular |
190. Approximately ____ of permanent root formation is completed at the time the tooth erupts. | 50% |
191. The ______ ______ ______ has the greatest faciolingual diameter of the crown for all teeth. | maxillary first molar |
192. Tooth contact almost exclusively determines ______ position. | intercuspal |
193. _______ ______ position is a muscle guide position. | physiological rest |
194. ______ ______ is a ligament guided position. | centric relation |
195. Centric occlusion = ________ = _________. | CO; intercuspal position |
196. The ideal position and height of lingual cuss of Mand 1st molar accommodates _____ ______. | working movement. |
197. What tooth has the longest root. | maxillary canine |
198. The premolar that most frequently has a single central pit is the ____ ____. | mandibular second. |
199. What does developmental grooves separate? | separates cusp ridges from marginal ridges |
200. The _______ _______ ______ most often is in abnormal relation and contact with adjacent teeth. | maxillary lateral incisor |
201. The lingual cusp of a mand 1st premolar is similar in development to the cingulum of a _____. | canine |
202. Teeth are in contact in intercuspal position during ____ masticatory swallowing. | NON |
203. Contraction of the lateral pterygoid produces what type of movement to the condyle? | forward movement of the condyle from the articular fossa |
204. The maxillary 1st molar has a wider m-d width(taper) towards the ____ than towards the _____. | facial; lingual |
205. Physiological rest position is also known as what? | postural position |
206. The primary maxillary 1st molar most often bears the greatest resemblance to a ____. | premolar |
207. In Posselt's envelope of motion _____ ____ position is the most superior point. | maximum intercuspal |
208. The molar that has the most distinct transverse ridge separating the mesial fossa is the ____ _____ | mandibular 1st |
209. The ____ _____ is a depression in the temporal bone, just anterior to the auditory canal. | glenoid fossa |
210. The center of the oblique ridge on a maxillary 1st molar is at the same level as what? | the marginal ridge |
210. _____ is a developmental abnormality characterized by the presence of fewer teeth than usual. | oligodontia |
211. Tooth # ___ & ____ are the non molar teeth having the sharpest demarcation between pulp chamber & canal. | 5; 12 |
212. Dense ____ ___ ____ tissue covers the articulating osseous structures of the tmj. | avascular fibrous connective |
213. The mandibular first premolar is the only premolar that frequently has ____ pulp horn. | one |
214. The facial surfaces of mandibular molars are located ____ to the border of the ascending ramus. | medial |
215. The facial masticatory mucosa (attached gingiva) is narrowest where? | mandibular first premolar |
216. The DEJ occurs at the junction of where? | dental papilla & inner enamel pithelium |
217. Of the 3 furcations of maxillary 1st molar the ____ is the closest to the cervical line. | mesial |
218. Of the 3 furcations of a maxillary 1st molar the ____ is the furthest form the cervical line. | distal |
219. The ____ _____ muscle is NOT an elevator of the mandible. | lateral pterygoid |
220. Maintenance of the epithelial attachment (IS/IS NOT) a function of the periodontal ligament. | IS NOT |
221. Periodontal ligament fibers are made up of what? | collagen |
222. Periodontal ligament fibers support the tooth connecting to the dental alveolar bone via the _____. | cementum |
223. Does the primary first mandibular molar look like any permanent tooth? | NO |
224. What tooth have the greatest morphological variation and what is second to that? | 3rd molars, maxillary laterals are second. |
225. Maxillary 3rd molars from an occlusal view look like a heart shape because they are missing what? | distolingual cusp |
226. Mandibular centrals distinguished by the ____ ____, which is greater on the ____ than _____. | cervical curvature; mesial; distal |
227. Marginal ridge height for posterior teeth are generally ____ occlusal than the _____. | more; distal |
228. Mandibular first premolar has its mesial marginal ridge compared to the distal. | cervical |
229. Supernumerary teeth when seen in the maxillary are usually found where? | between centrals or as 4th molars |
230. The main component of enamel is what? | inorganic matter (NOT collagen) |
231. The direction of primary enamel rods in the cervical third is in what direction. | occlusal direction. |
232. The direction of enamel rods in the permanent teeth in the cervical third is in what direction. | gingival direction |
233. The lower compartment of the tmj is located where? | between the condyle and the disc |
234. Primary teeth appear more worn compared to permanent teeth because of what reason? | less mineralized |
235. What is the usual overjet? | 2-4 mm |
236. Difference in space from primary to the permanent dentition. | 2-4 mm |
237. All teeth have ____ and _____ marginal ridges. | distal; mesial |
238. Does the lingual cusp of the mandibular 1 premolar in normal occlusion occlude? | No |
239. Physiological rest position occurs when? | when the muscles of mastication are in a tonic equilibrium |
240. What is the movement of the condyle when the mandible moves from CO to edge to edge? | down and forward |
241. What has the greatest m-d crown dimention of any anterior teeth? | maxillary centrals |
242. T/F Max central does not have nearly identical M-D vs. I-C length. | F |
243. What has the greatest cervical curvature (mesial) of any other tooth? | Max central |
244. What teeth has the smallest m-d width of any maxillary teeth? | max lateral |
245. What has the most crown shape variation? | max lateral |
246. Of all anterior teeth, what has nearly identical m-d & facio-lingual measurement? | max lateral |
247. Of the incisors, what tooth has a distal contact that is farthest cervically? | max lateral |
248. What has the smallest crown dimensions of any tooth? | mand centrals |
249. What has the most symmetrical crown? | mand centrals |
250. What teeth has proximal contacts at the same level? | mand centrals |
251. Crown twisted on root. | mand lateral |
252. Greatest overall tooth length | max canine |
253. What canine has a distal bulge? | max canine |
254. Greatest f-l crown dimension of any anterior tooth | max canine |
255. Tooth with cusp tip located facial to lingual axis | max canine |
256. Greatest cervical prominence of any anterior tooth | max canine |
257. Max canine has distal contact where? | centered |
258. What has the straightest mesial alignment of crown to root? | mand canine |
259. Mand canine makes a ____ shape from crown tip to root apex | C shape |
260. Mad canine has incisal edge ____ to long axis | lingual |
261. Longest root of any mandibular teeth | mandibular canine |
262. Max 1st premolar only premolar with longer _____ _____ cusp ridge. | mesial cusp |
263. Max 1st premolar only tooth with _____ _____ ridge groove and _____ ____ concavity and _____ root depression. | mesial marginal; mesial crown; mesial |
264. ____ ____ premolar most symmetrical posterior tooth | max 2nd |
265. What tooth has the shortest root of any mandibular tooth? | mand 3rd |
266. What tooth has the greatest distal root inclination of any other tooth? | mand 3rd |
267. Cruxiform occlusal pattern | mand 2nd molar |
268. Molar mesial root has the greatest f-l dimension of any other root | mand 1st |
269. Only premolar with a central fossa | mand 2nd |
270. Molar has the greatest root separation of any other tooth | mand 1st |
271. Only premolar with lingual groove | mand 2nd |
272. Molar with the longest root of any other molar | mand 1s |
273. Only premolar with multiple lingual cusps | mand 2nd |
274. molar has three facial cusps | mand 1st |
275. Premolar has mesial marginal ridge that is more cervical than distal marginal ridge | mand 1st |
276. Largest O-C crown dimension of any mand molar | mand 1st |
277. Only premolar with a m-l groove | mand 1st |
278. Largest f-l crown dimension of any other mand tooth | mand 1st |
279. premolar with most variation of all posterior teeth in facial vs lingual cusp height | mand 1st |
280. Closest in size f-l vs m-d of any max posterior tooth | max 1st molar |
281. Smallest f-l of any posterior tooth | mand 1st premolar |