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93. Another key feature that differentiates a mandibular1st & 2nd molar is the number of cusps 94. The incisal embrasure between the maxillary centrals is smaller than between the central and the lateral 95. The premolar that has a longer mesio-facial cusp ridge than disto-facial cusp ridge is the maxillary 1st 96. The facial cusp of the maxillary 1st premolar is offset to the distal 97. A common trait of maxillary premolars is that their lingual cusps are off set to the mesial 98. For molar teeth the root canals join the pulp chamber apical to the cementoenamel junction 99. The transseptal periodontal fibers travel from one root to an adjacent root surface 100. The usually pattern of eruption for primary teeth is centrals, laterals,1st molars, canines, 2nd molars 101. In the rare event of a second canal for a mandibular 1st premolar it is most likely located to the lingual 102. The mesiolingual developmental groove on tooth # 21 originates from the occlusal pit
103. The mesiolingual developmental groove on tooth # 21 extends onto the proximal surface 104. The physiologic rest position is established when the mastication muscles are in tonic equilibrium 105. The overjet and overbite provide some degree of protection for lips, cheeks and tongue 106. The incisal ridge of an anterior tooth is the first to calcify 107. A crown of the maxillary first molar has a shorter distolingual groove than the second molar 108. The principle muscles that retrude the mandible are the posterior fibers of the temporalis 109. Hypercementosis is an excess of calcified tissue formation at the root apex 111. The premolar with the steepest cusp inclines is the maxillary 1st premolar 112. The primary mandibular 1st molar usually exhibits a distal triangular fossa 113. The maxillary lateral incisor is usually equal to or larger than the maxillary central in root length 114. The distoincisal angle of the maxillary lateral has the greatest convexity of all maxillary anterior teeth 115. The geometric form of anterior teeth when viewed from the proximal is triangular 116. The distolingual cusp of maxillary molar is the only one that is not part of the molar cusp triangle 117. The mandibular central incisors have contact points at the same incisocervical level 118. Mandibular molars have long axis of their root apices facial and their crowns lingual 119. Caries stimulates the production of secondary dentin
120. The largest cusp of the mandibular first molar is the mesio-facial 121. In cervical cross section the root of the mandibular canine is flattened in a mesio-distal direction 122. The primary central incisor exhibits a prominent cervical ridge both on the facial and lingual surfaces 123. Collagenous is the predominant connective tissue for periodontal ligament fibers 124. The mandibular 1st premolar has a uniquely prominent triangular ridge 125. The mandibular 1st premolar has frequently both a separate mesial and distal pit 126. The temporomandibular ligament limits the extent of jaw opening 127. The temporomandibular ligament initiates translation of the condyle down the articular