Mandibular 2nd premolar
132. Occlusal outline of Mandibular 2nd premolar is Pentagonal (occlusal table- rectangular)
133. Premolar that is most likely to have a crescent-shaped central developmental groove – Mandibular 2nd premolar
134. Shortest interdental papilla – between man 2nd pm and 1st molar
135. Y-type mandibular premolar has 1 facial and 2 lingual cusps.
136. Y-type Mandibular 2nd premolar has the same no. of the occlusal pits as the maxillary 1st molar.
137. Mandibular 2nd premolar – ONLY premolar with multiple lingual cusps
138. Mandibular 2nd premolar – ONLY premolar with a lingual groove
139. Mandibular 2nd premolar – ONLY premolar with central fossa
140. The PM that most frequently has a single central pit is the mandibular second
141. MOST congenitally MISSING PREMOLAR
Maxillary 1st molar
142. Occlusal outline form – rhomboidal
143. MF and DL angles from the occlusal outline tend to be acute angles
144. ML and DF angles from the occlusal outline tend to be obtuse angles.
145. The Maxillary 1st molar tends to taper toward the facial rather than toward the lingual so the buccal embrasure is larger than lingual
146.Most prone facial and lingual surfaces of molars are the lingual of maxillary and the facial of mandibular.
147. Largest root of Maxillary 1st molar is Palatal
148. Smallest root of Maxillary 1st molar – distobuccal (MB root-MB2 hence should be bigger)
149. From facial view, apex of lingual root is in line with the facial groove of the tooth
150. View from L, in line with the midpoint of MD diameter
151. When 4th pulp canal present- MB
152. Of 3 furcations of Maxillary 1st molar- mesial is closest to the cervical line
153. Of 3 furcation of Maxillary 1st molar- distal is the furthest from cervical line Distance of furcations from cervical line- M<B<D