The placement of a retentive pin in the
proximal regions of posterior teeth would
MOST likely result in periodontal
ligament perforation in the

1 explanations

1. 

   Honey

   Characteristics of mandibular first molar (1) Buccal aspect •.MB cusp is the widest than DB and D cusps •.MB and DB grooves extend to buccal surface (2) Lingual aspect •.ML and DL cusps of equal size • Lingual groove extends midway on lingual surface • Cervical 1/3 is flat or concave (3) Proximal aspect • Both mesial and distal contact areas are at the middle third (4) Occlusal aspect • The outline is pentagonal shaped, Broader buccally than lingually • 5 Cusps: two lingual cusps and three buccal cusps (MB, DB, and distal—in order of decreasing size) (4) Root • 98% two roots: mesial and distal • Chance of two canals: 6.7%, three canals: 65%. Four canals: 29%

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