مدرس المادة
The mandibular second premolar most commonly has three cusps but can have two as well. The three-cusp variety has one large cusp on the buccal with two smaller lingual cusps. The mesiolingual cusp is twice the size of the distolingual cusp. The three-cusp type, is UNIQUE since it is the only premolar that has three triangular ridges (one per cusp), and these ridges do NOT join to form a transverse ridge.......
تحميل الملف