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Dental Anatomy: Permanent mandibular molars

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الكلية كلية طب الاسنان     القسم ترميم ومعالجة الاسنان     المرحلة 1
أستاذ المادة ذو الفقار غالي حميد الخفاجي       25/04/2017 21:22:51
Permanent mandibular 1st molar:
?Generally, it opposes the (upper) first molar and second premolar in normal class I occlusion.
?The first molar is usually the first permanent tooth to erupt.
?The function is similar to that of all molars in regard to grinding being the principal action during mastication (chewing).
?The permanent mandibular molars are non-succedaneous teeth, the deciduous molars are followed by the permanent premolars.
Principle identifying features of the permanent mandibular 1st molar:
?It is the largest tooth in the mandibular arch. Its occlusal surface is rectangular in shape.
?Usually, it has five well-developed cusps, two buccally, two lingually, and one distal.
?It has two well-developed roots, one mesial and one distal.
?Dimension of the crown mesiodistally is greater by about 1 mm than the dimension buccolingually.
Permanent mandibular 2nd molar:
?It supplements the 1st molar in function, have nearly same general morphology, but differ in the following:
It is smaller than 1st molar by fraction of millimeter in all dimension, but it is not uncommon to find 2nd molar larger than 1st molar.
Although 2nd molar has two well developed roots (broad buccolingually), but they are not as broad as those of the first molar, nor are they as widely separated.
Buccally, only one developmental groove present, buccal groove.
?It has only four well developed cusps of nearly equal size, there is neither fifth cusp or distal cusp. DB developmental groove absent.
?Crown and root converge lingually to lesser degree than the 1st molar.
?Cervical ridge buccally is less pronounced than the 1st molar.
?B & L developmental grooves meet the central developmental groove at right angles at the CP, these grooves form a cross (dividing occlusal surface into 4 nearly equal parts).


المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .
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