Zelić Ksenija, Nedeljković Nenad
Clinic of Restorative Dentistry and Endodontics, School of Dentistry, University of Belgrade, Belgrade, Serbia.
Vojnosanit Pregl. 2013 Oct;70(10):923-8. doi: 10.2298/vsp110509017z.
BACKGROUND/AIM: It is considered that the shortage of space is the major cause of the third molar impaction. The aim of this study was to establish the frequency of insufficient lower third molar eruption space in Serbian population, to question the differences in this frequency in the subjects of different age, to determine the influence of the lower third molar space (retromolar space) size on third molar eruption, and to investigate a possible correlation between the size of gonial angle and the space/third molar width ratio.
Digital orthopantomograms were taken from 93 patients divided into two groups: early adult (16-18 years of age) and adult (18-26) patients. Retromolar space, mesiodistal third molar crown width, gonial angle and eruption levels were measured.
The space/third molar width in early adult subjects was smaller (p < 0.0001) and insufficient space was significantly more frequent (p = 0.0003) than in adult patients. Considerably more third molars erupted in case of enough space in both age groups (p < 0.0001). There was no difference between the means of gonial angle size in relations to the available space.
The retromolar space/third molar width ratio is more favorable in adult subjects. Gonial angle is not in correlation with the retromolar space/third molar width ratio.
背景/目的：通常认为空间不足是第三磨牙阻生的主要原因。本研究的目的是确定塞尔维亚人群中下颌第三磨牙萌出空间不足的发生率，探讨不同年龄受试者在该发生率上的差异，确定下颌第三磨牙空间（磨牙后间隙）大小对第三磨牙萌出的影响，并研究下颌角大小与空间/第三磨牙宽度比值之间可能存在的相关性。
对93例患者进行数字化曲面断层片拍摄，这些患者分为两组：青年成人组（16 - 18岁）和成人组（18 - 26岁）。测量磨牙后间隙、第三磨牙近远中牙冠宽度、下颌角及萌出水平。
青年成人组的空间/第三磨牙宽度较小（p < 0.0001），且空间不足的发生率显著高于成人组（p = 0.0003）。在两个年龄组中，若有足够空间，第三磨牙萌出的情况明显更多（p < 0.0001）。下颌角大小均值在可用空间方面无差异。
成人组的磨牙后间隙/第三磨牙宽度比值更有利。下颌角与磨牙后间隙/第三磨牙宽度比值无关。
