Nedeljković Nenad, Stamenković Zorana, Tatić Zoran, Racić Alek
Stomatoloski fakultet, Klinika za ortopediju vilica, Beograd.
Vojnosanit Pregl. 2006 Feb;63(2):159-62. doi: 10.2298/vsp0602159n.
BACKGROUND/AIM: To assess the possibility of the eruption of the lower third molar on the basis of the measured parameters: retromolar space, mesiodistal crown width of a molar and the third molar angulation.
The investigation included 104 patients both sexes (43 boys, and 61 girls), 16 to 25 years old (mean age, 18 years). It was performed using the orthopanthomographic radiographs analysis of those patients. Each radiograph was covered by tracing paper, and the contoures of the following anatomic details were drawn: a) the crown and root contours of third molars, upper and lower central incisors, distal molars in occlusion, anterior edge of ramus mandible, b) lines: 1. the occlusal plane, 2. the line of retromolar space, 3. the mesiodistal crown width of third molar, 4. the axial shaft of the third molar and the distal angle between occlusal plane and the axial shaft of the third molar. The values were measured with an orthodontic caliper: the diameter of retromolar space, diameter of mesiodistal width, the value of distal angle between occlusal plane and axial shaft of molar.
A favourable angulation of the lower third molar (more than 60 degrees) was found in, boys (left 27.90%, right 32.55%), girls (left 39.34%, right 37.77%). A favourable relationship between the diameters of mesiodistal width of the third molar and retromolar space was found in, boys, (left 13.59%, right 16.27%), girls, (left 8.19%, right 14.75%). A favourable relationship between the diameters of mesiodistal width of the third molar and the retromolar space and the angulation was found in boys, (left 9.30%, right 11.62%), girls, (left 6.56%, right 9.83%).
There was not any statistically significant difference found between the relation of the retromolar value, third molar mesiodistal diameter, or of the third molar angulation to the left and the right side nor of their mutual relations in comparing boys and girls. A favourable prognosis was found in 9.33% of the patients.
背景/目的：基于测量参数（磨牙后间隙、磨牙近远中牙冠宽度及第三磨牙角度）评估下颌第三磨牙萌出的可能性。
该研究纳入了104例年龄在16至25岁（平均年龄18岁）的患者，男女均有（43名男孩和61名女孩）。通过对这些患者的曲面断层X线片进行分析。每张X线片覆盖描图纸，绘制以下解剖细节轮廓：a）第三磨牙、上下中切牙、咬合时的远中磨牙、下颌升支前缘的牙冠和牙根轮廓；b）线：1. 咬合平面；2. 磨牙后间隙线；3. 第三磨牙近远中牙冠宽度线；4. 第三磨牙的轴以及咬合平面与第三磨牙轴之间的远中角度。使用正畸卡尺测量以下数值：磨牙后间隙直径、近远中宽度直径、咬合平面与磨牙轴之间远中角度值。
发现男孩中下颌第三磨牙角度良好（大于60度）的比例为（左侧27.90%，右侧32.55%），女孩中为（左侧39.34%，右侧37.77%）。男孩中（左侧13.59%，右侧16.27%）、女孩中（左侧8.19%，右侧14.75%）发现第三磨牙近远中宽度直径与磨牙后间隙之间存在良好关系。男孩中（左侧9.30%，右侧11.62%）、女孩中（左侧6.56%，右侧9.83%）发现第三磨牙近远中宽度直径与磨牙后间隙以及角度之间存在良好关系。
在比较男孩和女孩时，磨牙后间隙值、第三磨牙近远中直径或第三磨牙角度与左右侧的关系及其相互关系之间未发现任何统计学上的显著差异。9.33%的患者预后良好。
