下颌第三磨牙发育阶段与磨牙后间隙的相关性研究

发布时间：2018-01-16 18:07

本文关键词：下颌第三磨牙发育阶段与磨牙后间隙的相关性研究　出处：《新疆医科大学》2016年硕士论文　论文类型：学位论文

【摘要】：目的:通过对下颌第三磨牙发育形成情况与下颌磨牙后间隙的相关性分析,结合生物学年龄更为客观、准确的评价青少年生长发育,预测牙弓后端间隙的生长潜力,从而为临床错合畸形矫治计划的制定提供理论依据。方法:按照纳入标准选取在乌鲁木齐市口腔医院就诊的10~18岁初诊患者所拍摄的CBCT病例220例,按性别分为女性组115人、男性组105人。对不同性别研究对象参照Nolla法牙龄判断标准对下颌第三磨牙发育情况进行分期,并于CBCT影像上测量下颌第一磨牙后间隙及拥挤度,对数据进行统计分析,分析下颌第三磨牙牙龄与下颌第一磨牙后间隙之间的相关性。结果:(1)不同性别组之间第一磨牙后间隙存在差异,女性:(16.89±3.25)mm,男性:(15.74±2.97)mm,女性大于男性,差异有统计学意义(t=2.09,P0.05);(2)不同性别组间年龄、第三磨牙牙龄和拥挤度差异均无明显统计学意义(P0.05);(3)第三磨牙牙龄随年龄的增长而增长,年龄与第三磨牙牙龄之间存在直线相关关系,结果有统计学意义(r=0.818,P0.001);(4)第一磨牙后间隙也随着年龄的增长而增加,二者存在直线相关性,结果有统计学意义(r=0.746,P0.001);(5)下颌第三磨牙牙龄与第一磨牙后间隙之间存在直线相关性,结果有统计学意义(r=0.860,P0.001)。通过变量筛选,可计算得出第一磨牙后间隙与下颌第三磨牙牙龄之间的直线回归方程:女:y=9.27+1.50x,R2=0.774;男:y=8.26+1.44x,R2=0.773;经假设检验方程均有统计学意义,P0.05。结论:下颌第三磨牙的发育阶段可以用以评估预测下颌牙弓后段生长间隙潜力,为正畸矫治计划的制定提供参考依据。
[Abstract]:Objective: to analyze the relationship between the development of mandibular third molars and the posterior space of mandibular molars, and to evaluate the growth and development of adolescents more objectively and accurately in combination with biological age. The growth potential of the posterior arch space was predicted. So as to provide theoretical basis for the establishment of clinical malocclusion correction plan. Methods:. According to the inclusion criteria, 220 cases of CBCT were selected from 10 to 18 year old first diagnosed patients in Urumqi Stomatological Hospital. The subjects were divided into female group (115) and male group (105) according to sex. The development of mandibular third molar was divided into three stages according to Nolla method. The posterior space and crowding of the first mandibular molars were measured on CBCT images, and the data were analyzed statistically. The relationship between the age of mandibular third molar and the posterior space of mandibular first molar was analyzed. Results: there were differences in the first molar space between different sex groups, female: 1: 16.89 卤3.25mm. The male was 15.74 卤2.97 mm, the female was larger than the male, the difference was statistically significant (P 0.05). (2) there was no significant difference in age, age and crowding of the third molar among different sex groups (P 0.05). 3) the age of the third molar increased with age, and there was a linear correlation between the age and the age of the third molar. The results showed that there was a statistically significant difference between the age of the third molar and the age of the third molar (P 0.001). 4) the posterior space of the first molar also increased with the increase of age, and there was a linear correlation between the two. The results were statistically significant (P 0.001). 5) there was a linear correlation between the age of the third mandibular molar and the posterior space of the first molar, and the results were statistically significant. The linear regression equation between the posterior space of the first molar and the age of the mandibular third molar is obtained: female: female: 1. Male: 8.26 1.44xR2 0.773; Conclusion: the developmental stage of mandibular third molar can be used to evaluate the potential of predicting the growth space of posterior segment of mandibular arch. To provide reference for orthodontic treatment plan formulation.
【学位授予单位】：新疆医科大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：R783.5

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