乳磨牙与其恒牙胚的生理性吸收、牙龄和实足年龄之间的关系。
Relationship between Physiological Resorption of Primary Molars with Its Permanent Successors, Dental Age and Chronological Age.
作者信息
Caleya Antonia M, Gallardo Nuria E, Feijoo Gonzalo, Mourelle-Martínez M Rosa, Martín-Vacas Andrea, Maroto Myriam
机构信息
Department of Dental Clinical Specialties, Faculty of Dentistry, Complutense University of Madrid, 28040 Madrid, Spain.
Faculty of Dentistry, Alfonso X El Sabio University, 28691 Villanueva de la Cañada, Spain.
出版信息
Children (Basel). 2022 Jun 23;9(7):941. doi: 10.3390/children9070941.
UNLABELLED
The aim of the present study was to analyse root resorption of the primary mandibular molars and their relationship with their permanent successors and the age of the patient.
METHODS
The sample consisted of 408 digital panoramic radiographs. The mesial and distal crown-to-root ratios (CRR) of #74 and #75 were calculated by dividing the measures of the length of each root by its coronal height. The Demirjian formation stage of the premolar was established, and dental age was determined. A descriptive and statistical analysis was performed using SPSS to determine the correlation between the variables (Pearson's correlation coefficient) and to identify the differences between them (Student's -test), with a confidence level of 95%.
RESULTS
723 molars were measured, and tables of CRR depending on dental and chronological age were obtained. The CRR decreased with increasing dental and chronological age, but not uniformly. The CRR of #74 and #75 decreased slightly when the successor premolar was in the initial stages of formation. Gender differences were obtained with respect to chronological age, mainly in girls, because the root resorption of #74 was always more advanced, and the formation of the #34 more advanced.
CONCLUSIONS
Root resorption of the molar is slight and progressive when the successor premolar begins formation until stage D, and becomes higher starting at stage E. It is possible to determine the state of the child's maturation and the CRR according to dental and chronological age.
未标注
本研究的目的是分析下颌乳磨牙的牙根吸收情况及其与恒牙胚的关系以及患者的年龄。
方法
样本包括408张数字化全景X线片。通过将每个牙根的长度测量值除以其冠部高度来计算74和75号牙的近中及远中冠根比（CRR）。确定前磨牙的德米尔建发育阶段，并确定牙龄。使用SPSS进行描述性和统计分析，以确定变量之间的相关性（皮尔逊相关系数）并识别它们之间的差异（学生t检验），置信水平为95%。
结果
测量了723颗磨牙，获得了根据牙龄和实际年龄的CRR表格。CRR随着牙龄和实际年龄的增加而降低，但并非均匀下降。当继承前磨牙处于形成初期时，74和75号牙的CRR略有下降。在实际年龄方面存在性别差异，主要在女孩中，因为74号牙的牙根吸收总是更明显，34号牙的形成也更超前。
结论
当继承前磨牙开始形成直至D阶段时，磨牙的牙根吸收轻微且呈渐进性，从E阶段开始吸收程度增加。根据牙龄和实际年龄可以确定儿童的成熟状态和CRR。
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