恒牙早期阶段乳侧切牙早失后短期间隙变化的临床评估。
Clinical evaluation of short term space variation following premature loss of primary second molar, at early permanent dentition stage.
作者信息
Bindayel Naif A
机构信息
Department of Pediatric Dentistry and Orthodontics, College of Dentistry, King Saud University, Saudi Arabia.
出版信息
Saudi Dent J. 2019 Jul;31(3):311-315. doi: 10.1016/j.sdentj.2019.03.002. Epub 2019 Mar 20.
PURPOSE
The present study aimed at determining whether the premature loss of a deciduous second molar results in a clinically relevant loss of space and arch length reduction.
METHODS
Split mouth evaluation of approximately 32 patients at early permanent dentition stage with unilateral premature loss of the deciduous second molar either in the upper arch or the lower arch. The contra lateral side with no tooth loss served as controls. Dental models and radiographs were obtained. The space in the extraction site and control sides were measured and analyzed for space loss and eruption stage of premolars in three weeks time frame.
RESULTS AND CONCLUSION
The mean combined space before second primary molar extraction was 25.04 mm (±4.25), while the average space post extraction was 24.61 (±4.27) and the difference was found to be statistically significant (P < 0.01). Furthermore, neither subject's age, nor successor premolar eruption stage were found to be correlated significantly with the amount of space loss (P-values 0.989 and 0.811, respectively). Space loss after premature extraction of second primary molar in three weeks time frame was statistically significant thereby emphasizing the use of space maintainers at the earliest.
目的
本研究旨在确定乳牙第二磨牙过早缺失是否会导致临床上相关的间隙丧失和牙弓长度减小。
方法
对约32例处于恒牙早期阶段的患者进行分口评估，这些患者单侧上颌或下颌乳牙第二磨牙过早缺失。对侧无牙缺失的一侧作为对照。获取牙模和X线片。在三周的时间范围内，测量并分析拔牙部位和对照侧的间隙，以确定间隙丧失情况和前磨牙的萌出阶段。
结果与结论
拔除第二乳磨牙前的平均总间隙为25.04毫米（±4.25），拔牙后的平均间隙为24.61（±4.27），差异具有统计学意义（P < 0.01）。此外，未发现患者年龄和继承前磨牙萌出阶段与间隙丧失量有显著相关性（P值分别为0.989和0.811）。在三周时间范围内，第二乳磨牙过早拔除后的间隙丧失具有统计学意义，因此强调应尽早使用间隙保持器。
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