Cuminetti Fany, Boutin François, Frapier Laure
Département d'orthopédie dento-faciale, UFR odontologie, université de Montpellier, 545, avenue du Professeur-Jean-Louis-Viala, 34080 Montpellier, France.
PRAG informatique/Stat, UFR odontologie, université de Montpellier, 545, avenue du Professeur-Jean-Louis-Viala, 34080 Montpellier, France.
Int Orthod. 2017 Mar;15(1):54-68. doi: 10.1016/j.ortho.2016.12.011. Epub 2017 Jan 31.
The aim of this study was to assess the link between the degree of resorption of teeth adjacent to an impacted maxillary canine and the situation of the latter so as to identify factors predictive of resorption.
This was a retrospective study concerning all patients with impacted maxillary canines who consulted the orthodontics department at the Center for dental care, teaching and research (CSERD) in Montpellier between 2010 and 2015, with a full radiological file including panorex, periapical long-cone and cone-beam images. In all, 25 patients with 31 impacted maxillary canines were analyzed. Measurements were made by a single operator using 2D images and 3D analysis; they concerned the quantitative and qualitative aspects of resorption of teeth adjacent to the impacted canines and also evaluation of the position of the maxillary canine and its follicular sac. The X test was used to compare percentage resorption in men and women. Analysis of variance (ANOVA) was applied to compare the average degree of resorption of the adjacent teeth depending on the sagittal or vertical position of the impacted maxillary canine. Covariance analysis (ANCOVA) was used to study the average degree of resorption taking jointly into account the sagittal, vertical and transverse positions and adjusting for age and sex. Calculations were performed with a significance threshold of 5% using MyStat software.
Women made up 60.6% of the study population, with no significant age differences between the two sexes (21±5 years). The risk of adjacent resorption was not linked to age but was significantly greater (P-value=0.03) for women (60%) than for men (23%). The average degree of resorption is explained jointly by sagittal position (P-value=0.0001) and transverse position (P-value=0.01), after adjustment for age and sex. On the other hand, the average degree of resorption was not linked to vertical position, nor to the shape or size of the follicular sac.
This study leads to the conclusion that the risk of resorption of the lateral incisor is not linked to the buccal or palatal situation of the canine. The risk is greater when the canine is vertically above the lateral incisor root and close to the median palatine suture, suggesting a mechanical blockage by the apex of the lateral incisor.
本研究旨在评估上颌阻生尖牙相邻牙齿的吸收程度与该阻生尖牙情况之间的联系，以确定吸收的预测因素。
这是一项回顾性研究，涉及2010年至2015年间在蒙彼利埃牙科护理、教学与研究中心（CSERD）正畸科就诊的所有上颌阻生尖牙患者，其拥有完整的放射学档案，包括全景片、根尖长锥片和锥形束图像。总共分析了25例患者的31颗上颌阻生尖牙。由一名操作人员使用二维图像和三维分析进行测量；测量涉及阻生尖牙相邻牙齿吸收的定量和定性方面，以及对上颌尖牙及其滤泡囊位置的评估。采用X检验比较男性和女性的吸收百分比。应用方差分析（ANOVA）比较根据上颌阻生尖牙的矢状或垂直位置相邻牙齿的平均吸收程度。协方差分析（ANCOVA）用于联合考虑矢状、垂直和横向位置并对年龄和性别进行调整后研究平均吸收程度。使用MyStat软件进行计算，显著性阈值为5%。
女性占研究人群的60.6%，两性之间年龄无显著差异（21±5岁）。相邻牙齿吸收的风险与年龄无关，但女性（60%）的风险显著高于男性（23%）（P值 = 0.03）。在对年龄和性别进行调整后，矢状位置（P值 = 0.0001）和横向位置（P值 = 0.01）共同解释了平均吸收程度。另一方面，平均吸收程度与垂直位置、滤泡囊的形状或大小无关。
本研究得出结论，侧切牙吸收的风险与尖牙的颊侧或腭侧情况无关。当尖牙垂直位于侧切牙根上方且靠近腭中缝时，风险更大，提示侧切牙根尖存在机械性阻挡。
