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首页> 外文期刊>American Journal of Orthodontics and Dentofacial Orthopedics >Etiologic factors for buccal and palatal maxillary canine impaction: A perspective based on cone-beam computed tomography analyses
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Etiologic factors for buccal and palatal maxillary canine impaction: A perspective based on cone-beam computed tomography analyses

机译：颊和pa上颌犬撞击的病因分析：基于锥束计算机断层扫描分析的视角

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Introduction: The aim of this research was to identify the etiologic factors associated with palatally impacted canines and buccally impacted canines in a Chinese population by using the cone-beam computed tomography technique. Methods: Pretreatment cone-beam computed tomography scans of 170 Chinese subjects with impacted maxillary canines and 170 age- and sex-matched subjects without impaction were used. Impacted canine subjects were divided into 2 groups: those with palatally impacted canines and those with buccally impacted canines. One rater analyzed the cone-beam computed tomography data for qualitative and quantitative variables of the teeth, dental arch, and skeletal components. The measurements were compared by using analytical statistical methods. Results: The mesiodistal dimension of the lateral incisor was significantly smaller in the palatally impacted canine group than in the other group (by an average of 0.4-0.5 mm; analysis of variance [ANOVA], P <0.001). Both anterior maxillary dental (interpremolar) width and skeletal width (interjugal points) in the buccally impacted canine group were significantly smaller than in the palatally impacted canine and control groups (ANOVA, P <0.001), whereas the intermolar widths and posterior mandibular widths were similar among the groups. The groups with palatally impacted or buccally impacted canines had significantly increased prevalence values of peg-shaped lateral incisors and incisor impaction, respectively (chi-square or Fisher exact tests, P <0.001). After excluding subjects who also had lateral incisor anomalies, the prevalence values of supernumerary teeth, missing premolars, or third molars combined were not different among the impaction and control groups. The average mesiodistal location of the canine cusp tip was significantly different between the buccally impacted canines and the palatally impacted canines groups; it was distal and mesial to the lateral incisor long axis, respectively. Conclusions: In Chinese subjects, buccal canine impaction is mostly associated with anterior transverse (dental and skeletal) deficiency and incisor impaction, whereas palatal impaction is mostly associated with small or missing lateral incisors, consistent with the guidance theory. Likely, preimpaction migrations of the canines are mainly buccal for buccal impactions and excessively mesiopalatal for palatal impactions.
机译：简介：这项研究的目的是利用锥束计算机断层扫描技术来确定与中国人群中lat及犬牙相关的病因。方法：对170名患有上颌尖牙犬的中国受试者和170名年龄和性别相匹配的无撞击受试者进行了预处理的锥形束计算机断层扫描。受影响的犬科动物分为两组：患上lat犬的犬和颊部犬的犬。一位评估者分析了锥束计算机断层扫描数据，以获取牙齿，牙弓和骨骼成分的定性和定量变量。使用分析统计方法比较测量结果。结果：impact碰犬组的侧门牙近中切尺寸明显小于其他组（平均0.4-0.5 mm;方差分析[ANOVA]，P <0.001）。颊部受累犬组的上颌前牙（前磨牙宽度）和骨骼宽度（颌间点）均显着小于the部受累犬和对照组（ANOVA，P <0.001），而磨牙间宽度和下颌后部宽度均各组之间相似。受lat或颊部影响的犬组的钉形侧切牙和切牙影响的患病率分别显着升高（卡方检验或Fisher精确检验，P <0.001）。在排除也有侧切牙异常的受试者后，在患病组和对照组之间，多余牙齿，前磨牙缺失或第三磨牙相结合的患病率没有差异。在颊部受累的犬齿和lat部受到影响的犬齿组之间，犬牙尖尖端的平均近中颌位置明显不同。它分别位于切牙长轴的远端和近中。结论：在中国受试者中，颊部犬牙撞击主要与前横（齿和骨骼）缺乏和门牙撞击有关，而pa上撞击主要与小或缺少侧切牙有关，这与指导理论一致。犬的撞击前迁移很可能主要是颊部撞击，是颊侧的，而pa上撞击则是近中顶的。

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