Ticona-Flores Jesús Miguel, Reichard-Monefeldt Guillermo, Diéguez-Pérez Montserrat
Department of Dental Clinical Specialties, Complutense University of Madrid, Madrid, Spain.
Paediatric Dentistry, Preclinical Dentistry Department, European University of Madrid, Madrid, Spain.
J Orofac Orthop. 2024 Dec 23. doi: 10.1007/s00056-024-00566-7.
To determine whether unilateral preferent chewing (UPC) affects the position and angulation of the permanent maxillary canine germ on the preferred side.
In a retrospective cross-sectional study, medical records from children 7.91(± 0.8) years old with unilateral preferred chewing side and unilateral posterior crossbite were selected. The position of the maxillary canines was analysed by measuring the following angles and distances: the angles formed between the canine axis and the midline (PS; potential impact range > 15°), and that between the canine axis and the bicondylar line (W; potential impact range < 75°). In addition, the canine's position with respect to the lateral incisor (EK; potential impact range > II) and the distance between the canine cusp and the occlusal plane (CCOP potential impact range > 10 mm) were measured.
The final sample consisted of 106 radiographs; thus, a total of 212 maxillary canines were analysed. Tooth angulation on the preferred chewing side was higher for the angle PS with an average angle of 13.88° (± 7.56) and its position was more frequently found in sector II (49.1%), according to the EK analysis, compared to its contralateral that had an average of 11.75° (± 10.13) for the PS angle and a frequency of 67% in the sector I (p < 0.05 in both analyses). The data obtained for the angle W resulted in an average of 76.12° (± 9.09), while on the contralateral side it was 77.16° (± 12.56; p = 0.012). Lastly, according to the CCOP analysis, the preferred chewing side measured on average 15.3 mm (± 2.4), while on the nonpreferred side it was 15.19 mm (± 2.43; p = 0.143).
Based on this research, UPC seems to have a certain unfavourable influence on canine position and angulation. Thus, this is another factor to consider in decision-making regarding early treatment of this development disorder.
确定单侧偏好咀嚼（UPC）是否会影响上颌恒尖牙胚在偏好侧的位置和角度。
在一项回顾性横断面研究中，选取了7.91（±0.8）岁、有单侧偏好咀嚼侧和单侧后牙反合的儿童的病历。通过测量以下角度和距离来分析上颌尖牙的位置：尖牙轴与中线之间形成的角度（PS；潜在影响范围>15°），以及尖牙轴与双侧髁突连线之间的角度（W；潜在影响范围<75°）。此外，测量尖牙相对于侧切牙的位置（EK；潜在影响范围>II）以及尖牙牙尖与咬合平面之间的距离（CCOP；潜在影响范围>10mm）。
最终样本包括106张X线片；因此，共分析了212颗上颌尖牙。根据EK分析，偏好咀嚼侧的牙齿角度PS平均为13.88°（±7.56），其位置更常出现在II区（49.1%），而对侧的PS角度平均为11.75°（±10.13），在I区的频率为67%（两项分析中p均<0.05）。角度W的数据平均为76.12°（±9.09），而对侧为77.16°（±12.56；p = 0.012）。最后，根据CCOP分析，偏好咀嚼侧平均测量值为15.3mm（±2.4），而非偏好侧为15.19mm（±2.43；p = 0.143）。
基于本研究，UPC似乎对尖牙的位置和角度有一定的不利影响。因此，这是在考虑这种发育障碍的早期治疗决策时需要考虑的另一个因素。
