Department of Orthodontics, Faculty of Dentistry, Hacettepe University, Sihhiye, 06100, Ankara, Turkey.
J Orofac Orthop. 2022 Sep;83(5):325-331. doi: 10.1007/s00056-021-00293-3. Epub 2021 Apr 14.
The aim of this study was to compare mesiodistal width and symmetry of maxillary and mandibular teeth in subjects with and without unilateral maxillary lateral incisor agenesis.
The study group consisted of 31 patients with unilateral maxillary lateral incisor agenesis (19 females, 12 males, mean age: 16.55 ± 5.24 years), and a control group of 31 patients (19 females, 12 males, mean age: 16.58 ± 4.41 years) without agenesis. Mesiodistal dimensions of all teeth except second molars were measured. Paired samples t‑test and Wilcoxon signed-rank test were used for intragroup comparisons. Independent samples t‑test was used for intergroup comparisons.
In the study group, mesiodistal dimensions of maxillary canine, second premolar, first molar, mandibular second premolar and first molar teeth on the agenesis side were significantly smaller than on the contralateral side (p < 0.05). In the control group, no significant difference was seen in mesiodistal dimensions between right and left sides. In the study group, mesiodistal dimensions of all teeth on the lateral agenesis side were significantly smaller than on the control side (p < 0.05). On the side without lateral agenesis, all teeth except the maxillary and mandibular first molars and mandibular second premolar teeth were significantly smaller than on the control side (p < 0.05). Total mesiodistal dimensions of the maxillary teeth were significantly smaller on the lateral agenesis side than on the contralateral side (p = 0.001). Total tooth size of the study group was significantly smaller than for the control group (p < 0.05).
Patients with unilateral maxillary lateral incisor agenesis might have asymmetries in tooth width and have smaller teeth than individuals without agenesis.
本研究旨在比较单侧上颌侧切牙缺失患者和无缺失患者的上颌和下颌牙齿的近远中宽度和对称性。
研究组由 31 名单侧上颌侧切牙缺失患者（19 名女性，12 名男性，平均年龄：16.55±5.24 岁）组成，对照组由 31 名无缺失患者（19 名女性，12 名男性，平均年龄：16.58±4.41 岁）组成。测量所有除第二磨牙外的牙齿的近远中尺寸。使用配对样本 t 检验和 Wilcoxon 符号秩检验进行组内比较。使用独立样本 t 检验进行组间比较。
在研究组中，上颌侧切牙、第二前磨牙、第一磨牙、下颌第二前磨牙和第一磨牙在缺失侧的近远中尺寸明显小于对侧（p<0.05）。在对照组中，右侧和左侧的近远中尺寸没有显著差异。在研究组中，缺失侧的所有牙齿的近远中尺寸均明显小于对照组（p<0.05）。在无侧缺失的一侧，除上颌和下颌第一磨牙以及下颌第二前磨牙外，所有牙齿的近远中尺寸均明显小于对照组（p<0.05）。上颌牙齿的总近远中尺寸在缺失侧明显小于对侧（p=0.001）。研究组的总牙量明显小于对照组（p<0.05）。
单侧上颌侧切牙缺失的患者可能存在牙齿宽度的不对称，并且牙齿比无缺失的患者小。
