Wang Yanhua, Su Sha, Chen Xing, Jia Xueting
Department of Stomatology, Beijing Friendship Hospital, Capital Medical University, Beijing, China.
BMC Oral Health. 2024 Dec 30;24(1):1569. doi: 10.1186/s12903-024-05376-2.
Dens invaginatus is a developmental abnormality originating from tooth development, including coronal invaginatus and radicular invaginatus. The reported incidence varies greatly due to diagnostic techniques, classification criteria and race. The incidence of dens invaginatus in China was not clear, and the impact of dens invaginatus on periodontal support tissue were rarely reported. This study aims to clarify the incidence of maxillary lateral incisor dens invaginatus and its impact on periodontal supporting tissues.
From the cone-beam computed tomography database, images of 212 maxillary lateral incisors from 106 Chinese patients were selected. Teeth that met the Oehlers classification criteria for coronal invaginatus were recorded as coronal invaginatus, and teeth with radicular cystoid invaginatus or radicular groove were classified as radicular dens invaginatus. The complexity of radicular groove was determined by Gu's classification standard. Both of coronal invaginatus and radicular dens invaginatus were recorded as dens invaginatus. For 15 patients with unilateral radicular dens invaginatus, the periodontal ligament area of the affected teeth and the corresponding natural teeth in the same jaw were measured and compared.
The overall incidence of maxillary lateral incisor invaginatus in China is 25.0%. The incidence of coronal invaginatus is 12.3%, and the incidence of radicular dens invaginatus is 14.6%. No significant differences were observed between genders or sides. In this study, all radicular dens invaginatus exhibited as radicular groove, of which 87.1% were Gu type I, 9.7% were Gu type II, and 3.2% were Gu type III. Although the difference was not statistically significant, the average periodontal ligament area of the maxillary lateral incisor with radicular dens invaginatus was 148.93 ± 35.62mm, smaller than that of the control teeth (152.28 ± 40.22mm).
The dens invaginatus of the maxillary lateral incisor is common. There is no significant difference in the incidence between genders or between sides. The main manifestation of the radicular dens invaginatus is the radicular groove (Gu's type I). This anatomical abnormality may reduce the periodontal ligament area. The presence of the additional root of the maxillary lateral incisor is not rare and was supposed to be highly concerned by dentists.
牙内陷是一种源于牙齿发育的发育异常,包括冠部内陷和根部内陷。由于诊断技术、分类标准和种族的不同,报道的发病率差异很大。中国牙内陷的发病率尚不清楚,牙内陷对牙周支持组织的影响也鲜有报道。本研究旨在明确上颌侧切牙牙内陷的发病率及其对牙周支持组织的影响。
从锥形束计算机断层扫描数据库中选取106例中国患者的212颗上颌侧切牙图像。符合冠部内陷Oehlers分类标准的牙齿记录为冠部内陷,有根部囊状内陷或根部沟的牙齿分类为根部牙内陷。根部沟的复杂程度根据顾氏分类标准确定。冠部内陷和根部牙内陷均记录为牙内陷。对15例单侧根部牙内陷患者,测量并比较患牙及同侧相应正常牙的牙周膜面积。
中国上颌侧切牙内陷的总体发病率为25.0%。冠部内陷的发病率为12.3%,根部牙内陷的发病率为14.6%。性别和左右侧之间未观察到显著差异。在本研究中,所有根部牙内陷均表现为根部沟,其中87.1%为顾氏I型,9.7%为顾氏II型,3.2%为顾氏III型。尽管差异无统计学意义,但有根部牙内陷的上颌侧切牙的平均牙周膜面积为148.93±35.62mm,小于对照牙(152.28±40.22mm)。
上颌侧切牙牙内陷较为常见。性别和左右侧之间的发病率无显著差异。根部牙内陷的主要表现为根部沟(顾氏I型)。这种解剖异常可能会减少牙周膜面积。上颌侧切牙额外根的存在并不罕见,应引起牙医的高度关注。