Nakanishi Ko, Mutoh Mami, Matsumura Kaoru, Kasai Machiko, Endo Ryoshun, Kikuchi Emi, Otsubo Shuhei, Matsushita Kazuhiro, Yamamoto Takaaki, Sato Yoshiaki
Department of Biomaterials and Bioengineering, Faculty of Dental Medicine, Hokkaido University, Sapporo, JPN.
Department of Orthodontics, Faculty of Dental Medicine and Graduate School of Dental Medicine, Hokkaido University, Sapporo, JPN.
Cureus. 2025 Mar 21;17(3):e80930. doi: 10.7759/cureus.80930. eCollection 2025 Mar.
Jaw deformities are known to cause occlusal collapse. However, the process of occlusal collapse is not clear. This study evaluated the dental health status of each tooth in patients with mandibular protrusion by age group to determine which teeth are affected by mandibular protrusion and clarify the progression of occlusal collapse.
This study evaluated the condition of each tooth in 113 patients with mandibular protrusion at the Orthodontic Department of Hokkaido University Hospital from 2013 to 2017 by age group. Patients were examined for decayed, missing, filled, and root canal-treated teeth. Filled teeth were classified into teeth with filling composite resin and inlay (Filled tooth), teeth with attached crown (Crown tooth), and abutment teeth of bridge by treatment methods.
The Decayed, Missing, and Filled Teeth (DMFT) index for mandibular protrusion patients for 10s, 20s, 30s, 40s, 50s, and 60s was 5.3, 10.2, 14.8, 19.3, 19.8, and 18.7, respectively, which was higher in all age groups than in the results of the 2016 Survey of Dental Diseases in Japan. The survival rates of the lower molar tended to be low. The Filled tooth rate tended to be higher for molars than for other teeth for all ages. The Crown and abutment tooth rate increased in various teeth in the maxilla. In the mandible, the Crown tooth rate in the premolar and molar greatly increased, and the abutment tooth wasn't found in the incisor. The root canal-treated tooth rate was higher in the molar with increasing age in the mandible.
The findings raised the possibility that patients with mandibular protrusion may be more susceptible to some oral diseases, such as caries, periodontal disease, and occlusal trauma, and the condition of the molar region may tend to deteriorate compared to other regions.
已知颌骨畸形会导致咬合紊乱。然而，咬合紊乱的过程尚不清楚。本研究按年龄组评估了下颌前突患者每颗牙齿的口腔健康状况，以确定哪些牙齿受下颌前突影响，并阐明咬合紊乱的进展情况。
本研究按年龄组评估了2013年至2017年在北海道大学医院正畸科就诊的113名下颌前突患者每颗牙齿的状况。对患者进行了龋齿、缺失牙、补牙和根管治疗牙的检查。补牙按治疗方法分为复合树脂补牙和嵌体补牙（补牙）、带冠牙（冠牙）以及桥基牙。
下颌前突患者10岁、20岁、30岁、40岁、50岁和60岁的龋失补牙（DMFT）指数分别为5.3、10.2、14.8、19.3、19.8和18.7，所有年龄组均高于2016年日本口腔疾病调查结果。下颌磨牙的存留率往往较低。各年龄段磨牙的补牙率往往高于其他牙齿。上颌各种牙齿的带冠牙和桥基牙率有所增加。在下颌，前磨牙和磨牙的带冠牙率大幅增加，切牙未发现桥基牙。下颌磨牙的根管治疗牙率随年龄增长而升高。
这些发现提示下颌前突患者可能更容易患某些口腔疾病，如龋齿、牙周病和咬合创伤，与其他区域相比，磨牙区的状况可能更容易恶化。
