Department of Pediatric Dentistry, Osaka University Graduate School of Dentistry, 1-8 Yamada-oka, Suita, Osaka, 565-0871, Japan.
Sci Rep. 2022 Feb 28;12(1):3345. doi: 10.1038/s41598-022-07304-2.
Assessment of children's growth and development based on general and oral developmental status and dental age is important in pediatric dentistry for appropriate diagnosis and treatment. Teeth are a useful maturation index because they are unlikely to be affected by exogenous factors such as disease. We examined the correlation between chronological and dental age of permanent teeth in Japanese children and adolescents using orthopantomography. The sample comprised 1024 orthopantomographs from individuals aged 3-18 years, which were stored in an electronic media database for 10 years (2009-2019). We classified the developmental stages of each permanent tooth were classified into 11 stages, clarified the dental age for each developmental stage, and prepared a conversion table. Using the results, we compared the sequence and rate of development of each permanent tooth. We clarified the dental age of each permanent tooth from childhood to mid-adolescence and established a method for calculating the dental age of the whole jaw that is appropriate for modern Japanese individuals. We found that girls tended to form teeth at a faster rate than boys until puberty, but boys caught up with girls after puberty, suggesting that secondary sexual characteristics are involved in the rate of tooth formation.
基于一般和口腔发育状况以及牙龄来评估儿童的生长发育对于儿童牙科的适当诊断和治疗非常重要。牙齿是一种有用的成熟度指标，因为它们不太可能受到疾病等外源因素的影响。我们使用全景 X 光片检查了日本儿童和青少年的恒牙的实际年龄和牙龄之间的相关性。该样本包括 1024 名年龄在 3 至 18 岁的个体的全景 X 光片，这些 X 光片在电子媒体数据库中保存了 10 年（2009-2019 年）。我们将每个恒牙的发育阶段分为 11 个阶段，明确了每个发育阶段的牙龄，并准备了一个转换表。利用这些结果，我们比较了每个恒牙的发育顺序和速度。我们明确了每个恒牙从儿童期到青春期中期的牙龄，并建立了一种适合现代日本个体的计算整个颌骨牙龄的方法。我们发现，女孩在青春期前的牙齿形成速度比男孩快，但青春期后男孩赶上了女孩，这表明第二性征参与了牙齿形成的速度。
