Yang X, Le D, Zhang Y L, Liang L Z, Yang G, Hu W J
1. Department of Periodontology, Peking University School and Hospital of Stomatology & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China; 2. Stomatology Center, China-Japan Friendship Hospital, Beijing 100029,China.
Department of Periodontology, Peking University School and Hospital of Stomatology & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China.
Beijing Da Xue Xue Bao Yi Xue Ban. 2016 Oct 18;48(5):866-870.
To explore a crown form classification method for upper central incisor which is more objective and scientific than traditional classification method based on the standardized photography technique. To analyze the relationship between crown form of upper central incisors and papilla filling in periodontally healthy Chinese Han-nationality youth.
In the study, 180 periodontally healthy Chinese youth ( 75 males, and 105 females ) aged 20-30 (24.3±4.5) years were included. With the standardized upper central incisor photography technique, pictures of 360 upper central incisors were obtained. Each tooth was classified as triangular, ovoid or square by 13 experienced specialist majors in prothodontics independently and the final classification result was decided by most evaluators in order to ensure objectivity. The standardized digital photo was also used to evaluate the gingival papilla filling situation. The papilla filling result was recorded as present or absent according to naked eye observation. The papilla filling rates of different crown forms were analyzed. Statistical analyses were performed with SPSS 19.0.
The proportions of triangle, ovoid and square forms of upper central incisor in Chinese Han-nationality youth were 31.4% (113/360), 37.2% (134/360) and 31.4% (113/360 ), respectively, and no statistical difference was found between the males and females. Average κ value between each two evaluators was 0.381. Average κ value was raised up to 0.563 when compared with the final classification result. In the study, 24 upper central incisors without contact were excluded, and the papilla filling rates of triangle, ovoid and square crown were 56.4% (62/110), 69.6% (87/125), 76.2% (77/101) separately. The papilla filling rate of square form was higher (P=0.007).
The proportion of clinical crown form of upper central incisor in Chinese Han-nationality youth is obtained. Compared with triangle form, square form is found to favor a gingival papilla that fills the interproximal embrasure space. The consistency of the present classification method for upper central incisor is not satisfying, which indicates that a new classification method, more scientific and objective than the present one, is to be found.
探索一种基于标准化摄影技术的、比传统分类方法更客观科学的上颌中切牙冠形分类方法。分析牙周健康的中国汉族青年上颌中切牙冠形与龈乳头充盈情况之间的关系。
本研究纳入180名年龄在20 - 30岁（24.3±4.5岁）的牙周健康的中国青年（男性75名，女性105名）。采用标准化的上颌中切牙摄影技术，获取360颗上颌中切牙的图片。由13名经验丰富的口腔修复专业专科医生独立将每颗牙齿分类为三角形、卵圆形或方形，最终分类结果由多数评估者决定以确保客观性。还使用标准化数码照片评估牙龈乳头充盈情况。根据肉眼观察将乳头充盈结果记录为存在或不存在。分析不同冠形的乳头充盈率。使用SPSS 19.0进行统计分析。
中国汉族青年上颌中切牙三角形、卵圆形和方形的比例分别为31.4%（113/360）、37.2%（134/360）和31.4%（113/360），男性和女性之间无统计学差异。每两位评估者之间的平均κ值为0.381。与最终分类结果相比，平均κ值提高到0.563。本研究中，排除24颗无接触的上颌中切牙，三角形、卵圆形和方形冠的乳头充盈率分别为56.4%（62/110）、69.6%（87/125）、76.2%（77/101）。方形冠的乳头充盈率更高（P = 0.007）。
得出中国汉族青年上颌中切牙临床冠形的比例。与三角形冠相比，方形冠更有利于龈乳头填充邻间隙。目前上颌中切牙分类方法的一致性不令人满意，这表明需要找到一种比现有方法更科学、客观的新分类方法。
