Faculty of Dentistry, Trisakti University, Jakarta, Indonesia.
Former Orthodontics Resident, Postgraduate Orthodontic Program, Arizona School of Dentistry & Oral Health, A.T. Still University, Mesa, Arizona.
J World Fed Orthod. 2020 Dec;9(4):164-169. doi: 10.1016/j.ejwf.2020.08.001. Epub 2020 Sep 17.
The Indonesian population consist of Deutromalay and Protomalay races, with the Deutromalay race being most of the population. In 1972, Lawrence F. Andrews introduced the "six keys of normal occlusion," which was based on a white sample. This study aimed to identify standard tooth angulation and inclination in the Deutromalay race, which might help in future development of bracket prescription specific to the population.
This cross-sectional study was conducted on a representative sample of 190 subjects (112 male and 78 female subjects) aged 14 to 22 years from the Deutromalay population. Data collection was performed by two investigators following the methodology prescribed by Andrews for measuring tooth crown angulations and inclinations. Inter-rater reliability was measured with kappa statistics. Data were analyzed using SPSS software, version 25. Independent-samples t-tests were used for significance testing. The alpha level for statistical significance was set at 0.05, two-tailed.
The kappa statistic came out to be 0.80, which showed substantial agreement. The results of the t-test for tooth angulation and inclination found significant differences between male and female subjects for some teeth within the Deutromalay sample. In addition, significant differences were found for most teeth between the Deutromalay and white samples.
Significant differences in crown angulation and inclination values exist for most teeth in the Deutromalay sample studied compared with the white norms reported by Andrews. This points to the possible need to develop a new preadjusted bracket prescription specific for the Indonesian (Deutromalay) population.
印度尼西亚人口由德罗马莱亚族和原始马来亚族组成，其中德罗马莱亚族占多数。1972 年，劳伦斯·安德鲁斯（Lawrence F. Andrews）提出了“正常咬合的六个关键”，这一理论基于白人样本。本研究旨在确定德罗马莱亚族的标准牙齿角度和倾斜度，这可能有助于未来开发针对该人群的特定托槽处方。
这是一项横断面研究，选取了 190 名年龄在 14 至 22 岁的德罗马莱亚族代表性样本（男性 112 名，女性 78 名）。数据采集由两位研究人员按照安德鲁斯（Andrews）规定的测量牙冠角度和倾斜度的方法进行。使用 Kappa 统计量评估两位研究者之间的可靠性。使用 SPSS 软件（版本 25）进行数据分析。使用独立样本 t 检验进行显著性检验。统计显著性的α水平设定为 0.05，双侧。
Kappa 统计量为 0.80，显示出高度一致性。德罗马莱亚族样本中，一些牙齿的牙角度和倾斜度的 t 检验结果显示，男女之间存在显著差异。此外，德罗马莱亚族样本与白人样本之间，大多数牙齿的牙角度和倾斜度也存在显著差异。
与安德鲁斯（Andrews）报告的白人标准相比，在所研究的德罗马莱亚族样本中，大多数牙齿的牙冠角度和倾斜度值存在显著差异。这表明可能需要为印度尼西亚（德罗马莱亚族）人群开发新的预调整托槽处方。
