Comparative study of dental cephalometric patterns of Japanese-Brazilian, Caucasian and Mongoloid patients

INTRODUCTION: The objective of this study was to identify the patterns of dental variables of adolescent Japanese-Brazilian descents with normal occlusion, and also to compare them with a similar Caucasian and Mongoloid sample. METHODS: Lateral cephalometric radiographs were used to compare the groups: Caucasian (n = 40), Japanese-Brazilian (n = 32) and Mongoloid (n = 33). The statistical tests used were one-way ANOVA and ANCOVA. The cephalometric measurements used followed the analyses of Steiner, Tweed and McNamara Jr. RESULTS: Statistical differences (P < 0.05) indicated a smaller interincisal angle and overbite for the Japanese-Brazilian sample, when compared to the Caucasian sample, although with similar values to the Mongoloid group. CONCLUSION: The dental patterns found for the Japanese-Brazilian descents were, in general, more similar to those of the Mongoloid sample.

引言：本研究旨在明确具有日本-巴西血统的青少年正常𬌗（normal occlusion）人群的牙科变量分布特征，并将其与匹配度相近的高加索人种及蒙古人种样本进行对比分析。
研究方法：本研究采用头颅侧位头影测量片（lateral cephalometric radiographs）对三组受试者开展对比分析，各组分别为高加索人种组（n=40）、日本-巴西血统组（n=32）及蒙古人种组（n=33）。本研究所选用的统计学检验方法包括单因素方差分析（one-way ANOVA）与协方差分析（ANCOVA）。头影测量指标的选取严格遵循斯坦纳（Steiner）、特威德（Tweed）及小麦克纳马拉（McNamara Jr）的头影测量分析体系。
研究结果：统计学分析结果显示（P<0.05），与高加索人种组相比，日本-巴西血统组受试者的切牙间角（interincisal angle）及覆𬌗（overbite）均更小，且该组的相关指标数值与蒙古人种组无显著差异。
研究结论：总体而言，日本-巴西血统青少年的牙科特征模式与蒙古人种样本更为接近。