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目的:验证数码照相牙色度分析法进行体内乳牙脱矿与再矿化研究的可行性。方法:选取58例平均年龄为4岁的儿童,以左上中切牙为实验牙,先染色、数码拍照,然后对实验牙面进行酸蚀、染色、数码拍照,最后在口腔环境内自然再矿化24h和1周后再染色、拍照,运用图像分析软件进行牙色度R、G、B值分析,比较酸蚀脱矿及再矿化前后牙色度的变化。用SPSS 19.0软件包对数据进行方差分析。结果:酸蚀脱矿后及再矿化24h后的色值(R、G、B)与基值有显著差异(P<0.05);在1周时间点上,只有B值与基值有显著差异(P<0.05);再矿化24h及1周后,牙色度值与酸蚀后相比有显著差异。结论:数码牙色度分析法可识别乳牙脱矿及再矿化前后牙色度的变化,可用于原位乳牙脱矿与再矿化研究。
OBJECTIVE: To verify the feasibility of the study of decolorization and remineralization of deciduous teeth in vivo with digital photography. METHODS: Fifty-eight children aged 4 years old were selected. The left upper central incisor was used as the experimental tooth, first stained and digitally photographed. Then the experimental tooth surface was etched, stained and photographed digitally. Finally, After 24h and 1 week, the samples were dyed and photographed. The R, G and B values of tooth decolorization were analyzed by image analysis software, and the change of tooth color before and after the acid-etching demineralization and remineralization were compared. Data were analyzed for variance using SPSS 19.0 software package. Results: There was significant difference (P <0.05) between the color values (R, G, B) after acid-etching and remineralization for 24 h after remineralization. At the time point of 1 week, only the values of B and base were significant (P <0.05). After remineralization 24h and one week later, there was a significant difference in tooth color values compared with that after acid etching. Conclusion: The digital dental chromaticity analysis can recognize the change of dental chroma before and after demineralization and remineralization, which can be used to study the demineralization and remineralization of primary deciduous teeth.