数字化颌位关系转移方法的研究进展

数字化颌位关系转移是将上下颌牙弓或者颌骨在习惯闭口位的三维位置关系以数字化方式转移到计算机系统从而使数字化模型可恢复稳定的咬合接触的方法,转移的内涵包括下颌牙列或牙弓相对于上颌的相对位置关系以及上牙列或牙弓相对于双侧颞下颌关节的位置关系.随着口腔修复数字化技术的不断发展,无论是模型诊断、美学设计、修复体设计、修复体预调(牙合)、还是疗效预测,都需要在计算机设计软件或数字化虚拟(牙合)架上精准的重现咬合接触关系.目前已经有多篇文献报道了不同数字化颌位关系转移的方法,比如通过口内扫描法或者口外模型扫描法获取上下颌位置关系,通过面部扫描、CBCT影像等方法获取牙列和颞下颌关节的位置关系等.这些研究操作各有繁简,精度各有差异.为了实现更为简便易行和达到更高精度的颌位关系转移,尚需更深入的研究.     

比色板标准与非标准色标识别差异的初探

目的 测试口腔修复学专业研究生对比色板标准色标与非标准色标颜色识别的差异,评价、分析口腔修复学专业研究生临床实际比色能力,为探讨临床比色教学方法提供客观的基础数据.方法 选择具有1～5年临床工作经验、排除色觉识别障碍、经过色彩学知识培训的口腔修复学专业研究生62名.从比色板A(Lineargnide)的29个标准色标中通过随机数字表抽取7个色标作为标准色标,以比色板B(Vita Bleachadgnide 3D-Master)中的7个色标作为非标准色标,在D55标准光源下,以比色板C(Vita 3D-Master)作为比色工具,对标准色标和非标准色标进行比色测试.计算受试者对两种色标比色的总体准确率;统计比色正确的人数分布,并进行Monte Carlo确切概率法检验;统计比色结果在明度、饱和度、色相上的等级偏差,并进行Wilcoxin符号秩和检验.结果 受试者对标准色标比色的总体正确率为45.9%(199/434),对非标准色标比色的总体正确率为9.0%(39/434);对两种色标比色正确的人数分布的差异有统计学意义(P<0.001);对两种色标比色结果的明度等级偏差[分别为0.2(0.1～0.3)、0.4(0.4～0.5)]、饱和度等级偏差[分别为0.2(0.1～0.4)、0.5(0.4～0.6)]的差异均有统计学意义(P<0.01),色相等级偏差[分别为0.3(0.1～0.4)、0.3(0.1～0.4)]的差异无统计学意义(P=0.079>0.01).结论 口腔修复学专业研究生对比色板非标准色标颜色的识别能力明显低于对标准色标颜色的识别能力.     

比色板标准与非标准色标识别差异的初探

Objective To compare the shade matching accuracy between tabs of shade guide and tabs out of shade guide by prosthodontists.Methods Sixty-two graduate students who had 1 to 5 years clinical experience without color blindness were included in this study.Twenty-nine tabs from Vita 3D-Master shadeguide and 7 tabs out of Vita 3D-Master shade guide but from Vita Bleachedguide 3D-Master were taken as the targets of shade matching and observed under the standard light.Subjects' shade matching accuracy on tabs of shadeguide and tabs out of shadeguide was recorded.Frequency of right match was analyzed using Monte Carlo exact probability-test Wilcoxin test was used to analyze the difference between each group on ranked data of value,chroma and hue.Results The shade matching accuracy of tabs of shade guide[45.9%(199/434)]was significantly higher than that of tabs out of shade guide[9.0%(39/434)].There was significant difference between the two kinds of tabs of ranked data of value[0.2 (0.1～0.3),0.4(0.4～0.5)]and chroma[0.2(0.1～0.4),0.5(0.4～0.6),P＜0.01 ],but there was no significant difference in hue data[0.3(0.1～0.4),0.3(0.1～0.4)].Conclusions The shade matching ability of prosthodontists on tabs out of shade guide is lower than that on tabs of shadeguide.To fulfill clinical need,more training is necessary.     

比色板标准与非标准色标识别差异的初探

Objective To compare the shade matching accuracy between tabs of shade guide and tabs out of shade guide by prosthodontists.Methods Sixty-two graduate students who had 1 to 5 years clinical experience without color blindness were included in this study.Twenty-nine tabs from Vita 3D-Master shadeguide and 7 tabs out of Vita 3D-Master shade guide but from Vita Bleachedguide 3D-Master were taken as the targets of shade matching and observed under the standard light.Subjects' shade matching accuracy on tabs of shadeguide and tabs out of shadeguide was recorded.Frequency of right match was analyzed using Monte Carlo exact probability-test Wilcoxin test was used to analyze the difference between each group on ranked data of value,chroma and hue.Results The shade matching accuracy of tabs of shade guide[45.9%(199/434)]was significantly higher than that of tabs out of shade guide[9.0%(39/434)].There was significant difference between the two kinds of tabs of ranked data of value[0.2 (0.1～0.3),0.4(0.4～0.5)]and chroma[0.2(0.1～0.4),0.5(0.4～0.6),P＜0.01 ],but there was no significant difference in hue data[0.3(0.1～0.4),0.3(0.1～0.4)].Conclusions The shade matching ability of prosthodontists on tabs out of shade guide is lower than that on tabs of shadeguide.To fulfill clinical need,more training is necessary.     

全牙测色比色仪测色准确性的体外研究

目的 通过比较比色板比色和全牙测色比色仪测色的准确入次,并分析比色仪测色结果与内置色度值的色差,评价全牙测色比色仪测色的准确性.方法 20名口腔修复专业医师用Vita 3D-Master比色板以及训练前后用Crystaleye全牙测色比色仪对固定在标准牙列模型上的8个比色片中央区分别进行比色板比色和比色仪测色,记录比色结果,计算比色板比色准确率和训练前后比色仪测色准确率.结果 20名受试对象比色板比色的准确率为49%,训练前后比色仪测色的准确率分别为83%、99%.结论 全牙测色比色仪的测色准确性明显高于比色板比色,掌握正确的测色方法后可以进一步提高测色准确性.

Abstract：

Objective To test AE between measured value and right value from the Crystaleye complete-tooth spectrophotometer, and to evaluate the accuracy rate of the spectrophotometer. Methods Twenty prosthodontists participated in the study. Each of them used Vita 3D-Master shadeguide to do the shade matching, and used Crystaleye complete-tooth spectrophotometer (before and after the test training)tested the middle of eight fixed tabs from shadeguide in the dark box. The results of shade matching and spectrophotometer were recorded. The accuracy rate of shade matching and the spectrophotometer before and after training were calculated. Results The average accuracy rate of shade matching was 49%. The average accuracy rate of the spectrophotometer before and after training was 83% and 99%. Conclusions The accuracy of the spectrophotometer was significant higher than that in shade matching, and training can improve the accuracy rate.     

数字化颌位关系转移方法的研究进展

数字化颌位关系转移是将上下颌牙弓或者颌骨在习惯闭口位的三维位置关系以数字化方式转移到计算机系统从而使数字化模型可恢复稳定的咬合接触的方法,转移的内涵包括下颌牙列或牙弓相对于上颌的相对位置关系以及上牙列或牙弓相对于双侧颞下颌关节的位置关系.随着口腔修复数字化技术的不断发展,无论是模型诊断、美学设计、修复体设计、修复体预调(牙合)、还是疗效预测,都需要在计算机设计软件或数字化虚拟(牙合)架上精准的重现咬合接触关系.目前已经有多篇文献报道了不同数字化颌位关系转移的方法,比如通过口内扫描法或者口外模型扫描法获取上下颌位置关系,通过面部扫描、CBCT影像等方法获取牙列和颞下颌关节的位置关系等.这些研究操作各有繁简,精度各有差异.为了实现更为简便易行和达到更高精度的颌位关系转移,尚需更深入的研究.     

比色板标准与非标准色标识别差异的初探

Objective To compare the shade matching accuracy between tabs of shade guide and tabs out of shade guide by prosthodontists.Methods Sixty-two graduate students who had 1 to 5 years clinical experience without color blindness were included in this study.Twenty-nine tabs from Vita 3D-Master shadeguide and 7 tabs out of Vita 3D-Master shade guide but from Vita Bleachedguide 3D-Master were taken as the targets of shade matching and observed under the standard light.Subjects' shade matching accuracy on tabs of shadeguide and tabs out of shadeguide was recorded.Frequency of right match was analyzed using Monte Carlo exact probability-test Wilcoxin test was used to analyze the difference between each group on ranked data of value,chroma and hue.Results The shade matching accuracy of tabs of shade guide[45.9%(199/434)]was significantly higher than that of tabs out of shade guide[9.0%(39/434)].There was significant difference between the two kinds of tabs of ranked data of value[0.2 (0.1～0.3),0.4(0.4～0.5)]and chroma[0.2(0.1～0.4),0.5(0.4～0.6),P＜0.01 ],but there was no significant difference in hue data[0.3(0.1～0.4),0.3(0.1～0.4)].Conclusions The shade matching ability of prosthodontists on tabs out of shade guide is lower than that on tabs of shadeguide.To fulfill clinical need,more training is necessary.     

比色板标准与非标准色标识别差异的初探

Objective To compare the shade matching accuracy between tabs of shade guide and tabs out of shade guide by prosthodontists.Methods Sixty-two graduate students who had 1 to 5 years clinical experience without color blindness were included in this study.Twenty-nine tabs from Vita 3D-Master shadeguide and 7 tabs out of Vita 3D-Master shade guide but from Vita Bleachedguide 3D-Master were taken as the targets of shade matching and observed under the standard light.Subjects' shade matching accuracy on tabs of shadeguide and tabs out of shadeguide was recorded.Frequency of right match was analyzed using Monte Carlo exact probability-test Wilcoxin test was used to analyze the difference between each group on ranked data of value,chroma and hue.Results The shade matching accuracy of tabs of shade guide[45.9%(199/434)]was significantly higher than that of tabs out of shade guide[9.0%(39/434)].There was significant difference between the two kinds of tabs of ranked data of value[0.2 (0.1～0.3),0.4(0.4～0.5)]and chroma[0.2(0.1～0.4),0.5(0.4～0.6),P＜0.01 ],but there was no significant difference in hue data[0.3(0.1～0.4),0.3(0.1～0.4)].Conclusions The shade matching ability of prosthodontists on tabs out of shade guide is lower than that on tabs of shadeguide.To fulfill clinical need,more training is necessary.     

比色板标准与非标准色标识别差异的初探

Objective To compare the shade matching accuracy between tabs of shade guide and tabs out of shade guide by prosthodontists.Methods Sixty-two graduate students who had 1 to 5 years clinical experience without color blindness were included in this study.Twenty-nine tabs from Vita 3D-Master shadeguide and 7 tabs out of Vita 3D-Master shade guide but from Vita Bleachedguide 3D-Master were taken as the targets of shade matching and observed under the standard light.Subjects' shade matching accuracy on tabs of shadeguide and tabs out of shadeguide was recorded.Frequency of right match was analyzed using Monte Carlo exact probability-test Wilcoxin test was used to analyze the difference between each group on ranked data of value,chroma and hue.Results The shade matching accuracy of tabs of shade guide[45.9%(199/434)]was significantly higher than that of tabs out of shade guide[9.0%(39/434)].There was significant difference between the two kinds of tabs of ranked data of value[0.2 (0.1～0.3),0.4(0.4～0.5)]and chroma[0.2(0.1～0.4),0.5(0.4～0.6),P＜0.01 ],but there was no significant difference in hue data[0.3(0.1～0.4),0.3(0.1～0.4)].Conclusions The shade matching ability of prosthodontists on tabs out of shade guide is lower than that on tabs of shadeguide.To fulfill clinical need,more training is necessary.