上颌尖牙转矩结合颊廊对微笑美影响的研究OACSTPCD

Objective The study wanted to evaluate that the different maxillary canine torques combined with different buccal corridors had an effect on smile esthetics.Methods An adult female perioral smile photograph,fitted with a three-dimensional digital model and image processing software,yielded 49 smile photographs(buccal corridor adjusted from 0%-30%with 5%interval and cuspid torque adjusted from-18° to 12° with 5° interval),each photo was numbered accordingly(from 1 to 49)and the order of the photos was disordered to place them in the same album,and 60 dental professionals and 60 laypersons were instructed to score the aesthetics of the photos by using visual analogues.Results were analyzed by General linear model,Kruskal-Wallis test,Mann-Whitney U test and other statistical methods.Results ①There was no statistical difference in the interaction between canine torque and buccal corridor(P＞0.05).②When the canine torque remained constant,the effect of the buccal corridor on smile aesthetics was statistically significant(P＜0.05).When the buccal corridor was 10%-20%,the difference between the scores was statistically significant(P＜0.05),and when the buccal corridor was 15%,the score was the highest(P＜0.05).③In most cases,when the buccal corridor was unchanged,the effect of the canine torque on smile aesthetics was not statistically significant(P＜0.05).Conclusion In most cases,the interaction of the maxillary canine torque and the buccal corridor has not been found to enhance or diminish the esthetics of smile.The impact on aesthetics depends mainly on the buccal corridor,with an acceptable range of 10%to 20%and an optimal smile at 15%.