A comparative study on the interocclusal registration accuracy of 3 kinds of intraoral scanning systems at different scarning ranges
Objective To investigate the difference in the accuracy of interocclusal registration between 3 kinds of intraoral scanners at different buccal occlusal scanning ranges.Methods Buccal virtual interocclusal re-cord was performed on standard plaster models mounted on a semi-adjustable atriculator using three types of intra-oral scanners(Medit i500,iTero element flex,3 Shape Trios3)in four different scanning ranges.The scanning range was divided into Group 1:range between bilateral canine teeth,Group 2:bilateral ranges between the first premolar and the second premolar,Group 3:bilateral ranges between the first premolar and the first molar,and Group 4:bilateral ranges between the first premolar and the second molar.The scanning was repeated 10 times in each group.In the control group,the occlusal relationship was obtained by desktop scanner.The maxillary models of the experimental group and the control group were best fitted and aligned,and the mandibular models kept un-changed from the initial occlusal position by matrix transformation.The effect of different scanning ranges on the accuracy of interocclusal registration was analyzed by the 3-dimensional deviation analysis technology.Results Under the same scanning system,the interocclusal registration precision of the anterior group(Group 1)was signifi-cantly lower than that of the three posterior groups(Group 2,Group 3,and Group 4)using i500 and Trios3(P＜0.05),and the difference was not statistically significant between the posterior group.At the same scanning range,the inter-occlusal registration correctness showed the same trend in the three intraoral scanners:the anterior group(Group 1)was signiticantly lower than the posterior groip(P＜0.05),the deviation of interocclusal registration decreased and cor-rectness increased as the scanning range increasec in the posterior group.The overall correctness and precision of in-terocclusal registration using iTero was superior to that of i500 and Trios3,and the difference was statistically signifi-cant(P＜0.05).Conclusion Different intraoral scanning systems at different scanning ranges will affect the intergc-clusal registration accuracy;the iTero interocclusal registration accuracy is superior to the i500 and Trios3.
万方数据
维普
