International Journal of Computerized Dentistry, Pre-Print
Lee, Younghoo / Jung, Youngchul / Choi, Yeawon / Kim, Yuyeon / Kim, Sangbaek / Hong, Seoung-Jin / Kim, HyeongSeob / Pae, Ahran
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Aim: To compare the accuracy of three impression methods by comparing the distance between the reference points of the implant fixture, especially in curved maxillary anterior teeth.
Materials and methods: Implant fixtures were placed on the maxillary central incisor and canine areas. A maxillary master cast was made using a model scanner and 3D printer. Ten impressions were taken from the three experimental groups constructed (group P: pick-up impression coping; group I: scan body with an intraoral scanner; and group B: bite impression coping). The distance between the reference points, the angle between the scan bodies, and displacement of the 3D surface area were measured.
Results: The distance between reference points were significantly different between group I and group B in the maxillary incisors and between group P and the other two groups in the maxillary canines. Group P had the least amount of displacement in both fixtures. Both fixtures showed the highest displacement in group B. Displacement of the 3D surface area in the maxillary incisors showed no significant difference between the groups. There was a significant difference in the maxillary canines between groups P and I.
Conclusions: All three implant impression methods showed changes in the position and angle of the fixture compared with the master cast. In this study, the impression method using the pick-up impression coping showed the highest accuracy, but the impression method using the intraoral scanner also showed clinically acceptable accuracy. It should be noted that errors may occur when taking impressions using bite coping.