3-D 디지털 모델에서 교합간 기록의 정확도에 관한 연구

Abstract

The purpose of this study was to describe a new method for the analysis of occlusal contact and to evaluate the difference of distribution and vertical discrepancy of occlusal contacts on bite related digital casts. The stone casts obtained from ten subjects were scanned for the digitalized cast using laser scanner(Scanner S600, Zirkonzahn, Italy ). The interocclusal recordings available for mounting of the stone casts were taken on unilateral left and right molar side, bilateral molar side, anterior side and full mouth occlusal side. The vertical discrepancy of occlusal contacts on the digitalized cast was described as the scale unit of contact proximity. Occlusal contact patterns of digitalized casts articulated with six interocclusal records were compared to the occlusal contact of accurately articulated digitalized cast without interocclusal record.

The results were as following: 1. The patterns of occlusal contact were dependent to the interocclusal recording methods.

2. The distribution of occlusal contact on the biting side was decreased by the influence of unilateral biting materials' thickness.

3. The occlusal contacts on the digital cast articulated by anterior bites are similar to accurately articulated cast in maximum intercuspation, due to many teeth in contact.

When repositioned on the models, all records created significant discrepancies of occlusal contact on the digital models. This led to the conclusion that the when transferring the records onto the cast, inaccuracy obtained by during the procedure occurs dependent of the interocclusal recording methods. Based on this results, it was recommended in case of occlusion with the stable maxillomandibular relationship, less recording materials be put on the occlusal surface to make it fit precisely on the casts upon the repositioning.