Melbourne Dental School, Melbourne University, 720 Swanston Street, Melbourne, Victoria 3010, Australia; School of Anatomy, Physiology and Human Biology, University of Western Australia, 35 Stirling Highway, Crawley, Western Australia 6009, Australia.
School of Computer Science and Software Engineering, University of Western Australia, 35 Stirling Highway, Crawley, Western Australia 6009, Australia.
Comput Biol Med. 2015 May;60:143-50. doi: 10.1016/j.compbiomed.2015.03.007. Epub 2015 Mar 16.
Adequate occlusal contacts are critical for masticatory function. The aim of this study is to evaluate the intercuspal occlusal contacts following conventional and digital wax-ups.
Stone casts of 15 patients undergoing prosthodontic treatment were gathered. Each cast was duplicated twice, so that conventional and digital wax-ups could be performed. To assess the occlusion, the following variables were evaluated: contact number per tooth (CNT), contact area per tooth (CAT) and contact accuracy. Further, the impact of tooth location in the arch was assessed.
The CNT and CAT after the wax-ups increased significantly following each wax-up, and this increase was more prominent for the posterior teeth than the anterior teeth. The conventional wax-up was associated with lower CNT than the digital wax-up, especially for the posterior teeth. On the other hand, the CAT was greater for the conventional wax-up than the digital wax-up for the anterior and posterior teeth. In terms of accuracy, the two wax-ups showed greater discrepancies than the pre-treatment casts, however, the magnitude of discrepancy was greater for the digital wax-up.
The two wax-ups improved the contact number and area. Despite the statistical variation between the wax-ups, the actual difference was minimal. Therefore, it could be speculated that the two wax-ups produced a similar outcome.
充分的咬合接触对于咀嚼功能至关重要。本研究旨在评估常规和数字化蜡型后的正中𬌗牙合接触情况。
收集了 15 名接受修复治疗的患者的石膏模型。每个模型都复制了两份，以便进行常规和数字化蜡型。为了评估咬合，评估了以下变量：每颗牙的接触数（CNT）、每颗牙的接触面积（CAT）和接触准确性。此外，还评估了牙在牙弓中的位置的影响。
在每次蜡型后，牙合接触的 CNT 和 CAT 显著增加，而后牙的增加比前牙更为明显。常规蜡型的 CNT 低于数字化蜡型，尤其是在后牙。另一方面，对于前牙和后牙，常规蜡型的 CAT 大于数字化蜡型。在准确性方面，两种蜡型的差异比治疗前的石膏模型大，但数字化蜡型的差异幅度更大。
两种蜡型都增加了接触数和面积。尽管蜡型之间存在统计学差异，但实际差异很小。因此，可以推测两种蜡型产生了相似的结果。
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