Utz K-H, Müller F, Lückerath W, Schwarting P, Noethlichs W, Büttner R, Fuss E, Grüner M, Koeck B
Department of Prosthetic Dentistry, Dental School, University of Bonn, Bonn, Germany.
J Oral Rehabil. 2007 Jun;34(6):406-13. doi: 10.1111/j.1365-2842.2007.01731.x.
The habitual intercuspation is used ubiquitous for manufacturing small dental restorations. However, a little is known on its precision. The aim of the present study was therefore to investigate the unambiguity and accuracy of the habitual occlusion in mounted plaster casts from fully dentate persons. Eighty-one fully dentate volunteers, 36 women and 45 men aged 26.8 +/- 6.2 years (18-55 years), with minor fillings and no signs or symptoms of TMD took part in the experiments. Silicone impressions were taken, poured with stone plaster and the obtained casts mounted into Dentatus ARL(R)- articulators using an individual face bow transfer. Subsequently, the models were transferred to a custom-made measuring articulator where the lateral leeway and the accuracy of the hand-held habitual intercuspation were quantified in the condylar area. Measurements were repeated seven times with the upper cast pushed either to the maximum right or the maximum left intercuspation. The hand-held habitual intercuspation of upper and lower cast proved ambiguous in 57% of pairs of casts. The average lateral leeway of the habitual intercuspation in the condylar area was 0.10 +/- 0.05 mm (0-0.51 mm; median 0.07 mm) between the maximum right and left occlusal positions. The average accuracy of three repeated measurements was 0.22 +/- 0.09 mm (0.02-1.17 mm; median 0.16 mm). Natural occlusal surfaces in a full dentition do not guarantee an unambiguous habitual intercuspation of the plaster casts. The described leeway and technical limits might be possible causes for occlusal adjustments that are sometimes necessary when inserting restorations manufactured in habitual intercuspation.
习惯性牙尖交错位在小型牙体修复体制作中被广泛应用。然而，其精确性却鲜为人知。因此，本研究的目的是调查全口牙列患者石膏模型上习惯性咬合的明确性和准确性。81名全口牙列的志愿者参与了实验，其中36名女性，45名男性，年龄在26.8±6.2岁（18 - 55岁），有少量充填物，无颞下颌关节紊乱病的体征或症状。制取硅橡胶印模，灌注石膏，使用个体面弓转移将所得模型安装到Dentatus ARL(R)型牙合架上。随后，将模型转移到定制的测量牙合架上，在髁突区域量化手持习惯性牙尖交错位的侧方自由度和准确性。将上颌模型推至最大右侧或最大左侧牙尖交错位，测量重复7次。上下颌模型的手持习惯性牙尖交错位在57%的模型对中表现出不明确性。在最大右侧和左侧咬合位置之间，习惯性牙尖交错位在髁突区域的平均侧方自由度为0.10±0.05 mm（0 - 0.51 mm；中位数0.07 mm）。三次重复测量的平均准确性为0.22±0.09 mm（0.02 - 1.17 mm；中位数0.16 mm）。全口牙列的天然牙合面并不能保证石膏模型上习惯性牙尖交错位的明确性。所描述的自由度和技术限制可能是在插入按习惯性牙尖交错位制作的修复体时有时需要进行咬合调整的原因。
