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首页> 外文期刊>The Journal of Prosthetic Dentistry >Condylar repositioning in mandibular retrusion.
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Condylar repositioning in mandibular retrusion.

机译：下颌骨re缩中的trusion突复位。

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STATEMENT OF PROBLEM: There has been debate about which anteroposterior maxillomandibular relationship should be used in fixed and removable prosthodontics for patients without a definite maximal intercuspation. The choice has important implications for complete denture fabrication in which any guidance to the previous dentulous maximal intercuspal position is missing. PURPOSE: This study was designed to estimate the posterior displacement that takes place at the mandibular condyles and occlusal surfaces when the mandible is moved from maximal intercuspal position to the most retruded mandibular position. MATERIAL AND METHODS: Articulated occlusal models of 18 subjects with a natural dentition and well-defined maximal intercuspation were studied. Models were rearticulated in retruded contact position, and the original vertical dimension of occlusion was restored by eliminating all interfering occlusal contacts on the retruded path of closure. Measurement of change in condylar position was estimated using a SAM2 articulator with condylar position indicator. Posterior displacement at the occlusal surfaces was measured with a traveling microscope. RESULTS: Condylar analog retrusion in the horizontal plane at the initial retruded contact position varied from 0.6 to 2.4 mm (mean 1.0 +/- 0.4 mm); however, after occlusal adjustment to restore the original vertical dimension of occlusion, retrusion was reduced to a range of 0 to 0.4 mm (mean 0.2 +/- 0.1 mm). Retrusion at the occlusal surfaces was found to vary from 0.4 to 1.5 mm (mean 0.7 +/- 0.3 mm) at retruded contact position; however, after occlusal adjustment, retrusion was reduced to a range of 0 to 0.5 mm (mean 0.2 +/- 0.1 mm). CONCLUSION: Posterior displacement at both the occlusal surfaces and the condyles was small when interfering occlusal contacts on the retruded path of closure were removed.
机译：问题陈述：对于没有明确的最大内固定的患者，关于固定和活动义齿修复中应使用哪种上下颌下颌关系存在争议。该选择对于完整的义齿制造具有重要意义，在该义齿中缺少对先前的齿状最大齿间位置的任何指导。目的：本研究旨在评估当下颌骨从最大的cus骨位置移至最伸直的下颌骨位置时，在下颌con突和咬合面发生的后移。材料与方法：研究了18位自然牙列和明确最大咬合的受试者的咬合模型。在伸出的接触位置重新放置模型，并通过消除闭合的伸出路径上的所有干扰咬合接触来恢复原始的咬合垂直尺寸。使用带con位置指示器的SAM2咬合架估算con位置变化的测量值。用移动显微镜测量在咬合面的后移。结果：Con突在初始伸出的接触位置在水平面上的相似伸出量从0.6到2.4 mm（平均1.0 +/- 0.4 mm）不等。但是，在调整咬合度以恢复原始的垂直咬合尺寸后，后牙缩回减少到0到0.4毫米（平均0.2 +/- 0.1毫米）。发现在接触位置上，在咬合面的回缩范围为0.4至1.5 mm（平均0.7 +/- 0.3 mm）。但是，在咬合调整后，后退量减少到0到0.5毫米（平均0.2 +/- 0.1毫米）。结论：去除闭合闭合路径上的咬合接触时，咬合面和the的后移很小。

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