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- W389665622 abstract "The Selection of the retainer in partial dentures is very important for the prognosis of the abutment tooth. In order to minimize the damage to periodontal tissues supporting the abutment tooth, numerous studies on the abutment tooth behavior with partial prostheses have been undertaken in various methods ; strain gauge, photoelastic, mandibular kinesiograph, CCD camera, and finite element methods. However, the effect of the clasp design on the behavior of the abutment teeth is unclear yet. In this study, the original analysis system in six degrees of freedom was developed to measure the movement of the abutment tooth of the removable denture. The measuring device of this system is composed of only three position sensitive detectors (PSD) and a laser oscillation device. Therefore high accuracy, light weight and small body were accomplished. The experimental denture was prepared on a simulation model of Kennedy Class II which is partially edentulous. The alveolar ridge, and the root of the abutment tooth were covered with silicone material for simulating the mucosa and the periodontal membrane. The experimental denture was designed to allow replacement of five types of clasp (Aker's Clasp ; As, Aker's Clasp With Proximal plane ; Ap, Back action clasp ; Ba, Krol's RPI retainer ; Kr, Kratochvil's RPI retainor ; Kt). The load was applied on central fossa of the artificial first molar on the experimental denture by compressive machine. The load was increased gradually (1 mm/min) to 7N. The measurements were performed three times for each clasp. The results were as follows : 1. The original analysis system in six degrees of freedom was very useful to determine the movement of abutment tooth of the partial denture. Since this system is small size, light weight and high accuracy, the application for live tooth is expected. 2. Inclination, rotation, bodily movement of the abutment tooth with the Ap and the As were the largest among the clasps. The movement of the tooth with Kt was the smallest as compared with other clasps. 3. With the use of the Ba, the inclination and sinking of the abutment tooth were considerably small. But the bodily movements of the tooth in horizontal direction were large. It seems that this type of clasp does not affect the abutment tooth harmfully. 4. With the Kr, the directions of the abutment tooth movement were changed in the bucco-lingual movement, mesio-distal movement and rotation. It seems that the proximal plate slipped from the proximal plane of the abutment tooth at approximately 3N." @default.
- W389665622 created "2016-06-24" @default.
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- W389665622 date "1999-01-01" @default.
- W389665622 modified "2023-10-18" @default.
- W389665622 title "Development of the Measurement Device in Six Degrees of Freedom for Analyzing Abutment Tooth Movement" @default.
- W389665622 doi "https://doi.org/10.2504/kds.53.111" @default.
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