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Objective: The position of the denture base outline is an important factor that affects the retention and stability of complete dentures. However, positioning of the outline of lower complete dentures in particular varies among different practitioners. We conducted a series of studies, of which this is the first report. In this study, we used a traction device to determine the effect of the position of the denture base outline on retention of lower complete dentures. Here, we describe changes in retentivity for different amounts of retromolar pad area coverage by the denture base. Methods: The distal border of the experimental trial plate was trimmed in a phased manner to reduce the amount of coverage. The distal border was positioned at the distal end dome of the retromolar pad, at posterior border of the retromolar pad, at its 2/3 coverage, at its center, and at its anterior border. During this process, traction was applied to the experimental trial plate with a digital force gauge while it was inserted in the mouth, and the pulling force required to separate the denture base from the alveolar ridge was measured. The measured values obtained were used to compare the effect on retention of the positioning of the distal border of the denture base outline. At the same time, we also measured the dimensions of the retromolar pad area, and attempted to quantify the positioning of the denture base outline. 義歯床・離脱牽引力測定実験から得られた 下顎総義歯の床外形線設定位置に関する報告 第1報: 義歯床によるレトロモラーパッド部被覆量の 違いにおける維持力の検討

nihon gaku kougou gakkaishi kamiawase no kagaku/kamiawase no kagaku

A report on positioning of the denture base outline of lower complete dentures from experiments measuring the traction required to separate the denture base from the alveolar ridge