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作者为探讨前磨牙的折裂机制及追踪其折裂的位置和频度。选用126颗完整的离体牙,用20颗作近中-(牙合)-远中(MOD)小范围银汞修复,27颗作MOD银汞牙尖复盖修复,19颗作MOD纯金复盖修复,12颗作金全冠修复,余牙作对照。将牙齿沿釉骨质界包埋于丙烯酸树脂中,然后,置于摆动的冲击测试器上,以600克冲击头反复撞击牙尖的舌侧斜面中点,并用旋转电位计和“峰值”电压表测定使牙折裂的撞击力。对照组牙齿折裂的位置和频度见图1,这些完整的牙齿仅撞击一次。修复后牙齿折裂的位置和频度见图2。
The authors investigated the fracture mechanism of the premolar and its location and frequency of trauma. A total of 126 intact isolated teeth were used. Twenty of them were used for near-mid-occlusion-distal (MOD) Cover repair, 12 for gold crown restoration, remaining teeth as a control. The teeth were embedded in acrylic resin along the enamel border and then placed on a rocking impact tester with a 600 gram impact head repeatedly striking the midpoint of the lingual bevel of the cusp and using a rotary potentiometer and a “peak” voltage Table to determine the impact of tooth fracture. The location and frequency of tooth fractures in the control group are shown in Figure 1 and these intact teeth only hit once. The position and frequency of tooth fracture after repair are shown in Fig.2.