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作者提出总义齿塑料基托折断原因:①牙槽嵴吸收的组织改变。②由于咀嚼所造成的反复应力在弯曲的基托区产生材料的疲劳。③托牙下沉到硬区上时,使基托有创伤性破损。作者以钢料加强物放入塑料试件,以测试其抗折力。方法:制备热凝塑料长56毫米、宽22毫米18件标本,在易受应力区作近似总义齿基托通常的厚度(2.4～3.3毫米),某些则垂直放置于预料折断区,某些位置则与预料折断区一致,半数加强物为薄的(0.8×2.4毫
The authors suggest that the plastic denture of the total denture should be broken: ① The tissue of the alveolar crest is absorbed. ② due to repeated stress caused by chewing in the bending of the base material fatigue. ③ denture sink to the hard area, so that the traumatic damage to the base. The author uses steel reinforcements to put plastic specimens in order to test their resistance to bending. METHODS: Eighteen specimens of thermosetting plastic, 56 mm long and 22 mm wide, were prepared. Approximately the total thickness of the denture base (2.4-3.3 mm) in the stress-susceptible area was approximated. Some were placed vertically in the expected fracture area and some The location is consistent with the expected breaking area, half of the reinforcement is thin (0.8 × 2.4 milliliter