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目的对离体后磨牙模拟牙髓治疗后,二种洞型进行折裂负荷测试。方法取离体完整后磨牙分成3组,每组32颗,A组为对照组(完整牙),B组和C组分别制备成邻洞型和邻颊(舌)洞型,模拟牙髓治疗后进行银汞充填术,然后在10吨液压式万能试验机进行折裂负荷测试。结果其抗折力分别为:完整牙4324.17 N(441.22kgf),邻颊(舌)洞型3103.57 N(316.69 kgf),邻洞型1873.33 N(191.16 kgf)。经统计学分析,邻洞型抗折力明显低于完整牙抗折力(Р<0.001),其次是邻颊(舌)洞型抗折力也低于完整牙抗折力(Р<0.05),但邻颊(舌)洞型抗折力明显高于邻洞型抗折力(Р<0.05)。结论邻颊(舌)洞型抗折力优于邻洞型。
OBJECTIVE: To simulate endodontic treatment of isolated posterior teeth, two types of holes were subjected to the stress test. Methods The intact molars were divided into three groups (32 in each group). Group A was the control group (intact teeth). Group B and group C were made into adjacent cavities and adjacent buccal (tongue) After amalgam filling, and then 10 tons of hydraulic universal testing machine for load test. The results showed that the bending strength of intact teeth was 4324.17 N (441.22kgf), 3103.57 N (316.69 kgf) for the buccal cavity and 1873.33 N (191.16 kgf) for the adjacent hole. The statistical analysis showed that the bending resistance of the adjacent holes was significantly lower than that of the intact teeth (P <0.001), followed by that of the adjacent cheeks (ridges) was lower than that of the complete teeth (P <0.05) However, the bending resistance of the buccal (tongue) cavity was significantly higher than that of the adjacent hole (p <0.05). Conclusion The conformality of the buccal (tongue) cavity is better than that of the adjacent hole.