Abstract:

Objective To evaluate the mechanical properties and bacterial adhesion of the glass fiber-reinforced composite resin space maintainer.Methods The mechanical properties of the composite resin high-strength fiber （experimental group） and the band and loop type （control group） space maintainer were tested by universal material testing machine. The two types of space maintainer were placed on a plate with a strain of Streptococcus mutans. Scanning electron microscopy and viable cell counts were used to observe bacterial attachment.Results There was no significant difference in the maximum shear resistance between the experimental group（32.02 ± 4.315）N and the control group （33.35 ± 5.154）N space maintainer （P > 0.05）. Scanning electron microscope showed that streptococcal bacteria were attached to the surface of the two groups. The colony count quantity of the experimental group （10.02 ± 2.315） ×10⁴ CFU/mL was decreased compared with that of the control group （14.35 ± 2.154） ×10⁴ CFU/mL. The difference was statistically significant （P < 0.05）.Conclusion The composite resin high-strength fiber and the band and loop type space maintainer have comparable mechanical strength; however, the composite resin high-strength fiber bacteria adheres less than the band and loop type, and the self-cleaning function is relatively good.

Key words: early loss of primary molars, space maintainer, composite resin high-strength fiber, band and loop, mechanical properties, bacterial adhesion, self-cleaning function

摘要：

目的 评估复合树脂高强纤维缺隙保持器力学性能及细菌附着情况。方法 应用万能材料试验机对复合树脂高强纤维（实验组）和带环丝圈式（对照组）缺隙保持器的力学性能进行检测;将两种缺隙保持器置于变形链球菌菌株培养板中应用扫描电镜和活细胞计数观察细菌附着情况。结果 最大抗剪切力比较,实验组（32.02 ± 4.315）N与对照组（33.35 ± 5.154）N缺隙保持器材料差异无统计学意义（P＞0.05）;扫描电镜显示两组表面均附着类似链球菌样细菌,实验组菌落计数定量（10.02 ± 2.315） × 10⁴ CFU/mL较对照组表面细菌数量（14.35 ± 2.154） × 10⁴ CFU/mL少,差异有统计学意义（P＜0.05）。 结论 复合树脂高强纤维与带环丝圈式缺隙保持器具有可比拟的机械强度;但复合树脂高强纤维细菌附着数量少于带环丝圈式,自洁功能相对好。

关键词: 乳磨牙早失, 缺隙保持器, 复合树脂高强纤维, 带环丝圈, 力学性能, 细菌附着, 自洁功能