高强度玻璃纤维舌侧固定保持器的应用研究

目的探讨高强度玻璃纤维复合树脂的力学性能及其在临床应用中对牙周状况的影响。方法将结束正畸治疗的60例患者随机分为玻璃纤维组和麻花丝组,分别采用高强度玻璃纤维复合树脂及不锈钢麻花丝制作舌侧固定保持器进行保持,在粘接后即刻、6、12个月对患者的牙龈出血指数和牙周探针深度进行检测,并对高强度玻璃纤维复合树脂和不锈钢麻花丝的弹性模量和最大抗剪切力进行检测。结果玻璃纤维组和麻花丝组在粘接6、12个月时的牙龈出血指数高于粘接即刻,其差异有统计学意义（P<0.05）,而牙周探诊深度间的差异无统计学意义（P>0.05）;粘接即刻、6、12个月时,玻璃纤维组和麻花丝组间的牙周探诊深度、牙龈出血指数间的差异均无统计学意义（P>0.05）。力学性能检测发现,高强度玻璃纤维试件的最大抗剪切力和弹性模量均低于麻花丝试件（P<0.001）。结论在利用高强度玻璃复合树脂临床便捷性的同时,必须注意其对口腔卫生造成的影响,并适当改进粘接方式,增强其抗剪切强度,以更好地满足临床需要。

Application of fiber-reinforced composite as fixed lingual retainer

Objective To investigate mechanic properties of fiber-reinforced composite（FRC） and its influence on maintaining periodontal health. Methods Sixty patients completing orthodontic treatment were randomized into two groups with FRC and multistrand stainless steel wire（MSSW） being applied as fixed lingual retainer. Bleeding index （BI） and pocket depth（PD） were recorded right after, 6 months and 12 months after bonding the retainer. Flexural modulus and maximum shear bond strength were tested for FRC and MSSW. Results Statistical significance was found at the increase of BI from right after bonding, 6 months after to 12 months after for both groups（P<0.05）, while no statistically significant change was found in PD among the three time points（P >0.05）. There were no difference between the two groups at each time point regarding BI and PD（P >0.05）. The flexural modulus and maximum shear bond strength of FRC were both below to that of MSSW under the same test situation（P<0.001）. Conclusion It is necessary to improve the bonding strength of FRC and reduce its negative effect on periodontal health in addition to its advantage of convenience.