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目的:比较3种不同直径的纤维桩插入相同的根管桩道预备间隙对牙根发育不完全牙修复后抗折强度的影响,为临床使用桩核系统修复根尖诱导成形术后的牙提供依据。方法:收集符合纳入标准的因正畸需要拔除的第一、二前磨牙75颗,随机分为5组。其中,实验组3组(3种不同直径的纤维桩+材料充填)、阳性对照组1组(材料桩道充填)、阴性对照组1组(根管充填后不作处理),每组样本牙各15颗,常规进行相同的桩道预备后,用不同直径的桩核系统修复,将修复后的样本牙进行包埋,采用TY-8000型电子万能测试机分别测量牙根颈1/3和中1/3区域的抗折强度,比较桩—桩道间隙的匹配对牙根抗折强度的影响。采用SAS6.0软件包对数据进行统计学处理。结果:实验组1(在桩道预备间隙中插入1.3mm的玻璃纤维桩)的牙根颈部、中部的抗折强度分别为(811±33.85)N、(681±26.64)N;实验组2(在桩道预备间隙中插入1.6mm的玻璃纤维桩)为(901±39.85)N、(729±28.77)N;实验组3(在桩道预备间隙中插入1.9mm的玻璃纤维桩)为(999±75.40)N和(799±21.77)N,阴性对照组分别为(501±38.4)、(472±22.98)N,阳性对照组分别为(704±88.39)、(550±20.14)N,对实验组1、2、3,阳性对照组和阴性对照组进行两两比较,发现在牙根的不同部位,抗折强度均有显著差异(P<0.001),且与阴性对照组有显著差异。其中,插入直径最大的1.9mm玻璃纤维桩的牙根,各部位的抗折能力最强。结论:桩道预备间隙对牙根抗折性能有显著影响,植入直径最大的1.9mm玻璃纤维桩的牙,在牙根颈1/3和中1/3区域都显示出比植入其他2种直径玻璃纤维桩的牙具有更大的抗折强度。
OBJECTIVE: To compare the effect of three kinds of different diameters of staples inserted into the same root canal on the gap between the root canal and the root canal after restoration, . Methods: A total of 75 first and second premolar teeth that need to be removed due to orthodontic inclusion were collected and randomly divided into 5 groups. Among them, three groups (three different diameters of fiber posts + material filling), one positive control group (material channel filling), one negative control group (no treatment after root canal filling), three experimental groups 15, the same routine for the preparation of the stakes, with different diameters of the post-core system repair, the repair of the sample teeth embedded, the use of TY-8000 electronic universal testing machine were measured root canal 1/3 and 1 / 3 region of the flexural strength, compared the pile - the gap of the gap on the root bending strength. SAS6.0 software package for statistical analysis of the data. Results: In the experimental group 1 (insertion of 1.3mm glass fiber posts in the pre-clearance of the stake), the flexural strength in the middle and the neck were (811 ± 33.85) N and (681 ± 26.64) N, (901 ± 39.85) N and (729 ± 28.77) N for experimental group 3 (insertion of 1.9mm glass fiber post in the pre-clearance of the stake) was (999 ± 70.40) N and (799 ± 21.77) N, respectively. The negative control group was (501 ± 38.4) and (472 ± 22.98) N respectively, and the positive control group was (704 ± 88.39) and Group 1, 2, 3, positive control group and negative control group for any comparison, found in different parts of the root, the flexural strength were significantly different (P <0.001), and the negative control group were significantly different. Among them, the insertion diameter of the largest 1.9mm fiberglass root, the most flexural capacity of each site. CONCLUSION: The clearance of prefabricated piles has a significant effect on the fracture resistance of root. The diameter of the 1.9 mm glass fiber post with the largest diameter implanted in the 1/3 and 1/3 zone of the root of the tooth showed a significant difference The glass fiber post teeth have greater flexural strength.