底板带有通孔的托槽GC粘结的剪切强度研究

发布时间：2018-06-15 17:48

本文选题：托槽底板 + 树脂加强型玻璃离子　；参考：《山东大学》2017年硕士论文

【摘要】：目的临床上应用的光固化类的托槽粘结剂会受到固化深度的影响。为改善金属托槽的透光性,提高金属托槽的早期粘结强度,我们设计了一种底板带有通孔的金属托槽。本研究对底板带有通孔的金属托槽与常规网状底板金属托槽应用GC(树脂增强型玻璃离子)粘接光固化后即刻及10至15分钟的抗剪切强度及托槽脱落后牙面上粘结剂残留指数进行对照研究,为该新型托槽的改进与临床应用提供实验依据和参考。材料与方法选取临床上因正畸需要而拔除的人离体上颌第一前磨牙4 0颗,随机分为A1、A2、B1、B2共4组,每组10颗。A1、A2组选用杭州星辰三比齿科器材有限公司生产的上颌第一前磨牙滑动网底直丝弓托槽,B1、B2组托槽选用杭州星辰三比齿科器材有限公司生产的上颌第一前磨牙滑动网底直丝弓托槽,并用高速涡轮车针在托槽底板上制备贯通底板全层的3个通孔。各组托槽均采用GC(树脂增强型玻璃离子)进行粘结。A1、B1组托槽在粘接光固化1分钟至2分钟应用万能材料力学实验机,测试并记录每组试件的抗剪切力;A2、B2组在光固化10到15分钟进行测试并记录每组试件的抗剪切力,根据托槽的底板面积,分别计算出抗剪切强度。托槽脱落后记录牙釉质表面的粘接剂残留指数。结果①A1、B1组,A1、A2组剪切强度差异有统计学意义,A2、B2组,B1、B2组抗剪切强度无统计学意义。②制备有通孔的托槽无论在1分钟至2分钟或是10至15分钟的ARI分值均明显低于传统滑动直丝弓托槽。这说明托槽制作通孔后可明显增加粘结剂与托槽的粘接强度,与常规托槽相比其断裂部位更多发生在粘结剂与釉质界面。结论①托槽应用GC粘接初期,托槽粘接强度明显偏低,但底板带有通孔的托槽粘接强度明显提高。②仅在底板边缘制备3个通孔的托槽在10至15分钟粘接强度与常规托槽差异无统计学意义。尚不能完全满足临床需要,有必要在底板中心等部位制备更多通孔作进一步研究。③托槽应用GC粘接时,粘固时间对粘接强度有较大影响。24小时完全固化后再进行弓丝的结扎是有必要的。④对托槽脱落再次粘结后不需更换弓丝的患者,医师多即时结扎,建议托槽脱落再次粘结时使用该带有透光通孔的托槽。⑤B1、B2组的ARI积分明显低于A1、A2组,这表明,在托槽底板上制备通孔后,托槽与粘接剂之间的结合力有明显增强。提示临床上托槽脱落后,托槽上粘接剂较少时,采用底板带有通孔的托槽可提高粘接效果。⑥打孔的位置和数目对光固化粘接剂的粘接效果有影响。通过在托槽上打孔增加透光性对增强光固化粘结剂早期的抗剪切强度是有意义的,为使粘结效果在早期达到临床要求,有必要对打孔的位置(如托槽中心)及数量等作进一步的研究,并运用3D打印技术等制作统一标准化的试件进行更加完善的体外实验和临床效果观察。为其推广应用提供可靠的理论依据。
[Abstract]:Objective to evaluate the effect of curing depth on light-cured bracket binders. In order to improve the transmittance of metal brackets and improve the early bonding strength of metal brackets, we designed a metal bracket with through holes on the bottom plate. Application of GC- (Resin-Enhanced Glass Ions) to Metal brackets with through holes on the floor of the floor the Shear strength and the bonding on the Surface of the Tooth immediately after the Light curing and 10 to 15 minutes after the brackets fall off The drug residue index was compared. To provide experimental basis and reference for the improvement and clinical application of the new bracket. Materials and methods Forty maxillary first premolars were selected and randomly divided into 4 groups, A _ (1) A _ (2) B _ (1) B _ (1) B _ (2) group. Each group of 10. A1A _ 2 group selected the maxillary first premolars sliding net bottom straight wire arch bracket B _ 1 and B _ 2 group brackets produced by Hangzhou Xingchen Sanbi Dental equipment Co., Ltd. The maxillary first anterior grinding made by Hangzhou Xingchen Sanbi Dental equipment Co., Ltd. Tooth sliding mesh bottom straight wire arch bracket, Three holes through the whole layer of the bottom plate were prepared by using the high speed turbine needle on the bottom plate of the bracket. All the brackets were bonded by GC- (Resin-Enhanced Glass Ion). Group A _ (1) B _ (1) was cured by light for 1 to 2 minutes, and the universal material mechanics test machine was used. The shear resistance of each group of specimens was measured and recorded. The shear strength of each group of specimens was measured and recorded during 10 to 15 minutes of light curing. The shear strength was calculated according to the floor area of the bracket. The residual index of adhesive on enamel surface was recorded after the bracket was removed. Results there was significant difference in shear strength between A _ 1 and A _ 1 A _ 2 group. The ARI score of the through hole bracket was significantly lower than that of the A _ 2B _ 2 group and B _ 1 / B _ 2 group, whether in 1 to 2 minutes or 10 to 15 minutes, no significant difference was found in the shear strength of A _ 2 / B _ 2 group and B _ 1 / B _ 2 group. Traditional sliding straight wire bow bracket. This indicates that the bonding strength between the binder and the bracket can be increased obviously after the through hole of the bracket is made, and the fracture position of the bracket is more often at the interface between the binder and the enamel than that of the conventional bracket. Conclusion (1) in the early stage of GC bonding, the bonding strength of bracket is obviously lower than that of GC. However, the bonding strength of the bracket with through holes on the bottom plate was significantly increased .2 there was no significant difference in the bonding strength between 10 and 15 minutes between the three through holes made at the edge of the bottom plate and the conventional bracket. It is necessary to make more holes in the center of the bottom plate and other parts for further study when applying GC bonding to the 3. 3 brackets. The bonding time has a great influence on the bonding strength. It is necessary to ligate the arch wire after 24 hours of complete solidification. It is necessary for the patients who do not need to change the bow wire after the bracket falls off and binds again. It is suggested that the ARI integral of the bracket with transparent through hole in group 5B1OB2 is obviously lower than that in group A _ 1A _ 2 when the bracket falls off and binds again, which indicates that after the through hole is prepared on the bottom plate of the bracket, the bonding force between the bracket and the adhesive is obviously enhanced. It is suggested that the position and number of holes in the bottom plate with through hole can improve the bonding effect of light curing adhesive when the clinical bracket falls off and the adhesive on the bracket is less. It is significant to enhance the early shear strength of the light curing binder by perforating holes in the bracket, in order to make the bonding effect reach the clinical requirement at the early stage. It is necessary to further study the location and number of holes (such as the center of the bracket), and to make standardized specimens with 3D printing technology for more perfect in vitro experiments and clinical observation. It provides a reliable theoretical basis for its popularization and application.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：R783.5

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