Arima Valter O, Vedovello Mario, Valdrighi Heloísa C, Lucato Adriana S, Santamaria Milton, Vedovello Silvia A S
UNIARARAS, Fundação Hermínio Ometto (Araras/SP, Brasil).
Dental Press J Orthod. 2017 Jul-Aug;22(4):34-40. doi: 10.1590/2177-6709.22.4.034-040.oar.
: To evaluate the shear bond strength of lingual orthodontic brackets with resin or metal pads, the location of bond failure and the adhesive remnant index (ARI).
: A total of 40 extracted upper premolars were randomly divided into two groups of 20 each: bonding with brackets having (1) pads with extended resin directly on the lingual surface of teeth, and (2) pads with metal custom base on the lingual surface of teeth. The debonding force was measured with an Instron universal testing machine. A Student's t-test was used to assess the difference between groups (α = 0.05).
: The results showed a significant difference between the groups (p < 0.001). The shear bond strength of metal pads was significantly higher than resin pads.
: Within the limitations of this in vitro study, it was concluded that the bond strength of lingual brackets with metal pads was higher than that of brackets with composite resin pads, due to the metal part being a single unit and welded. The failure location in the region between the bracket and the resin pad affected a higher percentage of the resin pads than the metal pads.
评估带有树脂或金属衬垫的舌侧正畸托槽的剪切粘结强度、粘结失败位置及粘结剂残留指数（ARI）。
将40颗拔除的上颌前磨牙随机分为两组，每组20颗：（1）使用托槽粘结，托槽带有直接在牙齿舌面的延伸树脂衬垫；（2）使用托槽粘结，托槽带有定制金属基底在牙齿舌面。用Instron万能试验机测量脱粘力。采用学生t检验评估两组间差异（α = 0.05）。
结果显示两组间存在显著差异（p < 0.001）。金属衬垫的剪切粘结强度显著高于树脂衬垫。
在本体外研究的局限性内，得出结论：带有金属衬垫的舌侧托槽的粘结强度高于带有复合树脂衬垫的托槽，因为金属部分是一个整体且焊接而成。托槽与树脂衬垫之间区域的失败位置在树脂衬垫中所占比例高于金属衬垫。
