Rock W P, Abdullah M S
School of Dentistry, University of Birmingham, UK.
J Dent. 1997 May-Jul;25(3-4):243-9. doi: 10.1016/s0300-5712(97)00022-5.
To test the shear bond strengths obtained when orthodontic brackets were bonded ex vivo using a composite resin and a compomer orthodontic adhesive.
Specimens were tested in a special jig made to fit an Instron testing machine. After debonding, the adhesive remaining on bracket bases and enamel surfaces was mapped.
Bond strengths ranged from 8 to 23 MPa with the composite resin producing higher strengths than the compomer for similar combinations of variables. Bond strength was increased by longer curing and a longer debond interval and was higher for brackets with mesh bases than undercut bases. More compomer remained on the enamel surface after debonding than did the composite resin.
The compomer produced bond strengths within the range considered to be clinically acceptable in other studies. If it was clinically successful as an orthodontic adhesive a compomer would confer the advantage that fluoride release would help to minimize the onset of early caries around bonded brackets.
测试使用复合树脂和聚酸改性复合树脂正畸粘合剂在体外粘结正畸托槽时获得的剪切粘结强度。
在为适配英斯特朗测试机而制作的特殊夹具中对标本进行测试。脱粘后，绘制残留在托槽基底和牙釉质表面的粘合剂分布图。
粘结强度范围为8至23兆帕，对于类似的变量组合，复合树脂产生的强度高于聚酸改性复合树脂。固化时间延长和脱粘间隔时间延长会提高粘结强度，带有网底的托槽的粘结强度高于有倒凹基底的托槽。脱粘后，留在牙釉质表面的聚酸改性复合树脂比复合树脂更多。
聚酸改性复合树脂产生的粘结强度在其他研究中认为临床可接受的范围内。如果作为正畸粘合剂在临床上取得成功，聚酸改性复合树脂将具有氟释放有助于使粘结托槽周围早期龋齿的发生最小化的优势。
