Cacciafesta Vittorio, Sfondrini Maria Francesca, Scribante Andrea, De Angelis Marco, Klersy Catherine
Department of Orthodontics, University of Insubria, Varese, Italy.
Am J Orthod Dentofacial Orthop. 2004 Aug;126(2):207-12. doi: 10.1016/j.ajodo.2003.06.022.
The purpose of this study was to assess the effect of blood contamination on the shear bond strength and failure site of 2 orthodontic primers (Transbond XT and Transbond MIP; 3M/Unitek, Monrovia, Calif) when used with adhesive-precoated brackets (APC II brackets; 3M/Unitek). One hundred twenty bovine permanent mandibular incisors were randomly divided into 8 groups; each group contained 15 specimens. Each primer-adhesive combination was tested under a different enamel surface condition: dry, blood contamination before priming, blood contamination after priming, or blood contamination before and after priming. Stainless steel APC II brackets were bonded to the teeth. After bonding, all samples were stored in distilled water at room temperature for 24 hours and subsequently tested for shear bond strength. Noncontaminated enamel surfaces had the highest bond strengths for both conventional and hydrophilic primers; their values were almost the same. Under blood-contaminated conditions, both primers showed significantly lower shear bond strengths. For each type of primer, no significant differences were reported among the blood-contaminated groups. Significant differences in debond locations were found among the groups bonded with the 2 primers under the various enamel surface conditions. Blood contamination of enamel during the bonding procedure of conventional and hydrophilic primers significantly lowers their bond strength values and might produce a bond strength that is not clinically adequate.
本研究的目的是评估血液污染对两种正畸底漆（Transbond XT和Transbond MIP；3M/Unitek，蒙罗维亚，加利福尼亚州）与预涂粘合剂托槽（APC II托槽；3M/Unitek）一起使用时的剪切粘结强度和失效部位的影响。120颗牛的永久性下颌切牙被随机分为8组；每组包含15个样本。每种底漆-粘合剂组合在不同的牙釉质表面条件下进行测试：干燥、底漆前血液污染、底漆后血液污染或底漆前后血液污染。将不锈钢APC II托槽粘结到牙齿上。粘结后，所有样本在室温下的蒸馏水中储存24小时，随后测试其剪切粘结强度。对于传统底漆和亲水底漆，未受污染的牙釉质表面具有最高的粘结强度；它们的值几乎相同。在血液污染条件下，两种底漆的剪切粘结强度均显著降低。对于每种类型的底漆，在血液污染组之间未报告显著差异。在各种牙釉质表面条件下，用两种底漆粘结的组之间在脱粘位置上发现了显著差异。在传统底漆和亲水底漆的粘结过程中，牙釉质的血液污染会显著降低它们的粘结强度值，并且可能产生临床上不足的粘结强度。
