Marcos Regina Maria Helen-Cot, Kinder Gustavo Ross, Alfredo Edson, Quaranta Tarcisio, Correr Gisele Maria, Cunha Leonardo Fernandes da, Gonzaga Carla Castiglia
Graduate Program in Dentistry, UP - Universidade Positivo, Curitiba, PR, Brazil.
Braz Dent J. 2016 Sep-Oct;27(5):592-598. doi: 10.1590/0103-6440201600886.
The objective of the present study was to evaluate the influence of resin cement thickness on the bond strength of prefabricated and customized glass fiber posts after storage in distilled water. Thirty human uniradicular roots were treated endodontically. The roots were divided into 3 groups: THIN (thin cement layer) - post space preparation with #0.5 drill and cementation of #0.5 post; THICK (thick cement layer) - post space preparation with #1 drill and cementation of #0.5 post; and CUSTOM (customized cement layer) - post space preparation with #1 drill and cementation of a customized post (#0.5 glass fiber posts customized with resin composite). All posts were luted with self-adhesive resin cement. The push-out test was carried out after storage for 24 h and 90 days in distilled water at 37 °C. The data were analyzed with three-way ANOVA and Tukey's test (a=0.05). Bond strengths were significantly higher for CUSTOM (9.37 MPa), than for THIN (7.85 MPa) and THICK (7.07 MPa), which were statistically similar. Considering the thirds, the bond strength varied in the sequence: apical (7.13 MPa) < middle (8.22 MPa) = coronal (8.94 MPa). Bond strength for 24 h storage was significantly higher (8.80 MPa) than for 90-day storage (7.40 MPa). It may be concluded that the thickness of resin cement influenced the bond strength of glass fiber posts. The customized posts presented higher bond strength. Storage in water for 90 days affected negatively the values of bond strength, especially for thick cement layers in the apical third.
本研究的目的是评估树脂水门汀厚度对预制和定制玻璃纤维桩在蒸馏水中储存后的粘结强度的影响。选取30颗人单根牙进行根管治疗。将牙根分为3组：THIN（薄水门汀层）组——用#0.5钻制备桩道并粘结#0.5桩；THICK（厚水门汀层）组——用#1钻制备桩道并粘结#0.5桩；CUSTOM（定制水门汀层）组——用#1钻制备桩道并粘结定制桩（用树脂复合材料定制的#0.5玻璃纤维桩）。所有桩均用自粘结树脂水门汀粘结。在37℃蒸馏水中储存24小时和90天后进行推出试验。数据采用三因素方差分析和Tukey检验（α=0.05）进行分析。CUSTOM组（9.37MPa）的粘结强度显著高于THIN组（7.85MPa）和THICK组（7.07MPa），后两组在统计学上相似。按牙根三段考虑，粘结强度顺序为：根尖段（7.13MPa）＜中段（8.22MPa） = 冠段（8.94MPa）。储存24小时后的粘结强度（8.80MPa）显著高于储存90天后的粘结强度（7.40MPa）。可以得出结论，树脂水门汀的厚度影响玻璃纤维桩的粘结强度。定制桩具有更高的粘结强度。在水中储存90天对粘结强度值有负面影响，尤其是根尖段厚水门汀层的情况。
