de Araújo Diana Ferreira Gadelha, Chaves Larissa Pinceli, Bim Odair, Pimentel Garcia Fernanda Cristina, Ishikiriama Sérgio Kiyoshi, Honório Heitor Marques, Wang Linda
Department of Operative Dentistry, Endodontics and Dental Materials, Bauru School of Dentistry, University of São Paulo, Bauru, SP, Brazil.
Department of Restorative Dentistry, Dental Materials Area, University of Brasília-UnB, DF, Brazil.
J Dent. 2014 Jun;42(6):735-41. doi: 10.1016/j.jdent.2014.02.019. Epub 2014 Mar 5.
This study evaluated the influence of 2% chlorhexidine digluconate (CHX) on the bond strength (BS) of a glass-fibre post to the root canal, regarding the cements (dual-cured resin or resin-modified glass-ionomer cement), the root thirds and the time of storage.
Eighty bovine roots were selected and endodontically treated, before being randomly assigned to the following groups according to the luting protocol: ARC (RelyX ARC); ARC+CHX; RL (RelyX Luting 2); and RL+CHX. After 24 h of luting, the roots were sliced to obtain 1 mm-thick slices. Half of each group was submitted to either 7-day or 6-month storage in artificial saliva (n=10). The specimens were subjected to push-out tests with a crosshead speed of 0.5 mm/min. The data were analysed with four-way ANOVA and Tukey's test (P≤0.05). The failure modes were analysed with a digital microscope (50× and 200×).
ARC yielded a significantly higher BS compared to RL (P<0.001). Despite CHX exerted a significant effect; it depends on the interaction with the luting cement and time (P<0.001). Thus, CHX decreased the values of BS to those of ARC after 6 months (P<0.001). On the 7th day of storage, the ARC+CHX presented higher BS to the cervical and middle thirds compared to RL+CHX (P=0.012). Time solely was not a significant factor (P=0.081). Adhesive cement-dentine type and mixed failures were predominant modes for the ARC groups. For the RL groups, the main failures were adhesive cement-post and mixed modes.
Glass-fibre posts luted with RelyX ARC dual-cure resin cement exhibited higher BS than those luted with RelyX Luting 2 resin-modified glass-ionomer cement. Furthermore, CHX was not effective to improve the BS and negatively affected the BS of RelyX ARC after 6 months of storage.
The use of chlorhexidine solution seems not to improve the bond strength of fibre posts to root canals, disregarding the composition of the luting cement.
本研究评估了2%葡萄糖酸氯己定（CHX）对玻璃纤维桩与根管粘结强度（BS）的影响，涉及粘结剂（双固化树脂或树脂改性玻璃离子水门汀）、牙根三段以及储存时间。
选取80颗牛牙根进行根管治疗，然后根据粘结方案随机分为以下几组：ARC（RelyX ARC）；ARC+CHX；RL（RelyX Luting 2）；RL+CHX。粘结24小时后，将牙根切片制成1毫米厚的薄片。每组的一半样本在人工唾液中储存7天或6个月（n=10）。对样本进行推出试验，十字头速度为0.5毫米/分钟。数据采用四因素方差分析和Tukey检验（P≤0.05）。用数码显微镜（50×和200×）分析失败模式。
与RL相比，ARC的粘结强度显著更高（P<0.001）。尽管CHX有显著影响，但这取决于其与粘结剂和时间的相互作用（P<0.001）。因此，储存6个月后，CHX使粘结强度值降至ARC的水平（P<0.001）。在储存第7天时，ARC+CHX与RL+CHX相比，在颈段和中段的粘结强度更高（P=0.012）。单独的时间不是一个显著因素（P=0.081）。对于ARC组，粘结剂-牙本质型和混合型失败是主要模式。对于RL组，主要失败模式是粘结剂-桩型和混合型。
用RelyX ARC双固化树脂粘结剂粘结的玻璃纤维桩比用RelyX Luting 2树脂改性玻璃离子水门汀粘结的桩具有更高的粘结强度。此外，CHX对提高粘结强度无效，且在储存6个月后对RelyX ARC的粘结强度有负面影响。
无论粘结剂的成分如何，使用氯己定溶液似乎都不能提高纤维桩与根管的粘结强度。
