Effectiveness of self-adhesive luting cements in bonding to chlorhexidine-treated dentin

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• 作者：Vinicius Di Hipó ; lito^a ; ^{vdhipolito@yahoo.com.br} ; Flá ; via Pires Rodrigues^a ; Fabiana Bá ; rbara Piveta^a ; Lí ; dia da Cunha Azevedo^a ; Roberta Caroline Bruschi Alonso^a ; Nick Silikas^b ; Ricardo Marins Carvalho^c ; Mario Fernando De Goes^d ; Paulo Henrique Perlatti D’ ; Alpino^a
• 关键词：Chlorhexidine ; Bond-strength ; Self-adhesive luting cement
• 刊名：Dental Materials
• 出版年：2012
• 期刊代码：29_01095641
• 类别：ms
• 出版时间：May, 2012
• 卷：28
• 期：5
• 页码：495-501
• 文件大小：860 K

摘要

lass="h4">Objectives

The aim was to investigate the microtensile bond strength (渭-TBS) and failure pattern of self-adhesive luting cements (SLC) to dentin pre-treated with different concentrations of chlorhexidine (CHX) solutions.

lass="h4">Methods

The occlusal enamel was removed from 30 extracted sound human molars in order to expose a flat dentin. Resin-composite (Filtek Z250, 3 M ESPE) discs (12 mm in diameter, 6.0 mm thickness) were cemented to the smear layer-covered dentin using the SLC [RelyX U100, 3 M ESPE (U100); Multilink Sprint, Ivoclar Vivadent (MS)] with 0.2%or 2.0%CHX solutions. Results were compared with the control, untreated dentin. Six groups were then created based on the SLC and dentin pre-treatment (n = 5). After 24 h of water storage, restored teeth were serially sectioned into beams with a cross-sectional area of 0.8 mm² at the bonded interface. Subsequently, specimens were tested in tension with a crosshead speed of 0.5 mm/min in a universal testing machine, and the failure patterns were classified. Two-way ANOVA and Tukey's tests were performed (伪 = 0.05). Additionally, 18 teeth were subjected to energy-dispersive X-ray spectroscopy (EDS) analysis and micromorphology characterization of the smear layer-covered dentin and 0.2%or 2.0%CHX-treated dentin surfaces.

lass="h4">Results

The 渭-TBS obtained for both control groups were significantly higher, regardless of the CHX concentration and/or the cement used. Bond strengths were significantly higher for U100 than for MS, except when 2.0%CHX was applied. Fractographic analysis indicated that most failures in the control groups occurred cohesively in the SLC. Pre-treated dentin with 0.2%and 2.0%CHX solutions presented higher incidences of adhesive failures. EDS/SEM analysis exhibited varied concentrations of chlorine ions and crystal-shaped precipitates, depending upon the CHX concentration.

lass="h4">Significance

Pre-treatment of dentin with 0.2%or 2.0%CHX adversely affects the bonding efficacy when associated with the SLCs tested.