Pucci César R, Barbosa Natália R, Bresciani Eduardo, Yui Karen Ck, Huhtala Maria Filomena Rl, Barcellos Daphne C, Torres Carlos Rg
Department of Restorative Dentistry, Institute of Science and Technology, Universidade Estadual Paulista - UNESP São Paulo, Brazil.
Department of Restorative Dentistry, São José dos Campos School of Dentistry, Universidade Estadual Paulista - UNESP São Paulo, Brazil.
J Contemp Dent Pract. 2016 Dec 1;17(12):985-989.
The decalcification protocol of dentin surface with sodium hypochlorite removes the exposed collagen fibrils and could improve the longevity of the bonding interface. This study evaluated the influence of collagen removal with 10% sodium hypochlorite (10% NaOCl) on the longitudinal shear bond strength (SBS) of adhesives to dentin.
Seventy-two extracted human molars were sectioned and the buccal and lingual surfaces were flattened and acid etched with 37% phosphoric acid for 15 seconds. The specimens were divided into six groups (n = 12 teeth - 24 sections), according to adhesive and collagen removal protocol: group 1: UNO Dentastic; group 2: Prime and Bond NT; group 3: Single Bond; group 4: 10% NaOCl + UNO Dentastic; group 5: 10% NaOCl + Prime and Bond NT; group 6: 10% NaOCl + Single Bond. Composite Z100 buildup was prepared, and the SBS test was assessed after 24 hours and 1 year. Data were submitted to three-way analysis of variance (ANOVA) and Tukey tests (p < 0.05).
The mean values (MPa) were for 24 hours: G1: 22.45; G2: 7.90; G3: 12.56; G4: 19.85; G5: 33.73; G6: 20.77; and for 1 year: G1: 2.43; G2: 2.26; G3: 4.3; G4: 18.79; G5: 26.49; G6: 22.73.
Dentin deproteinization treatment with 10% NaOCI influenced the SBS compared with conventional treatment. The negative influence on SBS detected for conventional groups at 1-year interval was not detected for deproteinized groups.
The longevity of hybrid layer is critical due to the hydrolysis process at the adhesive interface over time. The use of 10% NaOCl deproteinization protocol might improve the longevity of bonding in adhesive restorations.
用次氯酸钠对牙本质表面进行脱钙处理可去除暴露的胶原纤维，并可能提高粘结界面的耐久性。本研究评估了用10%次氯酸钠（10% NaOCl）去除胶原对粘结剂与牙本质纵向剪切粘结强度（SBS）的影响。
将72颗拔除的人磨牙进行切片，将颊面和舌面磨平，并用37%磷酸酸蚀15秒。根据粘结剂和胶原去除方案，将标本分为六组（n = 12颗牙 - 24个切片）：第1组：UNO Dentastic；第2组：Prime and Bond NT；第3组：Single Bond；第4组：10% NaOCl + UNO Dentastic；第5组：10% NaOCl + Prime and Bond NT；第6组：10% NaOCl + Single Bond。制备复合树脂Z100堆积体，并在24小时和1年后评估SBS试验。数据进行三因素方差分析（ANOVA）和Tukey检验（p < 0.05）。
24小时时的平均值（MPa）为：第1组：22.45；第2组：7.90；第3组：12.56；第4组：19.85；第5组：33.73；第6组：20.77；1年后为：第1组：2.43；第2组：2.26；第3组：4.3；第4组：18.79；第5组：26.49；第6组：22.73。
与传统处理相比，用10% NaOCI进行牙本质脱蛋白处理会影响SBS。脱蛋白组在1年间隔时未检测到传统组中检测到的对SBS的负面影响。
由于随着时间推移粘结界面处的水解过程，混合层的耐久性至关重要。使用10% NaOCl脱蛋白方案可能会提高粘结修复体中粘结的耐久性。
