Influence of 10% sodium ascorbate gel application time on composite bond strength to bleached enamel.

Acta Biomaterialia Odontologica Scandinavica Pub Date : 2016-03-04 eCollection Date: 2016-12-01 DOI:10.3109/23337931.2016.1152901

Cintia Gaio Murad, Suellen Nunes de Andrade, Lucio Ramos Disconzi, Eliseu Aldrighi Munchow, Evandro Piva, Renata Correa Pascotto, Sandra Kiss Moura

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引用次数: 17

Abstract

Objective To analyze bond strength to bleached enamel following application of 10% sodium ascorbate gel. Material and methods Forty third molars were allocated into five groups (n = 8): GP - unbleached specimens restored with composite resin; GN - specimens restored immediately after bleaching; and G15; G30 and G60 (test groups) - bleached specimens treated with 10% sodium ascorbate gel for 15, 30 and 60 min before restoration. The teeth were sectioned and the buccal and lingual faces were restored. After storage in distilled water (37 °C/24 h), sticks of ±0.8 mm² were tested in tensile (0.5 mm/min). Fractures were observed and classified. Data (in MPa) were analyzed with one-way ANOVA and Tukey tests (α = 0.05). Results No differences were found among GP (26 ± 6.0), G15 (23 ± 7.3), G30 (25 ± 6.1) and G60 (25 ± 5.1), with GN (15 ± 5.5) showing the lowest bond strength (p < 0.0001). Conclusion The application of 10% sodium ascorbate gel for 15 min after bleaching with 37.5% hydrogen peroxide restored the bonding to enamel.

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10%抗坏血酸钠凝胶应用时间对漂白牙釉质复合粘结强度的影响。

目的分析10%抗坏血酸钠凝胶对漂白牙釉质的粘结强度。材料与方法将43颗磨牙分为5组(n = 8):用复合树脂修复GP -未漂白标本;GN -漂白后立即修复的标本;和G15;G30和G60(试验组)-在修复前用10%抗坏血酸钠凝胶处理漂白标本15、30和60分钟。切除牙齿，修复颊面和舌面。在蒸馏水(37°C/24 h)中储存后，测试±0.8 mm2的棒材的拉伸(0.5 mm/min)。观察骨折并分类。数据(单位MPa)采用单因素方差分析和Tukey检验(α = 0.05)。结果GP(26±6.0)、G15(23±7.3)、G30(25±6.1)、G60(25±5.1)之间黏结强度无显著差异，GN(15±5.5)黏结强度最低(p < 0.0001)。结论用37.5%过氧化氢漂白牙体后，应用10%抗坏血酸钠凝胶15 min，可恢复牙体与牙釉质的结合。

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Acta Biomaterialia Odontologica Scandinavica

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