Effects of Surface Pretreatments on Bond Strength and Morphology of Aprismatic Enamel.

IF 4.6 Q2 MATERIALS SCIENCE, BIOMATERIALS ACS Applied Bio Materials Pub Date : 2022-10-18 DOI:10.3290/j.jad.b3240701

Allegra Comba, Andrea Baldi, Martina Garavelli, Tatjana Maravic, Lorenzo Breschi, Annalisa Mazzoni, Claudia Mazzitelli, Nicola Scotti

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Abstract

Purpose: To evaluate the effect of different pretreatment protocols and adhesives on the shear bond strength and surface morphology of aprismatic enamel.

Materials and methods: Human maxillary incisors (N = 120) were assigned to five different groups according to pretreatment: 1) no treatment; 2) glycine; 3) sodium bicarbonate; 4) Al2O3 and 5) extra-fine bur. Then the teeth were divided into three subgroups, according to the adhesive applied: 3-step etch-and-rinse (ER), universal adhesive in ER mode, and universal adhesive in self-etch (SE) mode. Shear bond strength (SBS) testing was performed with a universal testing machine. For SEM observation, fifteen human molars were collected and analyzed after pretreatment with/without etching with 37% H3PO4 for 30s.

Results: Al2O3 showed higher SBS than all other groups considered. Comparable SBS values were obtained for other pretreatments. Universal adhesive in E&R mode performed better than did 3-step E&R and universal adhesive in SE mode. SEM images showed visible differences in enamel surface roughness.

Conclusions: Airborne-particle abrasion with Al2O3 followed by etching with H3PO4 increased SBS on aprismatic enamel. The combination of airborne-particle abrasion with alumina powder followed by 15 s of H3PO4 etching and application of a universal adhesive in E&R mode proved to be the most effective adhesive protocol.

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表面预处理对杏仁釉粘接强度和形态的影响

目的：评估不同的预处理方案和粘合剂对棱镜釉的剪切结合强度和表面形态的影响：1）无处理；2）甘氨酸；3）碳酸氢钠；4）Al2O3；5）超细毛刺。然后根据所使用的粘合剂将牙齿分为三个亚组：三步蚀刻-冲洗（ER）、ER 模式下的通用粘合剂和自蚀刻（SE）模式下的通用粘合剂。使用万能试验机进行剪切粘接强度（SBS）测试。为了进行扫描电子显微镜观察，收集了 15 颗人类臼齿，并对经过 37% H3PO4 蚀刻 30 秒预处理/未经过 37% H3PO4 蚀刻预处理的臼齿进行了分析：结果：Al2O3 的 SBS 值高于所有其他组别。其他预处理的 SBS 值相当。E&R 模式下的通用粘合剂比 3 步 E&R 和 SE 模式下的通用粘合剂性能更好。SEM 图像显示了珐琅质表面粗糙度的明显差异：结论：先用 Al2O3 进行气载微粒研磨，再用 H3PO4 进行蚀刻，可提高棱镜形搪瓷上的 SBS。事实证明，在 E&R 模式下，氧化铝粉末的气载颗粒磨蚀和 15 秒的 H3PO4 蚀刻以及通用粘合剂的结合使用是最有效的粘合方案。

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