Oliveira Sofia S A, Pugach Megan K, Hilton Joan F, Watanabe Larry G, Marshall Sally J, Marshall Grayson W
Department of Preventive and Restorative Dental Sciences, University of California, 707 Parnassus Avenue D2246, San Francisco, CA 94143-0758, USA.
Dent Mater. 2003 Dec;19(8):758-67. doi: 10.1016/s0109-5641(03)00023-x.
To determine the effect of dentin smear layers created by various abrasives on the adhesion of a self-etching primer (SE) and total-etch (SB) bonding systems.
Polished human dentin disks were further abraded with 0.05 micro m alumina slurry, 240-, 320- or 600-grit abrasive papers, # 245 carbide, # 250.9 F diamond or # 250.9 C diamond burs. Shear bond strength (SBS) was evaluated by single-plane lap shear, after bonding with SE or SB and with a restorative composite. Smear layers were characterized by thickness, using SEM; surface roughness using AFM; and reaction to the conditioners, based on the percentage of open tubules, using SEM.
Overall, SBS was lower when SB was used than when SE was used. SBS decreased with increasing coarseness of the abrasive in the SE group. Among burs, the carbide group had the highest SBS, and 320- and 240-grit papers had SBS close to the carbide group. Surface roughness and smear layer thickness varied strongly with coarseness. After conditioning with SE primer, the tubule openness of specimens abraded by carbide bur did not differ from 240- or 320-grit paper, but did differ from the 600-grit.
Even though affected by different surface preparation methods, SE yielded higher SBS than SB. The higher SBS and thin smear layer of the carbide bur group, suggests its use when self-etching materials are used in vivo. Overall, the 320-grit abrasive paper surface finish yielded results closer to that of the carbide bur and its use is recommended in vitro as a clinical simulator when using the SE material.
确定不同磨料形成的牙本质玷污层对自酸蚀底漆（SE）和全酸蚀（SB）粘结系统粘结力的影响。
用0.05μm氧化铝浆液、240目、320目或600目砂纸、#245硬质合金、#250.9F金刚石或#250.9C金刚石车针进一步研磨抛光后的人牙本质盘。在与SE或SB以及修复性复合材料粘结后，通过单平面搭接剪切评估剪切粘结强度（SBS）。用扫描电子显微镜（SEM）测定玷污层厚度来表征玷污层；用原子力显微镜（AFM）测定表面粗糙度；用SEM根据开放牙本质小管的百分比测定对调节剂的反应。
总体而言，使用SB时的SBS低于使用SE时。在SE组中，SBS随磨料粗糙度增加而降低。在车针中，硬质合金组的SBS最高，320目和240目砂纸的SBS与硬质合金组相近。表面粗糙度和玷污层厚度随粗糙度变化很大。用SE底漆处理后，用硬质合金车针研磨的标本的牙本质小管开放度与用240目或320目砂纸研磨的标本无差异，但与600目砂纸研磨的标本不同。
尽管受不同表面处理方法影响，但SE产生的SBS高于SB。硬质合金车针组较高的SBS和较薄的玷污层表明，在体内使用自酸蚀材料时可使用该组。总体而言，320目砂纸表面处理的结果更接近硬质合金车针，建议在体外使用SE材料时将其作为临床模拟器。
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