Smith R M, Barrett M G, Gardner W A, Marshall T, McLean M J, McMichael D W, Yerbury P J, Rawls H R
Div. of Biomaterials, UTHSCSA, School of Dentistry, San Antonio, TX 78284-7890.
Am J Dent. 1993 Jun;6(3):111-5.
This study compares the bond strength and durability of three metal surface treatments subjected to two types of environmental stress for both short- and long-term exposures. The luting resins Panavia and Comspan were applied to alumina-blasted, non-beryllium, nickel-chromium alloy coupons. Metal surface treatments consisted of either microscopic roughening by electrochemical etching, or one of two types of adhesives: a silanated silica coating (Silicoating) or a phosphate ester monomer (a component in the Panavia liquid). Shear bond strength was determined following short- or long-term exposure to either thermocycling in 6-60 degrees C water (2,672 cycles/7 days or 10,584 cycles/42 days) or storage in 37 degrees C water (7 or 42 days). Three-way ANOVA showed that both the type of environmental stress and the exposure time affected the bond strength of electroetched surfaces, but that only exposure time affected the two chemical adhesives (P < 0.05), regardless of the environmental stress used. In the short-term, the silica/silane coated surfaces produced and maintained the higher shear bond strengths (15.9 +/- 2.3 MPa). However, after 42 days the silica/silane bonds decreased 30% (to 11.3 +/- 2.2 MPa), while the phosphate ester bonds were essentially unchanged (11.4 +/- 3.0 at 4 days, 10.4 +/- 2.2 MPa at 42 days). Electroetched bonds were the weakest and decreased by 18% between 7 and 42 days in water (8.8 +/- 1.2 to 7.2 +/- 3.0 MPa) and 27% after 42 days of thermocycling (7.2 +/- 2.8 to 5.3 +/- 1.8 MPa).
本研究比较了三种金属表面处理在短期和长期暴露于两种环境应力下的粘结强度和耐久性。将粘结树脂Panavia和Comspan应用于经氧化铝喷砂处理的非铍镍铬合金试片上。金属表面处理包括通过电化学蚀刻进行微观粗糙化处理，或两种粘合剂之一：硅烷化二氧化硅涂层（Silicoating）或磷酸酯单体（Panavia液体中的一种成分）。在短期或长期暴露于6 - 60摄氏度水中的热循环（2672次循环/7天或10584次循环/42天）或在37摄氏度水中储存（7天或42天）后，测定剪切粘结强度。三因素方差分析表明，环境应力类型和暴露时间均影响电蚀刻表面的粘结强度，但仅暴露时间影响两种化学粘合剂（P < 0.05），与所使用的环境应力无关。在短期内，二氧化硅/硅烷涂层表面产生并保持了较高的剪切粘结强度（15.9±2.3 MPa）。然而，42天后，二氧化硅/硅烷粘结强度下降了30%（降至11.3±2.2 MPa），而磷酸酯粘结强度基本未变（4天时为11.4±3.0，42天时为10.4±2.2 MPa）。电蚀刻粘结强度最弱，在水中7天至42天之间下降了18%（从8.8±1.2降至7.2±3.0 MPa），热循环42天后下降了27%（从7.2±2.8降至5.3±1.8 MPa）。
