Zuellig-Singer R, Krejci I, Lutz F
Department of Preventive Dentistry, Periodontology and Cariology, University of Zürich, Switzerland.
J Dent Res. 1992 Nov;71(11):1842-6. doi: 10.1177/00220345920710111501.
The aim of this in vitro study was to evaluate dentin adhesion after cementation of immediate direct "All Purpose" Hybrid (AP.H) composite inlays (Dentsply) and Cerec Dicor-MGC (Dentsply) inlays with the dentin adhesive Prisma Universal Bond 2 (Dentsply) and the dual-curing Dicor-MGC luting composite (Dentsply). In 24 extracted human molars, standard MOD cavities were prepared with one approximal margin located in enamel and the other one located in dentin. They were divided into four groups: (I) AP.H inlays, luting composite only, chemically cured; (II) AP.H inlays, luting composite, immediately-light-cured; (III) AP.H inlays, luting composite, initially chemically and delayed-light-cured (15 min); and (IV) MGC inlays, luting composite, initially chemically and delayed-light-cured (15 min). In vitro load cycles corresponding to five years of clinical stress followed. Initially and after specimens were loaded, the margins were analyzed quantitatively by SEM. The tooth/cement and cement/inlay interfaces were scored separately. The initial percentages of "continuous margin"--at both the tooth/luting composite and luting composite/inlay interfaces--were higher than 94% for all groups. At the end of the load cycles, the quality of the margins at the tooth/luting composite interface significantly decreased for all groups. The highest decrease was found for the cervical margins located in dentin, where only 37%-61% were scored as "continuous margin". The AP.H inlay/luting composite interface showed almost no change. At the MGC inlay/luting composite interface, the percentage of "continuous margin" decreased to 74%. After specimens were loaded, the percentage of "continuous margin" in dentin was lower than in enamel, despite the use of a dentin bonding agent (PUB 2).(ABSTRACT TRUNCATED AT 250 WORDS)
本体外研究的目的是评估即刻直接“通用型”混合（AP.H）复合嵌体（登士柏）和Cerec Dicor-MGC（登士柏）嵌体，在使用牙本质粘结剂Prisma Universal Bond 2（登士柏）和双固化Dicor-MGC粘结性复合树脂（登士柏）粘结后与牙本质的粘结情况。在24颗拔除的人类磨牙上制备标准的MOD洞型，一个邻面边缘位于釉质，另一个位于牙本质。它们被分为四组：（I）AP.H嵌体，仅使用化学固化的粘结性复合树脂；（II）AP.H嵌体，粘结性复合树脂，即刻光固化；（III）AP.H嵌体，粘结性复合树脂，初始化学固化并延迟光固化（15分钟）；（IV）MGC嵌体，粘结性复合树脂，初始化学固化并延迟光固化（15分钟）。随后进行相当于五年临床应力的体外加载循环。在加载前和加载后，通过扫描电子显微镜对边缘进行定量分析。牙齿/粘结剂和粘结剂/嵌体界面分别评分。所有组在牙齿/粘结性复合树脂和粘结性复合树脂/嵌体界面处“连续边缘”的初始百分比均高于94%。在加载循环结束时，所有组牙齿/粘结性复合树脂界面边缘的质量均显著下降。位于牙本质的颈部边缘下降幅度最大，仅有37%-61%被评为“连续边缘”。AP.H嵌体/粘结性复合树脂界面几乎没有变化。在MGC嵌体/粘结性复合树脂界面，“连续边缘”的百分比降至74%。加载后，尽管使用了牙本质粘结剂（PUB 2），牙本质中“连续边缘”的百分比仍低于釉质。（摘要截断于250字）
