Hannig M, Femerling T
University of Kiel, Clinic of Operative Dentistry and Periodontology, Germany.
Oper Dent. 1998 Sep-Oct;23(5):258-65.
The purpose of this in vitro study was to investigate the effect of air abrasion on the interfacial bond between composite and dentin. Dentin surfaces surrounded by enamel were produced by removing the incisal part of the crown from extracted human anterior teeth. The dentinal area of the specimen surfaces was conditioned either by air-abrasion treatment (27 microns aluminum oxide particles, 120 psi), application of dentin adhesives, and combination of air abrasion and dentin adhesives, or left nontreated (controls). The enamel was conditioned by acid etching, by air abrasion, or by air abrasion and subsequent acid etching. A 2 mm layer of six different composite resins (Brilliant, Charisma, Helioprogress, Herculite, Pekafill, Z-100) was applied on the specimen surfaces and light cured. The composite dentinal interface was evaluated in cross-cut sections of 324 specimens by SEM analysis, and the mean gap width (MGW) between composite and dentin was calculated. SEM analysis revealed gap formation ranging from 1.1-3.6 microns in control specimens. Gap width was reduced significantly due to air-abrasion treatment of the dentinal surface (MGW: 0.3-1.4 microns) or by application of dentin adhesives (MGW: 0.06-0.6 micron). Combined air-abrasion treatment and application of dentin adhesives resulted in a gap-free adaptation between composite and dentin in the majority of specimens. However, thermocycling of the specimens (5 degrees C/55 degrees C; 1000 cycles) caused a significant increase in gap formation (MGW: 0.03-2.9 microns) at the composite-dentin interface. It is concluded that air-abrasion treatment and subsequent application of a dentin adhesive is an effective procedure to resist the contraction stress at the dentinal surface during polymerization of the composite resin and to improve the internal bond of composite resin restorations.
这项体外研究的目的是调查空气喷砂对复合材料与牙本质之间界面结合的影响。通过去除拔除的人前牙冠的切端部分，制备出被牙釉质包围的牙本质表面。将标本表面的牙本质区域分别进行空气喷砂处理（27微米氧化铝颗粒，120磅力/平方英寸）、应用牙本质黏结剂、空气喷砂与牙本质黏结剂联合处理，或不做处理（对照组）。牙釉质通过酸蚀、空气喷砂或空气喷砂后再进行酸蚀来处理。在标本表面涂抹一层2毫米厚的六种不同复合树脂（Brilliant、Charisma、Helioprogress、Herculite、Pekafill、Z - 100），并进行光固化。通过扫描电子显微镜（SEM）分析对324个标本的横断面进行复合牙本质界面评估，并计算复合材料与牙本质之间的平均间隙宽度（MGW）。SEM分析显示，对照组标本中形成的间隙范围为1.1 - 3.6微米。由于对牙本质表面进行空气喷砂处理（MGW：0.3 - 1.4微米）或应用牙本质黏结剂（MGW：0.06 - 0.6微米），间隙宽度显著减小。空气喷砂处理与牙本质黏结剂联合应用使大多数标本中的复合材料与牙本质之间实现了无间隙贴合。然而，对标本进行热循环处理（5摄氏度/55摄氏度；1000个循环）导致复合牙本质界面处的间隙形成显著增加（MGW：0.03 - 2.9微米）。得出的结论是，空气喷砂处理及随后应用牙本质黏结剂是一种有效的方法，可抵抗复合树脂聚合过程中牙本质表面的收缩应力，并改善复合树脂修复体的内部黏结。
