老化处理对粘结系统与乳牙本质微拉伸粘结强度的影响。

Influence of aging treatments on microtensile bond strength of adhesive systems to primary dentin.

作者信息

Rocha Rachel, Soares Fabio Z M, Rodrigues Celia R M D, Rodrigues Filho Leonardo Eloy

机构信息

Department of Stomatology, University of Santa Maria, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil.

出版信息

J Dent Child (Chic). 2007 May-Aug;74(2):109-12.

PMID:18477429

Abstract

PURPOSE

The purpose of this study was to evaluate the in vitro influence of aging treatments on the microtensile bond strength of 2-step total-etch and self-etch adhesive systems to primary dentin.

METHODS

Class I cavities (4 mm x 4 mm x 2 mm) were prepared in 80 extracted human primary molars divided into 8 groups (N=5) per adhesive system: (1) Single Bond (SI); and (2) Clearfil SE Bond (SE). Restored teeth were exposed to individual and combined aging treatments: (1) thermal (2,000 x at 5-55 degrees C; T); (2) mechanical load (100,000 x 80 N; M); (3) pH (mineralizing/demineralizing solutions; pH); and (4) control (24-hour water storage; C). Beam-shaped microtensile specimens were prepared (0.8 mm2 cross-sectional area) and loaded at a crosshead speed of 1.0 mm/minute in a universal testing machine. Fracture modes were examined by scanning electron microscope.

RESULTS

Means (MPa) and standard deviations (+/-) were: (1) SI-T=24.17 (+/-1.99); (2) SI-M=25.64 (+/-9.75); (3) Si-pH=23.43 (+/-4.19); (4) SI-C=33.81 (+/-2.45); (5) SI-TM=18.60 (+/-3.57); (6) SI-TpH=23.90 (+/-4.28); (7) SI-MpH=20.96 (+/-4.06); (8) SI-TMpH=20.94 (+/-3.15); (9) SE-T=24.08 (+/-4.52); (10) SE-M=18.30 (+/-14.12); (11) SE-pH=19.22 (+/-8.93); (12) SE-C=37.80 (+/-7.28); (13) SE-TM=22.89 (+/-11.74); (14) SE-TpH=27.87 (+/-12.77); (15) SE-MpH=18.87 (+/-10.95); and (16) SE-TMpH=22.55 (+/-3.05). Both adhesive systems presented similar dentin bond strength (P>.05) which were significantly reduced when combined aging treatments were applied or when pH cycling (pH) was done.

CONCLUSION(S): Combined aging treatments and also pH cycling alone influenced negatively adhesive bond strengths.

摘要

目的

本研究旨在评估老化处理对两步法全酸蚀和自酸蚀粘结系统与乳牙本质之间微拉伸粘结强度的体外影响。

方法

在80颗拔除的人类乳牙上制备I类洞（4mm×4mm×2mm），每种粘结系统分为8组（每组n = 5）：（1）单组分粘结剂（SI）；（2）Clearfil SE粘结剂（SE）。修复后的牙齿接受单独和联合老化处理：（1）热循环（5 - 55℃下2000次循环；T）；（2）机械加载（100,000次循环，80N；M）；（3）pH循环（矿化/脱矿溶液；pH）；（4）对照（24小时水储存；C）。制备梁状微拉伸试件（横截面积0.8mm²），并在万能试验机中以1.0mm/分钟的十字头速度加载。通过扫描电子显微镜检查断裂模式。

结果

平均值（MPa）和标准差（±）为：（1）SI - T = 24.17（±1.99）；（2）SI - M = 25.64（±9.75）；（3）Si - pH = 23.43（±4.19）；（4）SI - C = 33.81（±2.45）；（5）SI - TM = 18.60（±3.57）；（6）SI - TpH = 23.90（±4.28）；（7）SI - MpH = 20.96（±4.06）；（8）SI - TMpH = 20.94（±3.15）；（9）SE - T = 24.08（±4.52）；（10）SE - M = 18.30（±14.12）；（11）SE - pH = 19.22（±8.93）；（12）SE - C = 37.80（±7.28）；（13）SE - TM = 22.89（±11.74）；（14）SE - TpH = 27.87（±12.77）；（15）SE - MpH = 18.87（±10.95）；（16）SE - TMpH = 22.55（±3.05）。两种粘结系统表现出相似的牙本质粘结强度（P >.05），当进行联合老化处理或pH循环（pH）时，粘结强度显著降低。