光照模式对两种牙本质粘接剂硬度和微拉伸强度的影响  

Effect of curing modes on knoop hardness and microtensile bond strength of two dentin adhesives

作　　者：魏文佳[1] 孟翔峰[1] 黄政 刘侠[1] 

机构地区：[1]南京大学口腔医学院·南京市口腔医院修复科,210008 [2]口腔颌面外科

出　　处：《中华口腔医学杂志》2013年第1期45-49,共5页Chinese Journal of Stomatology

基　　金：南京市医学重点科技发展项目（ZKX09035）

摘　　要：目的评价光照模式和时间对牙本质树脂粘接剂硬度和微拉伸强度的影响，以期为临床提供参考。方法选取20颗人磨牙制成80个1mm厚牙本质片，采用全酸蚀粘接剂和自酸蚀粘接剂涂布于牙本质表面，分别接受高光强模式（1250mW／cm2）照射10、15、20S和软启动模式照射20s，测量24h后粘接剂层的努氏硬度。选取40颗磨牙，暴露冠部牙本质，进行上述树脂粘接处理，分层充填光固化复合树脂，每组制备微拉伸试件15个，水储存1周后测量微拉伸强度，观察试件断裂模式。采用方差分析和LSD多重检验进行比较（α=0．05）。结果全酸蚀粘接剂4种光照条件（高光强10、15、20s和软启动20s）的努氏硬度[（28．20±5．36）、（29．13±5．60）、（28．13±4．40）和（27．06±3．77）MPa]和微拉伸强度[（22．30±5．07）、（22．73±6．59）、（26．32±6．17）和（25．67±4．31）MPa]差异无统计学意义（P〉0．05）。自酸蚀粘接剂高光强20S组努氏硬度[（28．23±3．67）MPa]显著高于高光强10s[（14．15±2．24）MPa]和15s组[（17．63±2．17）MPa]（P〈0．05），高光强20s组的微拉伸强度[（42．52±3．59）MPa]亦显著高于高光强10s[（24．21±3．60）MPa]、15s[（22．25±4．16）MPa]和软启动20s组[（31．12±5．40）MPa]（P〈0．05）。在高光强20S和软启动20s照射条件下，两种粘接剂努氏硬度差异无统计学意义，但自酸蚀粘接剂的微拉伸强度显著高于全酸蚀粘接剂（P〈0．05）。结论不同类型牙本质树脂粘接剂所需要的最佳高光强持续照射时间不同，本项研究所采用的软启动模式与持续高光强模式相比不具备优势。Objective To evaluated the effect of curing modes and light-cure times on knoop hardness（KH） and microtensile bond strength（ ixTBS）of dentin adhesives in vitro. Methods Twenty molars were made into 80 dentin slices （about 1 mm thick）. The dentin slices were prepared with an etch ＆ rinse adhesive A（ ONE-STEP PLUS） and a self-etch adhesive B （ Clearfil SE Bond）, and light-cured respectively under fast mode, i. e. 1250 mW/cm2 light intensity for 10 s, 15 s, 20 s, and ramp mode（soft start curing mode）, i. e. initial 0 mW/cm2 gradually increasing to 1250 mW/em2 in first 10 s, then steady for the next 10 s. The prepared dentin slices were kept in dark dry room for 24 h at 37 ~C, and KH were tested. The other 40 molars were flattened to expose coronal dentin, prepared with adhesives as above. Then the prepared teeth were restored with resin composites incrementally and cured under fast mode. The restored teeth were stored in water for 24 h at 37 ~C, and slowly sectioned to obtain multiple bonded beams. After 7 d water-storage, the samples received microtensile bond test, and the failure models of beams were observed under a stereomicroscope. Data were analyzed by ANOVA and LSD test （a = 0. 05 ）. Results No statistical difference in KH [ （28. 20 ± 5.36）, （29. 13 ± 5.60）, （28.13 -s 4.40 ）, （ 27.06 ± 3.77 ） MPa ] and txTBS [ （22. 30 ±5.07 ）, （22. 73 ± 6. 59）, （26. 32 ± 6. 17）, （25.67 ± 4. 31 ） MPa ] of adhesive A were foundbetween four curing conditions（fast mode for 10 s, 15 s, 20 s and ramp mode for 20 s） （P 〉 O. 05 ）. In adhesive B, KH of Fast 20 s [ （ 28.23±3.67 ） MPa ] were significantly higher than those of Fast 10 s [（14. 15 ±2.24） MPa]and Fast 15 s[ （17.63 ±2. 17） MPa] （P 〈0.05）. The TBS of Fast 20 s[ （42. 52 ± 3.59） MPa] were significantly higher than those of Fast 10 s[ （24. 21 ±3.60） MPa], Fast 15 s[ （22. 25 ± 4. 16） MPa] and Ramp 20 s[ （31.12±5.40） MPa] （P 〈0.05）. In Fast 20 s and Ramp 2

关 键 词：牙本质粘结剂 硬度 拉伸强度 光 

分 类 号：R783.1[医药卫生—口腔医学]