Kyoizumi Hideaki, Yamada Junji, Suzuki Toshimitsu, Kanehira Masafumi, Finger Werner J, Sasaki Keiichi
Assistant Lecturer, Department of Conservative Dentistry, Division of Esthetic Dentistry and Clinical Cariology, Showa University School of Dentistry, Tokyo, Japan, Phone: +81-3-3787-1151, e-mail:
Visiting Lecturer, Department of Conservative Dentistry, Division of Esthetic Dentistry and Clinical Cariology, Showa University School of Dentistry, Tokyo, Japan.
J Contemp Dent Pract. 2013 Nov 1;14(6):1137-44. doi: 10.5005/jp-journals-10024-1464.
To investigate and compare the effects of toothbrushes with different hardness on abrasion and surface roughness of composite resins.
Toothbrushes (DENT. EX Slimhead II 33, Lion Dental Products Co. Ltd., Tokyo, Japan) marked as soft, medium and hard, were used to brush 10 beam-shaped specimens of each of three composites resins (Venus [VEN], Venus Diamond [VED] and Venus Pearl [VEP]; HeraeusKulzer) with standardized calcium carbonate slurry in a multistation testing machine (2N load, 60 Hz). After each of five cycles with 10k brushing strokes the wear depth and surface roughness of the specimens were determined. After completion of 50k strokes representative samples were inspected by SEM. Data were treated with ANOVA and regression analyses (p < 0.05).
Abrasion of the composite resins increased linearly with increasing number of brushing cycles (r² > 0.9). Highest wear was recorded for VEN, lowest for VED. Hard brushes produced significantly higher wear on VEN and VEP, whereas no difference in wear by toothbrush type was detected for VED. Significantly highest surface roughness was found on VED specimens (Ra > 1.5 µm), the lowest one on VEN (Ra < 0.3 µm). VEN specimens showed increased numbers of pinhole defects when brushed with hard toothbrushes, surfaces of VEP were uniformly abraded without level differences between the prepolymerized fillers and the glass filler-loaded matrix, VED showed large glass fillers protruding over the main filler-loaded matrix portion under each condition.
Abrasion and surface roughness of composite resins produced by toothbrushing with dentifrice depend mainly on the type of restorative resin. Hardness grades of toothbrushes have minor effects only on abrasion and surface roughness of composite resins. No relationship was found between abrasion and surface roughness.
The grade of the toothbrush used has minor effect on wear, texture and roughness of the composite resin.
研究并比较不同硬度牙刷对复合树脂磨损及表面粗糙度的影响。
使用标记为软、中、硬的牙刷（DENT. EX Slimhead II 33，日本东京狮王齿科产品有限公司），在多工位试验机中用标准化碳酸钙浆料对三种复合树脂（Venus [VEN]、Venus Diamond [VED] 和 Venus Pearl [VEP]；贺利氏古莎）的10个梁形试件进行刷牙（负载2N，60Hz）。在每进行10000次刷牙冲程的五个循环后，测定试件的磨损深度和表面粗糙度。在完成50000次冲程后，用扫描电子显微镜检查代表性样本。数据采用方差分析和回归分析（p<0.05）。
复合树脂的磨损随刷牙循环次数的增加呈线性增加（r²>0.9）。VEN的磨损最高，VED的磨损最低。硬毛牙刷对VEN和VEP产生的磨损显著更高，而VED未检测到牙刷类型对磨损的差异。VED试件的表面粗糙度显著最高（Ra>1.5µm），VEN的最低（Ra<0.3µm）。用硬毛牙刷刷牙时，VEN试件的针孔缺陷数量增加，VEP的表面均匀磨损，预聚合填料和玻璃填料填充基体之间没有水平差异，在每种条件下VED都显示出大的玻璃填料突出于主要填料填充的基体部分之上。
使用牙膏刷牙导致的复合树脂磨损和表面粗糙度主要取决于修复性树脂的类型。牙刷的硬度等级对复合树脂的磨损和表面粗糙度影响较小。未发现磨损与表面粗糙度之间的关系。
所用牙刷的等级对复合树脂的磨损、质地和粗糙度影响较小。
