College of Dental Medicine, Qatar University, Doha, Qatar.
Royal Devon and Exeter Hospital, UK.
J Dent. 2020 Aug;99:103376. doi: 10.1016/j.jdent.2020.103376. Epub 2020 May 26.
To evaluate the effects of simulated tooth brushing (STB) on the surface roughness of microhybrid and nanofilled resin composites following different finishing and polishing procedures.
Ninety cylindrical-shaped specimens of Filtek Supreme XT (a universal nano resin composite) and Filtek Z250 (a universal microhybrid resin composite) were prepared. The specimens were allocated at random into 9 paired groups each of 10 specimens. The finishing and polishing systems included were Tungsten Carbide bur (TC); Diamond bur (Db); Sof-Lex discs (S); PoGo discs (PG); TC + S; Db + S; TC + PG; Db + PG. Polymerisation against a Mylar strip without finishing and polishing acted as the control. Surface roughness was measured using a 3D non-contact optical profilometer and surface morphology was examined by scanning electron microscopy. Specimens were subjected to the equivalent of four years STB and surface roughness was measured again.
Mylar formed surfaces were the smoothest for both composites before and after STB. Finishing with the diamond finishing bur caused significantly greater surface irregularity (p < 0.0001) before and after STB compared to the tungsten carbide bur. The surface treatment with Db + PG resulted in significantly greater surface roughness following STB than all other regimes of finishing and polishing (p < 0.01).
Where indicated clinically, finishing is better conducted using a tungsten carbide bur rather than a diamond finishing bur. The combination of tungsten carbide bur/Enhance PoGo and tungsten carbide bur/Sof-Lex surface protocols produced a similarly smooth finish for both composites. The composite surfaces in all groups increased in surface irregularity following STB. CLINICAL SIGNIfiCANCE: Whilst finishing using a tungsten carbide finishing bur followed by either the Sof-Lex or PoGo polishing system may be found to result in a smooth surface finish, all the surfaces investigated increased in surface roughness following toothbrushing.
评估模拟刷牙（STB）对不同修整和抛光程序后微混合和纳米填充树脂复合材料表面粗糙度的影响。
制备 90 个 Filtek Supreme XT（通用纳米树脂复合材料）和 Filtek Z250（通用微混合树脂复合材料）的圆柱形试件。将试件随机分为每组 10 个试件的 9 对。包括的修整和抛光系统有碳化钨车针（TC）；金刚石车针（Db）； Sof-Lex 盘（S）；PoGo 盘（PG）；TC+S；Db+S；TC+PG；Db+PG。不进行修整和抛光，聚合在聚酯薄膜上作为对照。使用三维非接触式光学轮廓仪测量表面粗糙度，并用扫描电子显微镜观察表面形态。将试件暴露于相当于 4 年 STB 后，再次测量表面粗糙度。
在 STB 前后，Mylar 形成的表面对两种复合材料都是最光滑的。在 STB 前后，与碳化钨车针相比，金刚石修整车针的使用会导致表面更明显的不平整（p<0.0001）。在 STB 后，Db+PG 的表面处理比其他所有修整和抛光方法的粗糙度都显著增加（p<0.01）。
在临床上有需要时，最好使用碳化钨车针进行修整，而不是金刚石修整车针。碳化钨车针/Enhance PoGo 和碳化钨车针/Sof-Lex 表面方案的组合对两种复合材料都能产生相似的光滑表面。所有组的复合材料表面在 STB 后都增加了表面不规则性。临床意义：虽然使用碳化钨修整车针，然后使用 Sof-Lex 或 PoGo 抛光系统进行修整可能会发现能产生光滑的表面光洁度，但所有研究的表面在刷牙后都会增加表面粗糙度。
