Nasoohi Negin, Hoorizad Maryam, Tabatabaei Seyedeh Farnaz
Associate Professor, Department of Restorative and Cosmetic Dentistry, Islamic Azad University, Tehran, Iran.
Postgraduate Student of Restorative and Cosmetic Dentistry, Department of Restorative and Cosmetic Dentistry, Islamic Azad University, Tehran, Iran.
J Dent (Tehran). 2017 Mar;14(2):69-75.
This study aimed to assess the effect of wet and dry finishing and polishing on microhardness and roughness of microhybrid and nanohybrid composites.
Thirty samples were fabricated of each of the Polofil Supra and Aelite Aesthetic All-Purpose Body microhybrid and Grandio and Aelite Aesthetic Enamel nanohybrid composite resins. Each group (n=30) was divided into three subgroups of D, W and C (n=10). Finishing and polishing were performed dry in group D and under water coolant in group W. Group C served as the control group and did not receive finishing and polishing. Surface roughness of samples was measured by a profilometer and their hardness was measured by a Vickers hardness tester. Data were analyzed using two-way ANOVA (P<0.05).
The smoothest surfaces with the lowest microhardness were obtained under Mylar strip without finishing/polishing for all composites (P<0.0001). The highest surface roughness was recorded for dry finishing/polishing for all composites (P<0.0001). Dry finishing/polishing increased the microhardness of all composites (P<0.0001).
Dry finishing and polishing increases the microhardness and surface roughness of microhybrid and nanohybrid composite resins.
本研究旨在评估湿法和干法修整及抛光对微混合和纳米混合复合材料的显微硬度和粗糙度的影响。
制备了30个样本，分别来自Polofil Supra和Aelite Aesthetic All-Purpose Body微混合复合树脂、Grandio和Aelite Aesthetic Enamel纳米混合复合树脂。每组（n = 30）分为D、W和C三个亚组（n = 10）。D组进行干法修整和抛光，W组在水冷条件下进行修整和抛光。C组作为对照组，不进行修整和抛光。用轮廓仪测量样本的表面粗糙度，用维氏硬度计测量其硬度。数据采用双向方差分析（P < 0.05）。
所有复合材料在聚酯薄膜条下未进行修整/抛光时获得了最光滑且显微硬度最低的表面（P < 0.0001）。所有复合材料干法修整/抛光的表面粗糙度最高（P < 0.0001）。干法修整/抛光提高了所有复合材料的显微硬度（P < 0.0001）。
干法修整和抛光会增加微混合和纳米混合复合树脂的显微硬度和表面粗糙度。
