Porto Isabel Cristina Celerino de Moraes, de Aguiar Flávio Henrique Baggio, Brandt William Cunha, Liporoni Priscila Christiane Susy
Department of Restorative Dentistry, Federal University of Alagoas, Campus AC Simões, Av. Lourival Melo Mota, S/N, Tabuleiro do Martins, CEP: 57072-970, Maceió, Alagoas, Brazil.
J Dent. 2013 Aug;41(8):732-9. doi: 10.1016/j.jdent.2013.05.012. Epub 2013 Jun 2.
This study measured the degree of conversion (DC), sorption, solubility and microhardness of methacrylate (Filtek Z250 and Filtek Z350XT) and silorane-based composites (Filtek P90).
DC was measured using near infrared spectroscopy immediately and 24h after the photoactivation. Sorption and solubility measurements were performed after 24h, 4 weeks and 12 weeks of storage in water. Knoop microhardness was measured after 24h and after thermal cycling. The data were statistically analyzed using ANOVA followed by Tukey's, Tamhane or paired t-tests (α=0.05).
The DC for P90 (37.22±1.46) was significantly lower than the Z250 (71.44±1.66) and Z350 (71.76±2.84). Water sorption was highest in the Z250 and lowest in the P90. All the tested composites exhibited similar values after 24h of immersion, and no significant differences were observed. No significant differences were observed between the solubilities of the P90 composite (12 weeks) and the Z250 or Z350 composites (4 weeks). KHN values were less elevated for the P90 composite and similar for the Z250 and Z350 composites. An effect of thermal cycling on KHN values was observed for all the composites (p<0.001).
Silorane produced the lowest DC and KHN values and exhibited lower water sorption and solubility compared to methacrylate-based composites. These differences suggest that silorane composites exhibit better hydrolytic stability after 3 months of water immersion compared to conventional methacrylate-based composites.
Silorane had higher hydrolytic stability after 3 months of water immersion than the methacrylate-based resins, despite the lower values of DC and KHN recorded.
本研究测定了甲基丙烯酸酯类（Filtek Z250和Filtek Z350XT）和硅烷类复合材料（Filtek P90）的转化率（DC）、吸附性、溶解性和显微硬度。
在光固化后即刻及24小时后使用近红外光谱法测定DC。在水中储存24小时、4周和12周后进行吸附性和溶解性测量。在24小时后及热循环后测量努氏显微硬度。使用方差分析（ANOVA），随后进行Tukey检验、Tamhane检验或配对t检验对数据进行统计学分析（α=0.05）。
P90的DC（37.22±1.46）显著低于Z250（71.44±1.66）和Z350（71.76±2.84）。Z250的吸水性最高，P90的吸水性最低。所有测试的复合材料在浸泡24小时后表现出相似的值，未观察到显著差异。P90复合材料（12周）的溶解性与Z250或Z350复合材料（4周）的溶解性之间未观察到显著差异。P90复合材料的努氏硬度值升高较少，Z250和Z350复合材料的努氏硬度值相似。观察到所有复合材料的热循环对努氏硬度值有影响（p<0.001）。
与甲基丙烯酸酯类复合材料相比，硅烷类材料产生的DC和努氏硬度值最低，且吸水性和溶解性较低。这些差异表明，与传统的甲基丙烯酸酯类复合材料相比，硅烷类复合材料在水浸泡3个月后表现出更好的水解稳定性。
尽管记录的DC和努氏硬度值较低，但硅烷类材料在水浸泡3个月后的水解稳定性高于甲基丙烯酸酯类树脂。
