{"title":"陶瓷的组成和色度对双固化树脂水泥透光性和转化率的影响。","authors":"Luana Menezes de Mendonça, Ilana Santos Ramalho, Livia Aguiar Santos Nogueira Lima, Laís Alcântara Pires, Thiago Amadei Pegoraro, Luiz Fernando Pegoraro","doi":"10.1590/1678-7757-2018-0351","DOIUrl":null,"url":null,"abstract":"<p><strong>Objective: </strong>Since the transmittance of ceramics can influence the degree of conversion (DC) of resin cements, ceramics composition and shade should be considered in the selection of resin cement. This in vitro study aimed to evaluate the effect of the transmittance of different composition, opacities and shades of ceramics on the degree of conversion of two dual-cured resin cements.</p><p><strong>Methodology: </strong>Sixty discs were prepared from low translucency (LT) and medium opacity (MO) lithium disilicate ceramic, and zirconia ceramic (Z). Each group was subdivided into 5 subgroups (n=4) in shades A2, A3.5, B2, C2 and D3. The transmittance measurement was performed in a spectrophotometer. The Variolink II and Rely X U200 resin cements were photoactivated by LED (1400 mW/cm2) for 40 s through the ceramic discs and without the discs (control group). The DC was measured with infrared FTIR spectroscopy, immediately after light activation. Data were analyzed with Kruskall-Wallis and one-way ANOVA, following post-hoc comparisons by Tukey test and Pearson's correlation test (P<0.05).</p><p><strong>Results: </strong>LT ceramic exhibited higher transmittance values compared to MO and Z ceramics. LTA2 and LTB2 showed statistically higher transmittance values compared to MOA2, MOA3.5 and ZA3.5. For Variolink II, the ceramic interposition did not influence the DC, since there were no statistical differences between groups with ceramic interposition and the control group. For Rely X U200 cement, the interposition of some ceramics types/shades (LTA3.5, MOA2, MOA3.5 and ZA3.5) significantly decreased the DC values compared to control group. A positive correlation was found between the ceramic transmittance and DC values of both tested cements. Conclusions. The transmittance and DC values of the cements were influenced by composition and shades of the ceramics. The higher the transmittance of ceramics, the higher the DC values for both cements.</p>","PeriodicalId":321675,"journal":{"name":"Journal of applied oral science : revista FOB","volume":" ","pages":"e20180351"},"PeriodicalIF":0.0000,"publicationDate":"2019-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1590/1678-7757-2018-0351","citationCount":"17","resultStr":"{\"title\":\"Influence of the composition and shades of ceramics on light transmission and degree of conversion of dual-cured resin cements.\",\"authors\":\"Luana Menezes de Mendonça, Ilana Santos Ramalho, Livia Aguiar Santos Nogueira Lima, Laís Alcântara Pires, Thiago Amadei Pegoraro, Luiz Fernando Pegoraro\",\"doi\":\"10.1590/1678-7757-2018-0351\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><strong>Objective: </strong>Since the transmittance of ceramics can influence the degree of conversion (DC) of resin cements, ceramics composition and shade should be considered in the selection of resin cement. This in vitro study aimed to evaluate the effect of the transmittance of different composition, opacities and shades of ceramics on the degree of conversion of two dual-cured resin cements.</p><p><strong>Methodology: </strong>Sixty discs were prepared from low translucency (LT) and medium opacity (MO) lithium disilicate ceramic, and zirconia ceramic (Z). Each group was subdivided into 5 subgroups (n=4) in shades A2, A3.5, B2, C2 and D3. The transmittance measurement was performed in a spectrophotometer. The Variolink II and Rely X U200 resin cements were photoactivated by LED (1400 mW/cm2) for 40 s through the ceramic discs and without the discs (control group). The DC was measured with infrared FTIR spectroscopy, immediately after light activation. Data were analyzed with Kruskall-Wallis and one-way ANOVA, following post-hoc comparisons by Tukey test and Pearson's correlation test (P<0.05).</p><p><strong>Results: </strong>LT ceramic exhibited higher transmittance values compared to MO and Z ceramics. LTA2 and LTB2 showed statistically higher transmittance values compared to MOA2, MOA3.5 and ZA3.5. For Variolink II, the ceramic interposition did not influence the DC, since there were no statistical differences between groups with ceramic interposition and the control group. For Rely X U200 cement, the interposition of some ceramics types/shades (LTA3.5, MOA2, MOA3.5 and ZA3.5) significantly decreased the DC values compared to control group. A positive correlation was found between the ceramic transmittance and DC values of both tested cements. Conclusions. The transmittance and DC values of the cements were influenced by composition and shades of the ceramics. The higher the transmittance of ceramics, the higher the DC values for both cements.</p>\",\"PeriodicalId\":321675,\"journal\":{\"name\":\"Journal of applied oral science : revista FOB\",\"volume\":\" \",\"pages\":\"e20180351\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2019-07-29\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://sci-hub-pdf.com/10.1590/1678-7757-2018-0351\",\"citationCount\":\"17\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of applied oral science : revista FOB\",\"FirstCategoryId\":\"3\",\"ListUrlMain\":\"https://doi.org/10.1590/1678-7757-2018-0351\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of applied oral science : revista FOB","FirstCategoryId":"3","ListUrlMain":"https://doi.org/10.1590/1678-7757-2018-0351","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 17
摘要
目的:由于陶瓷的透光率会影响树脂水泥的转化率(DC)，因此在选择树脂水泥时应考虑陶瓷的成分和色度。本体外实验旨在评价不同成分、不透明度和深浅度陶瓷的透光率对两种双固化树脂胶结物转化程度的影响。方法:采用低半透明(LT)和中不透明(MO)二硅酸锂陶瓷和氧化锆陶瓷(Z)制备60个椎间盘，每组分为5个亚组(n=4)，分别为A2、A3.5、B2、C2和D3。通过分光光度计测量透光率。Variolink II和Rely X U200树脂水泥通过陶瓷盘和不带陶瓷盘(对照组)，用LED (1400 mW/cm2)光激活40 s。光激活后立即用红外傅立叶红外光谱测量直流电。数据分析采用Kruskall-Wallis和单因素方差分析，事后比较采用Tukey检验和Pearson相关检验(结果:LT陶瓷比MO和Z陶瓷具有更高的透光率值)。与MOA2、MOA3.5和ZA3.5相比，LTA2和LTB2的透射率值具有统计学意义。对于Variolink II，陶瓷干预不影响DC，因为陶瓷干预组与对照组之间没有统计学差异。对于Rely X U200水泥，与对照组相比，一些陶瓷类型/色调(LTA3.5, MOA2, MOA3.5和ZA3.5)的介入显著降低了DC值。两种水泥的陶瓷透光率与直流值呈正相关。结论。水泥的透光率和直流值受陶瓷的组成和色度的影响。陶瓷的透光率越高，两种水泥的直流值越高。
Influence of the composition and shades of ceramics on light transmission and degree of conversion of dual-cured resin cements.
Objective: Since the transmittance of ceramics can influence the degree of conversion (DC) of resin cements, ceramics composition and shade should be considered in the selection of resin cement. This in vitro study aimed to evaluate the effect of the transmittance of different composition, opacities and shades of ceramics on the degree of conversion of two dual-cured resin cements.
Methodology: Sixty discs were prepared from low translucency (LT) and medium opacity (MO) lithium disilicate ceramic, and zirconia ceramic (Z). Each group was subdivided into 5 subgroups (n=4) in shades A2, A3.5, B2, C2 and D3. The transmittance measurement was performed in a spectrophotometer. The Variolink II and Rely X U200 resin cements were photoactivated by LED (1400 mW/cm2) for 40 s through the ceramic discs and without the discs (control group). The DC was measured with infrared FTIR spectroscopy, immediately after light activation. Data were analyzed with Kruskall-Wallis and one-way ANOVA, following post-hoc comparisons by Tukey test and Pearson's correlation test (P<0.05).
Results: LT ceramic exhibited higher transmittance values compared to MO and Z ceramics. LTA2 and LTB2 showed statistically higher transmittance values compared to MOA2, MOA3.5 and ZA3.5. For Variolink II, the ceramic interposition did not influence the DC, since there were no statistical differences between groups with ceramic interposition and the control group. For Rely X U200 cement, the interposition of some ceramics types/shades (LTA3.5, MOA2, MOA3.5 and ZA3.5) significantly decreased the DC values compared to control group. A positive correlation was found between the ceramic transmittance and DC values of both tested cements. Conclusions. The transmittance and DC values of the cements were influenced by composition and shades of the ceramics. The higher the transmittance of ceramics, the higher the DC values for both cements.
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号
