{"title":"Polymerization Shrinkage Stresses of Different Flowable and Universal Bulk-Fill Composites","authors":"Marlen Robles-Moreno","doi":"10.19080/ADOH.2019.10.555794","DOIUrl":null,"url":null,"abstract":"Objective: To analyze and compare the shrinkage stress properties of flowable and universal bulk-fill resin composites over five minutes after photopolymerization. Materials and Methods: Eleven resin composites, seven flowable and four universals, were tested (n=5). Two glass cylinders were affixed end-to-end in a vertical position on an INSTRON universal testing machine, leaving a 1mm gap between them. Each resin was injected until filling the gap and photopolymerized for 20s. The force curve was recorded over 5 minutes after photopolymerization. The stress values were calculated in MPa at 20s, 60s, 180s, and 300s. Statistical analysis using ANOVA and All-Pairs Tukey-Kramer Test (JMP Pro 12.0. SAS, Cary, NC) were done to compare the polymerization shrinkage stresses among the groups at α = 0.05. Results: All the resins showed a continuous increase in shrinkage stress up to the 300 seconds, following photopolymerization. Three flowable composites Dentex, G¬aenial Universal, and Prime-Dent Flow, obtained the highest shrinkage stresses, while another flowable resin SureFil SDR demonstrated the lowest shrinkage stress from all the materials tested. In general, universal composites demonstrated lower shrinkage stress values than the flowable composites. Conclusions: In general, flowable resin composites presented higher shrinkage stresses compared to universal composites. Clinical Bulk-fill resin composites are widely used clinically, yet little information regarding the polymerization shrinkage stresses produced by these materials is available.","PeriodicalId":202100,"journal":{"name":"Advances in Dentistry & Oral Health","volume":"93 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2019-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Advances in Dentistry & Oral Health","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.19080/ADOH.2019.10.555794","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 1
Abstract
Objective: To analyze and compare the shrinkage stress properties of flowable and universal bulk-fill resin composites over five minutes after photopolymerization. Materials and Methods: Eleven resin composites, seven flowable and four universals, were tested (n=5). Two glass cylinders were affixed end-to-end in a vertical position on an INSTRON universal testing machine, leaving a 1mm gap between them. Each resin was injected until filling the gap and photopolymerized for 20s. The force curve was recorded over 5 minutes after photopolymerization. The stress values were calculated in MPa at 20s, 60s, 180s, and 300s. Statistical analysis using ANOVA and All-Pairs Tukey-Kramer Test (JMP Pro 12.0. SAS, Cary, NC) were done to compare the polymerization shrinkage stresses among the groups at α = 0.05. Results: All the resins showed a continuous increase in shrinkage stress up to the 300 seconds, following photopolymerization. Three flowable composites Dentex, G¬aenial Universal, and Prime-Dent Flow, obtained the highest shrinkage stresses, while another flowable resin SureFil SDR demonstrated the lowest shrinkage stress from all the materials tested. In general, universal composites demonstrated lower shrinkage stress values than the flowable composites. Conclusions: In general, flowable resin composites presented higher shrinkage stresses compared to universal composites. Clinical Bulk-fill resin composites are widely used clinically, yet little information regarding the polymerization shrinkage stresses produced by these materials is available.