title: Comparative evaluation of surface hardness and depth of cure of silorane and methacrylate-based posterior composite resins: An in vitro study.
abstract: OBJECTIVE
  This in vitro study was carried out to compare the effect of LED light curing system on polymerization and hardness of silorane-based and methacrylate-based posterior composite resin.
  
  
  METHODS
  A total of 40 samples, 20 of silorane-based composite Filtek P-90 and 20 of methacrylate-based composite Heliomolar HB measuring 2 mm thickness and 8 mm diameter were prepared using Teflon molds and cured using LED curing light. The samples were polished and tested in Knoop hardness tester using a 50-gram load and dwell time of 15 seconds on top and bottom surfaces. The percentage depth of cure was calculated, and statistical analysis was performed using two-way ANOVA test and Student t- test.
  
  
  RESULTS
  Higher statistically significant values were seen for both the top and bottom surface hardness in silorane-based resins than methacrylate-based resins on LED light curing.
  
  
  CONCLUSIONS
  Greater depth of cure was achieved in silorane-based posterior composite than in methacrylate-based posterior composite resins with a statistically significant difference.
authors.affiliation: Department of Conservative Dentistry and Endodontics, Sharad Pawar Dental College, Sawangi, Wardha, Mumbai, Maharashtra, India.
authors.forename: Abhishek
authors.initials: A
authors.lastname: Agrawal
authors.affiliation: Department of Conservative Dentistry and Endodontics, Sharad Pawar Dental College, Sawangi, Wardha, Mumbai, Maharashtra, India.
authors.forename: Narendra U
authors.initials: NU
authors.lastname: Manwar
authors.affiliation: Department of Conservative Dentistry and Endodontics, Sharad Pawar Dental College, Sawangi, Wardha, Mumbai, Maharashtra, India.
authors.forename: Shubha G
authors.initials: SG
authors.lastname: Hegde
authors.affiliation: Department of Conservative Dentistry and Endodontics, Sharad Pawar Dental College, Sawangi, Wardha, Mumbai, Maharashtra, India.
authors.forename: Manoj
authors.initials: M
authors.lastname: Chandak
authors.affiliation: Department of Conservative Dentistry and Endodontics, Sharad Pawar Dental College, Sawangi, Wardha, Mumbai, Maharashtra, India.
authors.forename: Anuja
authors.initials: A
authors.lastname: Ikhar
authors.affiliation: Department of Conservative Dentistry and Endodontics, Sharad Pawar Dental College, Sawangi, Wardha, Mumbai, Maharashtra, India.
authors.forename: Aditya
authors.initials: A
authors.lastname: Patel
keywords: Depth of cure; Silorane-based posterior composites; methacrylate-based posterior composites; posterior composites; surface hardness
references.citation: Med Oral Patol Oral Cir Bucal. 2009 Jan 01;14(1):E51-6
references.pmid: 19114957
references.citation: J Am Dent Assoc. 2002 Apr;133(4):429-34; quiz 491-3
references.pmid: 11991459
references.citation: J Conserv Dent. 2010 Jul;13(3):152-5
references.pmid: 21116392
references.citation: Oper Dent. 2000 Mar-Apr;25(2):113-20
references.pmid: 11203797
references.citation: Compend Contin Educ Dent. 2010 Sep;31(7):498-505; quiz 506, 508
references.pmid: 20879203
references.citation: J Dent Res. 1987 Mar;66(3):727-30
references.pmid: 3475304
references.citation: Braz Dent J. 2010;21(6):538-42
references.pmid: 21271045
references.citation: J Conserv Dent. 2013 Nov;16(6):503-8
references.pmid: 24347882
references.citation: Oper Dent. 2010 Jan-Feb;35(1):58-68
references.pmid: 20166412