Evaluation of the Flexural Strength of Submicron Hybrid Composite using Different Fabrication Methods: An in vitro Study
Achla Sethi, Kanwar Sidharth, Taranjit Kaur, Sukhpash Singh Sandhu, Amit K Joseph
Citation Information :
Sethi A, Sidharth K, Kaur T, Singh Sandhu S, Joseph AK. Evaluation of the Flexural Strength of Submicron Hybrid Composite using Different Fabrication Methods: An in vitro Study. J Contemp Dent Pract 2018; 19 (2):205-209.
The aim of this study is to perform three-point bend test on submicron hybrid composite fabricated with direct and indirect veneer technique.
Materials and methods
A total of 20 maxillary anterior teeth were selected, and labial reduction of 0.5 to 0.75 mm with a chamfered finish line for veneer preparation was done. Teeth were divided into two groups depending on fabrication technique being used: group I—veneers fabricated with light and group II—veneers fabricated with light and heat (PHOTOPOL). Specimens were tested under universal testing machine (UTM) where load was applied at a crosshead speed of 1 mm/min with a pointer of 1 mm diameter. Data were statistically analyzed.
Results
The results showed highly significant difference between the two groups with the mean value of group I (246.7 ± 2.285 N) and group II (531.1 ± 4.411 N).
Conclusion
The curing mechanism involving light and heat increases the fracture resistance of the veneers.
Clinical significance
Within the limitations of this study, the results led to the conclusion that the association of common composites with a simple postcure heat treatment may be an alternative for current indirect composite systems, although more studies are needed to assess other properties of the composites for this application.
How to cite this article
Sethi A, Makkar S, Sidharth K, Kaur T, Sandhu SS, Joseph AK. Evaluation of the Flexural Strength of Submicron Hybrid Composite using Different Fabrication Methods: An in vitro Study. J Contemp Dent Pract 2018;19(2):205-209.
Bond strength and monomer conversion of indirect composite resin restorations, part 1: light vs heat polymerization. J Adhes Dent 2014 Dec;16(6):517-522.
Current trends in dental composites. Crit Rev Oral Biol Med 1995;6(4):302-318.
M-CDNJM Huysmans. 12-year survival of composite vs. amalgam restorations. J Dent Res 2010 Oct;89(10):1063-1067.
The influence of postcuring on the fracture properties of photo-cured dimethacrylate based dental composite resin. J Biomed Mater Res 1987 Aug;21(8):979-989.
Mechanical properties of light-curing composites polymerized with different laboratory photo-curing units. Dent Mater J 2007 Mar;26(2):217-223.
Flexural strengths of conventional and nanofilled fiber-reinforced composites: a three-point bending test. Dent Traumatol 2014 Feb;30(1):32-35.
Heat treatment of a direct composite resin: Influence on flexural strength. Braz Oral Res 2009 Jul-Sep;23(3):241-247.
Effect of intermediate fiber layer on the fracture load and failure mode of maxillary incisors restored with laminate veneers. Dent Mater J 2008 Jan;27(1):61-68.
Effect of ultrasonic versus manual cementation on the fracture strength of resin composite laminates. Oper Dent 2009 Jul-Aug;34(4):437-442.
Direct composite laminate veneers: three case reports. J Dent Res Dent Clin Dent Prospects 2013 Spring;7(2):105-111.
Direct composite restorations: extended use in anterior and posterior situations. Clin Oral Investig 2004 Jul;8(2):43-44.
Five-year clinical performance of porcelain laminate veneers. Quintessence Int 2002 Mar;33(3):185-189.
Sturdevent art and science of operative dentistry. St. Louis, MO: Mosby; 2006.
Effects of postcuring by heat on the mechanical properties of visible light cured inlay composites. J Oral Rehabil 1993 Nov;20(6):605-614.
The influence of temperature on some physical properties of dental composites. J Oral Rehabil 1981 Jun;8(4):309-317.
Properties of a new carvable composite dental filling material. Aust Dent J. 1977;22(4):232-235.
Biological effects of dental materials: 2. Toxicity of anterior tooth restorative materials on HeLa cells in vitro. J Oral Pathol 1973 Nov;36(5):713-724.
Effect of heating delay on conversion and strength of a post cured resin composite. J Dent Res 1998 Feb;77(2):426-431.
The effect of heat used as a secondary cure upon the physical properties of three composite resins. I. Diametral tensile strength, compressive strength, and marginal dimensional stability. Quintessence Int 1987 Apr;18(4):265-271.