Comparative Evaluation of Flexural and Impact Strength of different commercially available High Impact Denture Base Materials: An In Vitro Study

Abstract

ABSTRACT Introduction: Acrylic resin is the most common material used for the prosthodontic and orthodontic removable appliances. Many brands have come up with High impact resins to overcome its inherent drawbacks of relatively poor resistance to impact and flexural forces, which might affect lifespan of the denture. Now-a-days, use of the high impact denture base materials is very common and hence, clinicians should be aware of the properties of high impact denture base materials available in market. Aim: To evaluate and compare the impact strength and flexural strength of different brands of high impact denture base materials. Materials and Methods: The present study was a comparative in-vitro study carried out in Krishna Institute of Medical Sciences Deemed to be University, Karad, Maharashtra, India from January 2017 to August 2017. Three high impact denture base materials used in the study were TRIPLEX (Ivoclar, Vivadent, Liechtenstin), LUCITONE 199 (Dentsply International Inc. Degu Dent GmbH Hanau, Germany) and DENTEK (SP Dental, India). Flexural and impact strengths of these three brands of high impact denture base materials were evaluated and analysed statistically using One-way analysis of variance (ANOVA) test with the help of SPSS version 21.0© software (IBM Corporation, Armonk, NY, USA). Results: The mean impact strength values of three groups showed that Group III (DENTEK) (8.45 KJ/mm2) had the highest mean impact strength value followed by Group I (TRIPLEX), (8.19 KJ/mm2) and Group II (LUCITONE 199) (5.43 KJ/mm2). The difference between Groups III and I was insignificant but the difference was significant between Group III and Group II as well as between Group I and Group II. Group II showed highest mean flexural strength (103.45 Mpa) followed by Group I (95.95 Mpa) and Group III (86.22 Mpa). But difference was statistically insignificant among the three groups for flexural strength. Conclusion: The study concluded that highest impact strength recorded was with DENTEK followed by TRIPLEX and LUCITONE. The highest flexural strength recorded was with LUCITONE followed by TRIPLEX and DENTEK.

Keywords

• acrylic reinforcement
• denture fracture
• polymethylmethacrylate
• torsional forces