Dental Journal of Advance Studies

Register      Login

VOLUME 8 , ISSUE 3 ( September-December, 2020 ) > List of Articles

Original Article

To Evaluate the Effect of Water Temperature and Duration of Immersion on the Marginal Accuracy and Microhardness of Provisional Restoration: An In Vitro Study

Sanjan Verma, Ritu Batra, Abhishek Avasthi

Keywords : microhardness, provisional crowns, ANOVA test

Citation Information : Verma S, Batra R, Avasthi A. To Evaluate the Effect of Water Temperature and Duration of Immersion on the Marginal Accuracy and Microhardness of Provisional Restoration: An In Vitro Study. 2020; 8 (3):115-126.

DOI: 10.1055/s-0040-1716315

License: CC BY-NC-ND 4.0

Published Online: 06-12-2020

Copyright Statement:  © 2020 Bhojia Dental College and Hospital affiliated to Himachal Pradesh University


Abstract

Introduction Provisional restoration is a critical component of fixed prosthodontics treatment, which must satisfy many inter-relative factors such as biological, mechanical, and esthetic. These restorations should have accurate marginal adaptation and optimum strength to maintain functional demands. The present “in vitro” study was conducted to evaluate the effect of water temperature and duration of immersion, on the marginal adaptation and microhardness of four different commercially available provisional restorative materials. Materials and Methods The 240 specimens were then seated on the stainless-steel die which simulated the prepared tooth, and evaluated for the marginal gap for four different provisional restorative materials and divided into four different groups A, B, C, and D. Each group was further divided into six subgroups according to temperature of water and time of immersion. In each group the samples were immersed in water at 20, 30, and 40 degrees, respectively for 5 and 10-minutes duration. Four different temporary restorative materials for crown fabrication were loaded each time to make temporary crowns. Results Each sample was placed under travelling stereoscopic microscope (20× magnification) and photographed. Results for each surface were obtained, and the average of three surfaces was calculated. Knoop hardness was measured using a microhardness tester. The study was subjected to statistical analysis, to know the statistical significance, of the effect of difference in time and temperature changes at the time of final polymerization on surface microhardness and marginal integrity of four different provisional restorative materials. Discussion The mean marginal discrepancies of bis-GMA (group B) at 20, 30, and 40°C for 5 and 10 minutes in water were smaller than the results of other groups. Microhardness evaluation showed that the poly ethyl methacrylate (PEMA) type resin exhibited significantly lower microhardness than the bis-acryl resin composites (Protemp 4 and Systemp.c&b) at both time and temperature intervals. Conclusion The bis-acryl composites material has the least marginal discrepancy in comparison with PEMA and polymethyl methacrylate (PMMA). The bis-acryl composites materials exhibit superior surface microhardness followed by PEMA and PMMA.


PDF Share
  1. 3rd ed. St. Louis: Mosby; 2000 618–630
  2. Marginal integrity of provisional resin restoration materials: a review of the literature. Saudi J Dent Res 2015;6:33–40
  3. An in vitro evaluation of flexural strength of direct and indirect provisionalization materials. J Indian Prosthodont Soc 2005;5(3):132–135
  4. The provisional fixed partial denture. J Prosthet Dent 1975;34(5):520–526
  5. In-office provisional restorative materials for fixed prosthodontics. Inside Dentistry 2009;5(4):1–7
  6. Long-term effects of storage and thermal cycling on the marginal adaptation of provisional resin crowns: a pilot study. J Prosthet Dent 2006;95(3): 230–236
  7. Marginal adaptation of provisional acrylic resin crowns. J Prosthet Dent 1985;54(2):194–197
  8. A comparative study to evaluate the marginal accuracy of provisional restorations fabricated by light polymerized resin and auto polymerized resin: a scanning electron microscope study. J Indian Prosthodont Soc 2006;6(3):122–127
  9. Microhardness of provisional fixed prosthodontic materials. J Prosthet Dent 1999;82(5):525–528
  10. Evaluation of hardness and wear resistance of interim restorative materials. Dent Res J (Isfahan) 2013;10(2):184–189
  11. Effect of water temperature on the fit of provisional crown margins during polymerization. J Prosthet Dent 1999;82(6):658–661
  12. Effect of water temperature and duration of immersion on the marginal accuracy of provisional crowns. Med J Armed Forces India 2011;67(3):237–240
  13. An in vitro comparison of marginal accuracy in temporary crowns. J Contemp Dent 2013;3(3):121–126
  14. Marginal accuracy of provisional restorative materials used in fixed partial dentures an in-vitro study. Indian J Dent Sci 2012;3(4):25–29
  15. Comparative in vitro evaluation of two provisional restorative materials. J Prosthet Dent 2001;85(2):129–132
  16. Polymerization shrinkage-strain kinetics of temporary crown and bridge materials. Dent Mater 2004;20(1):88–95
PDF Share
PDF Share

© Jaypee Brothers Medical Publishers (P) LTD.