J Adv Prosthodont.  2012 Feb;4(1):24-29. 10.4047/jap.2012.4.1.24.

Comparative evaluation of sodium hypochlorite and microwave disinfection on dimensional stability of denture bases

Affiliations
  • 1Department of Prosthodontics, Sharad Pawar Dental College and Hospital, Maharashtra, India. rutuja_phutane@yahoo.com

Abstract

PURPOSE
To compare the effect of sodium hypochlorite and microwave disinfection on the dimensional stability of denture bases without and with relining.
MATERIALS AND METHODS
A brass die was prepared by simulating an edentulous maxillary arch. It was used to fabricate 1.5 mm and 3 mm of thickness denture bases (n = 40). The 1.5 mm of thickness-specimens (n = 20) were relined with 1.5 mm of autopolymerizing relining resin. Five holes were prepared over crest of ridge of brass die with intimately fitting stainless steel pins which were transferred to the intaglio surface of specimens during fabrication of denture bases. For calculation of dimensional changes in denture bases, differences between the baseline area before and after disinfection of the specimens were used. The denture bases without and with relining were divided into 2 groups (each n = 20). Data were analyzed using student paired 't' and unpaired 't' test.
RESULTS
Microwave disinfection produces significant shrinkage in both denture bases without relining (t = 17.16; P<.001) and with relining (t = 14.9; P<.001). Denture bases without relining showed more shrinkage when compared with relined denture bases after microwave disinfection (t = 6.09; P<.001). The changes in dimensional stability after sodium hypochlorite disinfection were not significant for both denture bases without relining (t = 2.19; P=.056) and denture bases with relining (t = 2.17; P=.058).
CONCLUSION
Microwave disinfection leads to increased shrinkage of denture bases without and with relining. Chemical disinfection with sodium hypochlorite seems to be a safer method of disinfection with regards to physical properties such as changes in dimensional stability.

Keyword

Disinfection; Denture Bases; Sodium Hypochlorite; Microwave

MeSH Terms

Copper
Denture Bases
Dentures
Disinfection
Humans
Microwaves
Sodium
Sodium Hypochlorite
Stainless Steel
Zinc
Copper
Sodium
Sodium Hypochlorite
Stainless Steel
Zinc

Figure

  • Fig. 1 Master brass die.

  • Fig. 2 The silicone mould-1 and master stone cast retrieved using mould-1.

  • Fig. 3 Silicone mould-2.

  • Fig. 4 Stainless steel pins placed in position after trial closure.

  • Fig. 5 Denture base without relining.

  • Fig. 6 The 1.5 mm larger cast retrieved using mould-3.

  • Fig. 7 Denture base with relining.

  • Fig. 8 Effect of sodium hypochlorite disinfection on dimensional stability of denture bases without and with relining.

  • Fig. 9 Effect of microwave disinfection on dimensional stability of denture bases without and with relining.

  • Fig. 10 Comparison of dimensional stability of denture bases without and with relining after disinfection by sodium hypochlorite and microwave disinfection.


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