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

Nirale RM, Thombre R, Kubasad G - J Adv Prosthodont (2012)

Bottom Line: The 1.5 mm of thickness-specimens (n = 20) were relined with 1.5 mm of autopolymerizing relining resin.Data were analyzed using student paired 't' and unpaired 't' test.Chemical disinfection with sodium hypochlorite seems to be a safer method of disinfection with regards to physical properties such as changes in dimensional stability.

View Article: PubMed Central - PubMed

Affiliation: Department of Prosthodontics, Sharad Pawar Dental College and Hospital, Maharashtra, India.

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.

No MeSH data available.


Related in: MedlinePlus

Denture base with relining.
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Figure 7: Denture base with relining.

Mentions: For the fabrication of relined denture base specimens, 1.5 mm-thick base plate wax was adapted over the standard brass cast. This master die with the adapted wax was used to prepare another silicone 'mould-3', which was used to obtain 20 stone casts (Fig. 6). These casts were 1.5 mm larger than the master brass die on tissue surface. Melted wax was injected in silicone 'mould-1' to get 1.5 mm thick denture base. The 1.5 mm-spaced dental stone cast was placed into the mould to get 1.5 mm-thick-waxed record base. The 1.5 mm-wax denture base along with its respective cast was flasked with dental stone as previously described. These denture bases were stored in water at 37±1℃ for 8 days and then submitted to relining procedure. These denture bases having 1.5 mm-thickness were returned to the master stone casts and were sealed using wax. Flasking procedure was done as described previously. Dewaxing procedure was completed to eliminate all wax around the denture bases. The pins were then placed in the holes on the crest of the ridge following similar procedure described earlier. The bonding agents for Ufi Gel hard C were applied on the intaglio surface of the denture base. The reaction time 30 seconds was given before addition of the resin. The relining resin was injected onto the intaglio surface reline area of treated denture base with automixing gun. The flask closure was completed and adjusted over the hydraulic press to deliver a pressure of 450 kg for 7 minutes till polymerization of relined material occurred. Such twenty relined denture bases were prepared using similar procedure (Fig. 7). These denture bases were kept in distilled water at 37±1℃ for 8 days in incubator before subjecting to disinfection procedure.


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

Nirale RM, Thombre R, Kubasad G - J Adv Prosthodont (2012)

Denture base with relining.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3303917&req=5

Figure 7: Denture base with relining.
Mentions: For the fabrication of relined denture base specimens, 1.5 mm-thick base plate wax was adapted over the standard brass cast. This master die with the adapted wax was used to prepare another silicone 'mould-3', which was used to obtain 20 stone casts (Fig. 6). These casts were 1.5 mm larger than the master brass die on tissue surface. Melted wax was injected in silicone 'mould-1' to get 1.5 mm thick denture base. The 1.5 mm-spaced dental stone cast was placed into the mould to get 1.5 mm-thick-waxed record base. The 1.5 mm-wax denture base along with its respective cast was flasked with dental stone as previously described. These denture bases were stored in water at 37±1℃ for 8 days and then submitted to relining procedure. These denture bases having 1.5 mm-thickness were returned to the master stone casts and were sealed using wax. Flasking procedure was done as described previously. Dewaxing procedure was completed to eliminate all wax around the denture bases. The pins were then placed in the holes on the crest of the ridge following similar procedure described earlier. The bonding agents for Ufi Gel hard C were applied on the intaglio surface of the denture base. The reaction time 30 seconds was given before addition of the resin. The relining resin was injected onto the intaglio surface reline area of treated denture base with automixing gun. The flask closure was completed and adjusted over the hydraulic press to deliver a pressure of 450 kg for 7 minutes till polymerization of relined material occurred. Such twenty relined denture bases were prepared using similar procedure (Fig. 7). These denture bases were kept in distilled water at 37±1℃ for 8 days in incubator before subjecting to disinfection procedure.

Bottom Line: The 1.5 mm of thickness-specimens (n = 20) were relined with 1.5 mm of autopolymerizing relining resin.Data were analyzed using student paired 't' and unpaired 't' test.Chemical disinfection with sodium hypochlorite seems to be a safer method of disinfection with regards to physical properties such as changes in dimensional stability.

View Article: PubMed Central - PubMed

Affiliation: Department of Prosthodontics, Sharad Pawar Dental College and Hospital, Maharashtra, India.

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.

No MeSH data available.


Related in: MedlinePlus