Effect of incorporation of disinfectant solutions on setting time, linear dimensional stability, and detail reproduction in dental stone casts.
OBJECTIVE
The aim of this paper was to analyze the influence of incorporation of disinfectants during the cast die stone-setting time. Setting time, linear dimensional stability, and reproduction details on casts were measured.


METHODS
Die stone type IV specimens with disinfection solutions (sodium hypochlorite 1%, glutaraldehyde 2%, chlorhexidine 2%) were incorporated in two concentrations (50%, 100%). The detail reproduction, dimensional stability, and setting time were tested in accordance with ADA recommendations.


RESULTS
Disinfecting solutions promoted an increase in setting time compared to control; sodium hypochlorite was responsible for the highest setting time. The addition of undiluted sodium hypochlorite 1.0% led to contraction during setting, but the groups with 50% diluted sodium hypochlorite 1.0% and undiluted chlorhexidine 2.0% resulted in intermediate values compared to the other groups, thus matching the control. The others did not demonstrate any effect on expansion. For detail reproduction, it was observed that the control group presented results similar to the others, except those where sodium hypochlorite was added.


CONCLUSIONS
The addition of sodium hypochlorite in both dilutions significantly altered, negatively, all the evaluated properties. But the addition of glutaraldehyde and chlorhexidine did not promote any significant alterations in the evaluated properties.
Lucas
Matheus Guilherme
MG
Department of Dental Materials and Prosthodontics, Araraquara Dental School, São Paulo State University (UNESP), 1680-CEP 14801-903, CP 301, Araraquara, São Paulo, Brazil. lucasmatheus@hotmail.com
Arioli-Filho
João Neudenir
JN
Nogueira
Sergio Sualdini
SS
Batista
André Ulisses Dantas
AU
Pereira
Rodrigo De Paula
Rde P
D002133:Calcium Sulfate / Q000737:chemistry; D002710:Chlorhexidine / Q000737:chemistry; D003734:Dental Casting Investment / Q000737:chemistry*; D003735:Dental Casting Technique; D019551:Dental Disinfectants / Q000737:chemistry*; D003779:Denture Design / Q000379:methods*; D004305:Dose-Response Relationship, Drug; D005976:Glutaral / Q000737:chemistry; D006244:Hardness; D006801:Humans; D003765:Models, Dental; D012973:Sodium Hypochlorite / Q000737:chemistry; D018709:Statistics, Nonparametric
D003734:Dental Casting Investment; D019551:Dental Disinfectants; D012973:Sodium Hypochlorite; D002710:Chlorhexidine; D005976:Glutaral; D002133:Calcium Sulfate