Effect of different denture cleansers on surface roughness and microhardness of artificial denture teeth.
OBJECTIVE
The aim of this study was to compare the effects of different denture cleansers on the surface roughness and microhardness of various types of posterior denture teeth.


METHODS
168 artificial tooth specimens were divided into the following four subgroups (n=42): SR Orthotyp PE (polymethylmethacrylate); SR Orthosit PE (Isosit); SR Postaris DCL (double cross-linked); and SR Phonares II (nanohybrid composite). The specimens were further divided according to the type of the denture cleanser (Corega Tabs (sodium perborate), sodium hypochlorite (NaOCl), and distilled water (control) (n=14)) and immersed in the cleanser to simulate a 180-day immersion period, after which the surface roughness and microhardness were tested. The data were analyzed using the Kruskal-Wallis test, Conover's nonparametric multiple comparison test, and Spearman's rank correlation analysis (P<.05).


RESULTS
A comparison among the denture cleanser groups showed that NaOCl caused significantly higher roughness values on SR Orthotyp PE specimens when compared with the other artificial teeth (P<.001). Furthermore, Corega Tabs resulted in higher microhardness values in SR Orthotyp PE specimens than distilled water and NaOCl (P<.005). The microhardness values decreased significantly from distilled water, NaOCl, to Corega Tabs for SR Orthosit PE specimens (P<.001). SR Postaris DLC specimens showed increased microhardness when immersed in distilled water or NaOCl when compared with immersion in Corega Tabs (P<.003). No correlation was found between surface roughness and microhardness (r=0.104,P=.178).


CONCLUSIONS
NaOCl and Corega Tabs affected the surface roughness and microhardness of all artificial denture teeth except for the new generation nanohybrid composite teeth.
Department of Prosthodontics, Faculty of Dentistry, Baskent University, Ankara, Turkey.
Bulem
B
Yuzugullu
Department of Prosthodontics, Faculty of Dentistry, Baskent University, Ankara, Turkey.
Ozlem
0000-0002-2866-1308
O
Acar
Department of Prosthodontics, Faculty of Dentistry, Baskent University, Ankara, Turkey.
Cem
C
Cetinsahin
Department of Restorative Dentistry, Faculty of Dentistry, Baskent University, Ankara, Turkey.
Cigdem
C
Celik
Complete denture; Denture cleansers; Mechanical properties; Physical properties; Sodium hypochlorite; Sodium perborate