Effects of six surface treatment methods on the surface roughness of a low-fusing and an ultra low-fusing feldspathic ceramic material.
OBJECTIVE
The purpose of this in vitro study was to determine the effects of six surface treatment methods on the surface roughness of two feldspathic ceramic materials.


METHODS
One hundred twenty metal discs were cast (Remanium CS). A low-fusing feldspathic ceramic (Vita Omega 900) was fired onto 60 metal discs, and an ultra low-fusing feldspathic ceramic (Finesse) was fired onto the other 60 metal discs. Six surface treatment methods were selected: (1) autoglazing (AUG), (2) overglazing (OVG), (3) polishing (POL), (4) fine diamond disc grinding + polishing + autoglazing (FDPA), (5) coarse diamond disc grinding + polishing + autoglazing (CDPA), (6) polishing + autoglazing (PA). Omega specimens were assigned to six experimental groups representing six surface treatment methods (Om-AUG, Om-OVG, Om-POL, Om-FDPA, Om-CDPA, Om-PA) (n = 10). Finesse specimens were also assigned to six experimental groups (Fn-AUG, Fn-OVG, Fn-POL, Fn-FDPA, Fn-CDPA, Fn-PA) (n = 10). Treated ceramic surfaces were examined by means of profilometry and transmission electron microscopy.


RESULTS
In Omega groups mean roughness values ranged as follows: group Om-AUG = Om-POL > Om-OVG > Om-CDPA = Om-FDPA > Om-PA (p < 0.001). No significant difference was found between groups Om-AUG/Om-POL and Om-CDPA/Om-FDPA (p > 0.05). In Finesse groups mean roughness values ranged as follows: Fn-CDPA > Fn-FDPA = Fn-AUG = Fn-POL = Fn-OVG > Fn-PA (p < 0.001). No significant difference was found between Fn-FDPA, Fn-AUG, Fn- POL and Fn-OVG (p > 0.05).


CONCLUSIONS
For both ceramic types, the smoothest surfaces were obtained with polishing prior to autoglazing. Diamond disc grinding prior to polishing and autoglazing (Fn-FDPA, Fn-CDPA) displayed the roughest surfaces in ultra low-fusing ceramic (Finesse). Autoglazing alone and polishing displayed the roughest surfaces in low-fusing ceramic material (Om-AUG, Om-POL).
Dalkiz
Mehmet
M
Department of Prosthodontics, Dental Sciences Center, Gulhane Military Medical Academy, Ankara, Turkey.
Sipahi
Cumhur
C
Beydemir
Bedri
B
D000537:Aluminum Oxide / Q000737:chemistry; D000538:Aluminum Silicates / Q000737:chemistry*; D002516:Ceramics / Q000737:chemistry; D002858:Chromium Alloys / Q000737:chemistry; D001840:Dental Bonding; D045662:Dental Etching; D003775:Dental Polishing / Q000295:instrumentation / Q000379:methods; D003776:Dental Porcelain / Q000737:chemistry*; D018130:Diamond / Q000737:chemistry; D006358:Hot Temperature; D006801:Humans; D008422:Materials Testing; D046529:Microscopy, Electron, Transmission; D017680:Potassium Compounds / Q000737:chemistry*; D013499:Surface Properties; D014867:Water / Q000737:chemistry
D000538:Aluminum Silicates; D002858:Chromium Alloys; D017680:Potassium Compounds; C110711:vita omega; D014867:Water; D003776:Dental Porcelain; C016447:feldspar; C037884:finesse; D018130:Diamond; D000537:Aluminum Oxide