Authors: Ll Nogués J MartinezGomis C Molina M Peraire J Salsench P Sevilla F J Gil
Publish Date: 2008/04/04
Volume: 19, Issue: 9, Pages: 3041-3048
Abstract
The purpose of this study was to evaluate the long term effect of abrasivity of toothpastes normally used over the surface and mechanical properties of dental casting alloys Three dental casting alloys Ni–Cr Co–Cr cp Ti and one ceramic were chosen Four specimens of each material were immersed in artificial saliva brushed without or with one of four toothpastes of different Relative Dentine Abrasivity RDA 50 52 80 and 114 An electric toothbrush with a load of 250 g was used for 420 min Mass loss was determined by difference in weight microhardness and surface roughness were also measured Twoway ANOVA and nonparametric tests were used to detect significant differences Titanium specimens 478 μg/cm2 exhibited the most mass loss whereas ceramic 282 μg/cm2 and Co–Cr 262 μg/cm2 exhibited the least However ceramic demonstrated the most volume loss 0239 mm3 The abrasivity effect of the toothpaste correlated with the RDA values Slight variations in microhardness were observed after toothbrushing and depended on the material but not on the toothpaste used Material surfaces were slightly smoothed by toothbrushing but no significant differences were detected Dental casting alloys and ceramic are susceptible to abrasion by brushing with an electric toothbrush depending on the RDA value of the toothpaste Variations in microhardness and surface roughness were not clinically relevantThis study was supported in part by a grant of Fundació Josep Finestres FBG 302982/2004 The authors are grateful to the technicians Narcís Ros Francisco Sacristán and Joan Mestres for producing the specimens and Robin Rycroft for language assistance The authors also thank Dentaurum® and BraunOralB® for their contribution of investment and power toothbrushes respectively
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