Evaluation of hardness and wear resistance of interim restorative materials.
BACKGROUND
The interim restorative materials should have certain mechanical properties to withstand in oral cavity. The aim of this study was to evaluate the hardness and wear resistance of interim restorative materials.


METHODS
Fifteen identical rectangular shape specimens with dimensions of 2 mm × 10 mm × 30 mm were made from 7 interim materials (TempSpan, Protemp 3 Garant, Revotek, Unifast LC, Tempron, Duralay, and Acropars). The Vickers hardness and abrasive wear of specimens were tested in dry conditions and after 1 week storage in artificial saliva. The depth of wear was measured using surface roughness inspection device. Data were subjected to Kruskal-Wallis and Mann-Whitney tests. The Pearson correlation coefficient was used to determine the relationship between hardness and wear (α =0.05).


RESULTS
TempSpan had the highest hardness. The wear resistance of TempSpan (in dry condition) and Revotek (after conditioning in artificial saliva) was significantly higher (P < 0.05). There was no statistically significant correlation between degree of wear and hardness of the materials (P = 0.281, r = -0.31).


CONCLUSIONS
Hardness and wear resistance of interim resins are material related rather than category specified.
Torabinejad Dental Research Center, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.
Omid
O
Savabi
Farahnaz
F
Nejatidanesh
Mohamad Hossein
MH
Fathi
Amir Arsalan
AA
Navabi
Ghazal
G
Savabi
Acrylic resins; composite resins; dental restorations; dental restorations wear; hardness