engleski

Effects of surface treatment of powder metallurgy manufactured titanium on bond strenght to veneering ceramics

Commercially pure titanium (CP Ti) manufactured by cold isostatic and hot vacuum pressing (CIP/HVP) processes of powder metallurgy (PM) has not yet been used in dental prosthodontics. The aim of this study was to evaluate the effects of surface modifications of CP Ti substructures manufactured by powder metallurgy processes on bond strength with three veneering ceramics. 120 samples of CP Ti manufactured by PM shaped on WEDM were divided into 5 groups according to surface modifications: 1. untreated ; 2. sandblasted (Al2O3) ; 3. applied bonding agent ; 4. sandblasted (Al2O3) and applied bonding agent ; 5. etched with hydrochloric acid. All samples were veneered with low fusing dental ceramics. Each group was divided into 3 subgroups of 8 samples according to veneering ceramics. Bond strength evaluation was done according to ISO 9693. The surface of the samples was evaluated by SEM and EDS analysis before and after modifications, after applying veneering ceramics, and after debonding. Bond strength values were measured and results were compared to ISO 9693 requirements (>25 MPa). The results of bond strength testing showed the following values: Duceratin Kiss veneering ceramics values range from 25, 6 MPa to 41, 2 MPa ; Initial Ti from 12, 7 MPa to 38, 5 MPa ; Titankeramik from 17, 3 MPa to 38, 5 MPa. ANOVA showed statistically significant differences in bond strength values within a group of veneering ceramics relative to surface treatment for the Duceratin Kiss group 4, the Initial Ti group 2 and the Titankeramik group 2. No statistically significant differences in bond strength values were determined between the veneering ceramics. The SEM and EDS analyses showed predominantly adhesive fractures between veneering ceramics and metal samples. CP Ti manufactured by PM and veneered with low fusing ceramics meets requirements from ISO 9693 and could be used in prosthodontics as a metal base material in metal–ceramic systems.

titanium ; powder metallurgy ; low fusing ceramics ; surface treatment

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