Fracture Mechanics, Microstructure and Elemental Composiotion of Lithography Sintered Ceramic
Objectives: Lithography based ceramic manufacturing (LCM) is an additive technique which is an alternative to subtractive CAD/CAM technology in dental applications. LCM has some advantages compared to conventional methods:manufacturing time and cost are reduced and mechanical properties are claimed to be high. The aim of this study was to compare the fracture mechanics, microstructure and elemental composition of LCM ceramic specimens with pressing and CAD/CAM methods.
Methods: Disc-shaped specimens with 16 mm diameter and 1.2 mm thickness were used for mechanical testing in the present study (n=10/group). The biaxial flexural strength of 3 groups (In-Ceram Alumina, Lithography based Alumina and ZirkonZahn) were determined using ‘piston on 3 ball’ technique as suggested in test Standard ISO 6872. Vickers hardness test was performed. Results were statistically analyzed using one-way ANOVA followed by post-hoc Dunnett T3 test. Polished surface microstructure and fracture surface characterization were made with SEM. EDS was used for elemental analysis.
Results: The mean biaxial flexural strength of In-Ceram Alumina (ICA) was 147.3 MPa, Lithography based Alumina (LCMA) was 490.1 MPa and ZirkonZahn was 708.9 MPa. Vickers hardness of ICA was 850 VHN, LCMA was 1581 VHN, and ZirkonZahn was 1249 VHN. When the SEM images were examined, a homogeneous distribution was not observed in In-Ceram Alumina specimens whereas there was quite homogeneous microstructure for LCM Alumina and ZirkonZahn groups. EDS results were found to support the SEM images.
Conclusions: Within the limitations of this study, it can be concluded that this new production method seems to be promising for ceramic structure manufacturing.
Division: IADR/AADR/CADR General Session
Meeting:2015 IADR/AADR/CADR General Session (Boston, Massachusetts) Location: Boston, Massachusetts
Year: 2015 Final Presentation ID:3696 Abstract Category|Abstract Category(s):Dental Materials 3: Ceramic-based Materials and Cements