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KMID : 1023820150070040312
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The Journal of Advanced Prosthodontics
2015 Volume.7 No. 4 p.312 ~ p.316
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In vitro evaluation of the bond strength between various ceramics and cobalt-chromium alloy fabricated by selective laser sintering
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Bae Eun-Jeong
Kim Hae-Young
Kim Woong-Chul
Kim Ji-Hwan
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Abstract
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PURPOSE : This study aimed to present the clinical applicability of restorations fabricated by a new method, by comparing the bond strength of between ceramic powder with different coefficient of thermal expansion and alloys fabricated by Selective laser sintering (SLS).
MATERIALS AND METHODS : Fifty Co-Cr alloy specimens (25.0 × 3.0 × 0.5 mm) were prepared by SLS and fired with the ceramic (8.0 × 3.0 × 0.5 mm) (ISO 9693:1999). For comparison, ceramics with different coefficient of thermal expansion were used. The bond strength was measured by three-point bending testing and surfaces were observed with FE-SEM. Results were analyzed with a one-way ANOVA (α=.05).
RESULTS : The mean values of Duceram Kiss (61.18 ± 6.86 MPa), Vita VM13 (60.30 ± 7.14 MPa), Ceramco 3 (58.87 ± 5.33 MPa), Noritake EX-3 (55.86 ± 7.53 MPa), and Vintage MP (55.15 ± 7.53 MPa) were found. No significant difference was observed between the bond strengths of the various metal-ceramics. The surfaces of the specimens possessed minute gaps between the additive manufactured layers.
CONCLUSION : All the five powders have bond strengths higher than the required 25 MPa minimum (ISO 9693); therefore, various powders can be applied to metal structures fabricated by SLS.
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KEYWORD
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Rapid prototyping, Selective Laser Sintering, Dental technique, Bond strength, Coefficient of thermal expansion
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