Rajkumar, E (2013) Comparative Evaluation of Shear Bond Strength of Cast and Direct Metal Laser Sintered Co-Cr Alloy To Porcelain with the effect of Surface Treatments - An In Vitro Study. Masters thesis, Ragas Dental College & Hospital, Chennai.
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Abstract
PURPOSE OF STUDY : The present in vitro study was conducted for the comparative evaluation of shear bond strength of cast Co-Cr alloy and the direct metal laser sintering (DMLS) Co-Cr alloy to dental porcelain with the effect of sand blasting and laser etching surface treatments. MATERIALS AND METHODS : Twenty cast Co-Cr alloy and twenty DMLS Co-Cr alloy specimens were fabricated and divided into four groups (Group I, II, III & IV). The alloy surfaces were surface treated with sand blasting and laser etching procedures. Dental porcelain was applied on cast and DMLS Co-Cr alloy. Ten test samples were prepared for each group for bond strength comparison. All samples were tested for shear bond strength in Universal testing machine and the results were calculated for statistical analysis. The samples were qualitatively analysed by SEM and EDX analysis to correlate the results with above. RESULTS : The highest shear bond strength value was obtained with laser sintered Co-Cr alloys-ceramic test samples after laser etching (Group IV- 72.38 ± 0.89 MPa) followed by cast Co-CR alloy-ceramic test samples after laser etching (Group II- 72.27 ± 0.91MPa), followed by laser sintered Co-Cr alloy- ceramic test samples after sand blasting (Group III- 71.01± 1.97 MPa) and least by cast Co-Cr alloy- ceramic after sand blasting (Group I- 70.21±2.69 MPa) Group IV >Group> II >Group III> Group I CONCLUSION : The DMLS metal ceramic system exhibited a bonding strength that exceeds the requirement of ISO 9691:1999. Surface treatment with laser etching on the surface of DMLS Co–Cr alloy improved the bond strength when compared to sand blasting. The new laser sintering technique for Co-Cr alloy (DMLS) seems to be an alternative technique to conventional casting of dental alloys for porcelain fused to metal restorations.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Laser sintering ; laser etching ; DMLS ; Sand blasting ; Shear bond strength. |
| Subjects: | DENTAL > Prosthodontics and Crown and Bridge |
| Depositing User: | Thavamani K |
| Date Deposited: | 11 Jul 2017 17:15 |
| Last Modified: | 17 Sep 2021 02:31 |
| URI: | http://repository-tnmgrmu.ac.in/id/eprint/1483 |
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