Harish V1, Mohamed Ali S A2, Jagadesan N3, Mohamed Ifthikar4, Siva Senthil2, Debasish Basak5, Febel Huda6. 1. Assistant Professor, Department of Prosthodontics, Srimuthukumaran Medical College , Chennai, India . 2. Assistant Professor, Department of Prosthodontics, Indira Gandhi institute of Dental Sciences , Pondicherry, India . 3. Assistant Professor, Department of Prosthodontics, Menakshi ammal Dental College , Chennai, India . 4. Consultant Endodontist & Private practioner, Pondicherry, India . 5. Consultant Prosthodontist & Private Practioner, West Bengal, India . 6. Consultant Prosthodontist, Vasan Dental Care , Trichy, India .
Abstract
INTRODUCTION: The high strength porcelain fused metal crowns have been extensively used in dentistry. However, the fit is the most encountered problems in porcelain fused metal crowns. This mainly depends on the fabrication technique. AIM: The purpose was to compare the internal and marginal fit of laser sintered and conventionally casted Cobalt-Chromium copings. MATERIALS AND METHODS: Twenty stainless steel dies of dimension 15 x 10 mm with 1 mm finish margin were fabricated using CAD-CAM technology. Twenty dies were divided into two groups Group 1 and Group 2 containing 10 samples each. All 20 dies were scanned using LAVA 3M scanner and data were used to fabricate metal copings using Laser sintering technique (Group-1) and Conventional casting technique (Group-2). Copings were cemented onto respective dies and finished and standardized sectioning were made. The sectioned models were scanned under stereomicroscope at 50 x magnification for internal and marginal fit evaluation. RESULTS: Mean and standard deviation of internal and marginal discrepancy of laser sintered copings/conventional cast metal copings was 107.6 ± 10.9μ and 102.1 ± 17.2μ/187.09 ± 11.47 μ and 176.57 ± 25.82 μ respectively. Statistical analysis showed the laser sintered copings have lesser internal and marginal discrepancy than conventional casted copings with p value < 0.001. CONCLUSION: The laser sintered Co-Cr copings showed better internal and marginal fit when compared to that of conventional Co-Cr casted copings.
INTRODUCTION: The high strength porcelain fused metal crowns have been extensively used in dentistry. However, the fit is the most encountered problems in porcelain fused metal crowns. This mainly depends on the fabrication technique. AIM: The purpose was to compare the internal and marginal fit of laser sintered and conventionally casted Cobalt-Chromium copings. MATERIALS AND METHODS: Twenty stainless steel dies of dimension 15 x 10 mm with 1 mm finish margin were fabricated using CAD-CAM technology. Twenty dies were divided into two groups Group 1 and Group 2 containing 10 samples each. All 20 dies were scanned using LAVA 3M scanner and data were used to fabricate metal copings using Laser sintering technique (Group-1) and Conventional casting technique (Group-2). Copings were cemented onto respective dies and finished and standardized sectioning were made. The sectioned models were scanned under stereomicroscope at 50 x magnification for internal and marginal fit evaluation. RESULTS: Mean and standard deviation of internal and marginal discrepancy of laser sintered copings/conventional cast metal copings was 107.6 ± 10.9μ and 102.1 ± 17.2μ/187.09 ± 11.47 μ and 176.57 ± 25.82 μ respectively. Statistical analysis showed the laser sintered copings have lesser internal and marginal discrepancy than conventional casted copings with p value < 0.001. CONCLUSION: The laser sintered Co-Cr copings showed better internal and marginal fit when compared to that of conventional Co-Cr casted copings.
Entities:
Keywords:
Cobalt chromium alloy; Laser sintered; Metal crowns; Porcelain fused metal crowns
Authors: Izabela C M Moris; Silas Borges Monteiro; Raíssa Martins; Ricardo Faria Ribeiro; Erica A Gomes Journal: Biomed Res Int Date: 2018-01-23 Impact factor: 3.411