Three-dimensional trueness and margin quality of monolithic zirconia restorations fabricated by additive 3D gel deposition |
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| Affiliation: | 1. Center of Digital Dentistry, Department of Prosthodontics, Peking University School and Hospital of Stomatology, National Engineering Laboratory for Digital and Material Technology of Stomatology, Research Center of Engineering and Technology for Digital Dentistry of Ministry of Health, Beijing Key Laboratory of Digital Stomatology, National Clinical Research Center for Oral Disease 100081, Beijing, China;2. Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, S-106 91 Stockholm, Sweden;1. Department of Advanced Oral Sciences and Therapeutics, University of Maryland School of Dentistry, Baltimore, MD, USA;2. Central Texas Veterans Health Care System, Temple, TX, USA;3. Institute for Medical Biometry and Statistics, Faculty of Medicine and, Medical Center, University of Freiburg, Germany;4. Department of Operative Dentistry, Periodontology, and Endodontology, University of Dental Medicine and Oral Health, Danube Private University, Krems, Austria;5. Department of Prosthetic Dentistry, Center for Dental Medicine, Medical Center – University of Freiburg, Freiburg, Germany;1. Department of Prosthodontics, Propaedeutics and Dental Materials, School of Dentistry, Christian-Albrechts University, Kiel, Germany;2. Department of Removable Prosthodontics, Faculty of Oral and Dental Medicine, Cairo University, Cairo, Egypt;1. Department of Biomedical and Neuromotor Sciences, Alma Mater Studiorum - University of Bologna, Bologna, Italy;2. Private practice, Battipaglia (SA), Italy;3. Private practice, Bari, Italy;4. Department of Neurosciences, University of Padova, Padova, Italy;1. Department of Periodontology and Community Oral Health, Faculty of Dentistry, Universiti Sains Islam Malaysia, Level 15, Tower B, Persiaran MPAJ, 55100, Pandan Indah, Kuala Lumpur, Malaysia;2. Unit Periodontology, Department of Restorative Dentistry, Faculty of Dentistry, Universiti Kebangsaan Malaysia, Jalan Raja Muda Abdul Aziz, 50300, Kuala Lumpur, Malaysia;3. Department of Mechanical and Nuclear Engineering, University of Sharjah, P.O. Box 27272, Sharjah, United Arab Emirates;4. Department of Mechanical & Manufacturing Engineering, Faculty of Engineering & Built Environment, Universiti Kebangsaan Malaysia, 43600, UKM Bangi, Selangor, Malaysia;1. Nihon University Graduate School of Dentistry at Matsudo, Removable Prosthodontics, Matsudo, Japan;2. Department of Removable Prosthodontics, Nihon University School of Dentistry at Matsudo, Matsudo, 2-870-1 Sakaecho-nishi, Chiba 271-8587, Japan;3. Department of Anesthesiology, Nihon University School of Dentistry at Matsudo, Matsudo, Japan;1. Harinakano Family Dentistry, Japan;2. Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Japan |
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| Abstract: | PurposeThe aim of this in vitro study was to evaluate the three-dimensional trueness and margin quality of monolithic zirconia restorations fabricated by additive 3D gel deposition, compared with those by subtractive milling.MethodsTen single crowns and ten 4-unit FPDs of different occlusal geometries and margin thickness were fabricated by additive 3D gel deposition (additive group) and subtractive milling (subtractive group). An intraoral scanner was used to digitalize the restorations. 3D deviation analysis was applied and root mean square (RMS) was used to assess the trueness. Margin quality was characterized using optical stereomicroscopy and 3D laser scanning microscopy.ResultsFor single crowns with shallow fossae and grooves and normal margin, RMS value of additive group and subtractive group showed no significant difference in external surface, while additive group showed higher RMS value in intaglio surface. As for 4-unit FPDs with deep fossae and grooves and thin margin, RMS value of additive group in external surface was significantly lower than that of subtractive group and in intaglio surface there was no significant difference between two groups. With a 0.5 mm chamfer design, single crowns in additive group showed flawless margin with a smooth contour line, whereas minor flaws could be observed in 4-unit FPDs with thin margin. In subtractive group, restorations showed minor flaws or defects of various number and severity.ConclusionsMonolithic zirconia restorations fabricated by additive 3D gel deposition have comparable trueness and better margin quality than those fabricated by subtractive milling. Besides it is more capable of enabling complex geometry. |
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