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Svanborg P, Le HH, Sigurðardóttir SJ, Barkarmo S. Shear bond strength of the ceramic veneer to additively manufactured titanium. Clin Exp Dent Res 2024; 10:e820. [PMID: 38044540 PMCID: PMC10860562 DOI: 10.1002/cre2.820] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2023] [Revised: 11/07/2023] [Accepted: 11/15/2023] [Indexed: 12/05/2023] Open
Abstract
OBJECTIVES The objective of this in vitro study was to evaluate the shear bond strength between the ceramic veneer and additively manufactured titanium with different surface treatments, and to compare with milled titanium. Also, to characterize the surface and the presence of an α-case layer of additively manufactured and milled titanium. MATERIAL AND METHODS Sixty additively manufactured titanium grade 23, and 20 milled titanium grade 4 cylindrical specimens were divided into four groups based on surface treatments, air-particle abrasion and grinding. After ceramic veneering half of each group were thermocycled. The bond strength was analyzed using a shear bond strength test. The surfaces were analyzed using interferometry and scanning electron microscopy. RESULTS The grinding procedure and air-particle abrading pressure had no significant effect on the shear bond strength (p = .264 and p = .344). Thermocycling showed a tendency towards an effect but not significant (p = .052). The group with the highest air-abrading pressure showed the highest surface roughness. No presence of an α-case layer was detected in any of the groups. CONCLUSION Additively manufactured titanium grade 23 may be veneered with ceramics without prior grinding of the surfaces.
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Affiliation(s)
- P. Svanborg
- Department of Prosthodontics/Dental Materials Science, Institute of Odontology, The Sahlgrenska AcademyUniversity of GothenburgGöteborgSweden
| | - H. H. Le
- Department of Prosthodontics/Dental Materials Science, Institute of Odontology, The Sahlgrenska AcademyUniversity of GothenburgGöteborgSweden
| | - S. J. Sigurðardóttir
- Department of Prosthodontics/Dental Materials Science, Institute of Odontology, The Sahlgrenska AcademyUniversity of GothenburgGöteborgSweden
| | - S. Barkarmo
- Department of Prosthodontics/Dental Materials Science, Institute of Odontology, The Sahlgrenska AcademyUniversity of GothenburgGöteborgSweden
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Liu CM, Lin WC, Lee SY. Evaluation of the efficiency, trueness, and clinical application of novel artificial intelligence design for dental crown prostheses. Dent Mater 2024; 40:19-27. [PMID: 37858418 DOI: 10.1016/j.dental.2023.10.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2023] [Revised: 09/05/2023] [Accepted: 10/05/2023] [Indexed: 10/21/2023]
Abstract
OBJECTIVE The unique structure of human teeth limits dental repair to custom-made solutions. The production process requires a lot of time and manpower. At present, artificial intelligence (AI) has begun to be used in the medical field and improve efficiency. This study attempted to design a variety of dental restorations using AI and evaluate their clinical applicability. METHODS Using inlay and crown restoration types commonly used in dental standard models, we compared differences in artificial wax-up carving (wax-up), artificial digital designs (digital) and AI designs (AI). The AI system was designed using computer calculations, and the other two methods were designed by humans. Restorations were made by 3D printing resin material. Image evaluations were compared with cone beam computed tomography (CBCT) by calculating the root mean squared error. RESULTS Surface truth results showed that AI (68.4 µm) and digital-designed crowns (51.0 µm) had better reproducibility. Using AI for the crown reduced the time spent by 400% (compared to digital) and 900% (compared to wax-up). Optical microscopic and CBCT images showed that AI and digital designs had close margin gaps (p < 0.05). The margin gap of the crown showed that the wax-up group was 4.1 and 4.3 times greater than those of the AI and digital crowns, respectively. Therefore, the utilization of artificial intelligence can assist in the production of dental restorations, thereby enhancing both production efficiency and accuracy. SIGNIFICANCE It is expected that the development of AI can contribute to the reproducibility, efficiency, and goodness of fit of dental restorations.
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Affiliation(s)
- Che-Ming Liu
- Department of Dentistry, Wan-Fang Hospital, Taipei Medical University, Taipei 116, Taiwan; School of Dentistry, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan
| | - Wei-Chun Lin
- Department of Dentistry, Wan-Fang Hospital, Taipei Medical University, Taipei 116, Taiwan; Center for Tooth Bank and Dental Stem Cell Technology, Taipei Medical University, Taipei 110, Taiwan; School of Dental Technology, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan.
| | - Sheng-Yang Lee
- Department of Dentistry, Wan-Fang Hospital, Taipei Medical University, Taipei 116, Taiwan; School of Dentistry, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan; Center for Tooth Bank and Dental Stem Cell Technology, Taipei Medical University, Taipei 110, Taiwan.
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Lu TY, Lin WC, Yang TH, Sahrir CD, Shen YK, Feng SW. The Influence of Dental Virtualization, Restoration Types, and Placement Angles on the Trueness and Contact Space in 3D-Printed Crowns: A Comprehensive Exploration. Dent J (Basel) 2023; 12:2. [PMID: 38275677 PMCID: PMC10814425 DOI: 10.3390/dj12010002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2023] [Revised: 12/05/2023] [Accepted: 12/18/2023] [Indexed: 01/27/2024] Open
Abstract
The current digital dentistry workflow has streamlined dental restoration production, but the effectiveness of digital virtual design and 3D printing for restorations still needs evaluation. This study explores the impact of model-free digital design and 3D-printing placement angles on restorations, including single crowns and long bridges produced with and without casts. The restorations are 3D printed using resin at placement angles of 0°, 60°, and 90°. Each group of samples was replicated ten times, resulting in a total of 120 restorations. The Root Mean Square Error (RMSE) value was used to evaluate the surface integrity of the restoration. In addition, the contact space, edge gap, and occlusal space of restorations produced by different processes were recorded. The results indicate that there was no significant difference in the RMSE value of the crown group (p > 0.05). Changing the bridge restoration angle from 0° to 90° resulted in RMSE values increasing by 2.02 times (without casts) and 2.39 times (with casts). Furthermore, the marginal gaps in the crown group were all less than 60 μm, indicating good adaptation. In contrast, the bridge group showed a significant increase in marginal gaps at higher placement angles (p > 0.05). Based on the findings, virtual fabrication without casts does not compromise the accuracy of dental restorations. When the position of the long bridge exceeds 60 degrees, the error will increase. Therefore, designs without casts and parallel placement result in higher accuracy for dental restorations.
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Affiliation(s)
- Tsung-Yueh Lu
- School of Dentistry, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan
| | - Wei-Chun Lin
- School of Dental Technology, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan
- Department of Dentistry, Wan-Fang Hospital, Taipei Medical University, Taipei 116, Taiwan
- Center for Tooth Bank and Dental Stem Cell Technology, Taipei Medical University, Taipei 110, Taiwan
| | - Tzu-Hsuan Yang
- School of Dental Technology, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan
| | - Citra Dewi Sahrir
- School of Dentistry, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan
| | - Yung-Kang Shen
- School of Dental Technology, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan
| | - Sheng-Wei Feng
- School of Dentistry, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan
- Division of Prosthodontics, Department of Dentistry, Taipei Medical University Hospital, Taipei 110, Taiwan
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Park YH, Kim KA, Lee JJ, Kwon TM, Seo JM. Effect of abutment neck taper and cement types on the amount of remnant cement in cement-retained implant restorations: an in vitro study. J Adv Prosthodont 2022; 14:162-172. [PMID: 35855317 PMCID: PMC9259346 DOI: 10.4047/jap.2022.14.3.162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2022] [Revised: 04/30/2022] [Accepted: 06/08/2022] [Indexed: 11/21/2022] Open
Abstract
PURPOSE The present study aims to analyze the effect of abutment neck taper and types of cement on the amount of undetected remnant cement of cement-retained implant prostheses. MATERIALS AND METHODS Three neck taper angles (53°, 65°, 77°) and three types of cement (RMGI: resin-modified glass ionomer, ZPC: zinc phosphate cement, ZOE: zinc oxide eugenol cement) were used. For each group, the surface percentage was measured using digital image and graphic editing software. The weight of before and after removing remnant cement from the abutment-crown assembly was measured using an electronic scale. Two-way ANOVA and Duncan & Scheffe’s test were used to compare the calculated surface percentage and weight of remnant cement (α = .05). RESULTS There were significant differences in remnant cement surface percentage and weight according to neck taper angles (P < .05). However, there were no significant differences in remnant cement surface percentage and weight on types of cement. No interaction was found between neck taper angles and types of luting cement (P > .05). The wide abutment with a small neck taper angle showed the most significant amount of remnant cement. And the types of luting cement did not influence the amount of residual cement. CONCLUSION To remove excess cement better, the emergence profile of the crown should be straight to the neck taper of the abutment in cement-retained implant restoration.
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Affiliation(s)
- Yeon-Hee Park
- Department of Prosthodontics, School of Dentistry, Jeonbuk National University, Research Institute of Clinical Medicine of Jeonbuk National University - Biomedical Research Institute of Jeonbuk National University Hospital, Jeonju, Republic of Korea
| | - Kyoung-A Kim
- Department of Dentistry, Daejeon Konyang Medical Center, Konyang University, School of Medicine, Daejeon, Republic of Korea
| | - Jung-Jin Lee
- Department of Prosthodontics, School of Dentistry, Jeonbuk National University, Research Institute of Clinical Medicine of Jeonbuk National University - Biomedical Research Institute of Jeonbuk National University Hospital, Jeonju, Republic of Korea
| | - Tae-Min Kwon
- Department of Prosthodontics, School of Dentistry, Jeonbuk National University, Research Institute of Clinical Medicine of Jeonbuk National University - Biomedical Research Institute of Jeonbuk National University Hospital, Jeonju, Republic of Korea
| | - Jae-Min Seo
- Department of Prosthodontics, School of Dentistry, Jeonbuk National University, Research Institute of Clinical Medicine of Jeonbuk National University - Biomedical Research Institute of Jeonbuk National University Hospital, Jeonju, Republic of Korea
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Kümbüloğlu Ö, Koyuncu B, Yerlioğlu G, Al-Haj Husain N, Özcan M. Stress Distribution on Various Implant-Retained Bar Overdentures. MATERIALS 2022; 15:ma15093248. [PMID: 35591581 PMCID: PMC9101733 DOI: 10.3390/ma15093248] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Revised: 04/24/2022] [Accepted: 04/27/2022] [Indexed: 02/01/2023]
Abstract
The purpose of this study was to evaluate the effects of various fabrication techniques and materials used in implant-supported mandibular overdentures with a Hader bar attachment over added stress distribution. Three-dimensional geometric solid models, consisting of two implants (3.3 mm × 12 mm) placed at the bone level on both mandibular canine regions and a Hader bar structure, were prepared. Model 1 simulated a bar retentive system made from Titanium Grade 5 material by Computer Numerical Control (CNC) milling technique without using any converting adapter/multi-unit element on the implants, while Model 2 simulated the same configuration, but with converting adapters on the implants. Model 3 simulated a bar retentive system made from Cobalt-Chromium material, made by using conventional casting technique with converting adapters on the implants. Static loads of 100 Newton were applied on test models from horizontal, vertical and oblique directions. ANSYS R15.0 Workbench Software was used to compare Von Mises stress distribution and minimum/maximum principal stress values, and the results were evaluated by using Finite Element Analysis method. As a result, the highest stress distribution values under static loading in three different directions were obtained in Model 1. Stress was observed intensely around the necks of the implants and the surrounding cortical bone areas in all models. In scope of the results obtained, using converting adapters on implants has been considered to decrease transmission of forces onto implants and surrounding bone structures, thus providing a better stress distribution. It has also been observed that the type of material used for bar fabrication has no significant influence on stress values in those models where converting adapters were used.
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Affiliation(s)
- Övül Kümbüloğlu
- Department of Prosthodontics, Ege University Faculty of Dentistry, Izmir 35040, Turkey; (Ö.K.); (G.Y.)
| | - Beril Koyuncu
- Department of Prosthodontics, Ege University Faculty of Dentistry, Izmir 35040, Turkey; (Ö.K.); (G.Y.)
- Correspondence: ; Tel.: +90-232-311-2877
| | - Gözde Yerlioğlu
- Department of Prosthodontics, Ege University Faculty of Dentistry, Izmir 35040, Turkey; (Ö.K.); (G.Y.)
- Private Practice at RadixDent, Hurriyet Road, Kordonboyu, No:60, Kartal 34860, Turkey
| | - Nadin Al-Haj Husain
- Department of Reconstructive Dentistry and Gerodontology, School of Dental Medicine, University of Bern, 3010 Bern, Switzerland;
- Division of Dental Biomaterials, Center of Dental Medicine, Clinic for Reconstructive Dentistry, University of Zurich, 8032 Zurich, Switzerland;
| | - Mutlu Özcan
- Division of Dental Biomaterials, Center of Dental Medicine, Clinic for Reconstructive Dentistry, University of Zurich, 8032 Zurich, Switzerland;
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Munusamy SM, Yap AU, Ching HL, Yahya NA. Degradation of Computer-aided Design/Computer-aided Manufacturing Composites by Dietary Solvents: An Optical Three-dimensional Surface Analysis. Oper Dent 2020; 45:E176-E184. [PMID: 32101500 DOI: 10.2341/19-070-l] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/15/2019] [Indexed: 11/23/2022]
Abstract
CLINICAL RELEVANCE Computer-aided design/computer-aided manufacturing (CAD/CAM) composite resins are susceptible to degradation by dietary solvents. Dietary counselling is prudent when placing such CAD/CAM restorations. SUMMARY This study determined the effect of dietary solvents on the surface roughness (Ra) of direct, indirect, and computer-aided design/computer-aided manufacturing (CAD/CAM) dental composites. The materials evaluated were a direct composite (Filtek Z350 XT [FZ]), an indirect composite (Shofu Ceramage [CM]), and four CAD/CAM composites (Lava Ultimate [LU], Shofu Block HC [HC], Cerasmart [CS], and Vita Enamic [VE]). Specimens (12×14×1.5 mm) of each material were prepared, measured for baseline Ra, ranked, divided into six groups (n=12), and conditioned in the following media for 1 week at 37°C: air (control), distilled water, 0.02 N citric acid, 0.02 N lactic acid, heptane, and 50% ethanol-water solution. The composite specimens were then subjected to postconditioning Ra testing using an optical three-dimensional surface analyzer (G4e, Alicona Imaging GmbH, Raaba, Austria). Inter-medium and inter-material comparisons were performed with one-way analysis of variance and post hoc Bonferroni test at a significance level of α=0.05. Mean Ra values ranged from 0.086 ± 0.004 μm to 0.153 ± 0.005 μm for the various material/medium combinations. For all materials, conditioning in air (control) and distilled water generally resulted in significantly lower mean Ra than exposure to other dietary solvents. Conditioning in citric acid presented the roughest surfaces for FZ, CM, and CS. For LU, HC, and VE, exposure to lactic acid, heptane, and ethanol solution resulted in the highest mean Ra. Regardless of conditioning media, FZ had the highest and VE the lowest mean Ra compared with other composites. The CAD/CAM composites remained susceptible to surface degradation by dietary solvents despite their industrial polymerization.
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Blatz M, Chiche G, Bahat O, Roblee R, Coachman C, Heymann H. Evolution of Aesthetic Dentistry. J Dent Res 2019; 98:1294-1304. [DOI: 10.1177/0022034519875450] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
One of the main goals of dental treatment is to mimic teeth and design smiles in a most natural and aesthetic manner, based on the individual and specific needs of the patient. Possibilities to reach that goal have significantly improved over the last decade through new and specific treatment modalities, steadily enhanced and more aesthetic dental materials, and novel techniques and technologies. This article gives an overview of the evolution of aesthetic dentistry over the past 100 y from a historical point of view and highlights advances in the development of dental research and clinical interventions that have contributed the science and art of aesthetic dentistry. Among the most noteworthy advancements over the past decade are the establishment of universal aesthetic rules and guidelines based on the assessment of natural aesthetic parameters, anatomy, and physiognomy; the development of tooth whitening and advanced restorative as well as prosthetic materials and techniques, supported by the pioneering discovery of dental adhesion; the significant progress in orthodontics and periodontal as well as oral and maxillofacial surgery; and, most recently, the implementation of digital technologies in the 3-dimensional planning and realization of truly natural, individual, and aesthetic smiles. In the future, artificial intelligence and machine learning will likely lead to automation of aesthetic evaluation, smile design, and treatment-planning processes.
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Affiliation(s)
- M.B. Blatz
- Department of Preventive and Restorative Sciences, School of Dental Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - G. Chiche
- Department of Restorative Sciences, Dental College of Georgia, Augusta University, Augusta, GA, USA
| | - O. Bahat
- Private Practice, Beverly Hills, CA, USA
| | - R. Roblee
- Private Practice Limited to Orthodontics, Fayetteville, AR, USA
| | - C. Coachman
- Department of Preventive and Restorative Sciences, School of Dental Medicine, University of Pennsylvania, Philadelphia, PA, USA
- Private Practice, Sao Paulo, Brazil
| | - H.O. Heymann
- Division of Operative Dentistry, School of Dentistry, University of North Carolina, Chapel Hill, NC, USA
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Digital dentistry: The new state of the art - Is it disruptive or destructive? Dent Mater 2019; 36:9-24. [PMID: 31526522 DOI: 10.1016/j.dental.2019.08.103] [Citation(s) in RCA: 99] [Impact Index Per Article: 19.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2019] [Revised: 08/22/2019] [Accepted: 08/23/2019] [Indexed: 11/22/2022]
Abstract
OBJECTIVE Summarizing the new state of the art of digital dentistry, opens exploration of the type and extent of innovations and technological advances that have impacted - and improved - dentistry. The objective is to describe advances and innovations, the breadth of their impact, disruptions and advantages they produce, and opportunities created for material scientists. METHODS On-line data bases, web searches, and discussions with industry experts, clinicians, and dental researchers informed the content. Emphasis for inclusion was on most recent publications along with innovations presented at trade shows, in press releases, and discovered through discussions leading to web searches for new products. RESULTS Digital dentistry has caused disruption on many fronts, bringing new techniques, systems, and interactions that have improved dentistry. Innovation has spurred opportunities for material scientists' future research. SIGNIFICANCE With disruptions intrinsic in digital dentistry's new state of the art, patient experience has improved. More restoration options are available delivering longer lifetimes, and better esthetics. Fresh approaches are bringing greater efficiency and accuracy, capitalizing on the interest, capabilities, and skills of those involved. New ways for effective and efficient inter-professional and clinician-patient interactions have evolved. Data can be more efficiently mined for forensic and epidemiological uses. Students have fresh ways of learning. New, often unexpected, partnerships have formed bringing further disruption - and novel advantages. Yes, digital dentistry has been disruptive, but the abundance of positive outcomes argues strongly that it has not been destructive.
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Okamura K, Koizumi H, Kodaira A, Nogawa H, Yoneyama T. Surface properties and gloss of CAD/CAM composites after toothbrush abrasion testing. J Oral Sci 2019; 61:358-363. [PMID: 31217387 DOI: 10.2334/josnusd.18-0350] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Abstract
The purpose of this study was to evaluate the surface properties and gloss of CAD/CAM composites after toothbrush abrasion testing. Four CAD/CAM composites for molars (Cerasmart 300, Estelite P block, Katana Avencia P block, and KZR-CAD HR3 Gammatheta), one CAD/CAM composite for premolars (Shofu Block HC Hard), and one feldspathic ceramics (Vitablocs Mark II) were assessed. Knoop hardness number, gloss, and surface roughness (Ra, Rz, and Sa) were measured before and after toothbrush abrasion testing. Knoop hardness number values were in the order Vitablocs Mark II > Katana Avencia P block > Estelite P Block > Shofu Block HC Hard > Cerasmart 300 > KZR-CAD HR3 Gammatheta. After testing, the gloss of Estelite P block and KZR-CAD HR3 Gammatheta was greatly decreased and surface roughness was greatly increased. Periodic recall and re-polishing may thus be necessary when these products are used clinically.
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Affiliation(s)
- Kentaro Okamura
- Division of Applied Oral Sciences, Nihon University Graduate School of Dentistry
| | - Hiroyasu Koizumi
- Department of Dental Materials, Nihon University School of Dentistry.,Division of Biomaterials Science, Dental Research Center, Nihon University School of Dentistry
| | - Akihisa Kodaira
- Division of Applied Oral Sciences, Nihon University Graduate School of Dentistry
| | - Hiroshi Nogawa
- Department of Fixed Prosthodontics, Nihon University School of Dentistry.,Division of Advanced Dental Treatment, Dental Research Center, Nihon University School of Dentistry
| | - Takayuki Yoneyama
- Department of Dental Materials, Nihon University School of Dentistry.,Division of Biomaterials Science, Dental Research Center, Nihon University School of Dentistry
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Sotto Maior BS, Filgueiras A, Gonçalves Pinto D, Ferrarez LL, De Oliveira MF, Freitas TADC. Aplicabilidade clínica dos avanços da tecnologia CAD-CAM em Odontologia. HU REVISTA 2019. [DOI: 10.34019/1982-8047.2018.v44.13948] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
O avanço tecnológico tem se mostrado um grande aliado em diversas áreas, assim como na odontologia. O surgimento da tecnológica CAD/CAM (Computer Aided Design/Computer Aided Manufacturing) na década de 1950 trouxe outra realidade para a prática clínica diária. Previamente todo o processo laboratorial de trabalhos protéticos era demorado e puramente físico, atualmente a fabricação das peças protéticas demanda um menor tempo devido a utilização do meio digital, o que consequentemente diminui as consultas aos Cirurgiões-Dentistas. A adição de ferramentas digitais no planejamento e na execução dos tratamentos odontológicos alterou completamente o workflow, fazendo com que a busca para um aperfeiçoamento seja constante visando sempre o melhor atendimento e qualidade dos tratamentos realizados. Dessa forma este trabalho tem o objetivo de realizar uma revisão crítica da literatura sobre a aplicabilidade clínica da tecnologia CAD-CAM em Odontologia.
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Accuracy of 3-dimensional computer-aided manufactured single-tooth implant definitive casts. J Prosthet Dent 2018; 120:913-918. [DOI: 10.1016/j.prosdent.2018.02.011] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2017] [Revised: 02/04/2018] [Accepted: 02/05/2018] [Indexed: 11/18/2022]
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12
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Zhang J, Zhang R, Ren G, Zhang X. A method for using solid modeling CAD software to create an implant library for the fabrication of a custom abutment. J Prosthet Dent 2017; 117:209-213. [DOI: 10.1016/j.prosdent.2016.05.018] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2016] [Revised: 05/10/2016] [Accepted: 05/13/2016] [Indexed: 11/28/2022]
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Alajaji NK, Bardwell D, Finkelman M, Ali A. Micro-CT Evaluation of Ceramic Inlays: Comparison of the Marginal and Internal Fit of Five and Three Axis CAM Systems with a Heat Press Technique. J ESTHET RESTOR DENT 2016; 29:49-58. [PMID: 27680508 DOI: 10.1111/jerd.12271] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
OBJECTIVES To evaluate the marginal and internal adaptation of CAD/CAM lithium-disilicate inlay restorations fabricated by two milling systems (Five and Three-axis), and a traditional heat-press technique. METHODS Fifteen premolar teeth with an MOD cavity preparation were fabricated. Lithium-disilicate inlay restorations were obtained by three fabrication techniques and fitted to their dies (n = 15/gp) as follows: Group-1, three-axis milling system, Group-2, five-axis milling system, Group-3, conventional heat-press technique. Gaps were evaluated by X-ray microtomography. Marginal gap (MG), occlusal-marginal gap (OMG), proximal-marginal gap (PMG), gingival-marginal gap (GMG), absolute marginal discrepancy (AMD), axial-internal gap (AIG), and occlusal-internal gap (OIG) were evaluated at 120 different points per inlay. Data were analyzed using repeated measures ANOVA. Pairwise comparisons were conducted for post-hoc testes and the Bonferroni correction was used to adjust for multiple comparisons (α = 0.007). RESULTS The heat-press group demonstrated significantly smaller mean-values amongst all outcomes compared with CAD/CAM groups except for GMG, where there was no statistically significant difference between groups in the ANOVA (p = 0.042). Within the CAD/CAM groups, the five-axis group showed significantly lower OMG mean-value compared with the three-axis group p < 0.001, and lower AIG mean-value compared with the three-axis group p < 0.001. There was no significant difference between the five-axis and the three-axis groups' AMD, MG, PMG, and OIG locations. CONCLUSION Different fabrication techniques affected the marginal and internal adaptation of ceramic inlay restorations. The heat-press group showed the best marginal and internal adaptation results; however, in every group, all samples were within the clinically acceptable MG limit (100 μm). CLINICAL SIGNIFICANCE The marginal fit and internal adaptation of inlay ceramic restorations fabricated by a five-axis milling system have not been tested or compared with those fabricated by three-axis machines and the conventional heat-press method. The preferred method of inlay fabrication, whether in the lab or chair side, may be influenced by the results of this study and could affect future clinical decision-making. (J Esthet Restor Dent 29:49-58, 2017).
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Affiliation(s)
- Norah K Alajaji
- Clinical Specialist, Department of Restorative Dentistry, National Guard Hospital, Riyadh, Saudi Arabia
| | - David Bardwell
- Clinical Professor, Prosthodontics and Operative Dentistry, Tufts University School of Dental Medicine, Boston, MA, USA
| | - Matthew Finkelman
- Associate Professor, Department of Public Health and Community Service, Tufts University School of Dental Medicine, Boston, MA, USA
| | - Ala Ali
- Assistant Professor, Department of Prosthodontics Tufts University School of Dental Medicine, OneKneeland Street, Office 224, Boston, MA, 0211, USA
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Koch GK, Gallucci GO, Lee SJ. Accuracy in the digital workflow: From data acquisition to the digitally milled cast. J Prosthet Dent 2016; 115:749-54. [PMID: 26803173 DOI: 10.1016/j.prosdent.2015.12.004] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2015] [Revised: 12/03/2015] [Accepted: 12/05/2015] [Indexed: 10/22/2022]
Abstract
STATEMENT OF PROBLEM The accuracy of digital impressions and the milling of implant crowns greatly influence the clinical outcome of implant restorations. PURPOSE The purpose of this in vitro study was to calculate the propagation of error in the process of milling an implant crown. MATERIAL AND METHODS Thirty digitally milled casts made directly from a reference model were prepared. The casts were scanned with a laboratory scanner, and 30 standard tesselation language (STL) datasets from each group were imported to inspection software. In each analysis, STL datasets were aligned by a repeated best fit algorithm, and 18 specified contact locations of interest were measured in mean volumetric deviations. The master reference dataset was aligned 30 times to the master reference dataset to determine the software variation. The reference datasets were aligned to the master reference dataset to determine the scanner variation. The milled cast datasets were aligned to the master reference dataset to determine the milling variation. The 18 specified contact locations of interest were pooled by cusps, occlusal ridge/fossae, interproximal contacts, facial/lingual aspect, and implant position. The pooled areas were statistically analyzed by comparing each group with the reference model to investigate the mean volumetric deviations accounting for accuracy and standard deviations for precision. RESULTS Software and scanner variation were negligible. Variations in the milled models resulting from software and scanner error exhibited statistical significance (P<.001). Software, scanner, and milling error were shown to propagate through the digital workflow to the milled model. CONCLUSIONS The pooled locations may describe the reliability of the milling process as it applies to specific anatomic locations on the tooth.
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Affiliation(s)
- George K Koch
- Graduate student, Harvard School of Dental Medicine, Boston, Mass
| | - German O Gallucci
- Associate Professor and Chair, Department of Restorative Dentistry and Biomaterials Science, Harvard School of Dental Medicine, Boston, Mass
| | - Sang J Lee
- Instructor, Department of Restorative Dentistry and Biomaterials Science, Harvard School of Dental Medicine, Boston, Mass.
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15
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Yau HT, Yang TJ, Lin YK. Comparison of 3-D Printing and 5-axis Milling for the Production of Dental e-models from Intra-oral Scanning. ACTA ACUST UNITED AC 2015. [DOI: 10.1080/16864360.2015.1059186] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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16
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Karaman T, Ulku SZ, Zengingul AI, Guven S, Eratilla V, Sumer E. Evaluation and comparison of the marginal adaptation of two different substructure materials. J Adv Prosthodont 2015; 7:257-63. [PMID: 26140178 PMCID: PMC4486622 DOI: 10.4047/jap.2015.7.3.257] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2015] [Revised: 03/16/2015] [Accepted: 04/07/2015] [Indexed: 11/25/2022] Open
Abstract
PURPOSE In this study, we aimed to evaluate the amount of marginal gap with two different substructure materials using identical margin preparations. MATERIALS AND METHODS Twenty stainless steel models with a chamfer were prepared with a CNC device. Marginal gap measurements of the galvano copings on these stainless steel models and Co-Cr copings obtained by a laser-sintering method were made with a stereomicroscope device before and after the cementation process and surface properties were evaluated by scanning electron microscopy (SEM). A dependent t-test was used to compare the mean of the two groups for normally distributed data, and two-way variance analysis was used for more than two data sets. Pearson's correlation analysis was also performed to assess relationships between variables. RESULTS According to the results obtained, the marginal gap in the galvano copings before cementation was measured as, on average, 24.47 ± 5.82 µm before and 35.11 ± 6.52 µm after cementation; in the laser-sintered Co-Cr structure, it was, on average, 60.45 ± 8.87 µm before and 69.33 ± 9.03 µm after cementation. A highly significant difference (P<.001) was found in marginal gap measurements of galvano copings and a significant difference (P<.05) was found in marginal gap measurements of the laser-sintered Co-Cr copings. According to the SEM examination, surface properties of laser sintered Co-Cr copings showed rougher structure than galvano copings. The galvano copings showed a very smooth surface. CONCLUSION Marginal gaps values of both groups before and after cementation were within the clinically acceptable level. The smallest marginal gaps occurred with the use of galvano copings.
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Affiliation(s)
- Tahir Karaman
- Department of Prosthodontics, Faculty of Dentistry, Firat University, Elazig, Turkey
| | - Sabiha Zelal Ulku
- Department of Prosthodontics, Faculty of Dentistry, Dicle University, Diyarbakir, Turkey
| | - Ali Ihsan Zengingul
- Department of Prosthodontics, Faculty of Dentistry, Dicle University, Diyarbakir, Turkey
| | - Sedat Guven
- Department of Prosthodontics, Faculty of Dentistry, Dicle University, Diyarbakir, Turkey
| | - Veysel Eratilla
- Diyarbakir Oral and Dental Health Center, Diyarbakir, Turkey
| | - Ebru Sumer
- Diyarbakir Oral and Dental Health Center, Diyarbakir, Turkey
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17
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Trends in computer-aided manufacturing in prosthodontics: a review of the available streams. Int J Dent 2014; 2014:783948. [PMID: 24817888 PMCID: PMC4000974 DOI: 10.1155/2014/783948] [Citation(s) in RCA: 162] [Impact Index Per Article: 16.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2013] [Accepted: 03/10/2014] [Indexed: 11/18/2022] Open
Abstract
In prosthodontics, conventional methods of fabrication of oral and facial prostheses have been considered the gold standard for many years. The development of computer-aided manufacturing and the medical application of this industrial technology have provided an alternative way of fabricating oral and facial prostheses. This narrative review aims to evaluate the different streams of computer-aided manufacturing in prosthodontics. To date, there are two streams: the subtractive and the additive approaches. The differences reside in the processing protocols, materials used, and their respective accuracy. In general, there is a tendency for the subtractive method to provide more homogeneous objects with acceptable accuracy that may be more suitable for the production of intraoral prostheses where high occlusal forces are anticipated. Additive manufacturing methods have the ability to produce large workpieces with significant surface variation and competitive accuracy. Such advantages make them ideal for the fabrication of facial prostheses.
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18
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He M, Wang D, Jiang Y. Overview of Ultrasound Biomicroscopy. J Curr Glaucoma Pract 2012; 6:25-53. [PMID: 27990069 PMCID: PMC5159457 DOI: 10.5005/jp-journals-10008-1105] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2011] [Accepted: 11/09/2011] [Indexed: 11/23/2022] Open
Abstract
Ultrasound biomicroscopy (UBM) is a high-resolution ultrasound technique that allows noninvasive in vivo imaging of structural details of the anterior ocular segment at near light microscopic resolution and provides detailed assessment of anterior segment structures, including those obscured by normal anatomic and pathologic relations. This review gives an overview regarding the instrument, technique and its applications.
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Affiliation(s)
- Mingguang He
- Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, China
| | - Dandan Wang
- Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, China
| | - Yuzheng Jiang
- Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, China
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19
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Abstract
Until recently, corneal biomechanical properties could not be measured in vivo. The ocular response analyzer is a new, noninvasive device that analyses corneal biomechanical properties simply and rapidly. The ORA allows cornea compensated IOP measurements and can estimate corneal hysteresis (CH) and corneal resistance factor (CRF). It is designed to improve the accuracy of IOP measurement by using corneal biomechanical data to calculate a biomechanically adjusted estimate of intraocular pressure. This review critically evaluates the technology and its implications in current day glaucoma management.
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Affiliation(s)
- Sushmita Kaushik
- Advanced Eye Centre, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - Surinder Singh Pandav
- Advanced Eye Centre, Postgraduate Institute of Medical Education and Research, Chandigarh, India
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20
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Khurana AK, Khurana B, Khurana AK. Drug-induced Angle-Closure Glaucoma. J Curr Glaucoma Pract 2012; 6:6-8. [PMID: 27990064 PMCID: PMC5159452 DOI: 10.5005/jp-journals-10008-1100] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2011] [Accepted: 11/02/2011] [Indexed: 11/23/2022] Open
Abstract
Drug-induced angle-closure glaucoma is an important entity for the ophthalmologist as well as the general physician as it represents a preventable cause of potential blindness. This brief review highlights the fact that a high index of suspicion, in a susceptible individual followed by confirmation on appropriate imaging modality (UBM, ultrasound or anterior segment OCT) can alleviate the threat to sight and also help to institute appropriate therapy.
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Affiliation(s)
- Aruj K Khurana
- Senior Professor, Post Graduate Institute of Medical Sciences, Rohtak, Haryana, India
| | - Bhawna Khurana
- Post Graduate Institute of Medical Sciences, Rohtak, Haryana, India
| | - Ashok K Khurana
- Post Graduate Institute of Medical Sciences, Rohtak, Haryana, India
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21
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Kaur D, Gupta A, Singh G. Perspectives on Quality of Life in Glaucoma. J Curr Glaucoma Pract 2012; 6:9-12. [PMID: 27990065 PMCID: PMC5159453 DOI: 10.5005/jp-journals-10008-1101] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2011] [Accepted: 10/28/2011] [Indexed: 11/23/2022] Open
Abstract
Chronic diseases are invariably associated with decreased functioning ability of the individual in one form or the other depending upon the system/organ involved. Disability consequent to the disease is the major factor affecting the patient's physical and psychosocial well-being; in other words, the 'Quality of Life (QOL)'. Besides the disease itself, the treatment and its consequences are also major determinants of QOL of the patients. Globally, glaucoma, which is emerging as one of the leading causes of blindness, is one such chronic ophthalmic disease characterized by a progressive loss of visual function and a potential to cause irreversible blindness, if not treated at an early stage. Patients of glaucoma need to take lifelong medications in order to keep their intraocular pressure within limits. It's impact on the daily life of patients cannot be overexpressed and compounded by the fact that it remains asymptomatic for a considerable time after the disease has set in; has led to new imperatives in diagnosis, treatment and epidemiological and outcome studies. Assessment of the debilitating effect of glaucoma and side effects of its treatment on the emotional and physical QOL of the patient is therefore an important criterion for arriving at the treatment regimen. An extensive literature search was done on Pubmed Central, Pubmed and Google Scholar using the keywords 'glaucoma', 'quality of life in glaucoma', 'management in POAG' and 'QOL assessment tools'. Various tools available for the assessment of QOL, and their advantages and limitations have been reviewed in this article.
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Affiliation(s)
- Divjyot Kaur
- Junior Resident, Department of Pharmacology, Government Medical College, Patiala, Punjab, India
| | - Anita Gupta
- Professor and Head, Department of Pharmacology, Government Medical College, Patiala, Punjab, India
| | - Gursatinder Singh
- Associate Professor, Department of Pharmacology, Government Medical College, Patiala, Punjab, India
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22
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Abstract
A large number of glaucoma patients suffer from vision impairments that qualify as low vision. Additional difficulties associated with low vision include problems with glare, lighting, and contrast, which can make daily activities extremely challenging. This article elaborates on how low vision aids can help with various tasks that visually impaired glaucoma patients need to do each day, to take care of themselves and to lead an independent life.
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Affiliation(s)
- Anjani Khanna
- Glaucoma Services, Government Medical College and Hospital, Chandigarh, India
| | - Parul Ichhpujani
- Glaucoma Services, Government Medical College and Hospital, Chandigarh, India
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23
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Sathyan P, Shilpa S, Anitha A. Optical Coherence Tomography in Glaucoma. J Curr Glaucoma Pract 2012; 6:1-5. [PMID: 27990063 PMCID: PMC5159451 DOI: 10.5005/jp-journals-10008-1099] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2011] [Accepted: 10/20/2011] [Indexed: 11/30/2022] Open
Abstract
The optic disk and the RNFL are the principal sites of apparent glaucomatous damage which precedes glaucomatous visual field alterations. RNFL defects are known to precede detection of visual field defects by approximately 6 years. Accurate early detection and monitoring of ONH and RNFL defects has become the prime focus of effective management of glaucoma. Optical coherence tomography employs low-coherence interferometry to obtain cross-sectional images of the ocular tissues. This review attempts to critically analyse the applications of both, anterior and posterior segment OCT in glaucoma management.
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Affiliation(s)
- P Sathyan
- Glaucoma Services, Aravind Eye Hospital, Coimbatore, Tamil Nadu, India
| | - Shilpa Shilpa
- Glaucoma Services, Aravind Eye Hospital, Coimbatore, Tamil Nadu, India
| | - Anitha Anitha
- Glaucoma Services, Aravind Eye Hospital, Coimbatore, Tamil Nadu, India
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24
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Angmo D, Sobti A, Panda A. The Surgical Treatment of Neovascular Glaucoma with Ex-PRESS P-50 Miniature Glaucoma Shunt. J Curr Glaucoma Pract 2012; 6:13-16. [PMID: 27990066 PMCID: PMC5159454 DOI: 10.5005/jp-journals-10008-1102] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2011] [Accepted: 10/18/2011] [Indexed: 11/27/2022] Open
Abstract
Surgical treatment for neovascular glaucoma has evolved from cyclodestructive procedures to full-thickness filtration surgery, to trabeculectomy with antifibrosis drugs and glaucoma drainage implant surgery. The choice of a surgical approach may be influenced by several factors, including the stage of the disease. Many surgeons favor drainage implants when the disease is more advanced or when severe inflammation is present, which would be associated with a poorer prognosis if trabeculectomy were chosen. New devices are being developed to allow surgeons increased control with more predictable postoperative results. One such device, the Ex-PRESS™ mini glaucoma shunt, has undergone changes in design and method of insertion making it more appealing for use in patients requiring IOP-lowering surgery. This report highlights the use of Ex-PRESS mini glaucoma shunt in neovascular glaucoma, surgical technique and summarize pertinent literature on the role of this device in glaucoma surgery.
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Affiliation(s)
- Dewang Angmo
- Department of Glaucoma Services, Dr RP Centre for Ophthalmic Sciences, All India Institute of Medical Sciences, New Delhi, India
| | - Amit Sobti
- Department of Glaucoma Services, Dr RP Centre for Ophthalmic Sciences, All India Institute of Medical Sciences, New Delhi, India
| | - Anita Panda
- Department of Glaucoma Services, Dr RP Centre for Ophthalmic Sciences, All India Institute of Medical Sciences, New Delhi, India
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25
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Abstract
Computer-aided design (CAD) and computer-aided manufacturing (CAM) have become an increasingly popular part of dentistry over the past 25 years. The technology, which is used in both the dental laboratory and the dental office, can be applied to inlays, onlays, veneers, crowns, fixed partial dentures, implant abutments, and even full-mouth reconstruction. This article discusses the history of CAD/CAM in dentistry and gives an overview of how it works. It also provides information on the advantages and disadvantages, describes the main products available, discusses how to incorporate the new technology into your practice, and addresses future applications.
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Affiliation(s)
- Gary Davidowitz
- International Advanced Aesthetic Dentistry Program, NYU College of Dentistry, 345 East 24th Street, New York, NY 10010, USA.
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26
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Souza ROA, Özcan M, Pavanelli CA, Buso L, Lombardo GHL, Michida SMA, Mesquita AMM, Bottino MA. Marginal and Internal Discrepancies Related to Margin Design of Ceramic Crowns Fabricated by a CAD/CAM System. J Prosthodont 2011; 21:94-100. [DOI: 10.1111/j.1532-849x.2011.00793.x] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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Miyazaki T, Hotta Y. CAD/CAM systems available for the fabrication of crown and bridge restorations. Aust Dent J 2011; 56 Suppl 1:97-106. [DOI: 10.1111/j.1834-7819.2010.01300.x] [Citation(s) in RCA: 164] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Martínez-Rus F, Suárez MJ, Rivera B, Pradíes G. Evaluation of the absolute marginal discrepancy of zirconia-based ceramic copings. J Prosthet Dent 2011; 105:108-14. [DOI: 10.1016/s0022-3913(11)60009-7] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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29
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Hjalmarsson L, Örtorp A, Smedberg JI, Jemt T. Precision of Fit to Implants: A Comparison of Cresco™ and Procera® Implant Bridge Frameworks. Clin Implant Dent Relat Res 2010; 12:271-80. [DOI: 10.1111/j.1708-8208.2009.00171.x] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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30
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Boeckler AF, Lee H, Psoch A, Setz JM. Prospective Observation of CAD/CAM Titanium-Ceramic-Fixed Partial Dentures: 3-Year Follow-Up. J Prosthodont 2010; 19:592-7. [PMID: 20723013 DOI: 10.1111/j.1532-849x.2010.00638.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Affiliation(s)
- Arne F Boeckler
- Department of Prosthodontics, Martin-Luther-University Halle-Wittenberg, Center for Dentistry and Oral Medicine, Halle, Germany.
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31
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Stober T, Johnson GH, Schmitter M. Accuracy of the newly formulated vinyl siloxanether elastomeric impression material. J Prosthet Dent 2010; 103:228-39. [PMID: 20362766 DOI: 10.1016/s0022-3913(10)60035-2] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
STATEMENT OF PROBLEM A newly formulated vinyl siloxanether elastomeric impression material is available, but there is little knowledge of its accuracy in relation to existing materials. PURPOSE The purpose of this in vitro study was to assess the accuracy of disinfected vinyl siloxanether impressions and compare the accuracy to a common vinyl polysiloxane and a polyether impression system. MATERIAL AND METHODS Impressions were made from a modified dentoform master model containing a simulated crown preparation. Dimensional changes (mm) between the master model and working casts (type IV gypsum) were assessed. The following were evaluated: vinyl polysiloxane in a 1-step, dual-viscosity technique (VPS Dual), polyether as monophase material (PE Mono), and vinyl siloxanether in a 1-step, dual-viscosity (VSE Dual), and monophase technique (VSE Mono). Measurements of the master model and working casts, including anteroposterior (AP) and cross-arch (XA) dimensions, were made with a measuring microscope. The simulated crown preparation was measured in mesiodistal (MDG, MDO), buccolingual (BLG, BLO), and occlusogingival dimensions (OGL, OGB). Disinfection involved immersion for 10 minutes in potassium peroxomonosulfate, sodium benzoate, tartaric acid solution, or no disinfection (control) (n=8). A multivariate GLM statistical approach (MANOVA) was used to analyze the data (alpha=.05). Pearson's correlation test was used for related dimensions. RESULTS The AP and XA dimensions of working casts were larger than the master for the disinfected condition and control. Whether disinfected or not, the working dies were shorter in height (OGB, OGL), larger in the buccolingual dimension (BLO, BLG), somewhat larger in the MDO dimension, and somewhat smaller in the MDG dimension compared to the prepared tooth of the master model, resulting in an irregular or oval profile. There were significant differences among the impression systems for each dimension except AP. Differences between the disinfected and nondisinfected conditions were significant (P=.03) with respect to dimensions of the gypsum working cast, but not for dimensions of the working die (P=.97). In general, differences relative to the master were small and of minor clinical significance considering marginal gaps of crowns smaller than 150-100 mum are considered clinically acceptable. CONCLUSIONS VSE monophase impressions and VSE dual-viscosity impressions demonstrated acceptable accuracy for clinical use with immersion disinfection, since the results for VSE were comparable to the results for PE and VPS materials, and the differences as compared to the master model were small.
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Affiliation(s)
- Thomas Stober
- University Hospital Heidelberg, 69120 Heidelberg, Germany.
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32
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Boeckler AF, Lee H, Stadler A, Setz JM. Prospective observation of CAD/CAM titanium ceramic single crowns: A three-year follow up. J Prosthet Dent 2009; 102:290-7. [DOI: 10.1016/s0022-3913(09)60176-1] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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33
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Miyazaki T, Hotta Y, Kunii J, Kuriyama S, Tamaki Y. A review of dental CAD/CAM: current status and future perspectives from 20 years of experience. Dent Mater J 2009; 28:44-56. [PMID: 19280967 DOI: 10.4012/dmj.28.44] [Citation(s) in RCA: 422] [Impact Index Per Article: 28.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
In this article, we review the recent history of the development of dental CAD/CAM systems for the fabrication of crowns and fixed partial dentures (FPDs), based on our 20 years of experience in this field. The current status of commercial dental CAD/CAM systems developed around the world is evaluated, with particular focus on the field of ceramic crowns and FPDs. Finally, we discuss the future perspectives applicable to dental CAD/CAM. The use of dental CAD/CAM systems is promising not only in the field of crowns and FPDs but also in other fields of dentistry, even if the contribution is presently limited. CAD/CAM technology will contribute to patients' health and QOL in the aging society.
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Affiliation(s)
- Takashi Miyazaki
- Showa University School of Dentistry, 1-5-8 Hantanodai, Shinagawa-ku, Tokyo 142-8555, Japan.
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34
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Att W, Komine F, Gerds T, Strub JR. Marginal adaptation of three different zirconium dioxide three-unit fixed dental prostheses. J Prosthet Dent 2009; 101:239-47. [PMID: 19328277 DOI: 10.1016/s0022-3913(09)60047-0] [Citation(s) in RCA: 78] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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35
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The anterior all-ceramic crown: a rationale for the choice of ceramic and cement. Br Dent J 2008; 205:251-5. [PMID: 18791580 DOI: 10.1038/sj.bdj.2008.735] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/11/2007] [Indexed: 11/09/2022]
Abstract
The full coverage, all-ceramic restoration of an anterior tooth is a challenging clinical situation for which a variety of all-ceramic systems and cements are available. The decision making process involves the consideration of a number of factors such as underlying substrate colour, tooth preparation geometry, margin location and cementation system. This article discusses the rationale behind these factors and presents a logical and scientific based sequence for the decision making process. A clinical case is presented to demonstrate the requirements and materials necessary for the optimal resin bonded anterior crown.
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36
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Torsello F, di Torresanto VM, Ercoli C, Cordaro L. Evaluation of the marginal precision of one-piece complete arch titanium frameworks fabricated using five different methods for implant-supported restorations. Clin Oral Implants Res 2008; 19:772-9. [DOI: 10.1111/j.1600-0501.2008.01555.x] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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37
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Chang PP, Henegbarth EA, Lang LA. Maxillary zirconia implant fixed partial dentures opposing an acrylic resin implant fixed complete denture: A two-year clinical report. J Prosthet Dent 2007; 97:321-30. [PMID: 17618914 DOI: 10.1016/s0022-3913(07)60020-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
The fabrication of fixed implant-supported prostheses for edentulous patients may be performed using all-ceramic or acrylic resin materials. This clinical report describes the fabrication and 2-year follow-up of maxillary zirconia implant fixed partial dentures opposing a mandibular acrylic resin screw-retained fixed complete denture.
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Affiliation(s)
- Paul P Chang
- Department Prosthodontics, University of Texas Health Science Center San Antonio, Dental School, San Antonio, Tex. 78229-3900, USA
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38
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Vigolo P, Givani A, Majzoub Z, Cordioli G. A 4-Year Prospective Study to Assess Peri-Implant Hard and Soft Tissues Adjacent to Titanium Versus Gold-Alloy Abutments in Cemented Single Implant Crowns. J Prosthodont 2006; 15:250-6. [PMID: 16827738 DOI: 10.1111/j.1532-849x.2006.00114.x] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
PURPOSE The purpose of this prospective clinical study was to compare titanium and gold-alloy abutments when used with cemented, implant-supported single-tooth crowns. For 4 years following prosthodontic rehabilitation, these abutments were evaluated with respect to peri-implant marginal bone levels and peri-implant soft tissue parameters. MATERIALS AND METHODS During the years 1998 to 2000, 20 patients were selected from a patient population receiving treatment in the Implantology Department at the University of Padova, Italy. They all presented with single-tooth bilateral edentulous sites in the premolar/molar region with adequate bone width, similar bone height on each side, and an occlusal scheme that allowed for the establishment of identical occlusal cusp/fossa contacts on each side. Each subject received two identical implants (one in each edentulous site). One was randomly selected to be restored with a titanium abutment and a cemented implant-supported single-tooth crown, and the other was restored with a gold-alloy abutment and a cemented implant-supported single tooth crown. Data on peri-implant marginal bone levels and soft tissue parameters were collected for 4 years after abutment and crown insertion placement and analyzed to determine whether there was a significant (p< .001) difference with respect to the type of abutments (titanium vs. gold alloy) used. RESULTS All subjects completed the study. All 40 implants survived, resulting in a cumulative implant success rate of 100%. Statistical analysis revealed no significant differences between the two groups with respect to peri-implant marginal bone levels and soft tissue parameters. CONCLUSIONS Within the limitations of this study, the results indicate that there was no evidence of different response with the peri-implant marginal bone and soft tissue when titanium or gold-alloy abutments were used in conjunction with the cemented, single-tooth implant restorations provided for this limited patient population. There was no evidence of different behavior of peri-implant marginal bone and of peri-implant soft tissue when titanium abutments or gold-alloy abutments were used for cemented single-tooth implant restorations in this limited patient population.
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Affiliation(s)
- Paolo Vigolo
- Department of Clinical Odontostomatology, Institute of Clinical Dentistry, University of Padova, Padova, Italy.
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Grossmann Y, Pasciuta M, Finger IM. A novel technique using a coded healing abutment for the fabrication of a CAD/CAM titanium abutment for an implant-supported restoration. J Prosthet Dent 2006; 95:258-61. [PMID: 16543025 DOI: 10.1016/j.prosdent.2005.12.013] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
This article describes the use of CAD/CAM titanium abutments for restoring dental implants. This new system incorporates both advantages of modern technology and a simplified impression technique with a coded healing abutment.
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Affiliation(s)
- Yoav Grossmann
- Department of Prosthodontics, School of Dentistry, Louisiana State University Health Sciences Center, Maxillofacial Prosthetics Service, Medical Center of Louisiana, USA
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Hjalmarsson L, Smedberg JI. A 3-Year Retrospective Study of Cresco Frameworks: Preload and Complications. Clin Implant Dent Relat Res 2005; 7:189-99. [PMID: 16336910 DOI: 10.1111/j.1708-8208.2005.tb00064.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
PURPOSE The aim of this retrospective clinical study was to evaluate the clinical outcome of fixed implant-supported complete prostheses on Astra or Brånemark implants when using either conventional cast frameworks or frameworks produced according to the Cresco Ti Precision method (Cresco Ti Systems Sàrl., Lausanne, Switzerland). MATERIALS AND METHODS Forty-six patients treated 3 years previously were divided into four groups according to implant system and framework design. Clinical examinations were performed and case records were scrutinized. The stability for each prosthesis retention screw was recorded as the torque profile and was monitored using the Osseocare torque controller (Nobel Biocare AB, Göteborg, Sweden). Complications in association with implants and superstructures were registered. Patient opinions were recorded. The significance level was set to 5%. RESULTS The Astra-Cresco group demonstrated a lower degree of prosthesis retention screw stability compared with the Astra group. No differences among the four groups were seen regarding plaque, bleeding on probing, or marginal bone resorption. The Brånemark group (Brånemark System, Nobel Biocare AB) demonstrated more mechanical complications than the Brånemark-Cresco group. Mobile prostheses were found in the Brånemark and the Astra-Cresco groups. Fracture of veneer was seen in 20% of the prostheses and was more frequently found in the groups with mobile prostheses. Sixty percent of the prostheses showed reactions in the surrounding soft tissues. The most common reaction was mucosal proliferation. No differences were detected in the patients' opinions. CONCLUSION Within the limitations of this retrospective study, the following can be concluded: (1) compared with conventional frameworks, the Cresco distortion correction method does not provide a better clinical outcome after prosthesis connection in patients with fixed implant-supported complete prostheses; and (2) the two framework-producing methods behave differently on Astra implants compared with Brånemark implants concerning prosthesis retention screw stability, mechanical and biologic complications, and reactions in patients with fixed implant-supported complete prostheses.
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Affiliation(s)
- Lars Hjalmarsson
- Department of Prosthetic Dentistry, Public Dental Health, St Erik Hospital, Stockholm, Sweden.
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Naert I, Van der Donck A, Beckers L. Precision of fit and clinical evaluation of all-ceramic full restorations followed between 0.5 and 5 years. J Oral Rehabil 2005; 32:51-7. [PMID: 15634302 DOI: 10.1111/j.1365-2842.2004.01374.x] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Currently CAD-CAM systems are rapidly gaining importance in dental practice as some of their products aim to combine aesthetics with strength and are free of metals. This study reports on the crown adaptation, marginal fit and clinical behaviour of 300 all-ceramic full coverage restorations (Procera, Gothenburg, Sweden) placed in one clinical centre and followed up to 5 years. The marginal fit and coping adaptation before and after luting was determined by direct measurement as well as after sectioning in a laboratory study. Three hundred all-ceram restorations were installed in 165 patients between 1994 and 1998. Before the end of 2000, patients were recalled to assess their restorations, using the California Dental Association quality evaluation index, their own appreciation, as well as the reaction towards the periodontium. The in vitro data revealed a mean marginal adaptation of 30 microm, before and after luting of the Al(2)0(3)-coping onto the tooth. However, at the deepest part of the chamfer, the distance increased to 135 microm. In the clinical study only one restoration fractured, while in 6% small porcelain infractions occurred. After polishing the latter, no persistent patient complaints remained. At the last recall visit 1.8% of the margins were rated unacceptable. Dentists rated 72 and 78% of the restorations excellent for surface, colour and anatomic form respectively. Eighty-seven per cent of the patients rated their restorations more than 7/10 on an ordered analogue scale for aesthetics as well as for function.
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Affiliation(s)
- I Naert
- Department of Prosthetic Dentistry, School of Dentistry, Oral Pathology and Maxillofacial Surgery, University Hospitals, Catholic University Leuven, B-3000 Leuven, Belgium.
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Takahashi T, Gunne J. Fit of implant frameworks: an in vitro comparison between two fabrication techniques. J Prosthet Dent 2003; 89:256-60. [PMID: 12644800 DOI: 10.1067/mpr.2003.40] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
STATEMENT OF PROBLEM It has been suggested that a precise fit between the implant and the framework cylinder is necessary to ensure a satisfactory long-term clinical outcome. PURPOSE The purpose of this study was to compare the precision of fit between implant abutments and framework cylinders in frameworks fabricated by the Procera system and those fabricated from cast gold-alloy. MATERIAL AND METHODS A total of 19 frameworks, 14 made with the Procera system (type 1) and 5 made of a cast gold-alloy (type 2), were fabricated. A total of 95 implants, 70 type 1 and 25 type 2 frameworks, were evaluated. Three replicas of the space between the implant abutments and the framework cylinders of the master cast were made for each test specimen. The replicas were cut with a scalpel in 2 axial directions: buccal-lingual and right-left. For the purpose of measurement, a microscope with a precision of +/- 0.5 microm was used at original magnification x30. The Student t test was used to determine whether there were significant differences between the framework designs. RESULTS The buccal-lingual measurements for the type 1 and type 2 frameworks showed mean values of 28.1 microm (SD 9.8) and 42.0 microm (SD 1.8) on the buccal side, respectively, and 25.6 microm (SD 11.2) and 51.6 microm (SD 10.9) on the lingual side, respectively. For the right-left view, the mean measurements were 26.6 microm (SD 8.4) and 49.2 microm (SD 11.4) on the right side, respectively, and 27.4 microm (SD 8.5) and 44.4 microm (SD 6.5) on the left side, respectively. The total mean value for type 1 frameworks was 26.9 microm (SD 9.3); that for type 2 frameworks was 46.8 microm (SD 8.8). CONCLUSION Within the limitations of this experiment, it was demonstrated that the fit of frameworks made with the Procera system was significantly better than that of the frameworks made with cast gold-alloy (P<.01).
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Affiliation(s)
- Toshiyuki Takahashi
- Tokyo Dental College, Department of Crown and Bridge Prosthodontics, Chiba, Japan.
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Denissen H, Dozić A, van der Zel J, van Waas M. Marginal fit and short-term clinical performance of porcelain-veneered CICERO, CEREC, and Procera onlays. J Prosthet Dent 2000; 84:506-13. [PMID: 11105006 DOI: 10.1067/mpr.2000.110258] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
STATEMENT OF PROBLEM Onlay preparations are very complex surfaces for computer surface digitization, CAD, and CAM of all-ceramic onlay cores. PURPOSE This study tested the hypothesis that onlays can be fabricated with CICERO, CEREC, and Procera core technologies. MATERIAL AND METHODS Fifteen mandibular and 10 maxillary molars were prepared for onlays in 17 patients (11 women and 6 men). The onlay design was experimental. Molars were prepared with deep gingival chamfers in the proximal boxes and around the functional cusps. The nonfunctional cusps were prepared with broad bevels. Eight stone dies of preparations were measured with a laser beam (CICERO), 10 dies with a light beam (CEREC), and 7 dies with a contact probe (Procera). Two onlay cores were produced for the same stone die. One core was used to analyze fit on the stone die, and the other core was porcelain veneered for optimizing anatomy, esthetics, and fit of the onlay and cemented. The fit of the onlay core on the stone die and the cement width on a stone cast were measured by a microscopic digital imaging system. The onlays were evaluated for function every 6 months for 2 years. RESULTS Measurements of the margins by the CICERO system were (1) precise (error <4%) and (2) accurate with an SD of less than 9 microm. The proposed onlay preparation design met the requirement that all points of the surface be visible from a single point of view for optical 3-dimensional mapping by the CEREC system. For the surface measurements by the Procera contact probe, the orientation of the sapphire tip toward the preparation surface was critical, and it was necessary to apply wax to smooth internal edges. The marginal gaps of the CICERO, CEREC, and Procera cores on the stone dies were 74 microm (SD 15), 85 microm (SD 40), and 68 microm (SD 53), respectively. The cement width was 81 microm (SD 64). No fractures occurred. CONCLUSION Marginal gaps for the onlay cores were no more than 85 microm. The cement width of the semicomputer-produced onlays of 81 microm was a favorable measurement value for a clinically acceptable, strong all-ceramic onlay. However, this value as well as anatomy and esthetics of the onlay depended on the craftsmanship of the porcelain veneering by the dental technician.
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Affiliation(s)
- H Denissen
- Department of Oral Function and Prosthetic Dentistry, Academic Centre for Dentistry Amsterdam (ACTA), Amsterdam, The Netherlands.
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Lövgren R, Andersson B, Carlsson GE, Odman P. Prospective clinical 5-year study of ceramic-veneered titanium restorations with the Procera system. J Prosthet Dent 2000; 84:514-21. [PMID: 11105007 DOI: 10.1067/mpr.2000.110137] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
STATEMENT OF PROBLEM The biocompatibility of titanium has been well documented, but clinical outcomes of ceramic-veneered titanium restorations were not conclusive. PURPOSE The study presents the results of a 5-year clinical study of individual crowns and fixed partial dentures (FPDs) veneered with a low-fusing ceramic of the Procera system. MATERIAL AND METHODS All patients at one clinic who required crowns or FPDs during a 2-year period were invited to participate. A total of 260 patients received 333 ceramic-veneered Procera restorations (242 single crowns and 91 FPDs). Clinical registrations were performed annually, and the restorations were evaluated according to the California Dental Association rating system. At the 5-year follow-up, 198 (76%) patients were examined. Most of the loss of patients could be explained. RESULTS Practically all Procera restorations were judged as satisfactory both at baseline and follow-up examinations. One artificial crown and 1 FPD were remade because of extensive fractures of ceramic veneers. Two FPDs had fractures of a soldered joint, but only 1 FPD was replaced. Some minor complications occurred, such as small porcelain fractures that could be polished (6% of single crowns, 13% of FPDs) and or loosened restorations that were recemented. Other recorded complications were not related to the Procera system but to dental caries, loosened posts and cores, and root fractures. CONCLUSION Clinical outcomes over a 5-year period for ceramic-veneered titanium restorations with the Procera system were favorable.
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Affiliation(s)
- R Lövgren
- The Public Dental Service Clinic, Kungshamn, Sweden.
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Helldén LB, Dérand T, Johansson S, Lindberg A. The CrescoTi Precision method: description of a simplified method to fabricate titanium superstructures with passive fit to osseointegrated implants. J Prosthet Dent 1999; 82:487-91. [PMID: 10512972 DOI: 10.1016/s0022-3913(99)70040-5] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Casting distortion and inadequate handling in the dental laboratory are 2 factors that can cause misfit between a cast framework and the implant analogs in the master cast. This article describes the CrescoTi Precision procedure, which has been developed for correction of misfit between cast titanium frameworks and supporting dental implants. The simplicity and accuracy of the procedure appear to demonstrate technical progress toward obtaining optimal precision of fit of the superstructure components, thereby eliminating stress forces that may be transformed to the peri-implant bone.
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Affiliation(s)
- L B Helldén
- North Alvsborg Central Hospital, Trollhättan, Sweden.
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Brunton PA, Smith P, McCord JF, Wilson NH. Procera all-ceramic crowns: a new approach to an old problem? Br Dent J 1999; 186:430-4. [PMID: 10365489 DOI: 10.1038/sj.bdj.4800134] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Increasing patient expectations regarding the appearance of restorations continue to test the ingenuity and skill of the dental team. To this end the quest for sufficiently strong, metal-free, all-ceramic restorations to function in all areas of the mouth continues apace. We report on a possible solution to this problem that uses computer-aided design/computer-aided milling (CAD/CAM) technology coupled with a novel, densely sintered, ceramic material. In this article we offer suggestions for case selection, preparation design, and luting procedures, and in addition illustrate these with a number of completed cases.
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Odén A, Andersson M, Krystek-Ondracek I, Magnusson D. Five-year clinical evaluation of Procera AllCeram crowns. J Prosthet Dent 1998; 80:450-6. [PMID: 9791792 DOI: 10.1016/s0022-3913(98)70010-1] [Citation(s) in RCA: 154] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
STATEMENT OF PROBLEM Esthetic demands of patients and practitioners for an all-ceramic crown in both anterior and posterior regions of the dental arches has prompted the development of the Procera AllCeram crown. Long-term clinical trials that evaluate the strength and naturalness of the Procera AllCeram crown are lacking. PURPOSE This prospective study was initiated to evaluate the clinical performance of 100 Procera AllCeram crowns after 5 years in service. MATERIAL AND METHODS One hundred Procera AllCeram crowns were fabricated for 58 patients (20 men and 38 women). Patients were treated by 4 general dental practitioners. Crown placement involved both the anterior and posterior regions of the dental arches. Crowns were examined at baseline and once a year during the 5 years that followed and evaluated at each appointment with the California Dental Association's quality assessment system. RESULTS Of the 97 crowns remaining in the study after 5 years, only 3 crowns had experienced a fracture through the veneering porcelain and the aluminum oxide coping material. Two additional crowns were replaced as a result of fractures of only the veneering porcelain. One crown was replaced as a result of recurrent caries. All remaining crowns were ranked as either excellent or acceptable for surface/color, anatomic form, and marginal integrity. CONCLUSION The 5-year clinical observations and ranking with the California Dental Association's quality assessment criteria supported the conclusion that Procera AllCeram crowns may be used in all areas of the mouth.
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Affiliation(s)
- A Odén
- Department of Dental Biomaterials Science, Karolinska Institute, Huddinge, Sweden
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Willer J, Rossbach A, Weber HP. Computer-assisted milling of dental restorations using a new CAD/CAM data acquisition system. J Prosthet Dent 1998; 80:346-53. [PMID: 9760368 DOI: 10.1016/s0022-3913(98)70136-2] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
BACKGROUND Recent technologic innovations have created possibilities for restorative dentistry, such as computer-aided design and computer-aided manufacturing (CAD/CAM). PURPOSE This article presents a new CAD/CAM process that has been developed for the fabrication of dental restorations. METHODS This process uses an improved imaging technique, successfully applied in other industries. Imaging is accomplished with 2-dimensional line grids projected onto an object, which allows for a mathematical reproduction of prepared and unprepared tooth surfaces, including those that are outside the direct line of light. The relative position of the sensor to the surface of the object is controlled automatically. CONCLUSIONS This system, which is undergoing clinical testing, allows the generation of various types of highly accurate dental restorations (inlays, onlays, crown, and fixed partial dentures) from a number of different materials. Acquired digitized data points are directly translated from the sensor to the electronic controls of the milling machine to provide various manufacturing possibilities, including copy milling and accurate reproduction of occlusal tooth surfaces in various materials.
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Affiliation(s)
- J Willer
- Center of Dental Medicine, University of Hannover, Germany
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