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Cement space measure cad/cam

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https://www.readbyqxmd.com/read/27824983/fit-of-e-max-crowns-fabricated-using-conventional-and-cad-cam-technology-a-comparative-study
#1
Atsushi Miwa, Hidehiro Kori, Yoshihiro Tsukiyama, Rika Kuwatsuru, Yasuyuki Matsushita, Kiyoshi Koyano
PURPOSE: The aim of this study was to examine the fit accuracy of e.max crowns by investigating marginal and internal gaps. MATERIALS AND METHODS: In experiment 1, 60 e.max computer-aided design/computer-assisted manufacture (CAD/CAM) crowns were manufactured. The crowns were fabricated using optical scanning of artificial teeth (Op group) or scanning of a plaster model following a silicone impression (M group). Cement space settings of 90, 120, and 150 μm were applied...
November 2016: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/27460314/effect-of-cement-space-on-the-marginal-fit-of-cad-cam-fabricated-monolithic-zirconia-crowns
#2
Ediz Kale, Emre Şeker, Burak Yilmaz, Tuncer Burak Özçelik
STATEMENT OF PROBLEM: Monolithic zirconia crowns fabricated with computer-aided design and computer-aided manufacturing (CAD-CAM) have recently become a common practice for the restoration of posterior teeth. The marginal fit of monolithic zirconia crowns may be affected by different cement space parameters set in the CAD software. Information is scarce regarding the effect of cement space on the marginal fit of monolithic zirconia crowns fabricated with CAD-CAM technology. PURPOSE: The purpose of this in vitro study was to evaluate the effect of cement space on the marginal fit of CAD-CAM-fabricated monolithic zirconia crowns before cementation...
July 25, 2016: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/24111810/accuracy-of-ceramic-restorations-made-using-an-in-office-optical-scanning-technique-an-in-vitro-study
#3
P Tidehag, K Ottosson, G Sjögren
The present in vitro study concerns determination of the pre-cementation gap width of all-ceramic crowns made using an in-office digital-impression technique and subsequent computer-aided design/computer-aided manufacturing (CAD/CAM) production. Two chairside video camera systems were used: the Lava Oral scanner and Cadent's iTero scanner. Digital scans were made of a first molar typodont tooth that was suitably prepared for an all-ceramic crown. The digital impressions were sent via the Internet to commercial dental laboratories, where the crowns were made...
May 2014: Operative Dentistry
https://www.readbyqxmd.com/read/23387964/cement-selection-for-implant-supported-crowns-fabricated-with-different-luting-space-settings
#4
COMPARATIVE STUDY
Pinar Gultekin, B Alper Gultekin, Murat Aydin, Serdar Yalcin
PURPOSE: To measure and compare the retentive strength of cements specifically formulated for luting restorations onto implant abutments and to investigate the effect of varying cement gap on retention strength of implant-supported crowns. MATERIALS AND METHODS: Standard titanium abutments were scanned by means of a 3D digital laser scanner. One hundred and sixty standard metal copings were designed by a Computer Aided Design/Computer Aided Manufacturing (CAD/CAM) system with two cement gap values (20 and 40 μm)...
February 2013: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/22141231/influence-of-preparation-form-luting-space-setting-and-cement-type-on-the-marginal-and-internal-fit-of-cad-cam-crown-copings
#5
R Hmaidouch, P Neumann, W-D Mueller
PURPOSE: To evaluate the influence of two different tooth preparation forms, two luting space settings and two cement types on the marginal and internal adaptation of all-ceramic crown copings produced using Cerec3 CAD/CAM system. MATERIALS AND METHODS: Forty working stone dies were made from two metal master casts (1. Tooth 36: with anatomic occlusal reduction, 2. Tooth 36: with flat occlusal reduction). Forty crown copings were milled using Vita In-Ceram 2000 YZ: 20 with an luting space settings of 0 = 100 microm and 20 with -50 = 50 microm...
2011: International Journal of Computerized Dentistry
https://www.readbyqxmd.com/read/21842005/a-new-triple-scan-protocol-for-3d-fit-assessment-of-dental-restorations
#6
Stefan Holst, Matthias Karl, Manfred Wichmann, Ragai-Edward T Matta
OBJECTIVE: Assessing the level of precision entailed by the virtual fit of dental restorations is a very challenging issue. A cement space between an abutment tooth and a dental restoration is a clinical requisite that precludes the application of conventional best-fit registration protocols routinely applied in industrial precision measurements. Since two-dimensional fit assessment techniques currently used in dentistry miss important information about the third dimension, a new protocol was developed to provide three-dimensional information for the virtual registration of the digitized restoration with respect to the abutment...
September 2011: Quintessence International
https://www.readbyqxmd.com/read/20932564/a-new-method-to-test-the-fracture-probability-of-all-ceramic-crowns-with-a-dual-axis-chewing-simulator
#7
COMPARATIVE STUDY
S D Heintze, T Albrecht, A Cavalleri, M Steiner
OBJECTIVES: The purpose of this study was to validate a new laboratory method to test all-ceramic systems with regard to the proportion of failures. METHODS: Sixteen standardized mandibular molar crowns consisting of two different materials (IPS Empress, IPS e.max Press) were adhesively luted on CAD/CAM milled PMMA abutments (first lower molar, circular chamfer). All crowns were loaded applying an eccentric force in a Willytec chewing simulator (steel stylus, Ø 2...
February 2011: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/20801185/two-imaging-techniques-for-3d-quantification-of-pre-cementation-space-for-cad-cam-crowns
#8
COMPARATIVE STUDY
Patchanee Rungruanganunt, J Robert Kelly, Douglas J Adams
OBJECTIVES: Internal three-dimensional (3D) "fit" of prostheses to prepared teeth is likely more important clinically than "fit" judged only at the level of the margin (i.e. marginal "opening"). This work evaluates two techniques for quantitatively defining 3D "fit", both using pre-cementation space impressions: X-ray microcomputed tomography (micro-CT) and quantitative optical analysis. Both techniques are of interest for comparison of CAD/CAM system capabilities and for documenting "fit" as part of clinical studies...
December 2010: Journal of Dentistry
https://www.readbyqxmd.com/read/19961996/a-comparison-of-the-marginal-vertical-discrepancies-of-zirconium-and-metal-ceramic-posterior-fixed-dental-prostheses-before-and-after-cementation
#9
COMPARATIVE STUDY
Esther Gonzalo, Maria J Suárez, Benjamin Serrano, Jose F L Lozano
STATEMENT OF PROBLEM: Marginal discrepancies of zirconia posterior fixed dental prostheses (FDPs) fabricated using various systems have been assessed to determine the quality of the restorations and facilitate clinical use; however, studies are limited and results are ambiguous because of the sample sizes and measurement methods. PURPOSE: The purpose of this in vitro study was to compare changes in marginal fit of posterior fixed dental prostheses of 3 zirconia systems manufactured using CAD/CAM technology and metal ceramic posterior fixed dental protheses fabricated with the conventional lost-wax technique, before and after cementation...
December 2009: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/16279739/in-vitro-study-on-marginal-and-internal-fit-of-cad-cam-all-ceramic-crowns
#10
Takashi Nakamura, Hideaki Tanaka, Soichiro Kinuta, Takeshi Akao, Kei Okamoto, Kazumichi Wakabayashi, Hirofumi Yatani
The purpose of this study was to evaluate the marginal and internal fit of all-ceramic crowns fabricated using the Decsy CAD/CAM system. A master die of maxillary first premolar was measured, and experimental crowns were fabricated. Four conditions were established by combining two convergence angles (4 degrees and 12 degrees) of the abutment with two different luting space settings (15 microm and 55 microm). The results showed that the experimental crowns had a marginal gap of 42 to 56 microm. When the luting space setting was 15 microm, the internal gap was 85-88 microm; when the setting was 55 microm, the internal gap was 126-138 microm...
September 2005: Dental Materials Journal
https://www.readbyqxmd.com/read/11203526/interface-dimensions-of-cerec-2-mod-inlays
#11
N Martin, N M Jedynakiewicz
OBJECTIVES: To quantify the width of the cement interface between ceramic inlays generated by the CEREC-2 CAD-CAM system and the tooth, and to determine the effect of cement viscosity on the interface width. METHODS: Standardised MOD cavities were cut in 15 human premolar teeth using a custom paralleling device. A ceramic inlay was made with a CEREC-2 CAD-CAM machine for each tooth. The inlays were cemented using one of three resin-based composite systems of varying viscosity; a hybrid microfilled posterior composite, a compomer restorative and a dual-cure luting composite...
January 2000: Dental Materials: Official Publication of the Academy of Dental Materials
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