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Veneer margin fit

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https://www.readbyqxmd.com/read/28969917/influence-of-spark-erosion-on-the-fit-of-screw-retained-co-cr-fixed-complete-denture-frameworks-veneered-with-different-materials
#1
Anna Gabriella Camacho Presotto, Luciana Valadares Oliveira, Marina Xavier Pisani, Valentim Adelino Ricardo Barão, Marcelo Ferraz Mesquita
STATEMENT OF PROBLEM: Spark erosion is a fit corrective technology that can be used even after the veneering material has been applied. The framework does not require sectioning, thus preserving its mechanical resistance. However, the spark erosion effect on veneered Co-Cr fixed complete denture (FCD) frameworks has not been investigated. PURPOSE: The purpose of this in vitro study was to evaluate whether spark erosion is effective in improving marginal fit on screw-retained Co-Cr FCD frameworks veneered with different materials...
September 29, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28662859/monolithic-zirconia-dental-crowns-internal-fit-margin-quality-fracture-mode-and-load-at-fracture
#2
Christian Schriwer, Anneli Skjold, Nils Roar Gjerdet, Marit Øilo
OBJECTIVE: Dental all-ceramic restorations of zirconia, with and without an aesthetic veneering layer, have become a viable alternative to conventional metal-ceramic restorations. The aim of this study was to evaluate whether factors of the production methods or the material compositions affect load at fracture, fracture modes, internal fit or crown margins of monolithic zirconia crowns. METHODS: Sixty crowns made from six different commercially available dental zirconias were produced to a model tooth with a shallow circumferential chamfer preparation...
June 26, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28586234/the-direct-indirect-technique-for-composite-restorations-revisited
#3
André V Ritter, Newton Fahl, Marcos Vargas, Rodrigo R Maia
In the direct-indirect composite technique, composite is applied to a nonretentive tooth preparation (eg, a noncarious cervical lesion or a veneer/inlay/onlay preparation) without any bonding agent, sculpted to a primary anatomic form, and light-cured. The partially polymerized restoration is then removed from the preparation and finished and tempered extraorally chairside. The finished inlay is bonded to the preparation using a resin-based luting agent. Advantages of this technique include enhanced physical and mechanical properties afforded by the extraoral chairside tempering process because of increased monomer conversion, and greater operator control over the final marginal adaptation, surface finishing and polishing, and anatomy of the restoration, given that these elements are defined outside of the patient's mouth...
June 2017: Compendium of Continuing Education in Dentistry
https://www.readbyqxmd.com/read/28555208/comparison-of-immediately-loaded-flapless-placed-one-piece-implants-and-flapped-placed-conventionally-loaded-two-piece-implants-both-fitted-with-all-ceramic-single-crowns-%C3%A2-in-the-posterior-mandible-3-year-results-from-%C3%A2-a-randomised-controlled-pilot-trial
#4
RANDOMIZED CONTROLLED TRIAL
Wolfgang Bömicke, Olaf Gabbert, Andreas Koob, Johannes Krisam, Peter Rammelsberg
PURPOSE: To compare outcomes for immediately loaded one-piece implants (OPI), placed flapless, and conventionally loaded two-piece implants (TPI), placed after two-stage flapped surgery. MATERIALS AND METHODS: Thirty-eight participants were randomised to receive either one OPI (19 participants, OPI group) or one TPI (19 participants, TPI group) inserted in the posterior mandible with a torque of at least 35 Ncm according to a parallel group design. OPI were immediately loaded with non-occluding temporary crowns...
2017: European Journal of Oral Implantology
https://www.readbyqxmd.com/read/28091875/the-effect-of-veneering-on-the-marginal-fit-of-cad-cam-generated-copy-milled-and-cast-metal-copings
#5
Sabit Melih Ates, Zeynep Yesil Duymus, Ipek Caglar, Bilal Hologlu
OBJECTIVE: This in vitro study investigated the marginal fit of metal and zirconia copings before and after veneering on dies with shoulder/chamfer (s/c) finish lines. MATERIALS AND METHODS: Using CAD/CAM, ten (n = 10) each s/c zirconia (NZ) copings and ten (n = 10) each s/c metal (MM) copings were generated. As controls, ten (n = 10) each s/c zirconia copings were copy-milled (ZZ) and ten (n = 10) each s/c metal copings were cast (CC). The vertical marginal discrepancy of the copings was measured at 20 predefined spots of the circular shoulder and chamfer finish lines in microns (μm) before and after a first and a second veneering firing using a stereomicroscope at ×40 magnification...
January 13, 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/28018561/comparison-of-the-fit-accuracy-of-zirconia-based-prostheses-generated-by-two-cad-cam-systems
#6
Seok-Joon Ha, Jin-Hyun Cho
PURPOSE: The purposes of this study are to evaluate the internal and marginal adaptation of two widely used CAD/CAM systems and to study the effect of porcelain press veneering process on the prosthesis adaptation. MATERIALS AND METHODS: Molar of a lower jaw typodont resin model was prepared by adjusting a 1.0 mm circumferential chamfer, an occlusal reduction of 2.0 mm, and a 5° convergence angle and was duplicated as an abrasion-resistant master die. The monolithic crowns and copings were fabricated with two different CAD/CAM system-Ceramil and Zirkonzahn systems...
December 2016: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/27987513/-preliminary-clinical-evaluation-of-the-esthetic-effect-of-deep-discolored-anterior-teeth-restored-with-zirconia-veneers
#7
T F Zhou, X Z Wang, J Y Liu, Q Sun, X K Wang
OBJECTIVE: To observe the esthetic effect of deep discolored anterior teeth restored by zirconia veneers. METHODS: Small defected deep discolored anterior teeth with complete root canal therapy were restored by zirconia veneers (n=15). The same name teeth on the other side of the same dental arch were chosen as control teeth. The color difference values ΔE of the neck 1/3, the middle 1/3 and the incisor 1/3 between the deep discolored tooth and the normal control tooth before and after therapy were measured to evaluate the esthetic effect of zirconia veneer restoration...
December 18, 2016: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/27829765/comparative-study-on-the-tensile-bond-strength-and-marginal-fit-of-complete-veneer-cast-metal-crowns-using-various-luting-agents-an-in-vitro-study
#8
B Devi Parameswari, M Rajakumar, G Lambodaran, Shyam Sundar
INTRODUCTION: Several commercially available luting agents are used to cement the dental restorations such as intra-coronal, extra-coronal, and fixed partial dentures. Tensile bond strength (TBS) and accurate marginal fit are the essential factors to determine the good clinical results in fixed prosthesis. The retentivity of the luting cements is assessed by their adhesive capacity over the tooth surface and metal surface. Generally, the adhesive ability has been evaluated with in vitro testing, with tensile bond tests...
October 2016: Journal of Pharmacy & Bioallied Sciences
https://www.readbyqxmd.com/read/27796574/clinical-performance-of-screw-retained-and-cemented-implant-supported-zirconia-single-crowns-36-month-results
#9
Claudio Cacaci, Friederike Cantner, Thomas Mücke, Peter Randelzhofer, Jan Hajtó, Florian Beuer
OBJECTIVES: The objective of this clinical study was to evaluate the clinical performance of implant-supported zirconia crowns with a sintered veneering cap. Furthermore, the influence of the type of retention (screw-retained vs cemented single crowns) was analysed. MATERIALS AND METHODS: Fifty-eight patients were accommodated with 114 implants, inserted in the molar and premolar regions. Zirconia-based crowns with a sintered veneering cap were either screw-retained (n = 53) or cemented (n = 61) on the implant...
July 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/27559346/comparison-of-marginal-fit-and-fracture-strength-of-a-cad-cam-zirconia-crown-with-two-preparation-designs
#10
Hamid Jalali, Leyla Sadighpour, Ali Miri, Ahmad Reza Shamshiri
OBJECTIVES: The purpose of this in vitro study was to compare the marginal adaptation and fracture resistance of a zirconia-based all-ceramic restoration with two preparation designs. MATERIALS AND METHODS: Twenty-four mandibular premolars were randomly divided into two groups (n=12); the conventional group received a peripheral shoulder preparation and the modified group received a buccal shoulder and proximal/lingual chamfer preparation. The marginal fit of the zirconia crowns (Cercon) was evaluated using a stereomicroscope...
December 2015: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/27274344/marginal-adaptation-of-spinell-inceram-and-feldspathic-porcelain-laminate-veneers
#11
Tahereh Ghaffari, Fahimeh Hamedi-Rad, Vahid Fakhrzadeh
BACKGROUND: This in vitro study investigated the marginal fit of two porcelain laminate veneers to help the selection of more accurate veneers in discolored teeth. MATERIALS AND METHODS: Thirty impressions of metal master die created from the prepared labial surface of an acrylic maxillary central incisor were made and poured with Type IV stone. The dies were distributed into test groups (n = 15) for the construction of DuCeram and InCeram laminate veneers. An image-analysis program was used to measure the gap between the veneers and the master die at the labial, lingual, and proximal margins...
May 2016: Dental Research Journal
https://www.readbyqxmd.com/read/27266201/-influence-of-different-designs-and-porcelain-glaze-firing-on-the-marginal-and-internal-fit-of-implant-supported-zirconia-crowns
#12
Liu Cuiling, Gao Xu, Qi Yuping, Yang Liyuan
OBJECTIVE: This study investigated the influence of different designs and porcelain/glaze firing on the marginal and internal fit of three kinds of computer aided design/computer aided manufacturing (CAD/CAM) zirconia ceramic implant-supported crowns. METHODS: Three groups of zirconia ceramic implant-supported crowns with different designs were produced from copings by using a Cercon CAD/CAM system (n = 8). The first two groups comprised double-layer crowns (zirconia coping + veneer) with regular (Group A) and full circumferential zirconia-collar marginal designs (Group B)...
February 2016: Hua Xi Kou Qiang Yi Xue za Zhi, Huaxi Kouqiang Yixue Zazhi, West China Journal of Stomatology
https://www.readbyqxmd.com/read/27148985/marginal-vertical-discrepancies-of-monolithic-and-veneered-zirconia-and-metal-ceramic-three-unit-posterior-fixed-dental-prostheses
#13
COMPARATIVE STUDY
Carlos Lopez-Suarez, Esther Gonzalo, Jesus Pelaez, Benjamin Serrano, Maria J Suarez
PURPOSE: The aim of this study was to investigate and compare the marginal fit of posterior fixed dental prostheses (FDPs) made of monolithic and veneered computer-aided design/computer-assisted manufacture (CAD/CAM) zirconia ceramic with metal-ceramic posterior FDPs. MATERIALS AND METHODS: Thirty standardized steel dies were prepared to receive posterior three-unit FDPs. Specimens were randomly divided into three groups (n = 10): (1) metal-ceramic (control group), (2) veneered zirconia, and (3) monolithic zirconia...
May 2016: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/26877989/marginal-and-internal-fit-of-nano-composite-cad-cam-restorations
#14
So-Hyun Park, Yeon-Jee Yoo, Yoo-Jin Shin, Byeong-Hoon Cho, Seung-Ho Baek
OBJECTIVES: The purpose of this study was to compare the marginal and internal fit of nano-composite CAD-CAM restorations. MATERIALS AND METHODS: A full veneer crown and an mesio-occluso-distal (MOD) inlay cavity, which were prepared on extracted human molars, were used as templates of epoxy resin replicas. The prepared teeth were scanned and CAD-CAM restorations were milled using Lava Ultimate (LU) and experimental nano-composite CAD/CAM blocks (EB) under the same milling parameters...
February 2016: Restorative Dentistry & Endodontics
https://www.readbyqxmd.com/read/26140175/the-effect-of-various-veneering-techniques-on-the-marginal-fit-of-zirconia-copings
#15
Kianoosh Torabi, Mahroo Vojdani, Rashin Giti, Masumeh Taghva, Soheil Pardis
PURPOSE: This study aimed to evaluate the fit of zirconia ceramics before and after veneering, using 3 different veneering processes (layering, press-over, and CAD-on techniques). MATERIALS AND METHODS: Thirty standardized zirconia CAD/CAM frameworks were constructed and divided into three groups of 10 each. The first group was veneered using the traditional layering technique. Press-over and CAD-on techniques were used to veneer second and third groups. The marginal gap of specimens was measured before and after veneering process at 18 sites on the master die using a digital microscope...
June 2015: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/26046107/the-effect-of-porcelain-firing-and-type-of-finish-line-on-the-marginal-fit-of-zirconia-copings
#16
Mahroo Vojdani, Anahita Safari, Mina Mohaghegh, Soheil Pardis, Farideh Mahdavi
STATEMENT OF THE PROBLEM: Although all-ceramic restorations are broadly used, there is a lack of information concerning how their fit is affected by fabrication procedure and marginal configuration. PURPOSE: The purpose of this study was to evaluate the marginal fit of zirconia CAD/CAM ceramic crowns before and after porcelain firing. The influence of finish line configuration on the marginal fit was also evaluated. MATERIALS AND METHOD: Twenty standardized zirconia CAD/CAM copings were fabricated for chamfer and shoulder finish line designs (n=10)...
June 2015: Journal of Dentistry
https://www.readbyqxmd.com/read/25961620/influence-of-polyurethane-resin-dies-on-the-fit-and-adaptation-of-full-veneer-crowns
#17
Graeme R R Lillywhite, Fahim Vohra
CONTEXT: Polyurethane resin is a possible alternative to type IV dental stone for fabrication of indirect restorations however its dimensional accuracy is questionable. AIM: The aim was to investigate the dimensional accuracy of silica filled polyurethane resin die material by evaluating the marginal fit and adaptation of indirect gold castings. SETTINGS AND DESIGN: Experimental, in vitro study. MATERIALS AND METHODS: Totally 40 copper plated replicas of a nickel chrome master die analogous to a veneer gold crown preparation were made and impressions recorded using polyvinylsiloxane material...
January 2015: Indian Journal of Dental Research: Official Publication of Indian Society for Dental Research
https://www.readbyqxmd.com/read/25882973/performance-of-zirconia-ceramic-cantilever-fixed-dental-prostheses-3-year-results-from-a-prospective-randomized-controlled-pilot-study
#18
RANDOMIZED CONTROLLED TRIAL
Andreas Zenthöfer, Brigitte Ohlmann, Peter Rammelsberg, Wolfgang Bömicke
STATEMENT OF PROBLEM: Little is known about the clinical performance of ceramic cantilever fixed dental prostheses on natural teeth. PURPOSE: The purpose of this randomized controlled pilot study was to evaluate the clinical performance of ceramic and metal ceramic cantilever fixed dental prostheses (CFDPs) after 3 years of service. MATERIAL AND METHODS: Twenty-one participants were randomly allocated to 2 treatment groups. Participants in the ceramic (ZC) group (n=11) each received 1 CFDP made of yttria-stabilized, tetragonal zirconia polycrystal; the others (n=10) were fitted with a metal ceramic (MC) CFDP...
July 2015: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/25858218/comparison-of-marginal-and-internal-fit-of-press-on-metal-and-conventional-ceramic-systems-for-three-and-four-unit-implant-supported-partial-fixed-dental-prostheses-an-in-vitro-study
#19
COMPARATIVE STUDY
Emre Bayramoğlu, Yasemin Kulak Özkan, Coşkun Yildiz
STATEMENT OF PROBLEM: Adaptation is an important factor in the long-term clinical success of implant supported ceramic restorations. Ceramic firings may affect the adaptation of the restoration. PURPOSE: The purpose of this study was to compare the marginal and internal adaptation of 3 different restorative materials and the effect of veneering/pressing on the material used for 3- and 4-unit implant supported fixed dental prostheses. MATERIAL AND METHODS: One mandibular epoxy cast was prepared for 3-unit restorations and one for 4-unit restorations...
July 2015: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/25740305/fitting-accuracy-and-fracture-resistance-of-crowns-using-a-hybrid-zirconia-frame-made-of-both-porous-and-dense-zirconia
#20
Takashi Nakamura, Tsuyoshi Sugano, Hirofumi Usami, Kazumichi Wakabayashi, Hiroshi Ohnishi, Tohru Sekino, Hirofumi Yatani
The purpose of this study is to evaluate the fitting accuracy and fracture resistance of crowns using a hybrid zirconia frame made of both porous and dense zirconia. Commercial semi-sintered zirconia, sintered dense zirconia and sintered hybrid zirconia were used. Sintered zirconia was milled using the CAD/CAM system, and semi-sintered zirconia was milled and sintered to fabricate molar crown frames. Completed frames were veneered with tooth-colored porcelain. The marginal and internal gaps between frames/crowns and abutments were measured...
2015: Dental Materials Journal
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