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Veneer margin fit

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
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
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
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
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
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
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
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
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
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
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
Seda Varol, Yasemin Kulak-Özkan
PURPOSE: To compare marginal and internal fit between 3- and 4-unit press-on-metal (PoM) ceramic, zirconia-supported, and conventional metal ceramic fixed partial dentures (FPDs) before and after veneering. MATERIALS AND METHODS: Ten pieces for each 3- and 4-unit MC, IPS InLine PoM, and IPS e.max ZirCAD/Zir Press FPDs were produced. Cross-sections from silicone replicas were examined and measured with a light microscope. Occlusal, axial, intermarginal, and marginal mean adaptation scores of cross-sectioned replicas and means of measurements obtained from 4 sites were calculated independently...
July 2015: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
Anja Zembic, Alexander Otto Hermann Philipp, Christoph Hans Franz Hämmerle, Arnold Wohlwend, Irena Sailer
BACKGROUND: Clinical studies on zirconia abutments report very good survival rates and biological and technical results, but few have an observation period of more than 5 years. PURPOSE: The aim of this study was to assess the long-term performance of customized zirconia implant abutments supporting all-ceramic crowns. MATERIALS AND METHODS: Twenty-seven patients receiving 54 single implants were included (25 incisors, 14 canines, 15 premolars in both jaws)...
October 2015: Clinical Implant Dentistry and related Research
J M van der Zel, J W J M Dekker, P W Balfoort
Around the year 2000, zirconia was introduced in dentistry. It is a material with great strength and attractive aesthetic properties, such as translucency and colour. Recent advances in digital dentistry are aimed at veneering the supporting structure ofzirconia with a layer of glass ceramics by means of an automated process. With the Primero process, a transparent outer layer of glass ceramic is applied directly onto the zirconia core, milled in the green stage and sintered. Because the restorations produced in this way have a two-layer structure like natural teeth, they obtain an aesthetic look similar to natural dental elements...
February 2014: Nederlands Tijdschrift Voor Tandheelkunde
Mathieu Contrepois, Arnaud Soenen, Michel Bartala, Odile Laviole
STATEMENT OF PROBLEM: After the development of a variety of ceramic restorative systems over the past 20 years, the fabrication of fixed dental prostheses has undergone considerable change. Esthetics and resistance to fracture are two of the main determinants of the success of a restoration; the third is marginal adaptation. Therefore, a systematic review of the literature dedicated to the marginal accuracy of ceramic systems is indicated. PURPOSE: This study reviewed the current scientific literature that pertains to the marginal fit of ceramic crowns fabricated with different systems and investigated the factors that influence marginal adaptation...
December 2013: Journal of Prosthetic Dentistry
Márcia Borba, Walter Gomes Miranda, Paulo Francisco Cesar, Jason Allan Griggs, Alvaro Della Bona
The objective of the study was to measure the marginal and internal fit of zirconia-based all-ceramic three-unit fixed partial dentures (FPDs) (Y-TZP - LAVA, 3M-ESPE), using a novel methodology based on micro-computed tomography (micro-CT) technology. Stainless steel models of prepared abutments were fabricated to design FPDs. Ten frameworks were produced with 9 mm2 connector cross-sections using a LAVATM CAD-CAM system. All FPDs were veneered with a compatible porcelain. Each FPD was seated on the original model and scanned using micro-CT...
September 2013: Brazilian Oral Research
Per Svanborg, Lena Längström, Ritva Moisio Lundh, Göran Bjerkstig, Anders Ortorp
PURPOSE: The aim of this retrospective study was to evaluate the 5-year clinical outcome for ceramic veneered cobalt-chromium (Co-Cr) fixed dental prostheses (FDPs) fitted in a private clinical setting. MATERIALS AND METHODS: All patients treated consecutively with Co-Cr FDPs from January 2000 to November 2005 were included, and complications were registered. Patient records were examined for details on the restorations and abutment teeth. A total of 149 patients with 201 FDPs, 1,135 units, and 743 abutment teeth were recorded...
July 2013: International Journal of Prosthodontics
K M Regish, D Sharma, D R Prithviraj, A Nair, R Raghavan
This study compares the internal fit and marginal adaptation of copy milled Zirconia copings with Nickel-Chromium (Ni-Cr) copings fabricated using a lost wax technique before and after ceramic veneering. A standardized metal master die simulating a prepared crown was fabricated and twenty impressions of the metal die were made and poured with die stone. Wax patterns were made on ten dies and cast while light cure resin patterns were made on the other ten dies for copy milling the Zirconia copings. Five specimens from each group were subjected to ceramic veneering...
March 2013: European Journal of Prosthodontics and Restorative Dentistry
Francisco Martinez-Rus, Alberto Ferreiroa, Mutlu Ozcan, Guillermo Pradies
PURPOSE: To evaluate the marginal discrepancy of monolithic and veneered all-ceramic crown systems cemented on titanium (Ti) and zirconia implant abutments. MATERIAL AND METHODS: Sixty customized implant abutments for a maxillary right central incisor were fabricated of Ti and zirconia (n = 30 of each) for an internal-connection implant system. All-ceramic crowns were fabricated using the following systems (n = 10 per group): monolithic with computer-aided design/computer-assisted manufacture (CAD/CAM) lithium disilicate (MLD), pressed lithium disilicate (PLD), or CAD yttrium-stabilized tetragonal zirconia polycrystal (Y-TZP)...
March 2013: International Journal of Oral & Maxillofacial Implants
Petya K Brawek, Stefan Wolfart, Lutz Endres, Armin Kirsten, Sven Reich
OBJECTIVES: The purpose of the study was to compare the accuracy of crowns exclusively fabricated by the digital workflow of two systems. The null hypothesis stated was: Both systems do not differ with respect to marginal and internal accuracy. MATERIALS AND METHODS: In 14 patients, 13 molars and 1 premolar were prepared. Each preparation was scanned intraorally with two different digital impression systems, Lava COS and Cerec AC. On the basis of these data, Lava DVS crowns [DVS] and Vita Rapid Layering Technique crowns [RLT] were fabricated, respectively...
December 2013: Clinical Oral Investigations
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