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N G Fischer, A Tsujimoto, A G Baruth
OBJECTIVE: Limited information is available on how to polish and finish zirconia surfaces following computer-aided design/computer-aided manufacturing (CAD/CAM), specifically, how differing application forces and reuse of zirconia polishing systems affect zirconia topography. PURPOSE: To determine the effect of differing, clinically relevant, polishing application forces and multiple usages of polishing burs on the surface topography of CAD/CAM zirconia. METHODS: One hundred twenty 220-grit carbide finished zirconia disks were sintered according to manufacturer's directions and divided into two groups for the study of two coarse polishing bur types...
March 16, 2018: Operative Dentistry
Jan Brandt, Martin Brenner, Hans-Christoph Lauer, Silvia Brandt
PURPOSE: The aim of this in vitro study was to evaluate the accuracy of template-guided implantation planned with implant-planning software (Implant Studio), comparing computer-aided design/computer-assisted manufacture (CAD/CAM)-based measurements with measurements via cone beam computed tomography (CBCT). MATERIALS AND METHODS: Thirty template-guided implantations were planned and performed on acrylic-resin models. The implant positions were detected with an intraoral scanner, evaluated with CAD quality-control software, and compared with the planned positions in the test group...
March 2018: International Journal of Oral & Maxillofacial Implants
Hyung-In Yoon, Paul J Sohn, Sharon Jin, Elani Hawazin, Sang J Lee
PURPOSE: To examine the fracture resistance of premolars restored with CAD/CAM lithium disilicate mesio-occlusal-distal (MOD) inlays and onlays of different cavity designs. MATERIALS AND METHODS: Two widths of occlusal isthmus (75%, 100% of intercuspal distance) and three designs of cuspal coverage (none, palatal, complete) were used for the preparation of MOD inlays and onlays in the extracted maxillary premolars. Sixty lithium disilicate restorations were milled and bonded into the cavities...
March 13, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
John Henry Pang, Sebastian Brooke, Mark W Kubik, Robert L Ferris, Matilda Dhima, Matthew M Hanasono, Eric W Wang, Mario G Solari
No abstract text is available yet for this article.
March 12, 2018: Journal of Reconstructive Microsurgery
Xueyin An, Jing-Huan Fang, Seung-Mi Jeong, Byung-Ho Choi
An interim restoration is a prototype for the definitive prosthesis and preserves the occlusal information and the original vertical dimension of the occlusion. Several techniques have been developed to transfer the information from implant-supported fixed interim to definitive restoration. However, these conventional techniques have limitations, and they are time-consuming, require making impressions and stone casts, and mounting in an articulator. The purpose of this article was to describe a digital technique to accurately transfer the information from complete-arch implant interim restoration to definitive restorations without using definitive casts...
March 8, 2018: Journal of Prosthetic Dentistry
Maren Teichmann, Anna Lena Wienert, Marcia Rückbeil, Volker Weber, Stefan Wolfart, Daniel Edelhoff
OBJECTIVES: To prospectively evaluate the clinical long-term outcome of 3- to 6-unit fixed dental prostheses (FDPs) made of hot isostatic pressed (HIP) zirconia frameworks, veneered with a synthetic sintering glass-ceramic. MATERIALS AND METHODS: A total of 27 different restorations were cemented in 21 patients. FDPs were examined with regard to biological and technical complications/failures. Additionally, clinical quality was assessed based on (i) the California Dental Association (CDA) criteria, (ii) the patient's viewpoint according to Hickel, and (iii) periodontal parameters...
March 8, 2018: Clinical Oral Investigations
O Sagsoz, M Yildiz, A S L Hojjat Ghahramanzadeh, A Alsaran
Objective: The purpose of this study was to examine the fracture strength and surface microhardness of computer-aided design/computer-aided manufacturing (CAD/CAM) materials in vitro. Materials and Methods: Mesial-occlusal-distal inlays were made from five different CAD/CAM materials (feldspathic ceramic, CEREC blocs; leucite-reinforced ceramic, IPS Empress CAD; resin nano ceramic, 3M ESPE Lava Ultimate; hybrid ceramic, VITA Enamic; and lithium disilicate ceramic, IPS e...
March 2018: Nigerian Journal of Clinical Practice
Paolo Pesce, Francesco Pera, Paolo Setti, Maria Menini
PURPOSE: To evaluate the accuracy and precision of a digital scanner used to scan four implants positioned according to an immediate loading implant protocol and to assess the accuracy of an aluminum framework fabricated from a digital impression. MATERIALS AND METHODS: Five master casts reproducing different edentulous maxillae with four tilted implants were used. Four scan bodies were screwed onto the low-profile abutments, and a digital intraoral scanner was used to perform five digital impressions of each master cast...
March 2018: International Journal of Prosthodontics
Brian J Goodacre, Charles J Goodacre
The newest impression techniques use intraoral scanners to capture both the hard and soft tissues. However, with edentulous patients, the accuracy of an intraoral scanner to capture an acceptable impression for the fabrication of a complete denture needs to be evaluated. Therefore, the purpose of this report of two patient treatments is to describe a technique that used intraoral scanning to record mucosal morphology and fabricate computer-aided design/computer-assisted manufacture (CAD/CAM) complete dentures...
March 2018: International Journal of Prosthodontics
Otto Steinmassl, Vincent Offermanns, Wolfgang Stöckl, Herbert Dumfahrt, Ingrid Grunert, Patricia-Anca Steinmassl
Computer-aided design and computer-aided manufacturing (CAD/CAM) denture base manufacturers claim to produce their resin pucks under high heat and pressure. Therefore, CAD/CAM dentures are assumed to have enhanced mechanical properties and, as a result, are often produced with lower denture base thicknesses than conventional, manually fabricated dentures. The aim of this study was to investigate if commercially available CAD/CAM denture base resins have more favourable mechanical properties than conventionally processed denture base resins...
March 8, 2018: Materials
Murali Srinivasan, Harald Gjengedal, Maria Cattani-Lorente, Mira Moussa, Stéphane Durual, Martin Schimmel, Frauke Müller
This study compared the biocompatibility, mechanical properties, and surface roughness of a pre-polymerized polymethyl methacrylate (PMMA) resin for CAD/CAM complete removable dental prostheses (CRDPs) and a traditional heat-polymerized PMMA resin. Two groups of resin substrates [Control (RC): conventional PMMA; Test (RA): CAD/CAM PMMA] were fabricated. Human primary osteoblasts and mouse embryonic-fibroblasts were cultured for biocompatibility assays. Mechanical properties and surface roughness were compared...
March 6, 2018: Dental Materials Journal
(no author information available yet)
[This corrects the article doi: 10.1590/1807-3107bor-2017.vol31.0109].
March 1, 2018: Brazilian Oral Research
J P Andrade, D Stona, H R Bittencourt, G A Borges, L H Burnett, A M Spohr
The aim was to evaluate, in vitro, the influence of different computer-aided design/computer-aided manufacturing (CAD/CAM) materials (IPS e.max CAD, Vita Enamic, and Lava Ultimate) and thicknesses (0.6 mm and 1.5 mm) on the fracture resistance of occlusal veneers. Sixty human third molars were prepared to simulate advanced erosion of the occlusal surface, and the teeth were randomly divided into six experimental groups (n=10) according to the material and thickness used to build the veneers. Ten sound teeth formed the control group...
March 7, 2018: Operative Dentistry
Christopher Lund, Peter Guevara
Currently, there is no consensus on whether crowns fabricated via computer-aided design/computer-aided manufacturing (CAD/CAM) need to be replaced following an endodontic procedure. The aim of this in vitro study was to evaluate the effect of endodontic access preparation and repair on the failure load of lithium disilicate and resin nanoceramic crowns. The hypothesis was that there would be no difference in the failure load between the intact and repaired crowns. Eighty identical mandibular CAD/CAM crowns (40 lithium disilicate glass ceramic [IPS e...
March 2018: General Dentistry
Xiaoling Yu, Xiaosheng Cheng, Ning Dai, Hu Chen, Changjiang Yu, Yuchun Sun
BACKGROUND AND OBJECTIVE: In dentistry, the complete denture is a conventional treatment for edentulous patients. The computer-aided design and computer-aided manufacturing (CAD/CAM) has been applied on the digital complete denture which is developed rapidly. Tooth selection and arrangement is one of the most important parts in digital complete denture. In this paper, we propose a new method of personalized teeth arrangement. METHODS: This paper presents a method of arranging teeth virtually for a complete denture...
March 2018: Computer Methods and Programs in Biomedicine
Moritz Zimmermann, Andre Valcanaia, Gisele Neiva, Albert Mehl, Dennis Fasbinder
PURPOSE: A wide variety of CAD/CAM materials are available for single-tooth restorations. CAD/CAM material characteristics are different and may influence CAM fabrication accuracy. There is no study investigating the influence of different CAD/CAM materials on the final fit of the restoration. The aim of this study was to evaluate the fit of endocrowns fabricated from different CAD/CAM materials using a new 3D evaluation method with an intraoral scanning system. The null hypothesis was that there are no significant differences for the fitting accuracy of different CAD/CAM materials...
March 6, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
Alec D Zurek, Maria F Alfaro, Alvin G Wee, Judy Chia-Chun Yuan, Valentim A Barao, Mathew T Mathew, Cortino Sukotjo
PURPOSE: In the field of prosthodontics, patients often require complex and extensive restorative care. This can involve the use of dental restorations to restore teeth on both the maxillary and mandibular arch. Current literature has evaluated the wear properties of different dental ceramics against enamel, but studies regarding dental ceramics opposing one another are limited. The purpose of this study was to assess the wear potential and wear behavior of CAD/CAM zirconia (ZR) and lithium disilicate (LD) materials against a similar ceramic material, and how the surface finish of these dental ceramics might affect patterns of wear...
March 6, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
Neslihan Tekçe, Sinan Fidan, Safa Tuncer, Dilan Kara, Mustafa Demirci
PURPOSE: To investigate the effect of accelerated aging on surface properties of glazed CAD/CAM resin blocks using a 2D surface profilometer and a 3D non-contact optical profilometer. MATERIALS AND METHODS: Three types of CAD/CAM resin restorative materials, LAVA Ultimate (3M ESPE, St Paul, MN, USA), VITA Enamic (Vita Zahnfabrik H. Rauter, Bad Säckingen, Germany), and Cerasmart (GC Corparation, Tokyo, Japan) were used for this study. CAD/CAM blocks were cut in 3-mm thickness slabs and divided into three groups; Group 1: control group (specimens polished with 600 grit SCI paper); Group 2: specimens sandblasted, silanized, and glazed with Optiglaze Color (GC); Group 3: glazed specimens subjected to 5000 thermocycles (n=15)...
February 2018: Journal of Advanced Prosthodontics
Ferhan Egilmez, Gulfem Ergun, Isil Cekic-Nagas, Pekka Kalevi Vallittu, Lippo Veli Juhana Lassila
PURPOSE: The purpose of this study was to derive and compare the inherent color (hue angle, chroma), translucency (TPSCI ), surface gloss (ΔE* SCE-SCI ), and surface roughness (Ra ) amongst selected shades and brands of three hybrid CAD/CAM blocks [GC Cerasmart (CS); Lava Ultimate (LU); Vita Enamic (VE)]. MATERIALS AND METHODS: The specimens (N = 225) were prepared into square-shaped (12 × 12 mm2 ) with different thicknesses and shades. The measurements of color, translucency, and surface gloss were performed by a reflection spectrophotometer...
February 2018: Journal of Advanced Prosthodontics
Sina Safari, Fereshteh Hosseini Ghavam, Parviz Amini, Kaveh Yaghmaei
PURPOSE: The aim of this study was to evaluate the effects of abutment diameter, cement type, and re-cementation on the retention of implant-supported CAD/CAM metal copings over short abutments. MATERIALS AND METHODS: Sixty abutments with two different diameters, the height of which was reduced to 3 mm, were vertically mounted in acrylic resin blocks with matching implant analogues. The specimens were divided into 2 diameter groups: 4.5 mm and 5.5 mm (n=30). For each abutment a CAD/CAM metal coping was manufactured, with an occlusal loop...
February 2018: Journal of Advanced Prosthodontics
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