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https://www.readbyqxmd.com/read/27890357/effect-of-cement-space-on-stress-distribution-in-y-tzp-based-crowns
#1
Carlos Eduardo Edwards Rezende, Ana Flávia Sanches Borges, Carla Castiglia Gonzaga, Yuanyuan Duan, José Henrique Rubo, Jason Alan Griggs
OBJECTIVE: To evaluate the stress distribution in bi-layered Y-TZP based crowns, according to the occlusal internal spacing between coping and abutment. METHODS: Twelve premolar shaped Y-TZP copings were made by a CAD/CAM system and seated on an abutment to evaluate the internal fit at the occlusal third using micro-CT images. Considering the fitting range obtained experimentally, two 3D finite element models, consisting on bone tissue, a titanium implant, a zirconia abutment, cement layer and a bi-layered Y-TZP ceramic crown were constructed based on the micro-CT images, one corresponding to the thinnest cement space and other representing the specimen with the thickest cement space obtained experimentally...
November 24, 2016: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/27870167/design-of-complete-dentures-by-adopting-cad-developed-for-fixed-prostheses
#2
Yanfeng Li, Weili Han, Jing Cao, Yuan Iv, Yue Zhang, Yishi Han, Yi Shen, Zheng Ma, Huanyue Liu
The demand for complete dentures is expected to increase worldwide, but complete dentures are mainly designed and fabricated manually involving a broad series of clinical and laboratory procedures. Therefore, the quality of complete dentures largely depends on the skills of the dentist and technician, leading to difficulty in quality control. Computer-aided design and manufacturing (CAD/CAM) has been used to design and fabricate various dental restorations including dental inlays, veneers, crowns, partial crowns, and fixed partial dentures (FPDs)...
November 21, 2016: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/27866055/microstructure-and-nanoindentation-analyses-of-low-temperature-aging-on-the-zirconia-porcelain-interface
#3
M D Peng, J Q Wei, Y N Wang, Q Li
The aim of the present study was to investigate the effects of low-temperature aging on the micro-mechanical and micro-structural properties of zirconia-porcelain interface. In total, thirty-three Y-TZP zirconia blocks were fabricated by using CAD/CAM technology, veneered with porcelains. Specimens were submitted to low-temperature aging in an autoclave at 134°C, additional 0.2MPa pressure for 0h, 5h, or 10h. Flexural strength was obtained by using three-point bending test. Micro-mechanical properties (nano-hardness (H) and reduced modulus (Er)) were investigated by nanoindentation tests...
November 11, 2016: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/27796072/time-efficiency-analysis-of-the-treatment-with-monolithic-implant-crowns-in-a-digital-workflow-a-randomized-controlled-trial
#4
Tim Joda, Urs Brägger
OBJECTIVES: The aim of the randomized controlled trial was to analyze time-efficiency of a treatment with implant crowns made of monolithic lithium disilicate (LS2) plus titanium base vs. porcelain fuse to zirconium dioxide (ZrO2 ) in a digital workflow. MATERIALS AND METHODS: Twenty study participants were included for single-tooth replacement in premolar and molar sites. Baseline was the start of the prosthetic treatment. All patients received transocclusal screw-retained implant reconstructions on a soft tissue level-type implant...
November 2016: Clinical Oral Implants Research
https://www.readbyqxmd.com/read/27671466/fatigue-behavior-of-resin-modified-monolithic-cad-cam-rnc-crowns-and-endocrowns
#5
G T Rocca, P Sedlakova, C M Saratti, R Sedlacek, L Gregor, N Rizcalla, A J Feilzer, I Krejci
OBJECTIVE: To evaluate the influence of different types of modifications with resin on fatigue resistance and failure behavior of CAD-CAM resin nano ceramic (RNC) restorations for maxillary first premolars. METHODS: Sixty standardized resin composite root dies received CAD-CAM RNC endocrowns (n=30) and crowns (n=30) (Lava Ultimate, 3M Espe). Restorations were divided into six groups: full anatomic endocrowns (group A) and crowns (group D), buccal resin veneered endocrowns (group B) and crowns (group E) and buccal resin veneered endocrowns (group C) and crowns (group F) with a central groove resin filling...
December 2016: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/27671465/porcelain-bonding-to-novel-co-cr-alloys-influence-of-interfacial-reactions-on-phase-stability-plasticity-and-adhesion
#6
Kai Chun Li, LeYing Tran, David J Prior, J Neil Waddell, Michael V Swain
OBJECTIVE: The objective of the present study was to determine the hardness and adhesion strength at the porcelain to alloy interface. METHODS: 15 bi-layer porcelain veneered Co-Cr specimens of each alloy group [cast, powder metallurgy (PM), CAD/CAM(CC)] were manufactured. 12 bi-layered specimens were tested using four-point bend strain energy release rate adhesion test. One before and after porcelain firing specimen of each alloy group were nano-indented at the bulk and metal-porcelain interface to determine the mechanical properties...
December 2016: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/27668099/esthetic-rehabilitation-through-crown-lengthening-surgery-and-conservative-cad-cam-veneers-a-multidisciplinary-case-report
#7
Leandro Passos, Fernando Peixoto Soares, Mauricio Gallo
This case report describes a successful multidisciplinary approach used to improve the smile esthetics of a patient presenting with excessive gingival display, asymmetric gingival margins, and small upper anterior teeth and lower anterior teeth. The treatment combined esthetic crown lengthening, dental bleaching, and restorative dentistry using CAD/CAM veneer. The 6-month follow-up examination confirmed the stability of the modification and absence of adverse effects.
2016: Case Reports in Dentistry
https://www.readbyqxmd.com/read/27595717/effect-of-repeated-firings-on-microtensile-bond-strength-of-bi-layered-lithium-disilicate-ceramics-e-max-cad-and-e-max-press
#8
Hamid Jalali, Zeinab Bahrani, Somayeh Zeighami
AIM: To achieve acceptable contour, color, esthetics, and occlusal relations, the porcelain may be subjected to several firing cycles. This study sought to assess the effect of multiple firing cycles on the microtensile bond strength (MTBS) of lithium disilicate-based ceramics (e.max Press, e.max CAD). MATERIALS AND METHODS: IPS e.max computer aided design (CAD) cores were fabricated using CAD/(Computer Aided Manufacturing (CAM)) technology, and IPS e.max Press cores were fabricated using the heat-pressing technique (12 × 12 × 4 mm(3))...
2016: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/27570943/retrospective-2-to-7-year-follow-up-study-of-20-double-full-arch-implant-supported-monolithic-zirconia-fixed-prostheses-measurements-and-recommendations-for-optimal-design
#9
Fernando Rojas Vizcaya
PURPOSE: To measure the extension of cantilever lengths, thicknesses, and heights of zirconia prostheses in the lingual and facial areas of the distal screw access openings, and to evaluate the clinical performance regarding chipping or fracture of the distal cantilevered sections of double full-arch CAD/CAM screw-retained, stained, monolithic zirconia, gingival-colored ceramic implant-supported fixed prostheses (MZ-FPs). MATERIALS AND METHODS: Ten edentulous patients were provided with a total of 20 CAD/CAM double full-arch MZ-FPs...
August 29, 2016: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
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/27507992/in-vitro-effect-of-porcelain-firing-cycle-and-different-thicknesses-of-ips-e-max-cad-core-on-marginal-accuracy-of-all-ceramic-restorations
#11
Ezatollah Jalalian, Arash Zarbakhsh, Zahra Mohtashamrad, Nazanin Nourbakhsh, Esmat Jafarpour
OBJECTIVES: Marginal adaptation is important for long-term success of full-coverage restorations. The aim of this study was to determine the effect of porcelain firing cycle and different thicknesses of IPS e.max core on marginal accuracy of all-ceramic restorations. MATERIALS AND METHODS: A standard stainless steel die with 0.8 mm classic chamfer finish line and 10° taper was used in this in vitro study. An impression was taken from the stainless steel die to fabricate 20 epoxy resin dies, which were then scanned and IPS e...
November 2015: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/27478442/a-new-total-digital-smile-planning-technique-3d-dsp-to-fabricate-cad-cam-mockups-for-esthetic-crowns-and-veneers
#12
F Cattoni, F Mastrangelo, E F Gherlone, G Gastaldi
Purpose. Recently, the request of patients is changed in terms of not only esthetic but also previsualization therapy planning. The aim of this study is to evaluate a new 3D-CAD-CAM digital planning technique that uses a total digital smile process. Materials and Methods. Study participants included 28 adult dental patients, aged 19 to 53 years, with no oral, periodontal, or systemic diseases. For each patient, 3 intra- and extraoral pictures and intraoral digital impressions were taken. The digital images improved from the 2D Digital Smile System software and the scanner stereolithographic (STL) file was matched into the 3D-Digital Smile System to obtain a virtual previsualization of teeth and smile design...
2016: International Journal of Dentistry
https://www.readbyqxmd.com/read/27273727/modified-peek-resin-bonded-fixed-dental-prosthesis-for-a-young-cleft-lip-and-palate-patient
#13
Efstathia Andrikopoulou, Panagiotis Zoidis, Ioli-Ioanna Artopoulou, Asterios Doukoudakis
OBJECTIVE: This clinical report presents the use of a modified poly ether-ether ketone material as an alternative material for the fabrication of resin-bonded fixed dental prosthesis (RBFDP) framework. This new material can be used for patients allergic to metals, maintaining the same high esthetic demand of ceramics, presenting light weightness and a flexibility similar to bone as a distinct advantage over ceramic materials. CONCLUSIONS: The use of a BioHPP RBFDP framework could be considered as an alternative restoration for the replacement of missing lateral incisors in young patients with cleft palate defects...
July 2016: Journal of Esthetic and Restorative Dentistry
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
#14
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/27163490/veneered-zirconia-based-restorations-fracture-resistance-analysis
#15
Ahed Al-Wahadni, Ahmad Shahin, Kenneth S Kurtz
PURPOSE: To examine the effects of the veneering technique on the fracture resistance of zirconia-based crowns. MATERIALS AND METHODS: An artificial tooth was prepared with a 1.2 mm heavy chamfer finish line and 8° taper. The prepared tooth was scanned using CAD/CAM technology to fabricate 45 cobalt chromium (CoCr) testing dies. One CoCr die was scanned, and 45 zirconia copings were milled and divided according to the veneering technique into three groups of 15 specimens each: layering veneering (LV) using Vita Vm9, overpressing veneering (OV) using Vita Pm9, and digital veneering (DV) using Vita Triluxe forte...
May 10, 2016: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/27159089/an-in-vitro-investigation-of-veneered-zirconia-based-restorations-shade-reproducibility
#16
Ahed Al-Wahadni, Ahmad Shahin, Kenneth S Kurtz
PURPOSE: To examine the effects of the veneering technique on the shade reproducibility of zirconia-based crowns. MATERIALS AND METHODS: An artificial tooth was prepared with a 1.2 mm heavy chamfer finish line and 8° taper. The prepared tooth was scanned using CAD/CAM technology to fabricate 45 cobalt chromium (CoCr) testing dies. One CoCr die was scanned, and 45 zirconia copings were milled and devided according to the veneering technique into 3 groups of 15 specimens each: layering veneering (LV) using Vita Vm9, overpressing veneering (OV) using Vita Pm9, and digital veneering (DV) using Vita Triluxe forte...
May 9, 2016: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/27148985/marginal-vertical-discrepancies-of-monolithic-and-veneered-zirconia-and-metal-ceramic-three-unit-posterior-fixed-dental-prostheses
#17
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/27132785/simplified-treatment-of-severe-dental-erosion-with-ultrathin-cad-cam-composite-occlusal-veneers-and-anterior-bilaminar%C3%A2-veneers
#18
Luís Henrique Schlichting, Tayane Holz Resende, Kátia Rodrigues Reis, Pascal Magne
Restorative treatment for patients with dental erosion requires an analysis of the degree of structural damage. Patients affected by moderate to severe dental erosion are particularly challenging because complex occlusal reconstruction will be needed. Ultrathin bonded occlusal veneers represent a conservative alternative to traditional onlays and complete coverage crowns for the treatment of severe erosion. This article describes a complete mouth rehabilitation with ultrathin computer-aided design and computer-aided manufacturing (CAD/CAM) composite resin occlusal veneers in a patient with a severely eroded dentition...
April 29, 2016: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/26948081/effect-of-screw-access-channels-on-the-fracture-resistance-of-3-types-of-ceramic-implant-supported-crowns
#19
Ahmed Naguib M Hussien, Mohammad M Rayyan, Nagwa M Sayed, Lucette G Segaan, Charles J Goodacre, Mathew T Kattadiyil
STATEMENT OF PROBLEM: Access channels for retrieving ceramic implant-supported screw-retained crowns may decrease their fracture resistance. PURPOSE: The purpose of this in vitro study was to evaluate the effect of screw-access channels on 3 types of ceramic implant-supported crowns. MATERIAL AND METHODS: Sixty computer-aided designed and computer-aided manufactured (CAD-CAM) ceramic implant-supported screw-retained maxillary premolar crowns were fabricated, 30 with an occlusal screw-access channel and 30 without access channels...
August 2016: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/26877989/marginal-and-internal-fit-of-nano-composite-cad-cam-restorations
#20
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
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