نتایج جستجو برای: porcelain

تعداد نتایج: 2620  

2015
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 v...

Journal: :The Journal of prosthetic dentistry 2017
Chunling Ge Chad C Green Dalene A Sederstrom Edward A McLaren James A Chalfant Shane N White

STATEMENT OF PROBLEM Bonded porcelain veneers are widely used esthetic restorations. High success and survival rates have been reported, but failures do occur. Fractures are the commonest failure mode. Minimally invasive or thin veneers have gained popularity. Increased enamel and porcelain thickness improve the strength of veneers bonded to enamel, but less is known about dentin or mixed subst...

2010
Yohei KAWAI Motohiro UO Fumio WATARI

Synopsis The application of zirconia ceramics for the dental restorations and dental implants has increased. However the weak performance of the veneering porcelains and low adhesion to the zirconia framework were reported. In this study, the micro-structure, elemental distribution and crystal phase around the interface between zirconia and veneering porcelain were estimated using SEM-EDS (ener...

2001
Hong Zhao Xiaozhi Hu Mark B. Bush Brian R. Lawn

A preceding study of contact damage in a bilayer system consisting of a porcelain coating on a stiff Pd-alloy substrate is here expanded to investigate the role of substrate modulus and hardness. Bilayers are made by fusing the same dental porcelain onto Co-, Pd-, and Au-alloy metal bases. Indentations are made on the porcelain surfaces using spheres of radii 2.38 and 3.98 mm. Critical loads to...

Journal: :Dental materials journal 1995
M Kikuchi K Takakuda H Miyairi O Okuno

To examine a new concept for computerized production of dental prostheses, an experimental porcelain forming system was devised. Unlike other dental CAM systems, the system is intended to form porcelain much as human technicians do. The system builds up an object by alternately applying water and droplets of porcelain powder. Test specimens were made by forming porcelain powder into square plat...

2010
Hyun-Soon Pak Jung-Suk Han Jai-Bong Lee Sung-Hun Kim Jae-Ho Yang

PURPOSE Marginal fit is a very important factor considering the restoration's long-term success. However, adding porcelain to copings can cause distortion and lead to an inadequate fit which exposes more luting material to the oral environment and causes secondary caries. The purpose of this study was to compare the marginal fit of 2 different all-ceramic crown systems before and after porcelai...

Journal: :journal of dental biomaterials 0
ali mohamad pahlavanpour fard jahromy zohreh borhan haghighi ghodratallah roudini elahe shirzaei sani

statement of problem: the effect of porcelain surface on the antagonist acrylic teeth has not been widely studied. objectives: this study aimed to investigate the effect of polished porcelain, glazed porcelain, and natural teeth (as the control group) on the acrylic resin teeth. materials and methods: in this experimental-laboratory study, a total of 60 specimens of glazed and polished porcelai...

2013
Ali Riza Tuncdemir Erhan Dilber Haluk Baris Kara A. Nilgun Ozturk

The aim of this study was to compare the effects of different porcelain polishing techniques on the color change and surface roughness of feldspathic porcelains and lithium disilicate glass-ceramic system. 80 porcelain specimens were divided into two subgroups, each subgroup was divided into 4 groups of 10 specimens. Surfaces were polished with different ceramic polishers. VITA Easyshade spectr...

Journal: :journal of dentistry, shiraz university of medical sciences 0
mostafa sadeghi dept. of operative dentistry, school of dentistry, rafsanjan university of medical sciences, rafsanjan, iran. abdolrahim davari dept. of operative dentistry, member of social determinants of oral health research center, dental school, shahid sadoughi university of medical sciences, yazd, iran. amin abolghasami mahani postgraduate student, polymer faculty, tehran university, tehran, iran. hamid hakimi dept. of microbiology, school of medicine, rafsanjan university of medical sciences, rafsanjan, iran.

statement of the problem: porcelain may fracture or chip if exposed to any traumas and can be repaired by using a resin composite. purpose: this study was aimed to evaluate the influences of er:yag laser on shear bond strength (sbs) of resin composite to feldspathic porcelain. materials and method: seventy-two porcelain blocks were divided into six groups (n=12): g1: no treatment (control group...

Journal: :Journal of oral science 2010
Futoshi Komine Ayako Saito Kazuhisa Kobayashi Mai Koizuka Hiroyasu Koizumi Hideo Matsumura

The purpose of the present study was to evaluate the effect of cooling rates after firing procedures of veneering porcelain on shear bond strength between veneering porcelain and a zirconium dioxide (zirconia; ZrO₂) ceramic material. A total of 48 ZrO₂ disks were divided equally into three groups. Two veneering porcelains that are recommended for ZrO₂ material - Cerabien ZR (CZR), IPS e.max Cer...

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