scholarly journals Influence of metal-ceramic fixed dental restorations on the occurrence of discoloration of gingiva

2006 ◽  
Vol 63 (4) ◽  
pp. 409-413 ◽  
Author(s):  
Ljubisa Ristic ◽  
Srbislav Ilic ◽  
Aleksandar Zivanovic
Keyword(s):  
Histopathological Examination ◽  
Atomic Absorption Spectrophotometry ◽  
Gingival Tissue ◽  
Dental Restorations ◽  
Metal Contents ◽  
Metal Ceramic ◽  
Therapeutic Procedures ◽  
Cast Alloys ◽  
Ceramic Crowns ◽  
Dental Cast

Background. Adverse effects of dental cast alloys on the health of patients are the problem in clinical practice. The aim of this paper was to describe the case of a patient with discolorated gingivae in the presence of fixed dental restorations and used diagnostic and therapeutic procedures. Case report. A 30-year old patient, presented with the complaints about unsatisfactory esthetic of his fixed dental restorations. He complained about the greyish discoloration of gingivae, inappropriate color of the crowns, and a larger space between the central incisors. Both discolorated and normal gingivae around the fixed dental restorations were taken by excision and the samples of gingivae were examined histopathologically, and by using the Atomic Absorption Spectrophotometry test (AAS). Histopathological examination of the discolorated gingivae showed the presence of non-specific inflammation with a foreign body. AAS revealed the presence of various metals in the samples and the higher metal contents in the samples of discolorated gingivae as compared with the samples of normal gingivae. New metal-ceramic crowns were made for the patient. Conclusion. A main cause of greyish discoloration of gingivae was presence of a metal in gingival tissue. After the excision of discolorated gingivae old metalceramic crowns should be replaced with new crowns.

scholarly journals Discoloration of gingiva in the presence of fixed dental restorations

2005 ◽  
Vol 62 (5) ◽  
pp. 371-376 ◽  
Author(s):  
Ljubisa Ristic ◽  
Zivorad Miljkovic ◽  
Srbislav Ilic ◽  
Tatjana Djuric
Keyword(s):  
Foreign Body ◽  
Clinical Examination ◽  
Gold Alloy ◽  
Histopathological Examination ◽  
Giant Cells ◽  
Metal Particles ◽  
Gingival Tissue ◽  
Histopathological Changes ◽  
Dental Restorations ◽  
Large Particles

Aim. To investigate the frequency of discoloration of gingiva in the presence of fixed dental restorations, regarding the type of alloy of which restorations were made, and to show histopathological changes of discolored gingiva. Methods. One hundred and eighty four patients of both sexes were examined. The average age of the examinees was 52. They were divided into four groups according to the alloys from which their restorations were made. Standardized history questionnaires and clinical examination procedures were developed for this study. In ten examinees, whose teeth were indicated for extraction and who had a discoloration of gingiva, the samples of tissue were taken from the discolored gingiva for histopathological examination. Results. Our results showed the presence of discolored gingiva in all four groups. It was most frequent in the examinees with fixed restorations made of Ni-Cr alloy (43,5%) and less frequent in those with fixed dental restorations made of gold alloy (26,5%). Histopathological examination showed the presence of tissue foreign body granulomas with giant cells in which the metal particles were found, partially as small and partially as large particles. Conclusion. Results suggested that grayish discoloration of gingiva was present in all four groups of examinees. The highest number of examinees with discolored gingiva was in the group with restorations made of Ni-Cr alloy. Grayish discoloration of gingiva was a consequence of incorporation of metal particles into gingival tissue.

Analysis of Internal and Marginal fit of Metal-ceramic Crowns During Processing, Using Conventional and Digitized Technologies

2018 ◽  
Vol 69 (7) ◽  
pp. 1699-1701
Author(s):  
Cristina Elena Savencu ◽  
Sorin Porojan ◽  
Liliana Porojan
Keyword(s):  
Clinical Success ◽  
Replica Technique ◽  
Digital Light Processing ◽  
Marginal Fit ◽  
Dental Restorations ◽  
Metal Ceramic ◽  
Ceramic Crowns ◽  
Internal Fit ◽  
Pattern Group

Copings accuracy is an important factor for long-term clinical success of ceramic fused to metal dental restorations. The purpose of the study was to investigate marginal and internal fit of metal-ceramic crowns during processing, using conventional and digitized technologies. Metal copings were produced by Digital light Processing (DLP), invested and casted. Ceramic veneers were overpressed. Internal and marginal fit was measured using silicon replica technique for patterns, casted frameworks and final ceramic fused to metal crowns. Best adaptation was found in resin-pattern group, with small increasing of gap after casting and after ceramic pressing.

scholarly journals An Ultrastructural Study on the Effect of High Temperatures on Teeth and Restorative Materials That Aids in the Identification of Human Remains

2021 ◽  
Vol 2021 ◽  
pp. 1-6
Author(s):  
V. Yashoda ◽  
Manay Srinivas Munisekhar ◽  
S. Shylaja ◽  
Krishna A. Rao ◽  
Sharath Kumar Reddy ◽  
...  
Keyword(s):  
High Temperatures ◽  
Elemental Analysis ◽  
Naked Eye ◽  
Dental Restorations ◽  
Good Imaging ◽  
Metal Ceramic ◽  
Restorative Materials ◽  
Different Temperatures ◽  
Ceramic Crowns ◽  
Crown Preparation

Introduction. In most disasters, teeth are the only means of positive identification of an otherwise unrecognizable body, as there has been tremendous increase in the use of dental restorations that have different resistance to prolonged high temperature which is an important aid in identifying burned victims. Application of SEM/EDS in forensics was found useful in areas where there is a need for good imaging with high magnification combined with elemental analysis. The objective of this study was to analyze incineration effects on teeth and restorative materials using SEM/EDS. Materials and Method. 128 extracted teeth were collected, 96 were restored with silver amalgam, composite, and GIC of 32 each, and crown preparation was done in 32 teeth for which metal ceramic crowns were prepared. These teeth were subjected to 4 different temperatures (500°C, 700°C, 900°C, and 1100°C) for 20 minutes, and they were analyzed macroscopically and by using SEM for the changes subsequent to their exposure to such high temperatures. Results. All the restorations which were very difficult to identify by naked eye were identified with the help of SEM/EDS. Conclusion. Elemental analysis of the specific restorative material proves to be an essential tool for the forensic odontologist.

Assessment of the compressive strength of the metal-ceramic connections in fixed dental restorations

2016 ◽  
Vol 79 (2) ◽  
pp. 66-73
Author(s):  
P. Malara ◽  
K. Paluch ◽  
K. Sobolewska ◽  
A. Pasieka
Keyword(s):  
Compressive Strength ◽  
Compression Test ◽  
Hardness Test ◽  
Good Option ◽  
Static Compression ◽  
Dental Restorations ◽  
Metal Ceramic ◽  
Ceramic Crowns ◽  
Scanning Electron ◽  
Artificial Tooth

Purpose: The purpose of the work was to evaluate the compressive strength of metalceramicconnections in the fixed dental restorations.Design/methodology/approach: Restorations were made on a model of the naturalpatient's dentition which was developed specifically for this study. The study included 10metal - porcelain crowns, for each group of teeth. Their production used Remanium 2000+alloy and porcelain Vita VMK Master. A static compression test was carried out on the finalcrowns and Vicker's hardness test was performed. Visual observations were carried out ona scanning electron microscope.Findings: On the basis of the research and the discussion it was possible to concludethat metal-porcelain crowns have a greater compressive strength than natural human teeth.Thus, they are more resistant to occlusal forces and the crowns for the first molars are thestrongest restorations.Practical implications: The metal-porcelain crowns are a very good option for teethrestoration and they can be used even in the areas of the mouth where the occlusal forcesreach the maximum values.Originality/value: The article focuses on testing of compressive strength of metal-ceramiccrowns. The comparison with natural human occlusal forces shows the sufficient mechanicalproperties of metal-ceramic crowns for application in humans. The artificial tooth geometryallows applying prosthetic crowns in the patient's mouth without the risk of ceramic breakdown.

Assessment of heavy metals in tobacco of cigarettes commonly sold in Ethiopia

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Heavy Metals ◽  
Trace Metals ◽  
Atomic Absorption Spectrophotometry ◽  
Epidemiological Studies ◽  
Cigarette Tobacco ◽  
Absorption Spectrophotometry ◽  
Wet Digestion ◽  
Metal Contents ◽  
Cu And Zn ◽  
Significant Flux

A significant flux of heavy metals, among other toxins, reaches the lungs through smoking. This study reports Cd, Pb, Cu and Zn contents in tobacco of 11 brands of cigarette commonly sold in Ethiopia. The heavy metals were determined by atomic absorption spectrophotometry after wet digestion of cigarette tobacco using HNO3 and H2O2. The concentration of trace metals in the cigarettes ranged (mean) (μg/g), Cd: 1.3−7.6 (2.48±0.32), Pb: 0.50−12.50 (6.24±2.2), Cu: 2.89−25.35 (13.70±4.12) and Zn: 24.40−62.55 (36.22±7.50) while Ni was not detected in all the eleven brands of cigarettes. Comparable levels of trace metals were obtained in the tobacco of both imported and Ethiopian cigarettes. The average trace metal contents of cigarettes available in Ethiopia were Cd 1.82±0.39, Pb 4.23±0.97, Cu 10.2±3.1 and Zn 28.2±7.8 μg/cigarette and a person who smokes 20 cigarettes per day is estimated to increase his/her daily Cd, Pb, Cu and Zn retention by approximately 0.036, 0.085, 0.204, 0.564 mg/day, respectively. The results indicate that smoking and exposure to cigarette smoke is a serious problem to be taken into account when carrying out epidemiological studies on human exposure to trace metals.

Fit of metal ceramic crowns cast in Au-1.6wt% Ti alloy for different abutment finish line curvature

2006 ◽  
Vol 22 (5) ◽  
pp. 397-404 ◽  
Author(s):  
Jianxiang Tao ◽  
Masanobu Yoda ◽  
Kohei Kimura ◽  
Osamu Okuno
Keyword(s):  
Ti Alloy ◽  
Finish Line ◽  
Metal Ceramic ◽  
Ceramic Crowns

PROSPECTS FOR MANUFACTURING FRAMES OF METAL CERAMIC STRUCTURES OF DENTAL PROSTHESES BY THE METHOD OF SELECTIVE LASER SINTERING

2021 ◽  
pp. 232-239
Author(s):  
Stepanov V.A. ◽  
Shemonaev V.I. ◽  
Buyanov E.A. ◽  
Grachev D.V. ◽  
Parchomenko A.N. ◽  
...  
Keyword(s):  
Objective Assessment ◽  
Selective Laser Sintering ◽  
Clinical Effectiveness ◽  
Study Groups ◽  
Laser Sintering ◽  
Dental Prostheses ◽  
Metal Ceramic ◽  
Abutment Teeth ◽  
Ceramic Crowns ◽  
Solid Tissues

The article presents the results of evaluating the prototyping of metal-ceramic structures made by casting and selective laser sintering. To achieve this goal, 27 patients with fabricated metal-ceramic crowns and bridgeworks were examined. Two study groups were created. The first group included 14 patients for whom dental prosthesis frameworks were made by casting. The second group consisted of 13 people, for whom the frames of dentures were made by the method of selective laser sintering. The analysis of clinical effectiveness was carried out according to the following criteria: 1- precision of the felling of prosthesis frame to solid tissues of abutment teeth; 2- the condition of the marginal periodontium; 3- the integrity of the ceramic cladding. The results of the study showed that the precision to solid tooth tissues of metal-ceramic dental prostheses made by laser selective sintering is higher than of frames made by casting. In accordance to the second criteria the best results were also shown by the participants of the second group. No chipping of the ceramic veneer from the metal-ceramic denture frameworks made by laser selective sintering was found. Thus, dentures which frameworks are made by the method of selective laser sintering are characterized by a higher objective assessment of their precision to the solid tissues of the abutment teeth. Lesions of the marginal periodontium both inflammatory and dystrophic were less in the participants of the second group. The frequency of defects in the coating of metal-ceramic dentures was significantly lower in the case of fabrication frameworks by laser selective sintering.

Precision of fit of two margin designs for metal-ceramic crowns

2008 ◽  
Vol os15 (1) ◽  
pp. 32-32
Author(s):  
P Limkangwalmongkol ◽  
GJ Chiche ◽  
MB Blatz
Keyword(s):  
Metal Ceramic ◽  
Ceramic Crowns

scholarly journals Eugenol-based temporary luting cement possesses antioxidative properties

2014 ◽  
Vol 142 (11-12) ◽  
pp. 669-674 ◽  
Author(s):  
Dragan Ilic ◽  
Kosovka Obradovic-Djuricic ◽  
Djordje Antonijevic ◽  
Tatjana Todorovic
Keyword(s):  
Dental Materials ◽  
Study Groups ◽  
Biological Tissues ◽  
Gingival Tissue ◽  
Liquid Component ◽  
Dental Cement ◽  
Antioxidative Properties ◽  
Dental Restorations ◽  
Luting Cement ◽  
Anti Inflammatory

Introduction. Antioxidants protect against reactive oxygen species and expose beneficial anti-inflammatory activity when in contact with biological tissues. Dental materials that are used as temporary luting on fixed dental restorations are often in contact with injured gingival tissue, hence they should contain anti-inflammatory characteristics that are essential after prosthetic procedures preceding cementation of final restauration. Objective. The aim of this study was to investigate the antioxidant effect through the oxidation inhibition (OI) of mixed dental cement for temporary luting or their liquid component. Methods. Eight study groups were prepared each by ten samples: 1) ex tempore preparation of zinc-oxide eugenol paste (Kariofil Z Galenika, Serbia), 2) Viko Temp paste (Galenika, Serbia), 3) Temp Bond NE paste (Kerr, Germany), 4) ScutaBond (ESPE, Germany), 5) Cp-CAP paste (Germany, Lege Artis) and oil component of 6) Kariofil Z, 7) Viko Temp and 8) Cp-CAP. The samples were subjected to spectrophotometer to measure OI 2,2?-azino-di-(3-ethyl-benzthiazoline-6-sulphonic acid) (ABTS) using Randox kit, United Kingdom. The control samples were pure ascorbic acid (1% w/v). Results. High values of OI exposed materials (groups 1, 5, 6, 7, 8) with content of eugenol (or its derivates) in the range of 100-88.8% were statistically more significant than the values of non-eugenol substances (groups 2, 3, 4) with the range of 8.2-43.5%. Conclusion. Eugenol containing temporary fixation materials show significant antioxidative properties and therefore they may be used in those clinical situations where surrounding gingival tissue is injured during restorative procedure.

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