scholarly journals Repeated exposure of acidic beverages on esthetic restorative materials: An in-vitro surface microhardness study

2016 ◽  
pp. 0-0
Author(s):  
AM Xavier ◽  
SM Sunny ◽  
K Rai ◽  
AM Hegde
Keyword(s):  
Repeated Exposure ◽  
Microhardness Study ◽  
Surface Microhardness ◽  
Restorative Materials ◽  
Acidic Beverages

scholarly journals To Evaluate the Effect of Water Temperature and Duration of Immersion on the Marginal Accuracy and Microhardness of Provisional Restoration: An In Vitro Study

2020 ◽  
Vol 8 (03) ◽  
pp. 115-126
Author(s):  
Sanjan Verma ◽  
Tarun Kalra ◽  
Manjit Kumar ◽  
Ajay Bansal ◽  
Ritu Batra ◽  
...  
Keyword(s):  
Water Temperature ◽  
In Vitro Study ◽  
Vitro Study ◽  
Marginal Adaptation ◽  
Surface Microhardness ◽  
Effect Of Water ◽  
Fixed Prosthodontics ◽  
Restorative Materials ◽  
Provisional Restoration

Abstract Introduction Provisional restoration is a critical component of fixed prosthodontics treatment, which must satisfy many inter-relative factors such as biological, mechanical, and esthetic. These restorations should have accurate marginal adaptation and optimum strength to maintain functional demands. The present “in vitro” study was conducted to evaluate the effect of water temperature and duration of immersion, on the marginal adaptation and microhardness of four different commercially available provisional restorative materials. Materials and Methods The 240 specimens were then seated on the stainless-steel die which simulated the prepared tooth, and evaluated for the marginal gap for four different provisional restorative materials and divided into four different groups A, B, C, and D. Each group was further divided into six subgroups according to temperature of water and time of immersion. In each group the samples were immersed in water at 20, 30, and 40 degrees, respectively for 5 and 10-minutes duration. Four different temporary restorative materials for crown fabrication were loaded each time to make temporary crowns. Results Each sample was placed under travelling stereoscopic microscope (20× magnification) and photographed. Results for each surface were obtained, and the average of three surfaces was calculated. Knoop hardness was measured using a microhardness tester. The study was subjected to statistical analysis, to know the statistical significance, of the effect of difference in time and temperature changes at the time of final polymerization on surface microhardness and marginal integrity of four different provisional restorative materials. Discussion The mean marginal discrepancies of bis-GMA (group B) at 20, 30, and 40°C for 5 and 10 minutes in water were smaller than the results of other groups. Microhardness evaluation showed that the poly ethyl methacrylate (PEMA) type resin exhibited significantly lower microhardness than the bis-acryl resin composites (Protemp 4 and Systemp.c&b) at both time and temperature intervals. Conclusion The bis-acryl composites material has the least marginal discrepancy in comparison with PEMA and polymethyl methacrylate (PMMA). The bis-acryl composites materials exhibit superior surface microhardness followed by PEMA and PMMA.

A Spectroscopic and Surface Microhardness Study on Enamel Exposed to Beverages Supplemented with Lower Iron Concentrations

2015 ◽  
Vol 39 (2) ◽  
pp. 161-167 ◽  
Author(s):  
AM Xavier ◽  
K Rai ◽  
AM Hegde ◽  
S Shetty
Keyword(s):  
Artificial Saliva ◽  
Permanent Teeth ◽  
Surface Microhardness ◽  
Human Enamel ◽  
Group 2 ◽  
Student’S T ◽  
Acidic Beverages ◽  
Mineral Loss ◽  
Iron Concentrations

Objectives: This study aimed to compare the in vitro mineral loss and surface microhardness (SMH) changes in human enamel specimens following supplementation of acidic carbonated beverages with low iron concentrations than when treated without. Study Design: 180 enamel blocks each from primary and permanent teeth were prepared and equally subdivided (n=10) for their respective treatments in Group 1 (Coca Cola and Sprite without iron supplementation) and Group 2 (beverages supplemented with 2/5mmol/L FeSO4.7H2O). Following initial SMH estimation, the blocks were subjected to 3 treatment cycles of 5/20 minute incubation periods, equally interspaced by a 5-min treatment in artificial saliva. The calcium and phosphate released after each cycle were analyzed spectrophotometrically and the final SMH was recorded. The results were tested using student's T test, One-way ANOVA and Kruskal Walli's test (p<0.05). Results: Two and five mmol/L FeSO4.7H2O supplementation produced a highly significant SMH change and calcium and phosphate reduction than when treated without (p<.0005). Both the enamel specimens showed similar patterns of mineral loss and SMH reduction, with pronounced effects in the twenty minute incubation cycles. Conclusion: Our results suggest that 2mmol/L FeSO4.7H2O supplementation to acidic beverages is beneficial in reducing mineral loss and preserving surface microhardness of human enamel.

Surface microhardness of different restorative materials exposed to candida albicans biofilm isolated from the oral cavity of hiv-infected children

2019 ◽  
Vol 4 (1) ◽  
pp. 87-91
Author(s):  
Leandro COSTA ◽  
Larissa SOARES-SILVA ◽  
Paulini Malfei De C. COSTA ◽  
Adrielle MANGABEIRA ◽  
Maristela PORTELA ◽  
...  
Keyword(s):  
Candida Albicans ◽  
Oral Cavity ◽  
Surface Microhardness ◽  
Restorative Materials

EFFECT OF HUMAN ENAMEL ON WEAR OF THREE TYPES OF INTERIM RESTORATIVE MATERIALS (AN IN-VITRO STUDY)

2017 ◽  
Vol 63 (4) ◽  
pp. 3933-3945
Author(s):  
Khaled Haggag ◽  
Muhammad Abbas ◽  
Zainab EL Sharkawy
Keyword(s):  
In Vitro Study ◽  
Vitro Study ◽  
Human Enamel ◽  
Restorative Materials

In vitro wear of a zirconium-reinforced lithium silicate ceramic against different restorative materials

2019 ◽  
Vol 100 ◽  
pp. 103403
Author(s):  
Larissa Marcia Martins Alves ◽  
Lisseth Patricia Claudio Contreras ◽  
Tiago Moreira Bastos Campos ◽  
Marco Antonio Bottino ◽  
Luiz Felipe Valandro ◽  
...  
Keyword(s):  
Lithium Silicate ◽  
Restorative Materials ◽  
Silicate Ceramic
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