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Assessment of the Quality of Composite Resin restorations

Open Journal of Stomatology 2015年第2期5卷 19-25页

作者： Z. A. Ijaimi N. H. Abu-Bakr Y. E. Ibrahim Conservative Dentistry Division Department of Oral Rehabilitation Faculty of Dentistry University of Khartoum Khartoum Sudan Conservative Dentistry Division Department of Oral Rehabilitation Faculty of Dentistry University of Khartoum Khartoum Sudan Department Clinical Dental Science College of Dentistry Princess Nourah Bint Abdelrahman University Riyadh KSA

Purpose: To evaluate the quality of the composite restorations. Material and Methods: A total of 246 composite restorations in 125 patients attending the Conservative Dentistry Clinics at the Faculty of Dentistry, University of Khartoum were examined. Both anterior and posterior composite restorations were included. California Dental Association Quality Evaluation System was used for the evaluation. Results: Fifty two percent of all restorations were found to be satisfactory, while the remaining 48% were not satisfactory. With regard to surface and colour criteria, colour mismatch within the range (34.8%) and slight surface roughness (26.6%) were the most common defects. The most frequent defects of the anatomical form were restoration overhang (26.8%). The majority of the restorations above 4 years old were of unacceptable anatomical form (66.7%), and their marginal integrity was less acceptable than more recent restorations (46.7%). Conclusions: Forty eight percent of the examined composite restorations needed to be replaced, and the unacceptable anatomic form was the main cause of failure of composite restorations.

关键词： Composite Resin restorations Marginal Defect Overhang Restoration Colour Mismatch

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Deep Time Reconstructions of Internal Earth Structure with the Adjoint Method

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Acta Geologica Sinica(English Edition) 2019年第S1期93卷 3-4页

作者： Hans-Peter BUNGE Lorenzo COLLI Siavash GHELICHKHAN Jens OESER Department of Geosciences Ludwig-Maximilians UniversityD-80333 MumnichTheresienstrasse 41 Department of Earth and Atmospheric Sciences University of Houston

The adjoint method is a powerful tool to obtain gradient information in a computational model relative to unknown model parameters,allowing one to solve inverse problems where analytical solutions are not available or... 详细信息

关键词： adjoint method inverse problems paleo mantle convection flow restorations dynamic topography

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An <i>in vitro</i>study of antimicrobial agents incorporated into interim restorative materials

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Open Journal of Stomatology 2013年第1期3卷 94-98页

作者： Arely Denisse Garza Garza Violet I. Haraszthy Jane D. Brewer Edward Monaco Jennifer Kuracina Joseph J. Zambon Department of Periodontics and Endodontics University at Buffalo School of Dental Medicine Buffalo USA Department of Restorative Dentistry University at Buffalo School of Dental Medicine Buffalo USA

Aim: To test the hypothesis that antimicrobial agents can be incorporated into bis-acryl resin and that the material will inhibit bacterial growth in vitro. Materials and Methods: 0.5%, 1% and 2% triclosan (5-chloro-2-(2,4-dichlorophenoxy)phenol) and 0.05% 0.01% and 0.15% cetylpyridinium chloride were incorporated into bis-acryl resins and molded into 1 mm × 10 mm discs. The discs were placed on bacterial culture media inoculated with Aggregatibacter actinomycetemcomitans strain Y4, Porphyromonas gingivalis strain SUNYaB A7A1-28 or Streptococcus gordonii strain 10558, incubated and examined for growth inhibition. Results: Triclosan-containing bisacryl resin discs produced dose-dependent zones of growth inhibition for A. actinomycetemcomitans but not S. gordonii or P. gingivalis. Cetylpyridinium chloride-containing discs produced dose-dependent zones of growth inhibition for Porphyromonas gingivalis and Streptococcus gordonii but not A. actinomycetemcomitans. Conclusion: Triclosan and cetylpyridinium chloride can be incorporated into bis-acryl resin and can inhibit the growth of plaque bacteria in a dose dependent manner. Bis-acryl resin containing antimicrobial agents may inhibit in vivo plaque accumulation and gingival inflammation.

关键词： Interim restorations Bis-Acryl Resin Triclosan Cetylpyridinium Chloride

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