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Amalgam Restoration

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Saeed Asgary – 1st expert on this subject based on the ideXlab platform

  • Mineral trioxide aggregate versus formocresol pulpotomy: a systematic review and meta-analysis of randomized clinical trials
    Clinical Oral Investigations, 2014
    Co-Authors: Armin Shirvani, Saeed Asgary


    Objectives This study systematically reviewed randomized clinical trials (RCTs) investigating the effectiveness of primary molar pulpotomies with mineral trioxide aggregate (MTA) and formocresol. The study also aimed to assess the possible association of reported prognostic factors on the success rate and relative risk using meta-regression analysis. Materials and methods A comprehensive literature search using Medline, EMBASE, and Cochrane Central databases up to March 2013 was conducted. After scoring and data extraction of qualified trials ( n  = 19, representing 1,585 patients), meta-analyses were performed using Mantel–Haenszel model and inverse variance-weighted method. Results The results revealed that MTA is more effective than formocresol in primary molars pulpotomy, resulting in a lower failure rate with a relative risk of 0.26 (CI, 0.13–0.49), 0.37 (CI, 0.19–0.70), and 0.41 (CI, 0.25–0.68) for 6-, 12-, and 24-month follow-ups (test for statistical heterogeneity: p  = 0.99, p  = 0.98, and p  = 0.23), respectively. Compared to Amalgam Restoration, success rate was significantly greater with SS crown ( P  

M.p. Huang – 2nd expert on this subject based on the ideXlab platform

  • The influence of simultaneous mechanical and thermal loads on the stress distribution in molars with Amalgam Restorations
    Journal of Materials Science: Materials in Medicine, 2000
    Co-Authors: Dwayne Arola, M.p. Huang


    A finite element analysis (FEA) of a mandibular molar restored with Class II Amalgam Restoration was conducted to determine the stress distribution which results from a superposition of simultaneous mechanical and thermal loading. A fully crossed three-level four-factor experimental design was used to evaluate the relative influence of crown temperature, time of thermal loading, occlusal force, and cavo-surface margin adhesion on the stress distribution. It was found that occlusal force and temperature had significant influence on the stress distribution and particularly on the maximum principal stress. Over the range in oral conditions considered, thermal loading contributed for over 35% of the stress within the restored molar subjected to simultaneous mechanical and thermal loads. Furthermore, thermal loading had significant effects on the magnitude of normal stress that develops parallel to the pulpal floor. Although marginal bonding of Amalgam reduces the stress resulting from occlusal forces, thermal loading promotes the development of significant interfacial shear stresses along the bonded margin. Stresses related to the thermal component of loading concentrate near the pulpal floor and lingual surface margin, the site most prominent in cusp fracture. Hence, results from this study clearly indicate that an evaluation of new dental materials and/or restorative designs should consider the effects from a superposition of simultaneous mechanical and thermal loads on fracture resistance ©©2000©Kluwer Academic Publishers

Avijit Banerjee – 3rd expert on this subject based on the ideXlab platform

  • Atraumatic restorative treatment versus Amalgam Restoration longevity: a systematic review
    Clinical Oral Investigations, 2010
    Co-Authors: Steffen Mickenautsch, Veerasamy Yengopal, Avijit Banerjee


    The aim was to report on the longevity of Restorations placed using the atraumatic restorative treatment (ART) approach compared with that of equivalent placed Amalgam Restorations. Five databases were systematically searched for articles up to 16 March 2009. Inclusion criteria: (1) titles/abstracts relevant to the topic; (2) published in English; (3) reporting on 2-arm longitudinal in vivo trials; (4) minimum follow-up period of 12 months. Exclusion criteria: (1) insufficient random or quasi-random allocation of study subjects; (2) not all entered subjects accounted for at trial conclusion; (3) subjects of both groups not followed up in the same way. Fourteen from the initial search of 164 articles complied with these criteria and were selected for review. From these, seven were rejected and seven articles reporting on 27 separate datasets, accepted. Only identified homogeneous datasets were combined for meta-analysis. From the 27 separate computable dichotomous datasets, four yielded a statistically significant improvement of longevity of ART versus Amalgam Restorations: posterior class V, 28% over 6.3 years; posterior class I, 6% after 2.3 years and 9% after 4.3 years; posterior class II, 61% after 2.3 years. Studies investigating Restorations placed in the primary dentition showed no significant differences between the groups after 12 and 24 months. In the permanent dentition, the longevity of ART Restorations is equal to or greater than that of equivalent Amalgam Restorations for up to 6.3 years and is site-dependent. No difference was observed in primary teeth. More trials are needed in order to confirm these results.