The University of Osaka · Dentistry
Professor Mikako Hayashi's research lab specializes in operative dentistry and dental biomaterials, with a strong focus on the clinical performance, longevity, and biocompatibility of dental restorations. Her work centers on evaluating the long-term outcomes of ceramic inlays, composite restorations, and resin cements, particularly in relation to marginal integrity, wear, post-operative sensitivity, and bond strength. The lab also investigates clinical teaching methodologies in dentistry, especially the education of posterior composite restorations in undergraduate dental programs in Japan.
Figures are computed from collected data and may differ slightly.
The purpose of the present study was to evaluate the quality of fired ceramic inlay restorations consisting of a feldspathic porcelain system (G-Cera Cosmotech II) after 6 years in vivo. A total of 49 fired ceramic inlays (for 27 premolars and 22 molars: class 1 in 11 teeth, class 2 in 36 teeth, and onlays in two teeth) were placed in 29 patients, and all restorations were evaluated at the time of placement, at 6 months, and 1, 2, 4, and 6 years after placement using modified USPHS criteria. Rep
The influence of endodontic irrigation on shear bond strengths of resin cement to radicular dentin was investigated. Human radicular dentin blocks were divided into four groups and subjected to one of four endodontic irrigations: ethylenediaminetetraacetic acid (EDTA) group, 17% EDTA for 60 s; EDTA/sodium hypochlorite (NaOCl) group, 17% EDTA for 60 s followed by 10 ml of 5% NaOCl for 15 s; NaOCl group, 10 ml of 5% NaOCl for 15 s; and control group, no treatment. Morphological changes of dentin s
The purpose of the present study was to undertake a retrospective analysis of the findings of a multicentre clinical trial to test the hypothesis that marginal deterioration and cavomarginal discoloration may be a predictor of the failure of posterior composite restorations. Longitudinal 5-yr data from the multicentre trial of Occlusin were analysed (modified USPHS criteria data were available in respect of 1018 of the 1242 restorations included in the study). The 5-yr failure rate was calculate
Post-operative sensitivity (POS) may be observed in recently placed posterior composites. Evidence-based guidelines for the management of posterior composites with POS have yet to be determined. This study examined a retrospective analysis of the findings of a unique multi-center clinical trial to investigate the five-year risk of failure of posterior composites with POS and to determine the factors likely to have an important impact on the prognosis of the restorations. Longitudinal five-year d
The teaching of posterior composites has undergone considerable refinement and development in western countries in recent years. However, little information exists on this teaching in other parts of the world. The aim of this paper is to investigate the teaching of posterior composites to undergraduate dental students in Japan. In late 2007/early 2008, a questionnaire seeking information on the teaching of posterior composites was distributed by email to the person responsible for teaching opera
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