Ichiro Shimamura

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PURPOSE The All-on-4 is used in the therapy of edentulous mandibles. However, few studies have investigated the effect of such implants on supporting bone. To clarify differences in stress in peri-implant cortical bone between 2-patterns of 6 implants and 8-patterns of 4 implants with change in inclination angle based on the All-on-4. METHODS(More)
The aim of this study was to observe the influence of prosthesis design and loading condition on the stress distributions of tooth-implant supported prostheses. Six 2D finite element models, two reference models, and four experimental models were computed to simulate different prosthesis designs. Six different loading conditions were applied to investigate(More)
PURPOSE Preserved human amniotic membrane has been used in reconstruction of the ocular surface. In this paper, we report our method of amniotic membrane transplantation (AMT) for recurrent pterygium. METHODS Twenty-six eyes of 26 patients with recurrent pterygium are reported. All subjects were operated on with an extensive excision of the(More)
OBJECTIVES The aim of this study was to document the usefulness of the endoscopic endonasal approach as a surgical treatment of isolated blowout fractures of the orbital floor. STUDY DESIGN Retrospective study. SETTING Between 1997 and 2003, using only an endonasal endoscopic surgical approach, we operated on 62 patients complaining of diplopia due to(More)
PURPOSE The purpose of this study was to evaluate the effect of differences in the retainer design on load on abutment teeth and displacement of the denture base in mandibular unilateral extension base partial removable dental prosthesis to determine the optimum design for a mechanically appropriate retainer. METHODS Three models were used. Each(More)
Deleterious effects of isopropyl unoprostone (PG-F2 alpha) on the ocular surface were evaluated using the in vivo barrier function assay of corneal epithelial cells and the proliferation assay of human corneal epithelial cells in vitro. The barrier function of corneal epithelial cells in vivo was not impaired by treatment with PGF2 alpha, but it was(More)
PURPOSE To identify buccal design criteria for retainer on polyamide resin removable partial dentures. METHODS A left upper distal extension model was used for this study. Undercut was given on the buccal side of first and second premolars. Four different retainer designs were created. Undercuts of 0.5 and 0.75 mm were used. All 4 retainer designs started(More)
The objective of this report was to review 365 cases of Brånemark Implant Bridge including 1,444 fixtures in patients of Tokyo Dental College Chiba Hospital. The term of implantation was divided into several phases; less than 1 year, from 1 year to 3 years, from 3 years to 5 years, from 5 years to 7 years, from 7 years to 10 years, more than 10 years, and(More)
PURPOSE The purpose of this study was to develop design criteria for palatal straps according to palatal shape. METHODS The palatal shapes of 60 dentate maxillary stone casts were measured using a contact-type three-dimensional measuring instrument. Based on the average of the 60 palatal shapes, 5 three-dimensional finite element models (FE models) were(More)