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うきえすすむ
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1 Clinical Factors which Affect the Shortend Life Span of Abutment Teeth in Removable Partial Denture Mitsuhiro Yoshida Abstract: In order to establish diagnostic parameters for the estimation of prognosis of abutment teeth in removable partial denture, the degree of tooth quality must be determined. Clinical factors which affect the shortened life span of abutment teeth in removable partial denture were investigated by use of statistical analysis, biomechanically and histopathologically. Subjects included patients requiring extraction of abutment teeth, were divided into two groups of vital and nonvital teeth. Data was collected based on clinical examinations assigned to three categories such as periodontal condition factor, occlusion factor and prosthesis factor. The following results were observed in the nonvital group: biomechanical factors such as occlusal and prosthesis factors were shown to be significant risk factors in which affected the shortend life span of RPD abutment teeth by statistical analysis, tooth quality was weakened, and bacterial contamination within enamel of root canal surfaces was observed by electromicroscopy. In contrast, vital group factor contribution to poor prognosis included periodontal condition such as pocket depth and CPITN, which proved to be a significant risk factor. Key words: RPD, life span, abutment teeth, statistics, risk factors, histopathology Iwate Medical Univ., Graduate School, Major in Prosthodontics (Director: Prof. Hisatoshi Tanaka)

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14 1) Sumney, D. L., Jordan, H. V. and Englander, H. R.: The prevalence of root surface caries in selected populations, J Periodontol, 44: 500 `504, ) Banting, D. W., Ellen, R. P. and Fillery, E. D.: Prevalence of root surface caries among institutionalized older persons, Community Dent Oral Epidemiol, 8: 84 Am Dent Assoc, 44: 288 `295, ) Koivumaa, K. K., Hedegard, B. and Carlsson, G. E.: Studies in partial dental prosthesis I. An investigation of dentogingivally supported partial dentures, Finska Tandl-Sallsk Forh, 56: 248 `306, ) Carlsson, G. E., Hedegird, B. and Koivumaa, K. K.: Studies in partial dental prosthesis II. An investigation of mandibular partial dentures with double exten- sion saddles, Acta Odontol Scand, 19: 215 `237, ) Carlsson, G. E., Hedegard, B. and Koivumaa, K. K.: Studies in partial dental prosthesis III. A longitudinal study of mandibular partial dentures with double extension saddles, Acta Odontol Scand, 20: 95 `119, ) Messerman, T.: A concept of jaw function with a 88, ) Nelsen, R. J., Wolcott, R. B. and Paffenbarger, G. C.: Fluid exchange at the margins of dental restorations, J `

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Microflora in Patients Treated with Fixed Prosthetic Appliances Supragingival Plaque Formed on the Full Cast Crown - Fabricated with Platinum Gold Cas

Microflora in Patients Treated with Fixed Prosthetic Appliances Supragingival Plaque Formed on the Full Cast Crown - Fabricated with Platinum Gold Cast Alloy- Junichi Mega, Yosizumi Murata, Masatomo Hirasawa*