Flexual strength of resins for provisional fixed prostheses

임시 고정성 보철물 제작용 레진의 굽힘강도

  • Choi, Myoung-Ah (Department of Prosthetic Dentistry, Institute of Oral Bioscience, School of Dentistry, Chonbuk National University) ;
  • Ahn, Seung-Geun (Department of Prosthetic Dentistry, Institute of Oral Bioscience, School of Dentistry, Chonbuk National University) ;
  • Cho, Kuk-Hyeon (Department of Prosthetic Dentistry, Institute of Oral Bioscience, School of Dentistry, Chonbuk National University)
  • 최명아 (전북대학교 치과대학 치과보철학교실 및 구강생체과학연구소) ;
  • 안승근 (전북대학교 치과대학 치과보철학교실 및 구강생체과학연구소) ;
  • 조국현 (전북대학교 치과대학 치과보철학교실 및 구강생체과학연구소)
  • Published : 2000.09.30

Abstract

Provisional fixed partial dentures(FPDs) are an important part of many prosthodontic treatment procedures. These provisional fixed prostheses must fulfill biologic, mechanical, and esthetic requirements to be considered successful. Consideration of all these factors and requirements are important because provisional resin restorations may be worn over a long period to assess the results of periodontal and endodontics therapies, and also during the restorative phase of implant reconstructive procedures. This in vitro study examined flexual strength of four resins commonly used for fixed provisional prostheses. The effects of polymerization conditions were also evaluated. The four resins tested were : Caulk Temporary bridge resin(L.D. Caulk Co. Dentsply International Millford), Jet(Lang Dental Mfg. Co. Chicago. ILL. U.S.A), Alike (Coe Laboratories. Inc. Chicago. ILL. U.S.A) and Tokuso Curefast (Coe Laboratories. Inc. Chicago. ILL. U.S.A) The test specimens were 65mm long, 14mm wide, and 3.5mm thickness. 10 specimens of four resins were cured for 15 minutes at atmospheric pressure and 10 specimens of four resins were cured at an additional pressure of approximately 20 psi. A total of 80 specimens were prepared. The flexual strength was determined by three-point bending test. Data were analysed with the Paired samples T-test and Tukey student-range test Within the limitations imposed in this study, the following conclusions can be drawn : 1. Under the condition of bench curing, Caulk Temporary bridge resin showed the highest flexual strength. In decreasing order, the flexual strength of the other materials was as follows : Jet, Tokuso Curefast, Alike, and Caulk Temporary bridge resin demonstrated significantly higher strength than other resins. 2. Under the condition of pressure curing, Jet showed the highest flexual strength. In decreasing order, the flexual strength of the other materials was as follows : Caulk Temporary bridge resin, Tokuso Curefast, and Alike. There were all statistically significant differences among four resins 3. There was a statistically significant difference between bench- and pressure-cured specimens in all four materials.