The Journal of Korean Academy of Prosthodontics (대한치과보철학회지)

The Korean Academy of Prosthodonitics (대한치과보철학회)
권호 표지

FRACTURE TOUGHNESS OF SELF-CURING DENTURE BASE RESINS WITH DIFFERENT POLYMERIZING CONDITIONS

의치상용 자가중합레진의 중합조건에 따른 파괴인성

  • Jeong Soo-Yang (Department of Prosthodontics and Institute of Oral Bio Science, College of Dentistry, Chonbuk National University) ;
  • Kim Ji-Hye (Department of Prosthodontics and Institute of Oral Bio Science, College of Dentistry, Chonbuk National University) ;
  • Yang Byung-Deok (Department of Prosthodontics and Institute of Oral Bio Science, College of Dentistry, Chonbuk National University) ;
  • Park Ju-Mi (Department of Prosthodontics and Institute of Oral Bio Science, College of Dentistry, Chonbuk National University) ;
  • Song Kwang-Yeob (Department of Prosthodontics and Institute of Oral Bio Science, College of Dentistry, Chonbuk National University)
  • 정수양 (전북대학교 치과대학 치과보철학교실 및 구강생체과학연구소) ;
  • 김지혜 (전북대학교 치과대학 치과보철학교실 및 구강생체과학연구소) ;
  • 양병덕 (전북대학교 치과대학 치과보철학교실 및 구강생체과학연구소) ;
  • 박주미 (전북대학교 치과대학 치과보철학교실 및 구강생체과학연구소) ;
  • 송광엽 (전북대학교 치과대학 치과보철학교실 및 구강생체과학연구소)
  • Published : 2005.02.01
Download PDF
⟨ Previous Next ⟩

Abstract

Purpose. The intent of this study was to evaluate the effects of curing conditions on self-curing denture base resins to find out proper condition in self-curing resin polymerization. Materials and methods, In this study, 3 commercial self-curing denture base resins are used Vertex SC, Tokuso Rebase and Jet Denture Repair Acrylic. After mixing the self curing resin, it was placed in a stainless steel mold(3$\times$6$\times$60mm). The mold containing the resin was placed under the following conditions: in air at 23$^{\circ}C$; or in water at 23$^{\circ}C$; or in water at 23$^{\circ}C$ under pressure(20psi); or in water at 37$^{\circ}C$ under pressure(20psi) or in water at 50$^{\circ}C$ under pressure(20psi) , or in water at 65$^{\circ}C$ under pressure(20psi), respectively. Also heat-curing denture base resin is polymerized according to manufactures' instructions as control. Fracture toughness was measured by a single edge notched beam(SENB) method. Notch about 3mm deep was carved at the center of the long axis of the specimen using a dental diamond disk driven by a dental micro engine. The flexural test was carried out at a crosshead speed 0.5mm/min and fracture surface were observed under measuring microscope. Results and conclusion . The results obtained were summarized as follows : 1. The fracture toughness value of self-curing denture base resins were relatively lower than that of heat-curing denture base resin. 2. In Vertex SC and Jet Denture Repair Acrylic, higher fracture toughness value was observed in the curing environment with pressure but in Tokuso Rebase, low fracture toughness value was observed but there was no statistical difference. 3. Higher fracture toughness value was observed in the curing environment with water than air but there was no statistical difference. 4. Raising the temperature in water showed the increase of fracture toughness.

Keywords

References

  1. Kim KN, Kim KH, Kim HI, Park YJ, Bae TS, Lim HN, Cho HW : Dental Materials. 1st Edition, Koonja Publishing, Inc p159-90, 1995
  2. Vallittu PK, Ruyter IE, Buykuilmaz S. Effect of polymerization temperature and time on the residual monomer content of denture base polymers. Eur J Oral Sci 1998;106:588-93 https://doi.org/10.1046/j.0909-8836.1998.eos106109.x
  3. Donovan TE, Hurst RG, Campagni WV. Physical properties of acrylic resin polymerized by four different techniques. J Prosthet Dent 1985;54:522-4 https://doi.org/10.1016/0022-3913(85)90425-1
  4. Fletcher AM, Purnaveja S, Amin WM, Ritchie GM, Moradians S, Dodd AW. The level of residual monomer in self-curing denture-base materials. J Dent Res 1983;62:118-20 https://doi.org/10.1177/00220345830620020601
  5. Stipho HD. Effect of glass fiber rein-forcement on some mechanical properties of autopolymerizing polymethyl methacrylate. J Prosthet Dent 1998;79:580-4 https://doi.org/10.1016/S0022-3913(98)70180-5
  6. Chee WW, Donovan TE, Daftary F, Siu TM. The effect of vacuum-mixed autopoly-merizing acrylic resins on porosity and transverse strength. J Prosthet Dent 1988;60:517-9 https://doi.org/10.1016/0022-3913(88)90261-2
  7. Ogawa T, Tanaka M, Koyano K. Effect of water temperature during polymerization on strength of autopolymerizing resin. J Prosthet Dent 2000;84:222-4 https://doi.org/10.1067/mpr.2000.108574
  8. Fletcher AM, Purnaveja S, Amin WM, Ritchie GM, Moradians S, Dodd AW. The level of residual monomer in self-curing denture-base materials. J Dent Res 1983;62:118-20 https://doi.org/10.1177/00220345830620020601
  9. Sadamori S, Ganefiyanti T, Hamada T, Arima T. Influence of thickness and location on the residual monomer content of denture base cured by three processing methods. J Prosthet Dent 1994;72:19-22 https://doi.org/10.1016/0022-3913(94)90210-0
  10. Ruyter IE, Oysaed H. Conversion in denture base polymers. J Biomed Mater Res 1982;16:741-54 https://doi.org/10.1002/jbm.820160520
  11. Sadamori S, Kotani H, Hamada T. The usage period of dentures and their residual monomer contents. J Prosthet Dent 1992;68:374-6 https://doi.org/10.1016/0022-3913(92)90349-F
  12. Lee SY, Lai YL, Hsu TS. Influence of polymerization conditions on monomer elution and microhardness of autopoly-merized polymethyl methacrylate resin. Eur J Oral Sci 2002;110:179-83 https://doi.org/10.1034/j.1600-0722.2002.11232.x
  13. Dogan A, Bek B, Cevik NN, Usanmaz A. The effect of preparation conditions of acrylic denture base materials on the level of residual monomer, mechanical properties and water absorption. J Dent 1995;23:313-8 https://doi.org/10.1016/0300-5712(94)00002-W
  14. Furnish GM, O' Toole TJ, von Fraunhofer JA. The polymerization of acrylic resin orthodontic prostheses. J Prosthet Dent 1983;49:276-8 https://doi.org/10.1016/0022-3913(83)90515-2
  15. Gegauff AG, Pryor HG. Fracture toughness of provisional resins for fixed prosthodontics. J Prosthet Dent 1987:;58:23-9 https://doi.org/10.1016/S0022-3913(87)80137-3
  16. Keh ES, Hayakawa I. Takahashi H, Watanabe A, Iwasaki Y, Akiyoshi K, Nakabayashi N. Improving a self-curing dental resin by eliminating oxygen, hydroquinone and water from its curing process. Dent Mater J 2002;21:373-82 https://doi.org/10.4012/dmj.21.373
  17. Vallittu PK. Unpolymerized surface layer of autopolymerizing polymethyl methacrylate resin. Oral Rehabil 1999;26:208-12 https://doi.org/10.1046/j.1365-2842.1999.00360.x