The Journal of Korean Academy of Prosthodontics (대한치과보철학회지)

The Korean Academy of Prosthodonitics (대한치과보철학회)
권호 표지

DIMENSIONAL CHANGE AND FLEXURAL STRENGTH IN COMPLETE DENTURES FABRICATED BY INJECTION MOLDING AND CONVENTIONAL COMPRESSION PROCESSING

의치상용 레진의 전입 방법에 따른 중합체적변화와 굴곡강도에 관한 연구

  • Choi Hoon-Dal (Department of Prosthodontics, College of Dentistry, Kyung-Hee University) ;
  • Kwon Kung-Rock (Department of Prosthodontics, College of Dentistry, Kyung-Hee University) ;
  • Kim Hyeong-Seob (Department of Prosthodontics, College of Dentistry, Kyung-Hee University) ;
  • Choi Dae-Gyun (Department of Prosthodontics, College of Dentistry, Kyung-Hee University)
  • 최훈달 (경희대학교 치과대학 치과보철학교실) ;
  • 권긍록 (경희대학교 치과대학 치과보철학교실) ;
  • 김형섭 (경희대학교 치과대학 치과보철학교실) ;
  • 최대균 (경희대학교 치과대학 치과보철학교실)
  • Published : 2005.08.01
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Abstract

Statement of problem : Fracture and dimensional change of an acrylic resin denture are a rather common occurrence. Purpose : The purpose of this study was to compare differences in dimensional changes and flexural strength of separate maxillary complete dentures after immediate deflasking by injection molding and conventional compression processing. Material and method: To evaluate dimensional stability, the maxillary dentures were fabricated by using different materials and methods. Lucitone 199(Dentsply Trubyte. york, pennsylvania, USA) and Vertex(Dentimex, zeist, Netherlands) were used as materials. Compression and injection packing methods were used as processing methods. The impression surface of the dentures was measured by 3D Scann-ing System(PERCEPTRON USA) and overlapped original impression surface of the master cast. To evaluate flexural strength, resin specimens were made according to the different materials, powder/liquid ratio and processing methods. Flexural strength of the complete resin specimens (64mm$\times$10mm$\times$3.3mm) were measured by INSTRON 4467. (INSTRON, England) The data was analyzed by ANOVA, t-test and Tukey test. (p<.05 level of significance) Result: The results were as follows 1. There was no significant differences between master model and denture base for each group in overall dimensional changes. 2. Palatal area was more stable than flange or alveolar area in dimensional stability. but. there was no significant differences among each area. 3. Materials and power/liquid ratio had an effect on flexural strength. (P<.05) Especially materials was most effective. (P<.05) 4. Lucitone 199(powder/liquid ratio followed by manufacturer's direction) showed higher flexural strength than Vertex. Conclusion : Dimensional stability or flexural strength are affected by materials rather than packing techniques.

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References

  1. Nogueira SS, Ogle RE, Davis EL. Comparison of accuracy between compression- and injection-molded complete dentures. J Prosthet Dent 1999: 82: 291-300 https://doi.org/10.1016/S0022-3913(99)70083-1
  2. John J, Gangadhar SA. Shah I. Flexural strength of heat-polymerized poly methacrylate denture resin reinforced with glass, aramid, or nylon fibers. J Prosthet Dent 2001:86:424-427 https://doi.org/10.1067/mpr.2001.118564
  3. O. Komiyama, M. Kawara. Stress relaxation of heat-activated acrylic denture base resin in the mold after processing. J Prosthet Dent 1998: 79: 175-181 https://doi.org/10.1016/S0022-3913(98)70213-6
  4. Jackson AD, Grisius RJ, Fenster RK. Lang BR. The Dimensional Accuracy of Two Denture Base Processing Methods. lnt J Prosthodont 1989:2:421-428
  5. Keenan PL, Radford DR, Clark RK. Dimensional change in complete dentures fabricated by injection molding and mi-crow ave processing. J Prosthet Dent 2003:89:37-44 https://doi.org/10.1067/mpr.2003.3
  6. Polyzois GL. Improving the adaptation of denture base by anchorage to the casts: a comparative study. Quintessence Int 1990:21: 185-190
  7. Takamata T, Setcos JC, Phillips RW, Boone ME. Adaptation of acrylic resin dentures as influenced by the activation mode of polymerization. J Am Dent Assoc 1989:119:271-276
  8. Consani RL, Domitti SS, Consani S. Effect of a new tension system, used in acrylic resin flasking, on the dimesional stability of denture bases. J Prosthet Dent 2002: 88: 285-289 https://doi.org/10.1067/mpr.2002.128447
  9. Huggett R, Zissis A, Harrison A, Dennis A. Dimensional accuracy and stability of acrylic resin denture bases. J Prosthet Dent 1992: 68: 634-640 https://doi.org/10.1016/0022-3913(92)90379-O
  10. Chitchumnong P, Brooks SC, Stafford GD. Comparison of three-and four-point flexural strength testing of denture-base polymers. Dent Mater 1989:5:2-5 https://doi.org/10.1016/0109-5641(89)90082-1
  11. Memon MS, Yunus N, Razak AAA. Some Mechanical Properties of a Highly CrossLinked. Microwave-polymerized. injection- molded Denture Base Polymer. lnt J Prosthodont 2001; 14:214-218
  12. Ruyter IE, Chern D, Svendsen SA, Real C.Flexural properties of denture base polymers. J Prosthet Dent 1980:43:95-104 https://doi.org/10.1016/0022-3913(80)90362-5
  13. Polyzois GL, Karkazis HC, Zissis AJ, Demetriou PP. Dimensional stability of dentures processed in boilable acrylic resins: A comparative study. J Prosthet Dent 1987; 57: 639-647 https://doi.org/10.1016/0022-3913(87)90351-9
  14. Takahashi Y, Kawaguchi M, Chai J. Flexural Strength at the Proportional Limit of a Denture Base Material Relined With Four Different Denture Reline Materials. lnt J Prosthodont 1997:10:508-512
  15. Haug SP, Duke P, Dixon SE. et al. A pilot clinical evaluation of a new injection denture base system. Compend Contin Educ Dent 2001 :22:847-852, 854