Journal of Dental Sciences
Volume 5, Issue 2 , Pages 90-99, June 2010

Multifactorial analysis of variables influencing the fracture strength of repair joints for provisional restorative materials using the statistically based Taguchi method

  • Chun-Jen Cheng

      Affiliations

    • Department of Prosthodontics, Dental Section, Lin-Kou Medical Center, Chang Gung Memorial Hospital, Linkou, Taoyuan, Taiwan
    • Graduate Institute of Craniofacial and Dental Science, Chang Gung University, Taoyuan, Taiwan
    • ,
  • Chun-Li Lin

      Affiliations

    • Department of Mechanical Engineering, Graduate Institute of Medical Mechatronics, Chang Gung University, Taoyuan, Taiwan
    • ,
  • Yu-Fu Shan

      Affiliations

    • Department of Prosthodontics, Dental Section, Lin-Kou Medical Center, Chang Gung Memorial Hospital, Linkou, Taoyuan, Taiwan
    • Corresponding Author InformationCorresponding author. Department of Prosthodontics, Dental Section, Lin-Kou Medical Center, Chang Gung Memorial Hospital, 5 Fu-Shing Street, Kwei-Shan, Taoyuan 33305, Taiwan

Received 13 February 2010; accepted 10 May 2010.

Article Outline

Background/purpose

In this study, we investigated the relative contributions of design factors to the fracture strength of provisional materials after repair.

Materials and methods

The Taguchi method was used to investigate the optimal design with respect to four different design factors: subject material, repair material, repair design, and connector thickness. Each factor was assigned three levels. Using the Taguchi L9 orthogonal array, nine rectangular bar-shaped experimental specimens with different parameter combinations were fabricated (n= 5) and tested with a three-point bending test. The fracture load (in newtons) of each specimen group was recorded. The Taguchi method was employed to identify the significance of each design factor in controlling the fracture strength. The sensitivity of each design parameter was determined using an analysis of variance. Fractographic analysis was performed to identify the adhesive or cohesive failure mode for each specimen.

Results

The mean effect of the design factors at each level was determined. The subject material, with a contribution percentage of as high as 33.48%, had the most dominant effect on the fracture strength of the repaired provisional restorations, followed by the repair material (31.88%), connector thickness (19.70%), and joint design (14.94%). The strongest subject material was bis-acryl Protemp 3 Garant. The polymethyl methacry late material, Tempron, was the preferred repair material. A 4-mm connector thickness was the best level. A 45º bevel joint was superior to the butt or fiber joint. The predicted fracture strength of the optimum parameter combination (Protemp 3 Garant/45º bevel joint/Tempron/4 mm connector thickness) was 173.34 N. From the fractographic analysis, different bonding abilities between the same and different resin materials were investigated. Fiber joint groups were nearly all in the cohesive mode without complete catastrophic fracture.

Conclusion

Within the limitations of this study, these four design factors had different contributions to the fracture strength of repaired provisional restorations. Clinicians must be aware of the sequence of importance in determining better problem-solving methods.

Key Words:  bis-acryl composite , polymethyl methacrylate , provisional restorative material , repair joint design , Taguchi method

No full text is available. To read the body of this article, please view the PDF online.

 

Back to Article Outline

References 

  1. Rosenstiel SF , Land MF , Fujimoto J . In: Contemporary Fixed Prosthodontics . 4th ed.. Missouri: Mosby; 2006;p. 466–504
  2. Haselton DR , Diaz-Arnold AM , Vargas MA . Flexural strength of provisional crown and fixed partial denture resins . J Prosthet Dent . 2002;87:225–228
  3. Burns DR , Beck DA , Nelson SK , Committee on Research in Fixed Prosthodontics of the Academy of Fixed Prosthodontics  . A review of selected dental literature on contemporary provisional fixed prosthodontic treatment: report of the Committee on Research in Fixed Prosthodontics of the Academy of Fixed Prosthodontics . J Prosthet Dent . 2003;90:474–497
  4. Christensen GJ . Provisional restorations for fixed prostho-dontics . J Am Dent Assoc . 1996;127:249–251
  5. Duke ES . Provisional restorative materials: a technology update . Compend Contin Educ Dent . 1999;20:497–500
  6. Shillingburg HT , Hobo S , Whitsett LD , Jacobi R , Brackett SE . In: Fundamentals of Fixed Prosthodontics . 3rd ed.. Chicago: Quintessence; 1997;p. 225–256
  7. Nagai E , Otani K , Satoh Y , Suzuki S . Repair of denture base resin using woven metal and glass fiber: effect of methylene chloride pretreatment . J Prosthet Dent . 2001;85:496–500
  8. Hazelton LR , Nicholls JI , Brudvik JS , Daly CH . Influence of reinforcement design on the loss of marginal seal of provisional fixed partial dentures . Int J Prosthodont . 1995;8:572–579
  9. Anusavice KJ . In: Phillips' Science of Dental Materials . 10th ed.. Philadelphia: WB Saunders; 1996;p. 285–431
  10. Young HM , Smith CT , Morton D . Comparative in vitro evaluation of two provisional restorative materials . J Prosthet Dent . 2001;85:129–132
  11. Tjan AH , Castelnuovo J , Shiotsu G . Marginal fidelity of crowns fabricated from six proprietary provisional materials . J Prosthet Dent . 1997;77:482–485
  12. Wang RL , Moore BK , Goodacre CJ , Swartz ML , Andres CJ . A comparison of resins for fabricating provisional fixed restorations . Int J Prosthodont . 1989;2:173–184
  13. Koumjian JH , Nimmo A . Evaluation of fracture resistance of resins used for provisional restorations . J Prosthet Dent . 1990;64:654–657
  14. Robinson FB , Hovijitra S . Marginal fit of direct temporary crowns . J Prosthet Dent . 1982;47:390–392
  15. Monday JJ , Blais D . Marginal adaptation of provisional acrylic resin crowns . J Prosthet Dent . 1985;54:194–197
  16. Palomo F , Peden J . Periodontal considerations of restorative procedures . J Prosthet Dent . 1976;36:387–394
  17. Grajower R , Shaharbani S , Kaufman E . Temperature rise in pulp chamber during fabrication of temporary self-curing resin crowns . J Prosthet Dent . 1979;41:535–540
  18. Crispin BJ , Watson JF , Caputo AA . The marginal accuracy of treatment restorations: a comparative analysis . J Prosthet Dent . 1980;44:283–290
  19. Ireland MF , Dixon DL , Breeding LC , Ramp MH . In vitro mechanical property comparison of four resins used for fabrication of provisional fixed restorations . J Prosthet Dent . 1998;80:158–162
  20. Osman YI , Owen CP . Flexural strength of provisional restorative materials . J Prosthet Dent . 1993;70:94–96
  21. Gegauff AG , Pryor HG . Fracture toughness of provisional resins for fixed prosthodontics . J Prosthet Dent . 1987;58:23–29
  22. Diaz-Arnold AM , Dunne JT , Jones AH . Micro-hardness of provisional fixed prosthodontic materials . J Prosthet Dent . 1999;82:525–528
  23. O'Brien WJ . In: Dental Materials and Their Selection . 3rd ed.. Canada: Quintessence; 2002;p. 339–390
  24. Vahidi F . The provisional restoration . Dent Clin North Am . 1987;31:363–381
  25. Wood M , Halpern BG , Lamb MF . Visible light-cured composite resins: an alternative for anterior provisional restorations . J Prosthet Dent . 1984;51:192–194
  26. Solow RA . Composite veneered acrylic resin provisional restorations for complete veneer crowns . J Prosthet Dent . 1999;82:515–517
  27. Bohnenkamp DM , Garcia LT . Repair of bis-acryl provisional restorations using flowable composite resin . J Prosthet Dent . 2004;92:500–502
  28. Beyli MS , von Fraunhofer JA . Repair of fractured acrylic resin . J Prosthet Dent . 1980;44:497–503
  29. Harrison WM , Stansbury BE . The effect of joint surface contours on the transverse strength of repaired acrylic resin . J Prosthet Dent . 1970;23:464–474
  30. Ward JE , Moon PC , Levine RA , Behrendt CL . Effect of repaired surface design, repair material, and processing method on the transverse strength of repaired acrylic denture resin . J Prosthet Dent . 1992;67:815–820
  31. Amin AE . The effect of poly-aramide fiber reinforcement on the transverse strength of a provisional crown and bridge resin . Egypt Dent J . 1995;41:1299–1304
  32. Larson WR , Dixon DL , Aquilino SA , Clancy JM . The effect of carbon graphite fiber reinforcement on the strength of provisional crown and fixed partial denture resins . J Prosthet Dent . 1991;66:816–820
  33. Geerts Greta AVM , Overturf JH , Oberholzer TG . The effect of different reinforcements on the fracture toughness of materials for interim restorations . J Prosthet Dent . 2008;99:461–467
  34. Mullarky RH . Aramid fiber reinforcement of acrylic appliances . J Clin Orthod . 1985;19:655–658
  35. Pfeiffer P , Grube L . In vitro resistance of reinforced interim fixed partial dentures . J Prosthet Dent . 2003;89:170–174
  36. Samadzadeh A , Kugel G , Hurley E , Aboushala A . Fracture strengths of provisional restorations reinforced with plasma-treated woven polyethylene fiber . J Prosthet Dent . 1997;78:447–450
  37. El-Ebrashi MK . Experimental stress analysis of dental restorations, VII: structure design and stress analysis of fixed partial dentures . J Prosthet Dent . 1970;23:177–186
  38. Raigrodski AJ . Contemporary all-ceramic fixed partial dentures: a review . Dent Clin North Am . 2004;48:531–544
  39. Miller LL . Framework design in ceramo-metal restorations . Dent Clin North Am . 1977;21:699–716
  40. Mclean JW . Bridge design and laboratory procedures in dental ceramics . In: The Science and Art of Dental Ceramics . Volume 2: Chicago: Quintessence; 1982;
  41. Sorensen JA , Curz M , Mito WT , Raffeiner O , Meredith HR , Foser HP . A clinical investigation on three-unit fixed partial dentures fabricated with a lithium disilicate glass-ceramic . Pract Periodent Aesthet Dent . 1998;11:95–106
  42. Raigrodski AJ , Salzer AM . Clinical considerations in case selection for all-ceramic fixed partial dentures . Pract Proced Aesthet Dent . 2002;14:411–419
  43. Mclaren EA , White SN . Glass-infiltrated zirconia/alumina-based ceramic for crowns and fixed partial dentures: clinical and laboratory guidelines . Quintessence Dent Technol . 2000;23:63–76
  44. Dar FH , Meakin JR , Aspden RM . Statistical methods in finite element analysis . J Biomech . 2002;35:1155–1161
  45. Lee WCC , Zhang M . Design of monolimb using finite element modeling and statistics-based Taguchi method . Clin Biomech (Bristol, Avon) . 2005;20:759–766
  46. Phadke MS . Quality Engineering Using Robust Design . New Jersey: Prentice Hall; 1989;
  47. Lin CL , Chang SH , Chang WJ , Kuo YC . Factorial analysis of variables influencing mechanical characteristics of a single tooth implant placed in the maxilla using finite element analysis and the statistics-based Taguchi method . Eur J Oral Sci . 2007;115:408–416
  48. Wei YH , Lai CC , Chang JS . Using Taguchi experimental design methods to optimize trace element composition for enhanced surfactin production by Bacillus subtilis ATCC 21332 . Process Biochem . 2007;42:40–45
  49. Jeney C , Dobay O , Lengyel A , Adam E , Nasz I . Taguchi optimization of ELISA procedures . J Immunol Methods . 1999;223:137–146
  50. Protemp 3 Garant temporization material technical product profile, 3M ESPE, Germany . Available at: http://www.3m.com/intl/kr/medi/medi5/pdf/protemp3garant.pdf

PII: S1991-7902(10)60013-X

doi:10.1016/S1991-7902(10)60013-X

Journal of Dental Sciences
Volume 5, Issue 2 , Pages 90-99, June 2010

Article Tools