EVALUATION OF A NEWLY FORMULATED AUTOPOLYMERIZED ACRYLIC RESIN PERMANENT DENTURE BASE MATERIAL (In Vitro Study)
Mohamed, N., Abdelhamid, A., El Shabrawy, S. (2019). EVALUATION OF A NEWLY FORMULATED AUTOPOLYMERIZED ACRYLIC RESIN PERMANENT DENTURE BASE MATERIAL (In Vitro Study). EKB Journal Management System, 44(1), 103-110. doi: 10.21608/adjalexu.2019.57613
Najat A. Mohamed; Ahmed M. Abdelhamid; Sonia M. El Shabrawy. "EVALUATION OF A NEWLY FORMULATED AUTOPOLYMERIZED ACRYLIC RESIN PERMANENT DENTURE BASE MATERIAL (In Vitro Study)". EKB Journal Management System, 44, 1, 2019, 103-110. doi: 10.21608/adjalexu.2019.57613
Mohamed, N., Abdelhamid, A., El Shabrawy, S. (2019). 'EVALUATION OF A NEWLY FORMULATED AUTOPOLYMERIZED ACRYLIC RESIN PERMANENT DENTURE BASE MATERIAL (In Vitro Study)', EKB Journal Management System, 44(1), pp. 103-110. doi: 10.21608/adjalexu.2019.57613
Mohamed, N., Abdelhamid, A., El Shabrawy, S. EVALUATION OF A NEWLY FORMULATED AUTOPOLYMERIZED ACRYLIC RESIN PERMANENT DENTURE BASE MATERIAL (In Vitro Study). EKB Journal Management System, 2019; 44(1): 103-110. doi: 10.21608/adjalexu.2019.57613

EVALUATION OF A NEWLY FORMULATED AUTOPOLYMERIZED ACRYLIC RESIN PERMANENT DENTURE BASE MATERIAL (In Vitro Study)

Alexandria Dental Journal
Article 18, Volume 44, Issue 1, April 2019, Page 103-110  XML PDF (301.4 K)
Document Type: Original Article
DOI: 10.21608/adjalexu.2019.57613
View on SCiNiTO View on SCiNiTO
Authors
Najat A. Mohamed* 1; Ahmed M. Abdelhamid2; Sonia M. El Shabrawy3
1BDS and Demonstrator, Removable Prosthodontics Department, Faculty of Dentistry, Benghazi University, Libya.
2Professor of Prosthodontics, Faculty of Dentistry, Alexandria University, Egypt.
3Professor and Head of Biomaterial, Faculty of Dentistry, Alexandria University, Egypt.
Abstract
INTRODUCTION: Auto-polymerizing acrylic resin with pour technique provides an alternative method to conventional compressionmolding processing for denture base resin. This technique offered improved adaptation, dimensional stability, reduced cost and simplicity of procedure. OBJECTIVES: To investigate some of the physico-mechanical properties of a newly formulated auto-polymerized pour resin permanent denture base material and compare them with conventional heat cured resin. MATERIALS AND METHODS: The study was conducted on two parallel groups according to the denture base material used Group (I) conventional heat cured resin (control group), Group (II) newly formulated auto-polymerized pour resin (study group) of 35 specimens each (14 for impact strength test, 14 for flexural strength test, 7 for warpage test and grinded powder from the cured material for estimation of residual monomer test). Will be examined in this in vitro study. Each group was divided into 2 subgroups: (A) Zero-thermo-cycling (no thermocycling) and (B) Thermo-cycling, then subjected to 4 different tests, impact strength, flexural strength, warpage and quantitative analysis for estimation of residual monomer test. All data from both groups in this in-vitro study was gathered, tabulated and statistically analyzed. RESULTS: The results showed that denture bases processed from auto-polymerized pour resin exhibit high adaptation (low warpage) comparable to those heat cured, and this adaptation significantly increased after thermo-cycling, on other hand, results revealed significantly high amounts of residual monomer of pour resin in both condition (before & after thermo-cycling) in comparison with heat cured resin with significant reduction in these levels after thermo-cycling for both materials. While the impact strength of pour resin was significantly lower than heat cured with no significant increase of flexural strength. CONCLUSIONS: Auto-polymerized pour resin exhibit high adaptation accuracy which is related to the investing medium & technique of processing. On the other hand, containing high amount of residual monomer affecting the physico-mechanical properties. Generally, thermalcycling improve the mechanical and bio-compatibility of the material.
Keywords
Auto-polymerized; pour resin technique; impact strength; flexural strength; warpage; Residual monomer
References
  1. The Academy of Prosthodontics. The glossary of prosthodontic terms. J Prosthet Dent. 2005; 94:10–92.
  2. Jorge, JH, Giampaolo, ET, Vergani, C.E, Machado, A.L, Pavarina, A.C and Carlos IZ. Biocompatibility of denture base acrylic resins evaluated in culture of L929 cells. Effect of polymerisation cycle and post‐polymerisation treatments. Gerodontology, 2007;24 :52-7
  3. Lee SY, Lai YI, Hsu TS. The influence of polymerizing conditions on the monomer elution and micro hardness of auto-polymerizing poly methyl methacrylate resin. Eur J Oral Sci.2002; 110:179-83.
  4. Teraoka F, Takahashi J. Controlled polymerization system for fabricating precise dentures. J Prosthet Dent.2000; 83:514–20.
  5. Takamata T, Setcos JC. Resin denture bases: review of accuracy and methods of polymerization. Int J Prosthodont. 1989; 2:555–62.
  6. Gulati HS. New era in denture base resins. A review. Dent J Adv Stud 2013; 1:136-43.
  7. Shepard WL. Denture bases processed from a fluid resin. J Prosthet Dent.1968; 19:561–72.
  8. Tandon R, Gupta S, Agarwal S. Denture base materials: from past to future. Indian J Dent Sci 2010;2:33-9
  9. Winkler S. Denture base resins. Dent Clin North Am 1984; 28:287-97.
  10. Silva C de S, Machado AL, Chaves C de AL, Pavarina AC, Vergani CE. Effect of thermal cycling on denture base and autopolymerizing resins. J Appl Oral Sci. 2013; 21:219-24.
  11. ISO 179-2:1997, Plastics – Determination of Charpy impact properties – Part 2: Instrumented impact test, ISO/TC 61/SC 2nd. Switzerland: International Standards Organization, 2010.
  12. Rossomando KJ, Wendt SL. Thermocycling and dwell times in microleakage evaluation for bonded restorations. Dent Mater 1995; 11:47-51.
  13. Abdulwahhab SS. High-impact strength acrylic denture base material processed by autoclave. J prosthodont Res. 2013; 57:288-93.
  14. Revised American Dental Association Specification no.12 for denture base polymers. J Am Dent Assoc 1975; 90:451- 8.
  15. Singh S, Hussain AZ, Thombare RM, Motwan BK, Mangalekar SB. An in vitro study to evaluate the effects of various polymerizing conditions on the flexural strength of autopolymerizing resins.J Health Sci Res 2017; 8:15-9.
  16. Al-Ameer SS. The influence of different pH of saliva and thermal cycling on the adaptation of different denture base materials. J Bagh College Dentistry 2012; 24:47-53.
  17. Salahuddin N, Shehata M. Polymethylmethacrylate– montmorillonite composites: preparation, characterization and properties. Polymer. 2001; 42:8379-85.
  18. Al-Ali AA, Sheet OA, Taqa AA. The effect of different curing techniques on the degree of bond conversion for different types of acrylic resin materials. Al-Rafidain Dent J.2013; 13:351-7.
  19. Urban V M, Machado A L, Vergani C E, Jorge É G, Santos LPSD, Leite ER, et al. Degree of conversion and molecular weight of one denture base and three reline resins submitted to post-polymerization treatments. Mat Res.2007; 10:191- 97.
  20. Kirkpatrick LA, Feeney BC. A simple guide to IBM SPSS statistics for version 20.0. Student ed. Belmont, Calif, Australia: Wadsworth, Wadsworth Cengage; 2013.
  21. Macedo VC, Cotes C, Cabrini RR, Paes-Junior TJA, Carvalho RF and Kimpara ET. Influence of Polymerization Technique and Resin Type in Denture Misfit. J Dent App. 2014; 1: 124-26.
  22. Matsuo H, Suenaga H, Takahashi M, Suzuki O, Saski K, Takahashi N. Deterioration of poly methyl methacrylate denture in oral cavity. Dent Mater J.2015; 34:324-9.
  23. Craig R. Prosthetic appliance of polymers. Restorative dental materials.11th ed. St Louis; Mosby; 2002. P 570-1.
  24. Abou Daya MH, Shaaban SA, El-Darwich I, Hanafy AH. A comparative laboratory and electron microscopic study of important physico-mechanical properties of “pour-type and conventional denture base material. PhD Thesis. Biomaterial Department, Faculty of Dentistry, Alexandria University. Egypt.1990.
  25. Wady AF, Machado Al, Vergani CE, Pavarina AC, Giampaolo ET. Impact strength of denture base and reline acrylic resins subjected to long-term water immersion. Braz Dent J 2001; 22:56-61.
  26. Seo RS, Murata H, Hong G, Vergani CE, Hamada T. Influence of thermal and mechanical stresses on the strength of intact and relined denture bases. J prosthet dent. 2006;96:59-67
  27. Machado AL, Puckett AD, Breeding LC, Wady AF, Vergani CE. Effect of thermocycling on the flexural and impact strength of urethane based and high impact denture base resin. Gerodontology. 2012; 29:318-23.
  28. O'Brien WJ. Dental Materials and Their Selection. 4th ed. Chicago: Quintessence Publishing Co, Inc; 2008. P75-91. 
  29. Mumcu E, Cilingir a, Gencel B, Sulun T. Flexural properties of a light-cure and a self-cure denture base materials compared to conventional alternatives. J advance Prosthodont.2011; 3:136-39. 
  30. Takahashi Y, Hamanaka I, Shimizu H. Flexural properties of denture base resins subjected to long-term water immersion. Acta Odontol Scand 2012; 71:716-20.
  31. 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; 119:271-6.
  32. Al-Taie GA. Influence of heating rates and residual monomer on dimensional changes of acrylic resin denture base. MJD.2008; 5:393-96.
  33. Winkler S, Ortman HR, Morris HF, Plzia RA. Processing changes in complete dentures constructed from pour resin. JADA 1971; 82:349-53.
  34. Duymus ZY, Yanikoglu ND. The investigation of solubility values, water sorption and bond strength of autopolymerizing and heat polymerizing acrylic resin materials. Eur J Prosthodont Restor Dent. 2006; 14:116-20.
  35. Frangou M, Hugget R, Stafford GD. Evaluation of the properties of new pour denture base material utilizing a modified technique and initiator system. J Oral Rehabil 1990; 7:67-77.
  36. Al-Alooni SRA, Fatah NA. Tooth movement in maxillary complete dentures fabricated with fluid resin polymer using different investment materials. J Baghdad Cool Dent 2012; 24:18-22.
  37. WallyZ.H, Al khafagy MT, Al Musawi R.M. The effect of different curing time on impact strength of cold cure and hot cure acrylic resin denture base material. MJB 2014; 11:188- 94.
  38. Abdelhamid A, Ashour M, Yehia MA, Mohamed SA. Oral Response to a Newly Formulated Autopolymerized Complete Denture Base Material (Microbiological and Cytological Study). IJSR 2016; 5:1534-42.
  39. Vallitu 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; 106:588-593.
  40. Milena K, Nebojsa K, Ljubisa N, Vesna N, Stevo N, Ivan K, et al. The influence of residual monomer reduction in quality of resin materials stomatoprotetshik. Hem Ind 2011; 65:171-7.
Statistics
Article View: 786
PDF Download: 2,862