J Adv Prosthodont.  2013 Aug;5(3):241-247. 10.4047/jap.2013.5.3.241.

Influence of various metal oxides on mechanical and physical properties of heat-cured polymethyl methacrylate denture base resins

Affiliations
  • 1Department of Comprehensive Dentistry, Dental School, University of Texas Health Science Center at San Antonio, Texas, USA. nvolkan@gazi.edu.tr
  • 2Private Practice, Sakarya, Turkey.
  • 3Department of Prosthodontics, Dental School, Gazi University, Ankara, Turkey.
  • 4Implant Clinic, Department of Comprehensive Dentistry, University of Texas Health Science Center at San Antonio, Texas, USA.

Abstract

PURPOSE
To evaluate the effect of various metal oxides on impact strength (IS), fracture toughness (FT), water sorption (WSP) and solubility (WSL) of heat-cured acrylic resin.
MATERIALS AND METHODS
Fifty acrylic resin specimens were fabricated for each test and divided into five groups. Group 1 was the control group and Group 2, 3, 4 and 5 (test groups) included a mixture of 1% TiO2 and 1% ZrO2, 2% Al2O3, 2% TiO2, and 2% ZrO2 by volume, respectively. Rectangular unnotched specimens (50 mm x 6.0 mm x 4.0 mm) were fabricated and droptower impact testing machine was used to determine IS. For FT, compact test specimens were fabricated and tests were done with a universal testing machine with a cross-head speed of 5 mm/min. For WSP and WSL, discshaped specimens were fabricated and tests were performed in accordance to ISO 1567. ANOVA and Kruskal-Wallis tests were used for statistical analyses.
RESULTS
IS and FT values were significantly higher and WSP and WSL values were significantly lower in test groups than in control group (P<.05). Group 5 had significantly higher IS and FT values and significantly lower WSP values than other groups (P<.05) and provided 40% and 30% increase in IS and FT, respectively, compared to control group. Significantly lower WSL values were detected for Group 2 and 5 (P<.05).
CONCLUSION
Modification of heat-cured acrylic resin with metal oxides, especially with ZrO2, may be useful in preventing denture fractures and undesirable physical changes resulting from oral fluids clinically.

Keyword

Polymer; Metal-oxide; Reinforcement; Water sorption and solubility

MeSH Terms

Collodion
Denture Bases
Dentures
Oxides
Polymers
Polymethyl Methacrylate
Reinforcement (Psychology)
Solubility
Water
Collodion
Oxides
Polymers
Polymethyl Methacrylate
Water

Figure

  • Fig. 1 Three types of acrylic resin specimens used in this study. (A) Test specimen for fracture toughness, (B) Test specimen for impact strength, (C) Test specimen for water sorption and solubility.

  • Fig. 2 Compact test specimen used for fracture toughness testing. (w = 12 mm, b = 4 mm, a = 2.4 mm) (Reprinted from Materials & Design, Yilmaz C, Korkmaz T, The reinforcement effect of nano and microfillers on fracture toughness of two provisional resin materials, 28(7): 2063-70, 2007, with permission from Elsevier).

  • Fig. 3 Precrack formation of a specimen before fracture toughness testing. (Reprinted from Materials & Design, Yilmaz C, Korkmaz T, The reinforcement effect of nano and microfillers on fracture toughness of two provisional resin materials, 28(7), 2063-70, 2007, with permission from Elsevier).


Cited by  1 articles

Effects of incorporation of 2.5 and 5 wt% TiO2 nanotubes on fracture toughness, flexural strength, and microhardness of denture base poly methyl methacrylate (PMMA)
Sahar Abdulrazzaq Naji, Marjan Behroozibakhsh, Tahereh Sadat Jafarzadeh Kashi, Hossein Eslami, Reza Masaeli, Hosseinali Mahgoli, Mohammadreza Tahriri, Mehrsima Ghavvami Lahiji, Vahid Rakhshan
J Adv Prosthodont. 2018;10(2):113-121.    doi: 10.4047/jap.2018.10.2.113.


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