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  Zanco J Med Sci:  Dec. 2017; 21 (3): 1818-1828

The effect of addition of barium sulphate nanoparticles on some properties of Acetal resin

Kaify Wali Ahmed *, Rizgar Mohammed Ameen Hasan *

* Department of Prosthodontics, College of Dentistry, Hawler Medical University, Erbil, Iraq.


Background and objective: Acetal resin or polyoxymethylene is a flexible thermoplastic radiolucent denture base material. This study aimed to evaluate the addition of barium sulfate BaSO4 nanoparticles on the mechanical and physical properties of acetal resin. 

Methods: Forty two specimens were prepared from both non-modified and modified acetal resin. The tested specimens were obtained by melt extrusion into the mold equipment followed by injection molding. The radio-opacity of non-modified and modified evaluated, and then some mechanical and physical properties tested.

Results: The results of radio-opacity test showed that the radiographic density of BaSO4 3% Acetal resin specimens was at the same level of 2mm thickness of the aluminum stepwedge. Non-significant decrease noted in surface roughness, creep in all strain regions, and compressive strength and modulus of elasticity.

Conclusion: It has been concluded that the addition of 3% BaSO4 nanoparticles produced an acceptable radio-opaque Acetal resin denture base material. Although the addition caused some changes in properties, the modified Acetal resin remained as a flexible thermoplastic material.

Keywords: Thermoplastic; BaSO4nanoparticles; Acetal resin; Radio-opaque.



1. Lekha K, Savitha NP, Meshramkar R, Ramesh KN. Acetalresin as an esthetic clasp material. J Interdisciplinary Dentistry 2012; 2(1):11-4.

2. Fitton JS, Davies EH, Howlett JA, Pearson GJ. The physical properties of a polyacetal denture resin. J Clin Mater 1995; 17:125-9.

3. Turner JW, Radford DR, Sherriff M. Flexural properties and surface finishing of acetal resin denture clasps. J Prosthodont 1999; 8:188-95.

4. Phoenix RD, Mansueto MA, Ackerman NA, Jones RE. Evaluation of mechanical and thermal properties of commonly used denture base resins. J Prosthodont 2004; 13:17-27.

5. Mattie PA, Rawls HR, Cabasso I. Development of a radio-opaque auto polymerizing dental acrylic resin. J Prosthodontic 1994; 3:213-8.

6. Combe EC. Further studies on radio-opaque denture base materials. J dent1972; 1:93-7.

7. Romero-Ibarra IC, Bonilla-Blancas E, Sánchez-Solís A, Manero O. Influence of X-ray opaque BaSo4 nanoparticles on mechanical, thermal and rheological properties of polyoxymethylene nano composites. J Polymer Engeneer 2012; 32:319-26.

8. Beaumont AJ. An overview of esthetics with removable partial dentures. Quintessence Int 2002; 33(10):747-55.

9. Donovan TE, Cho GC. Esthetic considerations with removable partial dentures. J Calif Dent Assoc 2003; 31(7):551-7.

10. Kutsch VK, Whitehouse JW, Schermerhorn K. The evolution and advancement of dental thermoplastics. J DentalTown 2003;4(2):52-6.

11. Hareri GI. Surface finish improvement in metal hard turning and burnishing operation. Ph.D. Thesis. University of Salahaddin, College of Engineering. Iraq; 2005.

12. Hasan RM. The effect of addition of radiopaque materials on some mechanical and physical properties of flexible denture base. Ph.D Thesis. Hawler Medical University. College of Dentistry. Iraq; 2009.

13. Soratur SH. Essentials of dental materials. 1st ed. New Delhi, India: Jaypee; 2002. P. 69.

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