Advertisement

Effect of thickness of cavity wall on fracture strength of pulpotomized primary molar teeth with class II amalgam restorations

  • F. MazhariEmail author
  • M. Gharaghahi
Research
  • 58 Downloads

Summary

Aim: This was to evaluate the effect of different thicknesses of cavity walls on fracture strength of pulpotomized primary molar teeth with class II amalgam restorations. Methods: 80 carious extracted human primary molar teeth were selected for pulpotomy preparation. The teeth were divided into four groups. Mesio- or disto-occlusal (20 teeth) and mesio-occluso-distal (20 teeth); cavities were prepared in both first and second primary molar teeth. Each group was divided into two subgroups of ten teeth according to the thickness of their walls (1.5 or 2.5 mm). After restoring teeth with amalgam, all groups were stored in distilled water at 37°C for seven days. They were then thermo cycled 1,000 times between 5° to 55°C. The specimens were then subjected to a compressive axial load in a universal testing machine at a crosshead speed of 0.5 mm min−1. The t-test was used for statistical analysis. Results: Mean fracture resistances of the first and second molar teeth were 975.5 ± 368.8 and 1049.2 ± 540.1, respectively. In the first molars, fracture resistance of 2-surface cavities was significantly more than 3-surface cavities (p=0.001), but this difference was not statistically significant in second molars. In second molars, fracture strength in 2- and 3-surface cavities with a 2.5 mm thickness in the walls was more than those with 1.5 mm thickness. However, in first molars this difference was only statistically significant in 3-surface cavities (p=0.045). Conclusions: The fracture strength in pulpotomized primary molar teeth with amalgam restorations was high, more than maximum bite forces in primary teeth, even in extensive 3-surface cavities.

Key words

cavity wall thickness fracture strength p ulpotomized primary molar teeth amalgam restoration 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Assif D, Gorfil C. Biomechanical considerations in restoring endodontically treated teeth. J Prosthet Dent. 1994;71(6):565–7.PubMedCrossRefGoogle Scholar
  2. Bakke M, Holm B, Jensen BL, Michler L, Moller E. Unilateral, isometric bite force in 8–68-year-old women and men related to occlusal factors. Scand J Dent Res. 1990; 98(2):149–58.PubMedGoogle Scholar
  3. Blaser PK, Lund MR, Cochran MA, Potter RH. Effect of designs of class 2 preparations on resistance of teeth to fracture. Oper Dent.1983;8(1):6–10.PubMedGoogle Scholar
  4. Carlsson G.E.: Bite force and chewing efficiency; in Kawamura Y. (ed): Frontiers in Oral physiology 1. Physiology of Mastication. Basel. Karger, 1979, pp 265–292.Google Scholar
  5. Caron GA, Murchison DF, Cohen RB, Broome JC. Resistance to fracture of teeth with various preparations for amalgam. J Dent.1996;24(6):407–10.PubMedCrossRefGoogle Scholar
  6. El-Sherif MH, Halhoul MN, Kamar AA, Hourel-Din A, Fracture strength of premolars with class 2 silver amalgam restorations. Oper Dent 1988;13:50–3PubMedGoogle Scholar
  7. Fields HW, Proffit WR, Case JC, Vig KW. Variables affecting measurements of vertical occlusal force. J Dent Res. 1986;65(2):135–8.PubMedCrossRefGoogle Scholar
  8. Gorucu J, Ozgunaltay G. Fracture resistance of teeth with class II bonded amalgam and new tooth-colored restorations. Oper Dent. 2003;28(5):501–7.PubMedGoogle Scholar
  9. Hansen EK, Asmussen E, Christiansen NC. In vivo fractures of endodontically treated posterior teeth restored with amalgam. Endod Dent Traumatol. 1990;6(2):49–55.PubMedCrossRefGoogle Scholar
  10. Johnson JK, Schwartz NL, Blackwell RT. Evaluation and restoration of endodontically treated posterior teeth: A Review. J Am Dent Assoc. 1976;93(3):597–605.PubMedGoogle Scholar
  11. Kamegai T, Tatsuki T, Nagano H, et al. A determination of bite force in northern Japanese children. Eur J Orthod. 2005;27(1):53–7.PubMedCrossRefGoogle Scholar
  12. Kiliaridis S, Johansson A, Haraldson T, Omar R, Carlsson GE. Craniofacial morphology, occlusal traits and bite force in persons with advanced occlusal tooth wear. Am J Orthod Dentofacial Orthop. 1995;107(3):286–92.PubMedCrossRefGoogle Scholar
  13. Linn J, Messer HH. Effect of restorative procedures on the strength of endodontically treated molars. J Endod. 1994;20(10):479–85.PubMedCrossRefGoogle Scholar
  14. Maki K, Nishioka T, Morimoto A, Naito M, Kimura M. A study on the measurement of occlusal force and masticatory efficiency in school age Japanese Children. Int J Paediatr Dent. 2001;11(4):281–5.PubMedCrossRefGoogle Scholar
  15. Mondelli J, Steagall L, Ishikiriama A, et al. Fracture strength of human teeth with cavity preparations. J Prosthet Dent. 1980;43(4):419–22.PubMedCrossRefGoogle Scholar
  16. Ortega VL, Pegoraro LF, Conti PC, do Valle AL, Bonfante G. Evaluation of fracture resistance of endodontically treated maxillary premolars, restored with ceromer or heat-pressed ceramic inlays and fixed with dual-resin cements. J Oral Rahabil. 2004;31(4):393–7.CrossRefGoogle Scholar
  17. Panitvisai P, Messer HH. Cuspal deflection in molars in relation to endodontic and restorative procedures. J Endod.1995;21(2):57–61.PubMedCrossRefGoogle Scholar
  18. Pilo R, Brosh T, Chweidan H. Cusp reinforcement by bonding of amalgam restorations. J Dent. 1998;26(5–6):467–72.PubMedCrossRefGoogle Scholar
  19. Reeh ES, Messer HH, Douglas WH. Reduction in tooth stiffness as a result of endodontic and restorative procedures. J Endod. 1989;15(11):512–6.PubMedCrossRefGoogle Scholar
  20. Rentes AM, Gaviao MB, Amaral JR. Bite force determination in children with primary dentition. J Oral Rehabil. 2002;29(12):1174–80.PubMedCrossRefGoogle Scholar
  21. Waggoner, W.F.: Restorative dentistry for the primary dentition; in Pinkham, JR. (ed): Pediatric Dentistry. Infancy through adolescence.4th Ed, Philadelphia, W.B. Saunders Co; 2005. pp. 348.Google Scholar

Copyright information

© European Academy of Paediatric Dentistry 2008

Authors and Affiliations

  1. 1.Depts. Paediatric Dentistry, Faculty of DentistryMashhad University of Medical SciencesMashhadIran
  2. 2.Depts. EndodonticsMashhad University of Medical SciencesMashhadIran

Personalised recommendations