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. 2012 Aug;4(Suppl 2):S197-202.
doi: 10.4103/0975-7406.100200.

Fracture resistance of teeth restored with cast post and core: An in vitro study

S Mankar  1 , N S Mohan Kumar, J V Karunakaran, S Senthil Kumar
Affiliations

Fracture resistance of teeth restored with cast post and core: An in vitro study

S Mankar et al. J Pharm Bioallied Sci. 2012 Aug.

Abstract

Context: Influence of luting agent, design of tooth preparation for cast posts on tooth resistance to fracture.

Aim: To evaluate fracture resistance of teeth restored with cast posts and cores with or without cervical ferrule and cemented with zinc phosphate, glass ionomer, or resin cement.

Materials and methods: Sixty single-rooted maxillary first premolars of similar sizes were selected. Biomechanical preparation and post space preparation for cast post was done for all samples and then they were divided into two groups (n=30). Cervical ferrule preparation was done for Group A, and Group B was prepared without any cervical ferrule. Both groups were further divided into three subgroups (1, 2, and 3; n=10) Cast posts for subgroups 1, 2, and 3 were cemented with zinc phosphate, glass ionomer, and resin cement, respectively. A shearing load was applied to indented buccal cusp of specimens at an angle of 45° in universal testing machine at a cross-head speed of 1 mm/min until fracture.

Results: Specimens with ferrule (Group A) had significantly higher shear bond strength values (mean 1503.37 N) than specimens without ferrule (Group B) (mean 1052.09 N).

Conclusion: Inclusion of ferrule in tooth preparations for posts increased the fracture resistance regardless of the luting agent.

Keywords: Cast posts and cores; ferrule; fracture resistance.

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Conflict of interest statement

Conflict of Interest: None declared.

Figures

Figure 1
Figure 1
Teeth placed in square cylinders & filled with chemical cured resin
Figure 2
Figure 2
Diagrammatic representation of two restoration design tested
Figure 3
Figure 3
Diagrammatic representation of restoration and root embedded in acrylic resin in iron cubicle cylinders, and direction of load applied
Figure 4
Figure 4
Specimen on placing the load using universal testing machine
Figure 5
Figure 5
Universal testing machine
Graph 1
Graph 1
Comparison between ferruled and nonferruled groups
Graph 2
Graph 2
Mean shear strength recorded in the groups
See this image and copyright information in PMC

References

    1. Shillingburg HT, Hobo S, Whitsett LD, Jacobi R, Brackett SE. Fundamentals of Fixed Prosthodontics. 3rd ed. Chicago: Quintessence; 1998.
    1. Caputo AA, Standlee JP. Restoration of endodontically involved teeth. In: Caputo AA, Standlee JP, editors. Biomechanics in Clinical Dentistry. Chicago: Quintessence; 1987. pp. 185–203.
    1. Johnson J, Schwartz N, Blackwell R. Evaluation and restoration of endodontically treated posterior teeth. J Am Dent Assoc. 1976;93:597–605. - PubMed
    1. Perel M, Muroff F. Clinical criteria for post and cores. J Prosthet Dent. 1972;28:405–11. - PubMed
    1. Sorensen JA, Engelman MJ. Ferrule design and fracture resistance of endodontically treated teeth. J Prosthet Dent. 1990;63:529–36. - PubMed