Effect of Ferrule Thickness on Fracture Resistance of Teeth Restored With a Glass Fiber Post or Cast Post

Author:

Fontana PE1,Bohrer TC2,Wandscher VF3,Valandro LF4,Limberger IF5,Kaizer OB6

Affiliation:

1. Patrícia Eliana Fontana, MSD, DDS graduate student in Oral Sciences (Prosthodontics), Faculty of Odontology, Federal University of Santa Maria, Santa Maria, Brazil

2. Thaís Camponogara Bohrer, MSD, DDS graduate student in Oral Sciences (Prosthodontics), MSD, Faculty of Odontology, Federal University of Santa Maria, Santa Maria, Brazil

3. Vinícius Felipe Wandscher, MSD, PhD, adjunct professor, Faculty of Odontology, Franciscan University (Prosthodontics Unit), Santa Maria, Brazil

4. Luiz Felipe Valandro, MSD, PhD, associate professor, MDS Graduate Program in Oral Science (Prosthodontics-Biomaterials Units), Faculty of Odontology, Federal University of Santa Maria, Santa Maria, Brazil

5. Inácio F Limberger, PhD, associate professor, Faculty of Mechanical Engineering, Federal University of Santa Maria, Santa Maria, Brazil

6. Osvaldo Bazzan Kaizer, MSD, PhD, adjunct professor, MDS Graduate Program in Oral Science (Prosthodontics Units), Faculty of Odontology, Federal University of Santa Maria, Santa Maria, Brazil

Abstract

SUMMARY Purpose: To investigate the influence of ferrule thickness on fracture resistance after mechanical cycling of teeth restored with different intracanal posts. Methods and Materials: One hundred twenty bovine incisor teeth were randomized into six study groups, based on the intracanal post used (fiber post or cast post and core) and the presence and thickness of a ferrule (without ferrule, presence of 0.5-mm or 1-mm-thick ferrule, retaining unaltered 2-mm ferrule height). The root posts and the metal crowns were cemented using an adhesive cement. The samples were subjected to mechanical cycling (at 37°C, 45°, 130 N, 2.2 Hz, and 2 × 106 pulses). Afterward, they were subjected to a fracture load test at a speed of 0.5 mm/min and on a 45° slope until failure occurred. The failures were classified as favorable or unfavorable. The fracture resistance data were analyzed with two-way analysis of variance and Tukey test. The chi-square test was used to analyze the pattern of failure. Results: When considering the cast post and core, the 1-mm ferrule thickness group presented a higher resistance to fracture than did the group in which a ferrule was not used (p=0.001). When using a glass fiber post, the groups showed no differences in fracture resistance. Overall, 96.7% of the specimens survived the mechanical cycling. Of the fractures, 58.6% of the fractures were unfavorable, while 41.6% were favorable. Conclusions: A thicker ferrule statistically increased the fracture resistance only for cast post and core when it was at least 1 mm thick, despite causing more unfavorable failures. Thus, ferrule thickness should be considered when choosing different intracanal posts, to reduce the occurrence of unfavorable failures. In the absence of a ferrule, the use of a cast post and core presents more favorable failures, and in the presence of a 1-mm-thick ferrule, the use of a glass fiber post seems to be the best clinical decision.

Publisher

Operative Dentistry

Subject

General Dentistry

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