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Survival rate and fracture strength of endodontically treated maxillary incisors with moderate defects restored with different post-and-core systems: an in vitro study.
Int J Prosthodont. 2001 Jan-Feb; 14(1):58-64.IJ

Abstract

PURPOSE

This study compares the survival rate and fracture strength of endodontically treated maxillary incisors with moderate coronal defects restored with different post-and-core systems after exposure to an artificial mouth.

MATERIALS AND METHODS

Sixty-four caries-free human maxillary central incisors were selected for standardized size and quality, endodontically treated, and decoronated 2 mm coronal to the cementoenamel junction. Group 1 was restored with titanium posts and composite cores, group 2 received zirconia posts and a composite core, and in group 3 zirconia posts with a heat-pressed ceramic core were used. Teeth restored with cast posts and cores served as controls. All teeth were prepared and restored with complete cast crowns. All samples were exposed to 1.2 million cycles in a computer-controlled chewing simulator with simultaneous thermocycling. In addition, the samples were loaded until fracture in a static testing device.

RESULTS

The survival rates of the different groups were: 94% for titanium/composite, 63% for zirconia/composite, 100% for the all-ceramic post and core, and 94% for the cast post and core. The following mean fracture strengths were obtained: titanium/composite = 425 +/- 155 N, zirconia/composite = 202 +/- 212 N, zirconia/ceramic = 378 +/- 64 N, cast post and core = 426 +/- 178 N. The lower fracture load in the group with zirconia posts and composite cores was statistically significant. The use of zirconia posts resulted in fewer oblique root fractures.

CONCLUSION

Prefabricated titanium posts with composite cores, zirconia posts with heat-pressed ceramic cores, and cast posts and cores yield comparable survival rates and fracture strengths for the restoration of crowned maxillary incisors with moderate coronal defects. Survival rates and fracture strengths for zirconia posts with composite cores are significantly lower, so this combination cannot be recommended for clinical use.

Authors+Show Affiliations

Department of Prosthodontics, School of Dentistry, Albert Ludwigs University, Freiburg, Germany. butz@zmk2.ukl.uni-freiburg.deNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Clinical Trial
Comparative Study
Journal Article
Randomized Controlled Trial

Language

eng

PubMed ID

11842907

Citation

Butz, F, et al. "Survival Rate and Fracture Strength of Endodontically Treated Maxillary Incisors With Moderate Defects Restored With Different Post-and-core Systems: an in Vitro Study." The International Journal of Prosthodontics, vol. 14, no. 1, 2001, pp. 58-64.
Butz F, Lennon AM, Heydecke G, et al. Survival rate and fracture strength of endodontically treated maxillary incisors with moderate defects restored with different post-and-core systems: an in vitro study. Int J Prosthodont. 2001;14(1):58-64.
Butz, F., Lennon, A. M., Heydecke, G., & Strub, J. R. (2001). Survival rate and fracture strength of endodontically treated maxillary incisors with moderate defects restored with different post-and-core systems: an in vitro study. The International Journal of Prosthodontics, 14(1), 58-64.
Butz F, et al. Survival Rate and Fracture Strength of Endodontically Treated Maxillary Incisors With Moderate Defects Restored With Different Post-and-core Systems: an in Vitro Study. Int J Prosthodont. 2001 Jan-Feb;14(1):58-64. PubMed PMID: 11842907.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Survival rate and fracture strength of endodontically treated maxillary incisors with moderate defects restored with different post-and-core systems: an in vitro study. AU - Butz,F, AU - Lennon,A M, AU - Heydecke,G, AU - Strub,J R, PY - 2002/2/15/pubmed PY - 2002/3/8/medline PY - 2002/2/15/entrez SP - 58 EP - 64 JF - The International journal of prosthodontics JO - Int J Prosthodont VL - 14 IS - 1 N2 - PURPOSE: This study compares the survival rate and fracture strength of endodontically treated maxillary incisors with moderate coronal defects restored with different post-and-core systems after exposure to an artificial mouth. MATERIALS AND METHODS: Sixty-four caries-free human maxillary central incisors were selected for standardized size and quality, endodontically treated, and decoronated 2 mm coronal to the cementoenamel junction. Group 1 was restored with titanium posts and composite cores, group 2 received zirconia posts and a composite core, and in group 3 zirconia posts with a heat-pressed ceramic core were used. Teeth restored with cast posts and cores served as controls. All teeth were prepared and restored with complete cast crowns. All samples were exposed to 1.2 million cycles in a computer-controlled chewing simulator with simultaneous thermocycling. In addition, the samples were loaded until fracture in a static testing device. RESULTS: The survival rates of the different groups were: 94% for titanium/composite, 63% for zirconia/composite, 100% for the all-ceramic post and core, and 94% for the cast post and core. The following mean fracture strengths were obtained: titanium/composite = 425 +/- 155 N, zirconia/composite = 202 +/- 212 N, zirconia/ceramic = 378 +/- 64 N, cast post and core = 426 +/- 178 N. The lower fracture load in the group with zirconia posts and composite cores was statistically significant. The use of zirconia posts resulted in fewer oblique root fractures. CONCLUSION: Prefabricated titanium posts with composite cores, zirconia posts with heat-pressed ceramic cores, and cast posts and cores yield comparable survival rates and fracture strengths for the restoration of crowned maxillary incisors with moderate coronal defects. Survival rates and fracture strengths for zirconia posts with composite cores are significantly lower, so this combination cannot be recommended for clinical use. SN - 0893-2174 UR - https://www.unboundmedicine.com/medline/citation/11842907/Survival_rate_and_fracture_strength_of_endodontically_treated_maxillary_incisors_with_moderate_defects_restored_with_different_post_and_core_systems:_an_in_vitro_study_ DB - PRIME DP - Unbound Medicine ER -