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Influence of preparation mode and depth on the fracture strength of zirconia ceramic abutments restored with lithium disilicate crowns.
Int J Oral Maxillofac Implants. 2012 Jul-Aug; 27(4):839-48.IJ

Abstract

PURPOSE

Zirconia implant abutments offer enhanced esthetics and promote biologic sealing; however, the effect of laboratory or intraoral preparation on the mechanical stability of zirconia has not been investigated. The purpose of the study was to evaluate the influence of the preparation mode and depth on the fracture strength of zirconia abutments restored with lithium disilicate crowns.

MATERIALS AND METHODS

To replace a maxillary central incisor (11.0 mm in height and 8.0 mm in width), 35 lithium disilicate crowns were cemented onto zirconia abutments on 4.5- ° - 15-mm titanium implants. Lithium disilicate implant crowns were divided into five study groups (n = 7) according to the abutment preparation mode (milling by the manufacturer or milling by the Celay System [Mikrona] [P]) and preparation depth (0.5 mm [A], 0.7 mm [B], or 0.9 mm [C]). All groups were subjected to quasi-static loading (S) at 135 degrees to the implant axis in a universal testing machine.

RESULTS

Mean fracture strengths were: group SA, 384 ± 84 N (control); group SB, 294 ± 95 N; group SPB, 332 ± 80 N; group SC, 332 ± 52; group SPC, 381 ± 101 N. All specimens presented a typical fracture mode within the implant/abutment internal connection. Multiple regression analysis revealed that preparation depth up to 0.7 mm statistically influenced the fracture strength (P = .034), whereas the preparation mode did not seem to play an important role (P = .175).

CONCLUSION

Regardless of preparation mode, circumferential preparation of zirconia abutments might negatively affect the fracture strength of adhesively cemented single implant lithium disilicate crowns.

Authors+Show Affiliations

Koutayas SO
Department of Prosthodontics, School of Dentistry, Albert-Ludwig University, Freiburg, Germany. koutayas@otenet.gr
Mitsias M
No affiliation info available
Wolfart S
No affiliation info available
Kern M
No affiliation info available

MeSH

CeramicsCrownsDental AbutmentsDental PorcelainDental Restoration FailureDental Stress AnalysisHumansIncisorMaterials TestingMaxillaTitaniumZirconium

Pub Type(s)

Journal Article

Language

eng

PubMed ID

22848886

Citation

Koutayas, Spiridon-Oumvertos, et al. "Influence of Preparation Mode and Depth On the Fracture Strength of Zirconia Ceramic Abutments Restored With Lithium Disilicate Crowns." The International Journal of Oral & Maxillofacial Implants, vol. 27, no. 4, 2012, pp. 839-48.
Koutayas SO, Mitsias M, Wolfart S, et al. Influence of preparation mode and depth on the fracture strength of zirconia ceramic abutments restored with lithium disilicate crowns. Int J Oral Maxillofac Implants. 2012;27(4):839-48.
Koutayas, S. O., Mitsias, M., Wolfart, S., & Kern, M. (2012). Influence of preparation mode and depth on the fracture strength of zirconia ceramic abutments restored with lithium disilicate crowns. The International Journal of Oral & Maxillofacial Implants, 27(4), 839-48.
Koutayas SO, et al. Influence of Preparation Mode and Depth On the Fracture Strength of Zirconia Ceramic Abutments Restored With Lithium Disilicate Crowns. Int J Oral Maxillofac Implants. 2012 Jul-Aug;27(4):839-48. PubMed PMID: 22848886.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Influence of preparation mode and depth on the fracture strength of zirconia ceramic abutments restored with lithium disilicate crowns. AU - Koutayas,Spiridon-Oumvertos, AU - Mitsias,Miltiadis, AU - Wolfart,Stefan, AU - Kern,Matthias, PY - 2012/8/1/entrez PY - 2012/8/1/pubmed PY - 2014/1/15/medline SP - 839 EP - 48 JF - The International journal of oral & maxillofacial implants JO - Int J Oral Maxillofac Implants VL - 27 IS - 4 N2 - PURPOSE: Zirconia implant abutments offer enhanced esthetics and promote biologic sealing; however, the effect of laboratory or intraoral preparation on the mechanical stability of zirconia has not been investigated. The purpose of the study was to evaluate the influence of the preparation mode and depth on the fracture strength of zirconia abutments restored with lithium disilicate crowns. MATERIALS AND METHODS: To replace a maxillary central incisor (11.0 mm in height and 8.0 mm in width), 35 lithium disilicate crowns were cemented onto zirconia abutments on 4.5- ° - 15-mm titanium implants. Lithium disilicate implant crowns were divided into five study groups (n = 7) according to the abutment preparation mode (milling by the manufacturer or milling by the Celay System [Mikrona] [P]) and preparation depth (0.5 mm [A], 0.7 mm [B], or 0.9 mm [C]). All groups were subjected to quasi-static loading (S) at 135 degrees to the implant axis in a universal testing machine. RESULTS: Mean fracture strengths were: group SA, 384 ± 84 N (control); group SB, 294 ± 95 N; group SPB, 332 ± 80 N; group SC, 332 ± 52; group SPC, 381 ± 101 N. All specimens presented a typical fracture mode within the implant/abutment internal connection. Multiple regression analysis revealed that preparation depth up to 0.7 mm statistically influenced the fracture strength (P = .034), whereas the preparation mode did not seem to play an important role (P = .175). CONCLUSION: Regardless of preparation mode, circumferential preparation of zirconia abutments might negatively affect the fracture strength of adhesively cemented single implant lithium disilicate crowns. SN - 1942-4434 UR - https://www.unboundmedicine.com/medline/citation/22848886/Influence_of_preparation_mode_and_depth_on_the_fracture_strength_of_zirconia_ceramic_abutments_restored_with_lithium_disilicate_crowns_ DB - PRIME DP - Unbound Medicine ER -