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Marginal adaptation and fracture resistance of adhesively luted glass fibre-composite reinforced molar crowns with different inner crown surfaces.
J Dent. 2003 Sep; 31(7):503-8.JD

Abstract

OBJECTIVES

This study compared the influence of different inner crown surfaces on the fracture resistance and marginal adaptation of adhesively fixed glass fibre-reinforced molar crowns.

MATERIALS AND METHODS

Vectris/Targis crowns were constructed with an inner framework of glass fibres (directly on the tooth) or an inner veneering composite layer between the fibre-framework and the tooth-substance. Both groups were sandblasted inside using Al(2)O(3); 50 microm grain size (200 kPa, 20 s) and silane coated. A control group had the inner fibre framework, but was neither sandblasted nor silane coated. The crowns were adhesively cemented on extracted human teeth, and thermally cycled and mechanically loaded (TCML: 6000 x 5 degrees C/55 degrees C; 1.2 x 10(6) x 50 N, 1.66 Hz). The marginal adaptation before and after TCML was evaluated and the fracture resistance was investigated using a Zwick universal testing machine.

RESULTS

After TCML the proportion of 'perfect margin' of the control group decreased significantly at the interface crown/cement. For the variations with an inner fibre framework or inner composite layer the marginal adaptation or fracture resistance did not decrease significantly after ageing. The fracture resistance values were control: 1509N+/-486; inner fibre framework: 1896N+/-342; inner composite layer: 1754N+/-340.

CONCLUSIONS

In the case of the investigated fibre framework and veneering composite, the inner surface of glass fibre-reinforced molar crowns can be covered with a composite layer or with a glass fibre framework. Both methods achieve comparable high fracture strengths and reliable marginal adaptation.

Authors+Show Affiliations

Department of Prosthodontics, University of Regensburg, Franz-Josef-Strauss-Allee 11, 93042, Regensburg, Germany. michael.behr@klinik.uni-regensberg.deNo affiliation info availableNo 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

12927462

Citation

Behr, M, et al. "Marginal Adaptation and Fracture Resistance of Adhesively Luted Glass Fibre-composite Reinforced Molar Crowns With Different Inner Crown Surfaces." Journal of Dentistry, vol. 31, no. 7, 2003, pp. 503-8.
Behr M, Rosentritt M, Sikora MI, et al. Marginal adaptation and fracture resistance of adhesively luted glass fibre-composite reinforced molar crowns with different inner crown surfaces. J Dent. 2003;31(7):503-8.
Behr, M., Rosentritt, M., Sikora, M. I., Karl, P., & Handel, G. (2003). Marginal adaptation and fracture resistance of adhesively luted glass fibre-composite reinforced molar crowns with different inner crown surfaces. Journal of Dentistry, 31(7), 503-8.
Behr M, et al. Marginal Adaptation and Fracture Resistance of Adhesively Luted Glass Fibre-composite Reinforced Molar Crowns With Different Inner Crown Surfaces. J Dent. 2003;31(7):503-8. PubMed PMID: 12927462.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Marginal adaptation and fracture resistance of adhesively luted glass fibre-composite reinforced molar crowns with different inner crown surfaces. AU - Behr,M, AU - Rosentritt,M, AU - Sikora,M I, AU - Karl,P, AU - Handel,G, PY - 2003/8/21/pubmed PY - 2003/12/24/medline PY - 2003/8/21/entrez SP - 503 EP - 8 JF - Journal of dentistry JO - J Dent VL - 31 IS - 7 N2 - OBJECTIVES: This study compared the influence of different inner crown surfaces on the fracture resistance and marginal adaptation of adhesively fixed glass fibre-reinforced molar crowns. MATERIALS AND METHODS: Vectris/Targis crowns were constructed with an inner framework of glass fibres (directly on the tooth) or an inner veneering composite layer between the fibre-framework and the tooth-substance. Both groups were sandblasted inside using Al(2)O(3); 50 microm grain size (200 kPa, 20 s) and silane coated. A control group had the inner fibre framework, but was neither sandblasted nor silane coated. The crowns were adhesively cemented on extracted human teeth, and thermally cycled and mechanically loaded (TCML: 6000 x 5 degrees C/55 degrees C; 1.2 x 10(6) x 50 N, 1.66 Hz). The marginal adaptation before and after TCML was evaluated and the fracture resistance was investigated using a Zwick universal testing machine. RESULTS: After TCML the proportion of 'perfect margin' of the control group decreased significantly at the interface crown/cement. For the variations with an inner fibre framework or inner composite layer the marginal adaptation or fracture resistance did not decrease significantly after ageing. The fracture resistance values were control: 1509N+/-486; inner fibre framework: 1896N+/-342; inner composite layer: 1754N+/-340. CONCLUSIONS: In the case of the investigated fibre framework and veneering composite, the inner surface of glass fibre-reinforced molar crowns can be covered with a composite layer or with a glass fibre framework. Both methods achieve comparable high fracture strengths and reliable marginal adaptation. SN - 0300-5712 UR - https://www.unboundmedicine.com/medline/citation/12927462/Marginal_adaptation_and_fracture_resistance_of_adhesively_luted_glass_fibre_composite_reinforced_molar_crowns_with_different_inner_crown_surfaces_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0300571203000721 DB - PRIME DP - Unbound Medicine ER -