Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Crack propensity of porcelain laminate veneers: A simulated operatory evaluation
Autore:
Magne, P; Kwon, KR; Belser, UC; Hodges, JS; Douglas, WH;
Indirizzi:
UnivlMinnesota, Sch Dent, Minnesota Dent Res Ctr Biomat & Biomech, Dept Ora Univ Minnesota Minneapolis MN USA 55455 es Ctr Biomat & Biomech, Dept Ora Univ Geneva, Sch Dent Med, Dept Prosthodont, Geneva, Switzerland Univ Geneva Geneva Switzerland d, Dept Prosthodont, Geneva, Switzerland Univ Geneva, Sch Dent Med, Dept Prevent & Therapeut, Geneva, Switzerland Univ Geneva Geneva Switzerland Prevent & Therapeut, Geneva, Switzerland Univinneapolis, Sch Dent, Minnesota Oral Hlth Clin Res Ctr, Biostat Core, M Univ Minnesota Minneapolis MN USA 55455 lth Clin Res Ctr, Biostat Core, M
Titolo Testata:
JOURNAL OF PROSTHETIC DENTISTRY
fascicolo: 3, volume: 81, anno: 1999,
pagine: 327 - 334
SICI:
0022-3913(199903)81:3<327:CPOPLV>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
DIE SPACERS; RESTORATIONS; CROWN; INCISORS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Citazioni:
22
Recensione:
Indirizzi per estratti:
Indirizzo: Magne, P UnivlMinnesota, Sch Dent, Minnesota Dent Res Ctr Biomat & Biomech, Dept Ora Univ Minnesota 16-212 Moos Tower,515 Delaware St SE Minneapolis MN USA 55455
Citazione:
P. Magne et al., "Crack propensity of porcelain laminate veneers: A simulated operatory evaluation", J PROS DENT, 81(3), 1999, pp. 327-334

Abstract

Statement of problem. Anterior teeth are especially subject to the thermalvariations of ingested food and drinks. Postoperative cracks of porcelain laminates are considered a possible consequence of polymerization shrinkage, function, and thermocycling. Purpose. This investigation was conducted to define the parameters associated with the development of cracks in porcelain veneers using cyclic thermal fatigue. Material and methods. Twenty-seven maxillary incisors were restored with porcelain laminate veneers and subjected to thermocycling (5 degrees C to 50degrees C) for 1000 cycles. Ceramic cracks were reported for 11 of the 27 specimens. Teeth were sectioned and prepared for SEM analysis. Measurementsof the ceramic and the luting composite thicknesses were performed for each specimen at different restoration locations (facial, incisal, and proximal). Results. No significant differences in the ceramic or the luting compositethicknesses were observed between cracked and uncracked specimens. However, significant differences were observed in the ratio of the ceramic and luting composite thicknesses. Most cracked samples exhibited a ratio at the facial location below 3.0 (2.6 +/- 0.35), whereas most noncracked specimens were above this value (3.9 +/- 0.19). Incisal and especially proximal measurements alone were not significantly different between cracked versus uncracked specimens. Ceramic was slightly thinner in the facial aspect than in the proximal aspect, which was also thinner than the incisal aspect. Composite in the facial aspect was thinner in the cervical area than in the incisalthird of the tooth. Conclusions. Significant cyclic temperature changes can induce the development of flaws in porcelain veneers. Control of tooth reduction and the application of die spacers during laboratory procedures undoubtedly represent key elements; a sufficient and even thickness of ceramic combined with a minimal thickness of luting composite will provide the restoration with a favorable configuration with regard to crack propensity, namely, a ceramic and luting composite thickness ratio above 3.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/11/20 alle ore 09:59:14