Examination of ceramic restorative material interfacial debonding using acoustic emission and optical coherence tomography.
Dent Mater
; 29(4): 382-8, 2013 Apr.
Article
em En
| MEDLINE
| ID: mdl-23337286
ABSTRACT
OBJECTIVE:
CAD/CAM ceramic restorative material is routinely bonded to tooth substrates using adhesive cement. This study investigates micro-crack growth and damage in the ceramic/dentin adhesive interface under fatigue shear testing monitored using the acoustic emission (AE) technique with optical coherence tomography (OCT).METHODS:
Ceramic/dentin adhesive samples were prepared to measure the shear bond strength (SBS) under static load. Fatigue shear testing was performed using a modified ISO14801 method. Loads in the fatigue tests were applied at 80%, 70%, and 60% of the SBS to monitor interface debonding. The AE technique was used to detect micro-crack signals in static and fatigue shear bond tests.RESULTS:
The results showed that the average SBS value in the static tests was 10.61±2.23MPa (mean±standard deviation). The average number of fatigue cycles in which ceramic/dentin interface damage was detected in 80%, 70% and 60% of the SBS were 152, 1962 and 9646, respectively. The acoustic behavior varied according to the applied load level. Events were emitted during 60% and 70% fatigue tests. A good correlation was observed between crack location in OCT images and the number of AE signal hits.SIGNIFICANCE:
The AE technique and OCT images employed in this study could potentially be used as a pre-clinical assessment tool to determine the integrity of cemented load bearing restored ceramic material. Sustainable cyclic load stresses in ceramic/dentin-bonded specimens were substantially lower than the measured SBS. Predicted S-N curve showed that the maximum endured load was 4.18MPa passing 10(6) fatigue cyclic.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Som
/
Cerâmica
/
Colagem Dentária
/
Análise de Falha de Equipamento
/
Cimentos Dentários
/
Dentina
/
Tomografia de Coerência Óptica
Tipo de estudo:
Prognostic_studies
Idioma:
En
Revista:
Dent Mater
Ano de publicação:
2013
Tipo de documento:
Article