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In vitro evaluation of fracture resistance of various thickness fiber-reinforced composite inlay fpd / 대한치과보철학회지
The Journal of Korean Academy of Prosthodontics ; : 762-771, 2003.
Article in English | WPRIM | ID: wpr-176007
ABSTRACT
STATE OF

PROBLEM:

In dentistry, the minimally prepared inlay resin-bonded fixed partial denture (FPD) made of new ceromer / fiber-reinforced composite (FRC) was recently introduced. However, the appropriate dimensions for the long-term success and subsequent failure strength are still unknown.

PURPOSE:

The aim of this study was to investigate the most fracture-resistible thickness combination of the ceromer / FRC using a universal testing machine and an AE analyzer. MATERIAL AND

METHODS:

A metal jig considering the dimensions of premolars and molars was milled and 56-epoxy resin dies, which had a similar elastic modulus to that of dentin, were duplicated. According to manufacturer's instructions, the FRC beams with various thicknesses (2 to 4 mm) were constructed and veneered with the 1 or 2 mm-thick ceromers. The fabricated FPDs were luted with resin cement on the resin dies and stored at room temperature for 72 hours. AE (acoustic emission) sensors were attached to both ends, the specimens were subjected to a compressive load until fracture at a crosshead speed of 0.5 mm/min. The AE and failure loads were recorded and analyzed statistically.

RESULTS:

The results showed that the failure strength of the ceromer / FRC inlay FPDs was affected by the total thickness of the connectors rather than the ceromer to FRC ratio or the depth of the pulpal wall. Fracture was initiated from the interface and propagated into the ceromer layer regardless of the change in the ceromer / FRC ratio.

CONCLUSION:

Within the limitations of this study, the failure loads showed significant differences only in the case of different connector thicknesses, and no significant differences were found between the same connector thickness groups. The application of AE analysis method in a fiber-reinforced inlay FPD can be used to evaluate the fracture behavior and to analyze the precise fracture point.
Subject(s)

Full text: Available Index: WPRIM (Western Pacific) Main subject: Bicuspid / Denture, Partial, Fixed, Resin-Bonded / Resin Cements / Dentin / Dentistry / Elastic Modulus / Inlays / Molar Language: English Journal: The Journal of Korean Academy of Prosthodontics Year: 2003 Type: Article

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Full text: Available Index: WPRIM (Western Pacific) Main subject: Bicuspid / Denture, Partial, Fixed, Resin-Bonded / Resin Cements / Dentin / Dentistry / Elastic Modulus / Inlays / Molar Language: English Journal: The Journal of Korean Academy of Prosthodontics Year: 2003 Type: Article