Avtor/Urednik		Jovanovski, Sašo; Popovski, Julie; Dakskobler, Aleš; Marion, Ljubo; Jevnikar, Peter
Naslov		The influence of crown ferrule on fracture resistance of endodontically treated maxillary central incisors
Tip		članek
Leto izdaje		2017
Obseg		str. str.
Jezik		eng
Abstrakt		Background: Prefabricated zirconia posts can contribute to increasing the fracture resistance of the endodontically treated teeth. Purpose. This in vitro study compared the fracture resistance of endodontically treated central maxillary incisors prepared with 2mm ferrule length to the ones without ferrule. Material and methods: Twenty-four caries-free maxillary central incisors were divided into 2 groups of 12. In group A circumferential external dentin shoulders were prepared for 2mm external dentin ferrule length. There was no ferrule preparation in Group B. Zirconia VALLPOST BO-S (Ø 1,6mm), Ljubljana, Slovenia were used with retention forms in the coronary part. Core build-up was made of pressed ceramics (IPS e.max Press, Ivoclar, Liechtenstein). Crowns were manufactured from the same ceramic material (IPS e.max Press, Ivoclar). After root canal treatment and post space preparation, all posts were cemented with an adhesive resin cement (Multilink Automix, Ivoclar). The specimens were embedded in acrylic resin blocks (ProBase Polymer/Monomer, Ivoclar) and loaded at an angle of 45 o to the long axis in an Instron Testing Machine 4301 (Instron Corp., USA) at a crosshead speed of 1mm/min until fracture. Fracture patterns and loads were recorded. A significance level of p<0.05 was used for all comparisons. Two-way analysis of variance was used for statistical analysis. Failure patterns were analyzed with the optical microscope Stereo Discovery V.8 (Carl Zeiss, Germany) and compared using the chi- square nonparametric test. Results: The mean values (+-SD) of fracture loads (N) for the Groups A and B were 664.63N (+-49.14) and 519.36N (+-71.65) recpectively. Significantly lower failure loads were recorded for the specimens in the group B. Failure patterns within the groups revealed non-catastrophic failure in 70% of the specimens for group A and 85% for group B. Conclusions: Within the limitations of this in vitro study, it can be concluded that zirconia VALLPOST BO-S (Ø 1,6mm) with press-ceramic cores and crowns, can be used for restoration of endodontically treated teeth. The teeth prepared with 2mm external dentin ferrule length were found to be more fracture resistant than teeth without ferrule.
Proste vsebinske oznake		endodontically treated teeth zirconia central incisors endodontsko zdravljeni zobje cirkonij centralni sekalci