COMPARISON OF THE PUSH - OUT BOND STRENGTH OF POST SYSTEMS PRODUCED IN DIFFERENT CONTENT AND DESIGN

Tez Türü: Diş Hekimliğinde Uzmanlık

Tezin Yürütüldüğü Kurum: İnönü Üniversitesi, Diş Hekimliği Fakültesi, Klinik Bilimler, Türkiye

Tez Danışmanı: Güler Yıldırım Avcu

Tezin Onay Tarihi: 2020

Tezin Dili: Türkçe

Özet:

COMPARISON OF THE PUSH - OUT BOND STRENGTH OF POST SYSTEMS PRODUCED IN DIFFERENT CONTENT AND DESIGN Objective: Fiber post systems have been widely used for the restoration of teeth that have lost a considerable amount of their crown structure. The aim of this study is to evaluate the effect the content, design and thermal cycling of the current fiber posts push- out resistance. Material and Method: 80 extracted human upper anterior teeth were endodontically treated. (n = 10) Teeth are embedded in acrylic resin. The depth of the post space was 9.0 mm. Four types of post systems were used: Rebilda post GT (V) (Voco, Germany), Reforpost fiber (R) (Angelus, Brazil), Unicore post (U) (Ultradent, France) and EverStick post (E) (GC Europe, Belgium).The dual cure resin cement GCEM Link Force (GC Europe, Belgium) was used for luting fiber posts according to the manufacturers’ recommendations. The intracanal post in each root was sectioned into three segments of coronal, middle, and apical. Half of the disk-shaped specimens (n=10) were subjected thermal cycling for the in vitro aging. Each cross-section was subjected to push-out bond strength test at a crosshead speed of 1mm/minute until failure. Push-out bond strength data were analyzed using Kruskall Wallis and Chisquare measures. Failure modes were analyzed with stereomicroscope. Results: The bond strength at the coronal and middle segments were higher than apical group.( p<0,01) The bond strength thermal cycling subjected groups were lower than the other groups. Overall, the bond strength EverStick post (GC Europe, was significantly lower than then the others. (p=0,001;p<0,01) Conclusions: The push – out bond strength decreases from coronal to apical. The push - out strength of the rigid Rebilda post GT (Voco, Germany), Reforpost fiber (Angelus, Brazil) and Unicore post (Ultradent, France) are higher from the soft, flexible EverStick post (GC Europe, Belgium). Thermal cycling decreases push - out bond strength Keywords: fiber post, resin cement, push-out strength, thermal cycling