[Fracture resistance of the all-ceramic posts in post-and-core system].
OBJECTIVE
To make a comparative study on the fracture resistance of the all-ceramic posts in post-and-core system where the ceramic core was combined with the post by direct sintering and by two other methods.


METHODS
A total of 15 all-ceramic posts fabricated by alumina-zirconia nano-composite infiltrated ceramics were randomly divided into three groups. They were given the following treatments: Group A: forming and combining the ceramic core with the post by direct sintering; group B: combining the ceramic core with the post by use of 3M RelyX for adhesion; group C: forming composite resin core onto the post. Each specimen was placed into a special jig and subjected to a load perpendicular to the post axis on INSTRON 4302 universal testing instrument until failure. ANOVA was used for statistical analysis.


RESULTS
There was no statistically significant difference between the groups (P>0.05).


CONCLUSIONS
The findings indicate that the strength of the post remains uninfluenced during the combination of the core with the post by direct sintering.
Wan
Qian-bing
QB
Department of Prosthodontics, West China School of Stomatology, Sichuan University, Chengdu 610041, China.
Lü
Jie
J
Jia
Yan
Y
Lu
Dong-mei
DM
Liao
Yun-mao
YM
D002516:Ceramics; D003776:Dental Porcelain / Q000737:chemistry; D019232:Dental Restoration Failure; D006801:Humans; D008422:Materials Testing; D011176:Post and Core Technique; D013314:Stress, Mechanical
D003776:Dental Porcelain