[The effect of light transmission of canal posts on the depth of cure of resin composite].
OBJECTIVE
To evaluate the efficacy of roots reinforced by light-cured composite resin through three different posts in simulated teeth.


METHODS
Simulated metal mold as flared canal was filled with resin composite in which three kinds of posts were inserted into the center separately and photopolymerized through them. Cured resins were sectioned vertically, then invested and polished. Hardness measurements were made from up to bottom per 1mm at two horizontal distances (d1=0.5mm,d2=1.5mm) from the central post. SAS 6.12 software package was used for statistical analysis.


RESULTS
With the increase in width, there was no difference for decrease among the three groups. There was difference in the width of cure between d1 and d2 in 3 groups. As the depth increased, difference of decrease was found among the three groups. Decline of light-transmitting post was the minimal,while that of post B(match-post) was the maximal.There was significant difference in the depth of cure between the light-transmitting post and two control posts (P<0.05).


CONCLUSIONS
The results suggest that light-transmitting post has a remarkable utility compared with the control posts.Using light-transmitting post reconstructing flared roots may reaches a better outcome.
Luo
Yi-xi
YX
Department of Prosthodontics, College of Stomatology, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai Key Laboratory of Stomatology, Shanghai 200011, China. luoyixi_85417@hotmail.com
D003188:Composite Resins; D003786:Dental Pulp Cavity; D006244:Hardness; D006801:Humans; D011176:Post and Core Technique; D012390:Root Canal Therapy
D003188:Composite Resins