Paper Information

Journal:   JOURNAL OF DENTAL BIOMATERIALS   2018 , Volume 5 , Number 1; Page(s) 533 To 542.
 
Paper: 

INFLUENCE OF ER,CR:YSGG LASER SURFACE TREATMENTS ON MICRO PUSH-OUT BOND STRENGTH OF FIBER POSTS TO COMPOSITE RESIN CORE MATERIALS

 
 
Author(s):  GHAVAMI LAHIJI M., BENEDICENTI S., KARIMIAN R., SHAHABI S.*
 
* LASER RESEARCH CENTER OF DENTISTRY, DENTISTRY RESEARCH INSTITUTE, DEPARTMENT OF DENTAL BIOMATERIALS, SCHOOL OF DENTISTRY, TEHRAN UNIVERSITY OF MEDICAL SCIENCES, TEHRAN, IRAN
 
Abstract: 

Statement of problem: The bonding of fiber post to resin core or root dentin is challenged by limited penetration of resin material to the polymeric matrix of fiber posts.
Objectives: The purpose of this study was to investigate the effect of Er, Cr: YSGG on micro push-out bond strength of glass fiber posts to resin core material.
Materials and Methods: We used 2 commercially available fiber posts, Exacto (Angelus) and White Post DC (FGM), which had similar coronal diameters. Specimens of each fiber post (n=36) were randomly divided into three subgroups (n=12 posts per group) according to different surface treatment methods: control (no surface treatment), irradiation by 1W Er, Cr: YSGG, and irradiation by 1.5W Er, Cr: YSGG. A cylindrical plastic tube was placed around the post. Resin core material was filled into the tube and cured. Coronal portions of the posts were sectioned into 1-mm-thick slices. Then, the specimens were subjected to a thermocyling device for 3000 cycles. The micro push-out test was carried out using a Universal Testing Machine. Data were analyzed using one-way ANOVA followed by Tukey’s HSD post hoc test to investigate the effect of different surface treatments on each type of fiber post.
Results: The 1.5W Er, Cr: YSGG laser statistically reduced micro push-out bond strength values in the Exacto groups (P<0.05). However, there was no significant difference between the control and 1W Er, Cr: YSGG groups. We observed no significant difference among different surface treatment methods in the White post DC groups (P>0.05). Mode of failure analysis showed that mixed failure was the predominant failure type for all surface treatment groups.
Conclusions: The beneficial effect of Er, Cr: YSGG laser application could not be confirmed based on the results of this in vitro study. Er, Cr: YSGG laser could not significantly enhance the bond strength values. However, the 1.5W laser statistically decreased micro push-out bond strength in the Exacto fiber posts.

 
Keyword(s): FIBER POST, RESIN CORE BUILD-UP, ER, CR:YSGG LASER, BOND STRENGTH
 
References: 
 
  pdf-File tarjomyar Yearly Visit 34
 
Latest on Blog
Enter SID Blog