Advisory Committee Chair
Sandra J O'Neal
Advisory Committee Members
John O Burgess
Firoz Rahemtulla
Lance Ramp
Document Type
Thesis
Date of Award
2007
Degree Name by School
Master of Science (MS) School of Dentistry
Abstract
Adhesively cemented prefabricated posts are frequently employed for the restora-tion of endodontically treated teeth. Bonding agents may improve the post and core per-formance. Correct dentin bonding procedures are a critical factor in the bonded post re-tention, but adequate bonding in the canal space has been reported difficult to achieve. The operator is unable to visualize the depth of conditioner gel penetration into the canal, and its removal cannot be easily confirmed. Additional potential problems include excess water removal after rinsing the canal, inadequate primer coverage and/or removal, and poor curing methods for the resin luting agent. A technique to avoid these problems is utilized in this study. Another approach is the use of adhesive resin luting agents that do not require etching or even priming steps. The purpose of this study was to evaluate the regional bond strength of resin quartz-fiber posts cemented to root canal dentin with three dual-cure resin cements (etch-and-rinse, self-etch and, self-adhesive) and the effect of a variation in the cementation technique for the etch-and-rinse group, on the cervical, middle and apical levels of post space dentin. Forty eight extracted human single rooted teeth were obtained from local oral sur-geons. Endodontic procedure was performed on all teeth by cleaning and shaping the root canals with 21 mm stainless steel K- Flex hand files and copious sodium hypochlorite ii irrigation to a size 45 last apical instrument. Lateral condensation was performed on all teeth using gutta-percha and Roth’s eugenol based sealer. Each root canal was prepared to a standard depth of 13 mm for post insertion. Twelve specimens per group were ran-domly assigned to 1 control and 3 experimental groups: Group 1 (control), PermaFlo DC bonding system with conventional cementation technique; Group 2, PermaFlo DC bond-ing system with the TriAway and Endo-Eze tip device; Group 3, Panavia F 2.0 and ED Primer II; Group 4, RelyX Unicem. The prefabricated fiber posts were cemented with different resin luting systems following the manufacturer’s instructions for each specific cement agent. Each specimen was sectioned in four 2 mm slices. The interfacial bond strength and ultrastructure of the different adhesive systems were assessed with a push-out test and scanning electron microscopy (SEM). Mean maximum bond strengths before bonding failure occurred, were analyzed using two-way ANOVA for a combination of both variables (groups and root levels). A post hoc test, Scheffe’s analysis, was utilized to make specific pairwise comparisons. Our findings show a statistically significant difference in bond strength within the four resin luting systems and techniques (p < 0.001). We also discovered that the strength of adhesive bond is directly related to the depth level within the post space; highest at the cervical level decreasing progressively to the apical area of the post space. The etch and rinse resin luting system showed the highest mean bond strengths compared to the self-etch and self-adhesive systems.
Recommended Citation
Montes, Carlos A Polo, "The Effect Of Cementation Technique On The Retention Of Adhesively Cemented Prefabricated Posts" (2007). All ETDs from UAB. 3610.
https://digitalcommons.library.uab.edu/etd-collection/3610