Effect of acid conditioning of root canal dentin on the retention of adhesively luted glass fiber-reinforced composite (FRC) posts.
OBJECTIVE
To assess the retention of glass FRC posts luted with resin cements after conditioning the canal dentin with different acidic treatments.


METHODS
Post spaces were prepared in six groups of eight endodontically treated extracted teeth. Glass FRC posts were luted after etching the canal dentin with phosphoric acid and/or applying ED-Primer, Clearfil New Bond or XP Bond. The groups with their respective etching time, primer and cement combinations were as follows. ED: ED-Primer only and Panavia 21; ED15: 15 seconds phosphoric acid treatment, ED-Primer and Panavia 21; NB15: 15 seconds phosphoric acid treatment, Clearfil New Bond and Panavia 21; NB30: 30 seconds phosphoric acid treatment, Clearfil New Bond and Panavia 21; XP15: 15 seconds phosphoric acid treatment, XP Bond and Calibra; XP30: 30 seconds phosphoric acid treatment, XP Bond and Calibra. Specimens were stored in water for 30 days and subjected to simulated aging conditions. Post retention was measured in tension at a crosshead speed of 2 mm/minute. Analysis of variance and Bonferroni multiple range tests were conducted for data analysis.


RESULTS
The mean (standard deviation) retention values in Newtons (N) were: ED: 180.9 (44.9); ED15: 278.3 (37.7); NB15: 283.8 (84.9); NB30: 187.7 (60.0), XP15: 216.8 (46.8), XP30: 199.6 (34.0). The retention values of ED15 and NB15 were significantly higher than those of ED and NB30 groups respectively. There were no statistically significant differences between XP Bond groups. Microscopic evaluation of post surfaces demonstrated that the debonding failure was adhesive at the cement-post and cement-dentin interfaces.
Albashaireh
Zakereyya S
ZS
Department of Conservative Dentistry, Faculty of Dentistry, Jordan University of Science & Technology, P.O. Box 3030, Irbid 22110, Jordan. albashai@just.edu.jo
Ghazal
Muhamad
M
Kern
Matthias
M
D000134:Acid Etching, Dental / Q000379:methods*; D002484:Cementation / Q000379:methods; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding; D003764:Dental Materials / Q000737:chemistry*; D017268:Dental Prosthesis Retention; D003786:Dental Pulp Cavity / Q000648:ultrastructure*; D003799:Dental Stress Analysis / Q000295:instrumentation; D003804:Dentin / Q000648:ultrastructure*; D017220:Dentin-Bonding Agents / Q000737:chemistry; D005898:Glass / Q000737:chemistry*; D006801:Humans; D008689:Methacrylates / Q000737:chemistry; D010710:Phosphates / Q000737:chemistry; D010756:Phosphoric Acids / Q000737:chemistry; D011176:Post and Core Technique / Q000295:instrumentation*; D019279:Resin Cements / Q000737:chemistry*; D018915:Root Canal Preparation / Q000379:methods; D013314:Stress, Mechanical; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors; D014867:Water / Q000737:chemistry
C433205:Calibra; C029849:Clearfil Bonding Agent; D003188:Composite Resins; D003764:Dental Materials; D017220:Dentin-Bonding Agents; C500742:ED Primer II; D008689:Methacrylates; C093719:Panavia TPN-S; D010710:Phosphates; D010756:Phosphoric Acids; D019279:Resin Cements; C532387:XP-Bond; C009753:fiberglass; D014867:Water; C030242:phosphoric acid