Microtensile bond strength of nonmetallic dowels bonded to radicular dentin with self-etch adhesives.
OBJECTIVE
The bonding potential of nonmetallic dowels to root dentin, particularly with new self-etch adhesives, has not been fully investigated. The aim of this study was to determine microtensile bond strength (microTBS) of nonmetallic dowels, including a novel glass fiber dowel, when bonded to radicular dentin with self-etch adhesives.


METHODS
Crowns of extracted anterior teeth were severed, and endodontic treatment was performed. Teeth were divided into six groups according to dowel/adhesive. Teeth received dowels as follows: group I: Light Post + Clearfil-SE Bond/Panavia-F (SE/PF), group II: Light Post + Xeno III/Panavia-F (XN/PF), group III: ParaPost Fiber White + SE/PF, group IV: ParaPost Fiber White + XN/PF, group V: everStick Post + SE/PF, and group VI: everStick Post + XN/PF. Teeth were sectioned to produce 1 mm specimens from both cervical and middle thirds with the dowel at the center. Specimens were tested in a special machine, and microTBS values were determined.


RESULTS
Mean microTBS values and SDs in MPa for the cervical region were as follows: group I: 10.36 (1.88), group II: 8.51 (1.41), group III: 11.61 (1.06), group IV: 9.37 (1.61), group V: 14.22 (1.16), and group VI: 12.97 (1.69). Group V had the highest mean value-significantly higher than the means of groups I, II, III, and IV (p < 0.0001 to p < 0.02). For the middle region: group I, 9.72 (1.61); group II, 7.62 (1.42); group III, 10.28 (0.75); group IV, 8.48 (1.51); group V, 13.23 (1.06); group VI, 11.07 (1.49). Group V also had highest mean value-significantly higher than the means of groups I, II, III, and IV (p < 0.0001 to p < 0.004).


CONCLUSIONS
everStick glass fiber dowel, bonded with either adhesive, showed the highest microTBS. Microtensile bond strengths were not significantly different with cervical root dentin than with middle root dentin.
Abo El-Ela
Omar A
OA
Department of Fixed Prosthodontics, Suez Canal University, Ismailia, Egypt.
Atta
Osama A
OA
El-Mowafy
Omar
O
D003188:Composite Resins / Q000737:chemistry; D001840:Dental Bonding; D003764:Dental Materials / Q000737:chemistry*; D017267:Dental Prosthesis Design; D003799:Dental Stress Analysis / Q000295:instrumentation; D003804:Dentin / Q000648:ultrastructure*; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D005898:Glass / Q000737:chemistry; D006801:Humans; D006813:Humidity; D008422:Materials Testing; D011176:Post and Core Technique / Q000295:instrumentation*; D011791:Quartz / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry; D018915:Root Canal Preparation / Q000379:methods; D013314:Stress, Mechanical; D013696:Temperature; D013718:Tensile Strength; D013997:Time Factors; D019237:Tooth Cervix / Q000648:ultrastructure; D014867:Water / Q000737:chemistry
C438313:Clearfil SE Bond; D003188:Composite Resins; D003764:Dental Materials; D017220:Dentin-Bonding Agents; C438843:Panavia-Fluoro; D019279:Resin Cements; C487957:Xeno III; C496140:everStick; C009753:fiberglass; D014867:Water; D011791:Quartz