Comparison of fracture resistance of bonded glass fiber posts at different lengths.
OBJECTIVE
To evaluate in vitro the fracture resistance of quartz fiber posts for three different dowel lengths.


METHODS
30 single-rooted human premolars with similar root length and diameter were endodontically treated and randomly divided into three experimental groups (n = 10) according to the post space depth created: (1) 5 mm; (2) 7 mm; (3) 9 mm. Quartz fiber posts (Endo Light post) were cemented using a dual cured resin cement with its adhesive system (Prime & Bond NT + Fluorocore 2). After 24 hours, specimens were embedded in acrylic resin and loaded under continuous compressive force at the extruding coronal part of the post (45-degree angle) to the long tooth axis (crosshead speed: 0.75 mm/minute). Forces at fracture (Newtons) were recorded. One-way ANOVA and Tukey tests were used for the statistical analysis (P < 0.05).


RESULTS
Mean strength values (SD) were: (1) 40.52 (3.14); (2) 41.68 (5.31); (3) 44.88 (6.77), respectively. No statistically significant differences were found among the groups.
Department of Fixed Prosthodontics and Restorative Dentistry, University of Siena, Italy.
Remo
R
Schiavetti
Franklin
F
García-Godoy
Manuel
M
Toledano
Claudia
C
Mazzitelli
Alberto
A
Barlattani
Marco
M
Ferrari
Raquel
R
Osorio
D001641:Bicuspid; D002484:Cementation / Q000379:methods; D003188:Composite Resins / Q000737:chemistry; D003764:Dental Materials / Q000737:chemistry*; D019232:Dental Restoration Failure; D005460:Fluorides, Topical / Q000737:chemistry; D005898:Glass / Q000737:chemistry*; D006801:Humans; D008422:Materials Testing; D011109:Polymethacrylic Acids / Q000737:chemistry; D011176:Post and Core Technique / Q000295:instrumentation*; D011791:Quartz / Q000737:chemistry*; D019279:Resin Cements / Q000737:chemistry; D018915:Root Canal Preparation / Q000379:methods; D055116:Self-Curing of Dental Resins; D013314:Stress, Mechanical; D013997:Time Factors
D003188:Composite Resins; D003764:Dental Materials; D005460:Fluorides, Topical; C074316:FluoroCore; D011109:Polymethacrylic Acids; C425843:Prime and Bond NT; D019279:Resin Cements; C009753:fiberglass; D011791:Quartz