Retention of Fiber and Cast Posts with Different Lengths: A Comparative Study

Objective: there is no definitive data on the strength of glass fiber and cast posts withdifferent length. this in vitro study was designed to investigate and compare the effect oflength on the retentive strength of glass fiber and cast posts.materials and methods: sixty recently extracted intact maxillary canine teeth were cut 1mm above the cej. the specimens were endodontically treated and randomly divided intofour groups (n=15). specimens in groups fp(9) and fp(12) were prepared using fiber postwith 9 and 12 mm in length while groups cp(9) and cp(12) used cast post with 9 and 12mm length respectively. the force required to dislodge each post was recorded as retentivestrength. collected data were statistically analyzed using two-way anova and post-hoctests (ل=5%).results: the mean retentive strength of groups fp(9), fp(12), cp(9) and cp(12) were203.74 (sd=38.46), 324.54 (sd=42.92), 156.82 (sd=32.69), and 210.73 (sd=54.60) respectively.the results revealed a significant difference among retention values of testedgroups, except for the fp(9) and cp(12) (p<0.05).conclusion: under the condition of this study, the retention of fiber posts was significantlymore than cast posts with the same length. on the other hand, post length seems tohave an impact on the retention of fiber and cast posts.