In vitro study of fracture resistance of bovine roots using different intraradicular post systems.
OBJECTIVE
This study evaluated, in vitro, the fracture resistance of bovine roots restored with five different intraradicular post systems.


METHODS
Seventy-five bovine roots of similar dimensions were assigned to five groups (n = 15), according to the intraradicular post system used: cast post and core; titanium post; carbon-fiber post; glass-fiber post; and zirconium-oxide post. Following post cementation, the roots were embedded in polystyrene resin composite and submitted to fracture-resistance testing, with a compressive load at an angle of 135 degrees in relation to the long axis of the root at a speed of 0.5 mm/min. All data were statistically analyzed with analysis of variance and Sidak test.


RESULTS
The titanium posts presented higher mean values of fracture resistance when compared to glass-fiber posts and zirconium-oxide posts and similar values compared to carbon-fiber posts. Also, roots treated with cast posts and cores presented similar results when compared to roots treated with prefabricated posts.


CONCLUSIONS
All prefabricated intraradicular post systems evaluated presented similar resistance to fracture when compared to cast posts and cores, and among the prefabricated ones, titanium and carbon-fiber posts could be best indicated.
Mitsui
Fabio Hiroyuki Ogata
FH
Department of Restorative Dentistry, University of Campinas, School of Dentistry of Piracicaba, São Paulo, Brazil.
Marchi
Giselle Maria
GM
Pimenta
Luiz André Freire
LA
Ferraresi
Priscila Miucci
PM
D000704:Analysis of Variance; D000818:Animals; D002244:Carbon; D000077482:Carbon Fiber; D002417:Cattle; D003722:Dental Alloys; D003799:Dental Stress Analysis; D005898:Glass; D008422:Materials Testing; D011176:Post and Core Technique; D011897:Random Allocation; D014025:Titanium; D014082:Tooth Fractures / Q000517:prevention & control*; D014092:Tooth Root / Q000293:injuries; D015040:Zirconium
D000077482:Carbon Fiber; D003722:Dental Alloys; C009753:fiberglass; D002244:Carbon; D015040:Zirconium; D014025:Titanium; C028541:zirconium oxide