Fracture resistance of endodontically treated molars restored with horizontal fiberglass posts or indirect techniques.
Because of the many possibilities for endodontically restoring the posterior teeth and the high prevalence of restoration failures, this topic continues to be of major concern. A composite resin (CR) restoration reinforced by a horizontal fiberglass post may improve the fracture resistance of endodontically treated teeth. The authors investigated this possibility by comparing the fracture resistance of molars restored with direct techniques with that of molars restored with indirect techniques.



The authors divided 50 extracted sound third molars into 5 groups: sound teeth, onlay (ON), inlay (IN), direct CR, and transfixed fiberglass post (TFP) plus direct CR. The authors performed standardized mesio-occlusodistal cavity preparations and endodontic treatments. The authors cemented indirect restorations of Lava Ultimate (3M ESPE) adhesively in the ON and IN groups. The authors restored CR group teeth directly with Filtek Z230 XT (3M ESPE). In the TFP group, the authors transfixed 2 fiberglass posts horizontally and restored the teeth directly with CR. Thereafter, the authors submitted the teeth to cyclic fatigue loading with 500,000 cycles at 200 newtons. The authors tested fracture resistance in newtons in a universal testing machine. The authors analyzed data with 1-way analysis of variance and a Tukey test (P < .05).



Sound teeth had the highest fracture resistance. ON had the highest recovery of resistance, followed by TFP. CR had the lowest recovery, which was similar to that of IN.



Endodontically treated molars restored with TFP plus CR had fracture resistance similar to those restored with ON, which was higher than that for IN or CR only.



Horizontal TFPs placed inside a composite restoration had the same performance as did ON restorations.
Carolina Ritter
CR
Bromberg
Caroline Beatriz
CB
Alves
Deborah
D
Stona
Ana Maria
AM
Spohr
Sinval Adalberto
SA
Rodrigues-Junior
Rafael
R
Melara
Luiz Henrique
LH
Burnett
D003188:Composite Resins / Q000737:chemistry; D003738:Dental Cements / Q000737:chemistry; D019232:Dental Restoration Failure; D003793:Dental Restoration, Permanent / Q000379:methods*; D003799:Dental Stress Analysis; D005898:Glass / Q000737:chemistry; D006801:Humans; D066298:In Vitro Techniques; D008963:Molar; D011176:Post and Core Technique; D014082:Tooth Fractures / Q000517:prevention & control*; D019553:Tooth, Nonvital / Q000628:therapy*
D003188:Composite Resins; D003738:Dental Cements; C009753:fiberglass; C533204:filtek Z350
CAD/CAM; Fracture resistance; composite resin; endodontic treatment; fiberglass post; molar