Effect of different intraorifice barriers on the fracture resistance of roots obturated with Resilon or gutta-percha.
BACKGROUND
This study investigated and compared the root reinforcement potential of 3 different intraorifice barriers (mineral trioxide aggregate [MTA], resin-modified glass ionomer cement [Vitremer], and fiber-reinforced composite [FRC]) placed over root canals obturated with gutta-percha or Resilon.


METHODS
Crowns of 80 extracted human mandibular premolars were sectioned off to obtain 14-mm-long root specimens. After preparation of root canals with nickel-titanium rotary files, the roots were obturated with either the Resilon/Epiphany system or gutta-percha + AH Plus sealer. In both obturation groups, specimens were further subgrouped with respect to the intraorifice barrier material placed after removal of 3-mm coronal portion of the root fillings: (1) MTA, (2) Vitremer, and (3) FRC. The specimens were loaded vertically at 1 mm/min crosshead speed until vertical root fracture occurred. Results were evaluated statistically with two-way analysis of variance and Tukey tests.


RESULTS
Fracture resistance of roots was significantly affected by the type of intraorifice barrier (P < .05), but not by the type of obturation system used (P > .05).


CONCLUSIONS
The use of Vitremer and FRC significantly improved the fracture resistance, whereas MTA did not exhibit any reinforcing effect as an intraorifice barrier.
Nagas
Emre
E
Department of Endodontics, Faculty of Dentistry, Hacettepe University, Ankara, Turkey. emrenagas@yahoo.com
Uyanik
Ozgur
O
Altundasar
Emre
E
Durmaz
Veli
V
Cehreli
Zafer C
ZC
Vallittu
Pekka K
PK
Lassila
Lippo V J
LV
D017607:Aluminum Compounds / Q000737:chemistry / Q000627:therapeutic use; D001641:Bicuspid / Q000473:pathology; D017610:Calcium Compounds / Q000737:chemistry / Q000627:therapeutic use; D003188:Composite Resins / Q000737:chemistry / Q000627:therapeutic use; D003786:Dental Pulp Cavity / Q000187:drug effects*; D003799:Dental Stress Analysis / Q000295:instrumentation; D004338:Drug Combinations; D004853:Epoxy Resins / Q000737:chemistry / Q000627:therapeutic use; D005899:Glass Ionomer Cements / Q000737:chemistry / Q000627:therapeutic use; D006171:Gutta-Percha / Q000737:chemistry / Q000627:therapeutic use*; D006801:Humans; D008422:Materials Testing; D010087:Oxides / Q000737:chemistry / Q000627:therapeutic use; D019279:Resin Cements / Q000737:chemistry / Q000627:therapeutic use; D012387:Root Canal Filling Materials / Q000737:chemistry / Q000627:therapeutic use*; D018915:Root Canal Preparation / Q000295:instrumentation / Q000379:methods; D017640:Silicates / Q000737:chemistry / Q000627:therapeutic use; D013314:Stress, Mechanical; D014082:Tooth Fractures / Q000517:prevention & control*; D014092:Tooth Root / Q000293:injuries*
D017607:Aluminum Compounds; D017610:Calcium Compounds; D003188:Composite Resins; D004338:Drug Combinations; D004853:Epoxy Resins; D005899:Glass Ionomer Cements; D010087:Oxides; C438843:Panavia-Fluoro; D019279:Resin Cements; D012387:Root Canal Filling Materials; D017640:Silicates; C084550:Vitremer; C486893:epiphany sealer; C534916:epoxy resin-based root canal sealer; C496140:everStick; C086631:mineral trioxide aggregate; C486892:resilon sealer; D006171:Gutta-Percha