Resistance of a 4-META-containing, methacrylate-based sealer to dislocation in root canals.
The dislocation resistance of root fillings created with MetaSEAL, a self-adhesive 4-META-containing methacrylate resin-based sealer, was evaluated. Forty-six incisors were cleaned and shaped using NaOCl and EDTA as irrigants. They were filled with gutta-percha/MetaSEAL or gutta-percha/AH Plus sealer using either a single-cone technique or warm vertical compaction (n = 10). The roots were sectioned at the coronal and middle thirds to obtain thin slices, which were subjected to compressive loading to displace the set sealer/filling toward the coronal side of the slice. The remaining six teeth were filled with gutta-percha/MetaSEAL and cryofractured for scanning electron microscopic examination. The push-out strength of AH Plus was significantly higher than MetaSEAL irrespective of filling techniques (p < 0.05). A minimal hybrid layer was seen in radicular dentin, and resin tags were inconsistently identified from canal walls in the MetaSEAL-filled canals. The lower dislocation resistance in MetaSEAL-filled canals challenges the use of a self-adhesive bonding mechanism to create continuous bonds inside root canals.
Department of Endodontics, School of Dentistry, Medical College of Georgia, Augusta, Georgia 30912-1129, USA.
Matthew S
MS
Lawson
Bethany
B
Loushine
Sui
S
Mai
R Norman
RN
Weller
David H
DH
Pashley
Franklin R
FR
Tay
Robert J
RJ
Loushine
D000180:Acrylic Resins; D001840:Dental Bonding; D003799:Dental Stress Analysis; D004853:Epoxy Resins; D006801:Humans; D007180:Incisor; D008689:Methacrylates; D008855:Microscopy, Electron, Scanning; D019233:Retreatment; D012387:Root Canal Filling Materials; D012389:Root Canal Obturation / Q000379:methods*; D018709:Statistics, Nonparametric
D000180:Acrylic Resins; D004853:Epoxy Resins; D008689:Methacrylates; D012387:Root Canal Filling Materials; C534916:epoxy resin-based root canal sealer; C031172:4-META resin