Influence of solvents on the bond strength of resin sealer to intraradicular dentin after retreatment.
This study evaluated the removal of filling material with ProTaper Universal Rotary Retreatment system (PTR) combined with solvents and the influence of solvents on the bond strength (PBS) of sealer to intraradicular dentin after canal reobturation. Roots were endodontically treated and distributed to five groups (n = 12). The control group was not retreated. In the four experimental groups, canals were retreated with PTR alone or in combination with xylol, orange oil, and eucalyptol. After filling material removal, two specimens of each group were analysed by SEM and µCT to verify the presence of filling remnants on root canal walls. The other roots were reobturated and sectioned in 1-mm-thick dentin slices that were subjected to the push-out test. Data were analysed by two-way ANOVA and Tukey's test (α = 0.05). SEM and µCT analysis revealed that all retreatment techniques left filling remnants on canal walls. The control group (3.47 ± 1.21) presented significantly higher (p < 0.05) PBS than the experimental groups. The groups retreated with PTR alone (2.59 ± 0.99) or combined with xylol (2.54 ± 0.77) and orange oil (2.32 ± 0.93) presented similar bond strength (p > 0.05), and differed significantly from the group with eucalyptol (1.89 ± 0.63). The solvents reduced the PBS of the sealer to dentin and no retreatment technique promoted complete removal of filling material.
Universidade de Ribeirão Preto, School of Dentistry, Ribeirão Preto, SP, Brazil.
Marcelo
M
Palhais
Universidade de São Paulo - USP, School of Dentistry of Ribeirão Preto, Ribeirão Preto, SP, Brazil.
Manoel Damião
MD
Sousa-Neto
Universidade de Ribeirão Preto, School of Dentistry, Ribeirão Preto, SP, Brazil.
Fuad Jacob Abi
FJ
Rached-Junior
Universidade de Ribeirão Preto, School of Dentistry, Ribeirão Preto, SP, Brazil.
Mariana Carvalho de Andrade
MC
Amaral
Universidade de Ribeirão Preto, School of Dentistry, Ribeirão Preto, SP, Brazil.
Edson
E
Alfredo
Universidade de Ribeirão Preto, School of Dentistry, Ribeirão Preto, SP, Brazil.
Carlos Eduardo Saraiva
CE
Miranda
Universidade de Ribeirão Preto, School of Dentistry, Ribeirão Preto, SP, Brazil.
Yara Teresinha Corrêa
YT
Silva-Sousa
D000704:Analysis of Variance; D003511:Cyclohexanols / Q000737:chemistry; D001840:Dental Bonding; D003762:Dental Instruments; D003786:Dental Pulp Cavity / Q000187:drug effects*; D003804:Dentin / Q000187:drug effects*; D004853:Epoxy Resins / Q000737:chemistry; D000077591:Eucalyptol; D006171:Gutta-Percha; D006801:Humans; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D039821:Monoterpenes / Q000737:chemistry; D010938:Plant Oils / Q000737:chemistry; D015203:Reproducibility of Results; D019233:Retreatment / Q000295:instrumentation; D012387:Root Canal Filling Materials / Q000737:chemistry*; D018915:Root Canal Preparation / Q000295:instrumentation / Q000379:methods*; D012997:Solvents / Q000737:chemistry*
D003511:Cyclohexanols; D004853:Epoxy Resins; D039821:Monoterpenes; D010938:Plant Oils; D012387:Root Canal Filling Materials; D012997:Solvents; C534916:epoxy resin-based root canal sealer; D006171:Gutta-Percha; C087245:orange oil; D000077591:Eucalyptol