Bonding ability of 4-META self-etching primer used with 4-META/MMA-TBB resin to enamel and dentine: primary vs permanent teeth.
OBJECTIVE
The present study compared the efficacies of the self-etching Teeth Primer (TP: 4-META), and the etchants Red Activator (RA; 65% phosphoric acid) and Green Activator (GA; 10% citric acid with 3% ferric chloride), for bonding to enamel and dentine of human primary and permanent teeth, when used with 4-META/MMA-TBB resin (Bondfill SB).


METHODS
Forty-eight non-carious primary canines and third molars were used. Eight groups were prepared: Group 1 (primary enamel with RA), Group 2 (permanent enamel with RA), Group 3 (primary enamel with TP), Group 4 (permanent enamel with TP), Group 5 (primary dentine with GA), Group 6 (permanent dentine with GA), Group 7 (primary dentine with TP) and Group 8 (permanent dentine with TP). Micro-tensile bond strengths (MTBS) were measured and analyzed statistically using ANOVAs and Tukey HSD tests at α=0.05. Efficacy of etching/priming and the morphology of bonded interfaces were observed with SEM.


RESULTS
Etching/priming efficacy of TP on enamel was low. The MTBS of Group 2 was significantly higher than the other groups (Groups 1, 3 and 4). For dentine, significant differences in MTBS were observed, in the order of Groups 6>8>7=5 (p<0.05). The MTBSs of permanent dentine were significantly higher than primary dentine. For primary teeth, there was no significant difference in the MTBSs between enamel and dentine, irrespective of primer or etchant (p>0.05).


CONCLUSIONS
TP primer/Bondfill SB may be used as an alternative to other adhesive/resin composite systems for bonding to enamel and dentine of primary teeth.
Department of Pediatric Dentistry, Course of Medical and Dental Science, Nagasaki University Graduate School of Biomedical Sciences, 1-7-1, Sakamoto, Nagasaki 852-8588, Japan. Electronic address: hosoya@nagasaki-u.ac.jp.
Yumiko
Y
Hosoya
Department of Endodontics, College of Dental Medicine, Georgia Regents University, Augusta, GA 30912-1129, USA.
Franklin R
FR
Tay
D000134:Acid Etching, Dental / Q000379:methods; D001896:Boron Compounds / Q000737:chemistry*; D002712:Chlorides / Q000737:chemistry; D019343:Citric Acid / Q000737:chemistry; D001840:Dental Bonding; D003743:Dental Enamel / Q000648:ultrastructure*; D003804:Dentin / Q000648:ultrastructure*; D005290:Ferric Compounds / Q000737:chemistry; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry*; D020366:Methylmethacrylate / Q000737:chemistry; D008768:Methylmethacrylates / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D010756:Phosphoric Acids / Q000737:chemistry; D019904:Polymethyl Methacrylate / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry*; D013314:Stress, Mechanical; D013499:Surface Properties; D013718:Tensile Strength; D014094:Tooth, Deciduous / Q000648:ultrastructure*
D001896:Boron Compounds; D002712:Chlorides; D005290:Ferric Compounds; D008689:Methacrylates; D008768:Methylmethacrylates; D010756:Phosphoric Acids; D019279:Resin Cements; D020366:Methylmethacrylate; D019343:Citric Acid; C034139:4-methacryloxyethyltrimellitic acid anhydride; D019904:Polymethyl Methacrylate; C049495:Super-bond; C030242:phosphoric acid; C024555:ferric chloride
4-META self-etching primer; 4-META/MMA-TBB resin; Micro-tensile bond strength; Permanent teeth; Primary teeth; Scanning electron microscopy