[Use of light-curing composite and adhesive systems for the cementation of tranlucent fiber posts. SEM analysis and pull-out test].
OBJECTIVE
The purpose of this study was to compare 2 different techniques for the cementation of translucent fiber posts. The comparison was carried out by means of tensile bond strength testing and SEM evaluation of the interfaces morphology post/cement and cement/dentin.


METHODS
Twenty upper central extracted incisors were first endodontically treated and then randomly divided into 2 groups of 10 samples each. Twenty translucent Endo Light-posts (RTD) were cemented following 2 different


METHODS
In Group 1 Excite (Ivoclar Vivadent) and Tetric Flow (Ivoclar Vivadent) were applied and light-cured. In Group 2: All Bond 2 (Bisco) and RelyX ARC (3M) were applied, light-cured and then self-cured. A tensile bond strength test was carried out on 14 roots, 7 from each group. Subsequently, 2 roots were cut lengthwise and observed using a SEM. The remaining 6 roots (3 from each group) were cut into 5 transversal sections and observed using a SEM. The tensile force required to dislodge the cemented posts from the 7 roots of each group was recorded by means of a testing machine.


RESULTS
Group 1 revealed a bonding strength which was slightly inferior to the bonding strength registered in Group 2. SEM evaluation showed a good quality of bond. Without taking into account the curing method used, the polymerization carried out by means of light curing seems to result in a better adaptation of cement.


CONCLUSIONS
Self curing cement still represents the most reliable alternative, even if photo-curing cement might guarantee a most efficient stress distribution along the walls of the canal.
Giachetti
L
L
Dipartimento di Odontostomatologia, Università degli Studi di Firenze, Firenze, Italy. l.gianchetti@odonto.unifi.it
Scaminaci Russo
D
D
Bertini
F
F
D017438:Bisphenol A-Glycidyl Methacrylate; D002484:Cementation / Q000379:methods*; D003188:Composite Resins; D001840:Dental Bonding / Q000379:methods*; D003793:Dental Restoration, Permanent; D006801:Humans; D008027:Light; D008422:Materials Testing; D008689:Methacrylates; D008855:Microscopy, Electron, Scanning; D011092:Polyethylene Glycols; D011109:Polymethacrylic Acids
C409386:Bisco Glaze; D003188:Composite Resins; C420130:Excite cement; D008689:Methacrylates; D011109:Polymethacrylic Acids; C462240:RelyX ARC; C452226:tetric flow composite resin; D011092:Polyethylene Glycols; D017438:Bisphenol A-Glycidyl Methacrylate