Effect of surface conditioning techniques on the resistance of resin composite core materials on titanium posts.
OBJECTIVE
This study evaluated the resistance of various post and core materials against torsional forces on differently conditioned titanium posts.


METHODS
One hundred fifty pure titanium posts (DIN 17850-Ti4/3.7065) were conditioned utilizing Silicoater Classical, Silicoater MD, Rocatec, Kevloc, and Siloc. Subsequently, three post and core materials (Adaptic, Coradent, Ti-Core) were applied to titanium posts that were previously coated with a light-cured opaquer (Dentacolor). Thirty sandblasted titanium posts were used as reference for each core material. Following thermocycling (5 degrees C to 55 degrees C, for 30 seconds or 5,000 cycles), maximum torsional forces were determined with an electronic torque movement key.


RESULTS
Kruskal-Wallis, Mann-Whitney U-tests indicated significant differences between Adaptic, Coradent, Ti-Core (20.9 dNm, 18.84 dNm, and 18.62 dNm, respectively). There were no significant differences between Silicoater Classical (18.56 dNm), Silicoater MD (18.18 dNm), and Rocatec (16.95 dNm), while Siloc exhibited the highest results (20.44 dNm). Kevloc demonstrated significantly lower results (10.43 dNm) than those of other systems and the control group (14.49 dNm).


CONCLUSIONS
Resistance of core materials against torsional forces on titanium posts increased with the use of chemical surface conditioning techniques, while the system using only acrylization did not improve the resistance in comparison to the unconditioned posts.
Akişli
Ismail
I
University of Hamburg, Dental School, Department of Operative Dentistry and Periodontology, Hamburg, Germany.
Ozcan
Mutlu
M
Nergiz
Ibrahim
I
D000181:Acrylonitrile / Q000031:analogs & derivatives*; D017438:Bisphenol A-Glycidyl Methacrylate; D020099:Coated Materials, Biocompatible; D003188:Composite Resins; D001840:Dental Bonding; D003738:Dental Cements; D003799:Dental Stress Analysis; D006571:Heterocyclic Compounds; D008422:Materials Testing; D008689:Methacrylates; D011176:Post and Core Technique; D019279:Resin Cements; D012821:Silanes; D012823:Silicate Cement; D018709:Statistics, Nonparametric; D013499:Surface Properties; D014025:Titanium; D019415:Torque
D020099:Coated Materials, Biocompatible; D003188:Composite Resins; C400043:Coradent; D003738:Dental Cements; D006571:Heterocyclic Compounds; D008689:Methacrylates; D019279:Resin Cements; C076811:Rocatec; D012821:Silanes; C465121:Siloc; C112072:kevloc; D012823:Silicate Cement; C079578:Ti-Core composite resin; D017438:Bisphenol A-Glycidyl Methacrylate; C057365:Dentacolor; D014025:Titanium; D000181:Acrylonitrile