Effects of adhesive composite core systems on adaptation of adhesive post and cores under load.
OBJECTIVE
To test marginal and internal adaptation of five different adhesive composite core systems under load.


METHODS
30 human premolars were endodontically prepared and obturated with an epoxy sealer and vertically condensed gutta-percha. Thereafter the entire clinical crown was removed. The teeth were randomly assigned to five different composite core groups, all using the same fiber reinforced radicular post (DT White). Gr. 1: Optibond solo plus/Nexus II/Prodigy; Gr. 2: Scotchbond 1/Rely X Arc/Filtek P60; Gr. 3: EBS multi/Compolute applicap/Pertac II; Gr. 4: ART Bond/Parapost cement/Synergy; Gr. 5: Superbond C&B catalyst S+polymer/Metafil CX. Polyvinyl-siloxane impressions of the external margins of the cores were readied before and after 1,200,000 cycles of mechanical loading with max. 100 N at 45 degrees to the longitudinal axis of the tooth. After loading, 5 of the 6 samples of each group were cut longitudinally and the sixth sample was cut transversally to be able to take replicas for evaluation of internal adaptation after loading.


RESULTS
Percentages of external "continuous margins" ranged from 97.9+-4.6 to 66.5+-7.8 before and from 87.4+-25.0 to 5.8+-12.5 after loading. Internal adaptation ranged from 96.4+-8.0 to 17.1+-20.4 after loading for the core adaptation and from 89.8+-12.2 to 65.9+-14.3 for the dentin-luting composite interface and from 99.4+-1.2 to 88.6+-9.4 for the composite-post interface.


CONCLUSIONS
Surprisingly, the best materials' combination for the adhesive composite core was a self-etch light cured adhesive with a chemically cured luting agent.
Duc
Olivier
O
School of Dentistry, University of Geneva, Rue Barthélemy-Menn 19, CH-1205 Geneva, Switzerland.
Krejci
Ivo
I
D003487:Cyanoacrylates / Q000737:chemistry; D001840:Dental Bonding / Q000379:methods*; D018772:Dental Marginal Adaptation; D003764:Dental Materials / Q000737:chemistry*; D003799:Dental Stress Analysis; D006801:Humans; D008298:Maleates / Q000737:chemistry; D008689:Methacrylates / Q000737:chemistry; D010756:Phosphoric Acids / Q000737:chemistry; D011176:Post and Core Technique; D019279:Resin Cements / Q000737:chemistry*; D019553:Tooth, Nonvital; D016474:Weight-Bearing
C088247:ART Bond; D003487:Cyanoacrylates; D003764:Dental Materials; C113072:EBS adhesive system; D008298:Maleates; D008689:Methacrylates; C451600:OptiBond Solo Plus; D010756:Phosphoric Acids; D019279:Resin Cements; C538957:Super Bonder Instant Adhesive; C041330:Scotchbond