Effect of cement type and water storage time on the push-out bond strength of a glass fiber post.
This study investigated the effects of the cement type and the water storage time on the push-out bond strength of a glass fiber post. Glass fiber posts (Fibrekor, Jeneric Pentron) were luted to post spaces using a self-cured resin cement (C&B Cement [CB]), a glass ionomer cement (Ketac Cem [KC]) or a resin-modified glass ionomer cement (GC FujiCEM [FC]) according to the manufacturers' instructions. For each luting agent, the specimens were exposed to one of the following water storage times (n=5): 1 day (T1), 7 days (T7), 90 days (T90) and 180 days (T180). Push-out tests were performed after the storage times. Control specimens were not exposed to water storage, but subjected to the push-out test 10 min after post cementation. Data (in MPa) were analyzed by Kruskal-Wallis and Dunn`s test (α=0.05). Cement type and water storage time had a significant effect (p<0.05) on the push-out bond strength. CB showed significantly higher values of retention (p<0.05) than KC and FC, irrespective of the water storage time. Water storage increased significantly the push-out bond strength in T7 and T90, regardless of the cement type (p<0.05). The results showed that fiber posts luted to post spaces with the self-cured resin cement exhibited the best bonding performance throughout the 180-day water storage period. All cements exhibited a tendency to increase the bond strength after 7 and 90 days of water storage, decreasing thereafter.
Department of Prosthodontics, Dental School, Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil. katiarreis@yahoo.com.br
Kátia Rodrigues
KR
Reis
George Miguel
GM
Spyrides
Jonas Alves de
JA
Oliveira
Alexandre Abrão
AA
Jnoub
Kátia Regina Hostilio Cervantes
KR
Dias
Gerson
G
Bonfantes
D000042:Absorption; D000327:Adsorption; D001896:Boron Compounds / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry; D001840:Dental Bonding; D003738:Dental Cements / Q000737:chemistry* / Q000145:classification; D003786:Dental Pulp Cavity / Q000033:anatomy & histology; D003804:Dentin / Q000033:anatomy & histology; D005898:Glass / Q000737:chemistry*; D005899:Glass Ionomer Cements / Q000737:chemistry; D006801:Humans; D008277:Magnesium Oxide / Q000737:chemistry; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D008768:Methylmethacrylates / Q000737:chemistry; D011076:Polycarboxylate Cement / Q000737:chemistry; D011176:Post and Core Technique / Q000295:instrumentation*; D019279:Resin Cements / Q000737:chemistry; D018915:Root Canal Preparation / Q000379:methods; D013314:Stress, Mechanical; D013997:Time Factors; D014867:Water / Q000737:chemistry*; D015034:Zinc Oxide / Q000737:chemistry
D001896:Boron Compounds; D003188:Composite Resins; D003738:Dental Cements; C113550:FiberKor, sculpture; C542393:FujiCEM; D005899:Glass Ionomer Cements; D008689:Methacrylates; D008768:Methylmethacrylates; D011076:Polycarboxylate Cement; D019279:Resin Cements; C009753:fiberglass; D014867:Water; D008277:Magnesium Oxide; C040235:Ketac-cem; C049495:Super-bond; D015034:Zinc Oxide