title: In vitro hydrolytic degradation of composite quartz fiber-post bonds created by hydrophilic silane couplings.
abstract: The hydrolytic stability of a pre-activated MPS silane (Monobond-S) and a 2-component 4-META/ gamma-MPTS silane (Porcelain Liner M) to H202-etched quartz fiber posts was investigated using a modeling approach. Composite build-ups around silanized posts were stored dry for 24 hours, stored in deionized water at 37 degrees C for 24 hours, 1 week, 1 month or they were thermocycled. Sectioned specimens were prepared for microtensile bond testing and SEM examination; 4-META/gamma-MPTS silane produced a rapid decline in bond strength after 1 week and 1 month of water storage and after thermocycling. This was not apparent in pre-activated MPS silane. SEM revealed debonding along the post-composite interfaces, which were coupled with 2-component silane. The use of a hydrophilic resin monomer (4-META) for on-demand hydrolysis of the gamma-MPTS silane expedited interfacial water sorption and hydrolytic degradation, which may be prevented with alternative coupling strategies.
authors.affiliation: Department of Restorative Dentistry and Dental Materials, Policlinico Le Scotte, University of Siena, Siena, Italy. francescamondti@hotmail.it
authors.forename: Francesca
authors.initials: F
authors.lastname: Monticelli
authors.forename: Raquel
authors.initials: R
authors.lastname: Osorio
authors.forename: Manuel
authors.initials: M
authors.lastname: Toledano
authors.forename: Franklin R
authors.initials: FR
authors.lastname: Tay
authors.forename: Marco
authors.initials: M
authors.lastname: Ferrari
mesh_terms: D003188:Composite Resins; D001840:Dental Bonding; D003738:Dental Cements; D003799:Dental Stress Analysis; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D006868:Hydrolysis; D008422:Materials Testing; D008689:Methacrylates; D011176:Post and Core Technique; D011791:Quartz; D012821:Silanes / Q000737:chemistry*; D013718:Tensile Strength; D017155:Wettability
chemical_list: D003188:Composite Resins; D003738:Dental Cements; D017220:Dentin-Bonding Agents; D008689:Methacrylates; C076808:Monobond S; D012821:Silanes; D011791:Quartz; C017492:methacryloxypropyltrimethoxysilane; C034139:4-methacryloxyethyltrimellitic acid anhydride