title: Effect of different surface treatments on the repair strength of a nanofilled resin-based composite.
abstract: The purpose of our study was to re-evaluate the effects of surface treatment on the bond strength of repaired methacrylate-based dental composite materials including nanofillers (Ceram X, Dentsply). The microtensile bond strengths were measured before or after thermo-mechanical fatigue simulation. The treatments were as follows: (1)No treatment (negative control), (2)Bonding agent, (3) Acetone, (4)Acetone+Bonding agent, (5)Silane, (6)Silane+Bonding agent. In the digitized SEM image of the polished aged specimens without any surface treatment, the percentage of the visible fillers relative to the whole image was calculated. Before and after fatigue, no significant differences could be observed among the different pretreatment groups. Fatigue increased the microtensile strength values of Acetone and Silane groups. The digitized SEM image reveals that 11.5% of the exposed surface could be identified as uncovered filler surface. None of surface treatments (acetone, silane and bonding agent) contributed to increase the tensile strength of repaired composite samples including nanofillers.
authors.affiliation: Division of Removable Prosthetics, Department of Oral and Maxillofacial Rehabilitation, Kanagawa Dental College, 82 Inaoka-cho, Yokosuka-shi, Kanagawa, Japan. hamano@kdcnet.ac.jp
authors.forename: Naho
authors.initials: N
authors.lastname: Hamano
authors.forename: Yu-Chih
authors.initials: YC
authors.lastname: Chiang
authors.forename: Indra
authors.initials: I
authors.lastname: Nyamaa
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Yamaguchi
authors.forename: Satoshi
authors.initials: S
authors.lastname: Ino
authors.forename: Reinhard
authors.initials: R
authors.lastname: Hickel
authors.forename: Karl-Heinz
authors.initials: KH
authors.lastname: Kunzelmann
mesh_terms: D000096:Acetone / Q000737:chemistry; D000178:Acrylamides / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding; D003764:Dental Materials / Q000737:chemistry*; D003775:Dental Polishing; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D053761:Nanocomposites / Q000737:chemistry*; D012821:Silanes / Q000737:chemistry; D013314:Stress, Mechanical; D013499:Surface Properties; D013696:Temperature; D013718:Tensile Strength; D013997:Time Factors; D014867:Water / Q000737:chemistry
chemical_list: D000178:Acrylamides; C520091:CeramX; D003188:Composite Resins; D003764:Dental Materials; D008689:Methacrylates; D012821:Silanes; D014867:Water; D000096:Acetone; C017492:methacryloxypropyltrimethoxysilane