Bonding durability of photocured phenyl-P in TEGDMA to smear layer-retained bovine dentin.
The long-term durability of a photocured resin bond to ground bovine dentin with its smear layer retained was investigated. The bonding resin that was employed was composed of 5.0 wt% 2-(methacryloxy)ethyl phenyl hydrogen phosphate (phenyl-P) as a diffusion-promoting monomer, 0.5 wt% camphorquinone as a photosensitizer, and 0.5 wt% N-phenylglycine as a reducing agent in triethyleneglycol dimethacrylate. Following polymerization of the bonding resin, a composite resin was placed and photocured for 60 seconds. Prepared specimens were stored in 37 degrees C water for 1 day, 6 months, and 1 year. Measured tensile bond strengths were 6.7 MPa after 1 day of storage, 4.1 MPa after 6 months of storage, and 2.8 mPa after 1 year of storage. Examinations of the interfaces after fracture under tensile loading suggested that long-term water-immersion weakened the bonds between the photocured adhesive resin and the smear layer-retained dentin because there was insufficient diffusion of the adhesive resin through the retained smear layer.
Watanabe
I
I
Division of Organic Materials, Institute for Medical and Dental Engineering, Tokyo Medical and Dental University, Japan.
Nakabayashi
N
N
D000818:Animals; D002417:Cattle; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding; D003804:Dentin / Q000648:ultrastructure; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D005998:Glycine / Q000031:analogs & derivatives / Q000737:chemistry; D008689:Methacrylates / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D009943:Organophosphorus Compounds / Q000737:chemistry*; D011092:Polyethylene Glycols / Q000737:chemistry*; D011109:Polymethacrylic Acids / Q000737:chemistry*; D016369:Smear Layer; D013718:Tensile Strength
D003188:Composite Resins; D017220:Dentin-Bonding Agents; D008689:Methacrylates; D009943:Organophosphorus Compounds; C074232:Phenyl-P adhesion promoting monomer; D011109:Polymethacrylic Acids; C020946:triethylene glycol dimethacrylate; C021316:N-phenylglycine; D011092:Polyethylene Glycols; D005998:Glycine