Addition of fresh amalgam to existing amalgam utilizing various adhesive liners: a SEM study.
The purpose of this study was to observe the interfaces between (1) dentin and amalgam and (2) freshly placed amalgam and existing amalgam using various adhesive liners. Specimens were randomly assigned to four equal groups for liner placement: Group I--control, no liner used; Group II--copal varnish; Group III--4-META adhesive; Group IV--dentin bonding agent. After liner placement and amalgam replacement, specimens set for 24 hours and were then thermocycled in 0.5% basic Fuchsin dye, sectioned, and SEM analyses performed. Microgaps appeared in a disjointed fashion at the interface between freshly placed and existing amalgam. The 4-META adhesive appeared to establish a bond between amalgam and tooth structure and, thus, diminished the microgap between amalgam and dentin.
Leelawat
C
C
New York University College of Dentistry.
Scherer
W
W
Chang
J
J
David
S
S
Schulman
A
A
D003188:Composite Resins; D003723:Dental Amalgam; D001840:Dental Bonding; D003736:Dental Cavity Lining; D003763:Dental Leakage / Q000517:prevention & control*; D003764:Dental Materials; D017269:Dental Prosthesis Repair; D003804:Dentin / Q000648:ultrastructure; D006801:Humans; D008689:Methacrylates; D008855:Microscopy, Electron, Scanning; D019279:Resin Cements; D012116:Resins, Plant
C070606:Amalgambond; C029849:Clearfil Bonding Agent; D003188:Composite Resins; D003764:Dental Materials; D008689:Methacrylates; D019279:Resin Cements; D012116:Resins, Plant; C023806:Copalite; D003723:Dental Amalgam