Microleakage of a dental amalgam alloy bonding agent.
Amalgambond (a 4-META derivative resin bond agent) was evaluated for its effectiveness in reducing microleakage compared to copal varnish and no lining agent in class 5 amalgam preparations restored with either an admix alloy (Dispersalloy) or a spherical alloy (Tytin). Teeth were thermocycled between 5 and 55 degrees C with two 4-META/amalgam groups additionally aged in 37 degrees C water for 30 days prior to thermocycling. Nonaged, 4-META/amalgam restorations showed significantly less microleakage (P < 0.05) at enamel and dentin margins compared to copal varnish or nonlined restorations. Within the 4-META groups, the 4-META/Dispersalloy restorations had significantly less microleakage than the 4-META/Tytin restorations at enamel margins. Microleakage in the aged 4-META/amalgam restorations was significantly greater at both the enamel and dentin margins than in the analogous nonaged groups. SEM evaluation of the 4-META lined restorations found internal cavity surfaces of the preparations to be sealed by the resin liner with separations and apparent microleakage occurring at the 4-META/amalgam interface.
Saiku
J M
JM
Comprehensive Dentistry Program, National Naval Dental Center, Naval Dental School, Bethesda, MD 20889-5602.
St Germain
H A
HA
Meiers
J C
JC
D000704:Analysis of Variance; D003722:Dental Alloys; D003723:Dental Amalgam; D003736:Dental Cavity Lining; D003763:Dental Leakage / Q000517:prevention & control*; D003764:Dental Materials; D017220:Dentin-Bonding Agents; D006801:Humans; D008689:Methacrylates; D008855:Microscopy, Electron, Scanning; D012116:Resins, Plant
C070606:Amalgambond; D003722:Dental Alloys; D003764:Dental Materials; D017220:Dentin-Bonding Agents; D008689:Methacrylates; D012116:Resins, Plant; C023806:Copalite; C033470:Dispersalloy; C036886:tytin; D003723:Dental Amalgam