Liner and light exposure: effect on in-vitro Class V microleakage.
This in vitro study evaluated the influence of different glass ionomer liners and curing methods on microleakage of resin composite restorations. Class V root preparations were made in 120 bovine incisors randomly divided into 12 groups according to liner and curing method. The resin composite system (Single Bond + Z100) was inserted and polymerized in one increment in all groups. Cavity preparations were either not lined (control), lined with a resin modified glass-ionomer cement (Vitrebond) or a conventional glass-ionomer cement (Ketac Bond). The restorations were light-cured using one of four curing methods. The teeth were thermocycled and immersed in 0.5% basic fuchsin, sectioned, and dye penetration was measured (Image Tool). No significant difference in leakage among conventional, ramp or pulse-delay methods was seen. High intensity light groups showed significantly greater penetration compared to other curing methods. No significant difference existed in marginal leakage between liners, but microleakage was significantly higher in groups restored using no liner. No relationship between lining technique and light curing method was observed. The use of glass ionomer liners reduced microleakage, while high intensity light curing produced the greatest dye penetration.
Department of Operative Dentistry, Universidade do Sagrado Coração, Bauru, SP, Brazil.
Nádia da Rocha
Nda R
Svizero
Paulo Henrique Perlatti
PH
D'Alpino
Mário Honorato Júnior
MH
da Silva e Souza
Ricardo Marins
RM
de Carvalho
D000180:Acrylic Resins / Q000737:chemistry; D000818:Animals; D002417:Cattle; D003188:Composite Resins / Q000737:chemistry; D003763:Dental Leakage; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D005899:Glass Ionomer Cements / Q000737:chemistry*; D007180:Incisor / Q000187:drug effects; D008027:Light; D011140:Polyurethanes / Q000737:chemistry
D000180:Acrylic Resins; C029012:Composite Dental Resin; D003188:Composite Resins; D017220:Dentin-Bonding Agents; D005899:Glass Ionomer Cements; D011140:Polyurethanes; C061499:Ketac-Bond; C067790:Vitrabond