Laboratory evaluation of three visible light-cured resinous liners.
OBJECTIVE
The aim of the present study was to evaluate the composition and the laboratory performance of three visible light-cured resinous liners (Cavalite, Ionoseal and Timeline).


METHODS
Monomers were separated from fillers and were analysed by HPLC. Set pastes were analysed by FTIR spectroscopy and diametral strengths and water solubility were measured.


RESULTS
The monomers identified in the liners were BisEMA/2-HEMA (Cavalite), BisDMA/BisGMA (Ionoseal) and UEDMA (Timeline). Significant variations were found in the filler content but the mechanical response as assessed by the diametral tensile strength showed no statistical differences. The curing efficiency ranged from 24.2 to 31.0% (top surfaces) to 26.0-54.0% (bottom surfaces) of remaining C = C bonds. No positive correlations were found between curing efficiency and optical properties. The bond strength of the liners to dentine was negligible compared with that to composite. All the liners demonstrated extensive gap formation and debonding at the liner-dentine interfaces in marginal adaptation testing. Statistical differences were noticed in the water absorption and water solubility values of the products. Ionoseal showed extensive hydrolytic degradation compared with the other liners. No evidence of acid-base reaction was found in the set products.
Kakaboura
A I
AI
Research Center for Biomaterials, Athens, Greece.
Eliades
G C
GC
Palaghias
G
G
D000180:Acrylic Resins / Q000032:analysis / Q000737:chemistry*; D000538:Aluminum Silicates / Q000032:analysis / Q000737:chemistry*; D017438:Bisphenol A-Glycidyl Methacrylate / Q000032:analysis; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D002851:Chromatography, High Pressure Liquid; D003188:Composite Resins / Q000032:analysis / Q000737:chemistry; D003736:Dental Cavity Lining; D017220:Dentin-Bonding Agents / Q000032:analysis / Q000737:chemistry*; D005069:Evaluation Studies as Topic; D006882:Hydroxyapatites / Q000032:analysis / Q000737:chemistry*; D008689:Methacrylates / Q000032:analysis / Q000737:chemistry; D011140:Polyurethanes / Q000737:chemistry; D012823:Silicate Cement / Q000032:analysis / Q000737:chemistry*; D012822:Silicon Dioxide / Q000032:analysis / Q000737:chemistry*; D012969:Sodium Fluoride / Q000032:analysis / Q000737:chemistry*; D012995:Solubility; D017550:Spectroscopy, Fourier Transform Infrared; D013314:Stress, Mechanical; D013718:Tensile Strength; D014520:Urethane / Q000031:analogs & derivatives* / Q000032:analysis / Q000737:chemistry; D014867:Water
D000180:Acrylic Resins; D000538:Aluminum Silicates; D003188:Composite Resins; D017220:Dentin-Bonding Agents; D006882:Hydroxyapatites; C093696:Ionoseal; D008689:Methacrylates; D011140:Polyurethanes; C069856:TimeLine; D014867:Water; C029824:urethane dimethacrylate luting resin; D012823:Silicate Cement; C041979:2,2-bis-(4-(2-methacryloxyethoxy)phenyl)propane; D014520:Urethane; D017438:Bisphenol A-Glycidyl Methacrylate; C005044:hydroxyethyl methacrylate; D012822:Silicon Dioxide; D012969:Sodium Fluoride; C061123:Cavalite