Microleakage in combined amalgam/composite resin restorations in MOD cavities|
Tolidis, Kosmas; Boutsiouki, Christina & Gerasimou, Paris
Aim: To compare marginal seal at tooth-material and material-material interfaces in the proximal
box in combined amalgam/composite resin restorations.
Methods: Mesio-occlusal-distal (MOD)
cavities were prepared in 35 premolars and permanent molars with carbide bur. The distal
proximal box was restored with amalgam (Permite, SDI) until reaching the height of pulpal floor.
Dental tissues were etched with 37% acid and a bonding agent (Bond 1-SF, Pentron) was
applied and cured. Composite resin (Filtek Z250, 3M-ESPE) was placed in layers in the mesial
proximal box and occlusally, and light cured. Marginal adaptation was evaluated at the following
interfaces: amalgam-tooth (A), amalgam-composite resin (AC) and composite resin-tooth (C).
Microleakage was evaluated by means of methylene blue infiltration after 7-day water storage
and thermocycling regimen (1500 cycles). Microleakage was assessed as percentage depth of
horizontal dye penetration.
Results: ANOVA showed statistically significant difference between
A-AC and A-C (p<0.01). No statistically significant difference was found between AC-C interfaces
(p>0.05). Mean microleakage values were A (73.529/28.71), AC (34.118/34.6) and C (40.435/
34.965), according to Tukey’s test. ,
Conclusions: Although the bonding mechanism between
amalgam and composite has not yet been completely explained, amalgam/composite resin
interface exhibited the lowest microleakage scores. Since amalgam/composite resin restorations
exhibited lower microleakage scores than composite resin on the cervical surface, combined
restorations can be considered as a biological and aesthetic alternative to conventional Class II
composite or amalgam restorations.
combined restorations, amalgam-composite, microleakage, class II cavity, MOD cavity