An in vitro comparative evaluation of microleakage in open sandwich technique in Class V restoration (A dye penetration study)


Background: The purpose of this in vitro study was to compare the microleakage at dentin margins of class V cavitiesfilled with compomer alone and compomer lined with conventional glass ionomer cement or resin modified glassionomer cement.Materials and Methods: fifteen recently extracted human premolars were prepared with standardized box shapedclass V cavities of 3.0 mm (mesial-distal), 2.0 mm (occlusal-gingival), and 2.0 mm depth with margins located onenamel and dentin/cementum on the buccal or lingual surfaces. The cavities were randomly assignedinto threegroups (n=10): Group I –compomer Dyract extraDetsply DetryGmbH (control); Group II – compomer DyractextraDetsply DetryGmbH lined with conventional GIC (promedica Medifil). Group III – compomer Dyract extraDetsply DetryGmbH lined with RMGIC (3M ESPE Vtrebond). After being immersed in tap water for 24 h, the specimenswere thermocycled (500 cycles, 5°-55°C, 30 sec dwell time) and immersed in a 0.5% basic fuchsine solution for 24 h.The restorations were sectioned longitudinally and gingival margins were evaluated for microleakage using a 0-4scale. Data were subjected to the Kruskal-Wallis test and Mann-Whitney U tests at p<0.05.Results: a statistically significant difference among groups was observed. The RMGIC show the less gingivalmicroleakage while the conventional GIC show the most microleakage.Conclusion: The use of a RMGIC liner under composite in open sandwich technique minimizes the gingival microleakage, while the conventional GIC exhited the contrary.