The purpose of this study was to evaluate the marginal microleakage of condensable composite resin restorations according to flowable resin lining of internal cavity wall.
The sixty extracted human molar teeth without caries and/or restorations are used. The experimental teeth were randomly assigned into three groups of ten teeth each. The conventional class II cavities (box-shaped on mesial and distal surface, faciolingual width : 3mm, gingival wall depth 1.5mm ) were prepared 1mm below cementoenamel junction with a # 701 carbide bur.
The teeth were divided into three groups, and then each group were subdevided into A & B group according to flowable resin & compomer lining ; Group 1-A : Ariston pHc filling, Group 1-B : Tetric Flow lining and Ariston pHc filling, Group 2-A : SureFil Filling, Group 2-B : Dyract Flow lining and SureFil filling, Group 3-A : Pyramid filling, Group3-B : Aeliteflo lining and Pyramid filling. All the materials used were applied according to the manufacturers' instructions. The specimens were stored in the 100% humidity for 7 days prior to thermocycling (100 thermal cycles of 5-55℃ water with a 30-seconds dwell time). The specimens were immersed in 2% metyleneblue dye for 24 hours, and then embedded in transparent acrylic resin and sectioned mesiodistally with diamond wheel saw. The degree of marginal leakage as scored under stereomicroscope (x20) and the data were analyzed by Kruskal-Wallis test and Wilcoxon signed ranks test.
The results were as follows :
1. In the gingival margins of all the group, microleakage of subgroup B were was less than subgroup A.
2. In the group 1, 3 there was significant differences between subgroup A and B (p<0.05), but there was not significant different between group 2-A(SureFil) and group 2-B (Dyract flow/SureFil) (p>0.05).
3. From the results above, it was suggested that the cavity lining of flowable resin and flowable compomer in condensable resin restoration decrease microleakage at gingival margin, and does improve their ability to seal the gingival margin of class II preparation.
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