مقایسه آزمایشگاهی تأثیر انواع لاینرهای ادهزیو بر روی ریزنشت دیواره سرویکال (عاج- سمنتوم) ترمیم‌های کلاس  کامپازیت

  Objectives: The purpose of this study was to investigate the microleakage at cervical margins of class V composite restorations with thickened no filled adhesive, flowable composite, filled adhesive and glass- ionomer liners (light cured, conventional).   Materials & Methods: Thirty recently extracted human molars were prepared with standardized class V cavities of 5mm length (mesial- distal x 2mm width (occlusal- gingival), and 1.5mm depth with cervical margins located 1.5mm under CEJ on the buccal and lingual surfaces. The cavities were randomly assigned into 6 groups (n= 10) group 1-SBMP +Filtek Z250 (control) group 2 – SBMP +2 layer of adhesive of SBMP located only on the gingival wall (3 layers) + Filtek Z250 group 3- SBMP + filled adhesive (PQ1)1 layer located only on the gingival wall + Filtek Z250 group 4 – SBMP + Filtek Flow 1 layer located only on the gingival wall (0.5mm) + Filtek Z250 group 5 – Fuji II LC (1 layer only on the gingival wall with 0.5mm thickness) + SBMP + Filtek Z250 and group 6 –Fuji II LC (1 layer only on the gingival wall with 0.5mm thickness) + SBMP + Filtek Z250. After immersion in tap water for 24h, the specimens were thermocycled (500X 5- 55 c, 30 sec dwell time) and then immersed in a 0.5% basic fuchsine solution for 24h. The restorations were sectioned longitudinally at buccolingual direction and were observed under the stereo-microscope at 40x magnification and extent of dye penetration was assesd according to ISO TR 11405, 2003. Data was subjected to the Kruskal –Wallis and Mann- Withney U test (p<0.05).   Results: groups III, V and VI showed lesser microleakage than group I (p0.05).   Conclusion: This study showed that any of used methods could not completely eliminate the cervical microleakag, but glaas-ionomer liners and filled adhesive could reduce the cervical microleakage.