Sealing performance and wear resistance of new resin/glass ionomer formulations in class V cavities

ABSTRACT

The purpose of this in vitro study was to investigate the sealing performance [microleakage] of different glass ionomer formulations and to measure their wear rate. For microleakage assessment, a total of 120 class V cavities were prepared in upper and lower premolars and were used in this investigation. The cavities were divided into two main groups according to the location of the cervical margin. In group I The cervical margin of the cavity was located 0.5 mm above the cement-enamel junction. In group II The cervical margin was located 0.5 mm below the cemtno-enamel junction. Each group was further subdivided into three subgroups A, B, and C [20 each] according to the restorative material used. A resin modified glass ionomer [Vitremer], a polyacid modified resin composite [F2000], and a giomer restorative filling material [beautifil] were used. Each of the previous subgroups was again subdivided into two groups [10 each]. In groups A+, B+, and C+, the restored specimens were subjected to mechanical load cycling and thermal fluctuation before microleakage assessment. In groups A-, B-, and C-, microleakage assessment was carried out 24 hours after immersing the restored teeth in distilled water at room temperature. For wear determination a total of 15 cylindrical specimens were prepared, a two-body abrasion machine was used and the wear data were deducted to calculate the wear rate in gm/sec