Effect of two lining procedures on the marginal integrity of compound posterior direct resin composite restoration / Nehal Hamdi Mohammed Ali ; Supervised Mohsen Hussein Abi-Elhassan , Mohamed Fouad Haridy

Thesis (M.Sc.) - Cairo University - Faculty of Oral and Dental Medicine - Department of Operative Dentistry

Main principle in restorative dentistry states that the transition between the restorative material and the dental hard tissue must be continuous to increase the survival probability of the restoration. One of the most important problems of restorative dentistry today is the failure at tooth- restoration interface due to failure of bonding to enamel and dentin, causing marginal leakage (Yavuz et al, 2009). This study was carried out to investigate the use of new self- adhesive flowable composite as a liner under resin composite restorations and compare it to glass ionomer liner. As well as the assessment of ultra-morphological examination of tooth- restoration interface using scanning electron microscopy (SEM). Forty-two freshly extracted maxillary human premolars were used. The selected teeth were randomly divided into three main groups (14 each) according to the liner used either no liner (Control group); self adhesive flowable composite or resin modified glass ionomer liner. Each group was subdivided into two subgroups (7 each) according to the testing periods either immediate after composite placement or three months later. Five specimens of each subgroup were tested for microleakage by dye penetration method and two specimens were evaluated using scanning electron microscope SEM

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