Effect of Two Lining Procedures on the Marginal Integrity of Compound Posterior Direct Resin Composite Restoration
Nehal Hamdi Mohammed Ali;
Abstract
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 adhesiveflowable 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.
The selected teeth were embedded in cylindrical auto-polymerizedacrylic resin block. Standardized simple box class II occluso-mesial (OM) cavities were prepared in the selected maxillary premolars. The depth of all prepared cavities was adjusted to be 3mm while thebuccco-lingual width was 4mm.According to manufacturer's instructions the self adhesiveflowable liner was applied on the axial and pulpal walls in the thickness of 1 mm increment then agitated with tips or brush (ivoclarvivadent) for 20 seconds, then The flowable composite liner were light cured for 10 seconds using LED curing unit.The resin modified glass ionomer liner was applied according to manufacturer's instruction. According to the manufacturer instructions, etch and rinse adhesive was applied and cured with the same light curing unit for 20 seconds. Standardized Tofflemire matrix holderwithNo. 1 metal matrix band was applied before resin composite packing.the resin composite was packed by oblique incremental technique so maximum thick of each increment was 2 mm & ended with feather edge at the occlusal surface then light cured followed by the second increment (2mm) till the occlusalcavo-surface margin and light cured for another 20 seconds.The restored teeth was finished using 15µm grit compo-shape finishing diamond burs then polished using finishing discs.
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 adhesiveflowable 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.
The selected teeth were embedded in cylindrical auto-polymerizedacrylic resin block. Standardized simple box class II occluso-mesial (OM) cavities were prepared in the selected maxillary premolars. The depth of all prepared cavities was adjusted to be 3mm while thebuccco-lingual width was 4mm.According to manufacturer's instructions the self adhesiveflowable liner was applied on the axial and pulpal walls in the thickness of 1 mm increment then agitated with tips or brush (ivoclarvivadent) for 20 seconds, then The flowable composite liner were light cured for 10 seconds using LED curing unit.The resin modified glass ionomer liner was applied according to manufacturer's instruction. According to the manufacturer instructions, etch and rinse adhesive was applied and cured with the same light curing unit for 20 seconds. Standardized Tofflemire matrix holderwithNo. 1 metal matrix band was applied before resin composite packing.the resin composite was packed by oblique incremental technique so maximum thick of each increment was 2 mm & ended with feather edge at the occlusal surface then light cured followed by the second increment (2mm) till the occlusalcavo-surface margin and light cured for another 20 seconds.The restored teeth was finished using 15µm grit compo-shape finishing diamond burs then polished using finishing discs.
Other data
| Title | Effect of Two Lining Procedures on the Marginal Integrity of Compound Posterior Direct Resin Composite Restoration | Other Titles | تاثير طريقتين للتبطين على التماسك الحافي لترميمات الكومبوزيت الراتنجية المركبة المباشرة الخلفية | Authors | Nehal Hamdi Mohammed Ali | Issue Date | 2016 |
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