A Comparative Study between Bulk Fill and Incrementally Packed Composite Using Different Adhesive Systems
Nada Atef Ahmed Aboushady;
Abstract
This study was designed to evaluate the effect of different types of composites and adhesive systems on the color reproduction, marginal gap, and SBS to dentin before and after thermocyling.
Eighty freshly extracted premolar teeth for orthodontic reasons were collected and divided into two groups (n=40) according to the type of composite used (Incremental nano-hybrid and Bulk fill). Each group was later subdivided into two subgroups (n=20) according to the type of adhesive used (Total etch and Self-etch adhesive).
Four teeth from each subgroup underwent slot class II cavities in both mesial and distal surfaces of each premolar. Teeth were restored with the corresponding type of composite and adhesive for each subgroup according to manufacturer’s instructions.
Color parameters of each restoration were obtained using a Vita Easyshade spectrophotometer and marginal gap was assessed after the teeth were imaged using a digital microscope. Teeth were later subjected to 7500 thermal cycles between 5°C and 55°C and measured again for color and marginal gap. Color stability for each restoration was obtained by calculating theΔE values from the color parameters obtained.
Sixteen teeth from each subgroup were embedded into a resin block, and an isomet saw was used to cut the teeth to produce a flat dentin surface. All teeth were polished using 600-grit SiC paper to produce a standardized smear layer. Adhesive was applied to exposed dentin according to the manufacturer’s instructions and light cured. Composite was bonded to dentin using polyethylene transparent tubes having an internal diameter of 3mm and height of 4mm. Bulk-fill composite was placed in a single 4mm increment while microhybrid composite was inserted in two 2mm increments. SBS was tested using a universal testing machine by applying load at a crosshead speed of 0.5mm/min using a chisel. Half of the samples in each subgroup were tested after 24 hours of water storage, while the other half was tested after being subjected to 7500 thermal cycles between 5°C and 55°C. Data was analyzed using multivariate analysis of variance and tukey’s post-hoc test.
No significant results were found between subgroups regarding marginal gap. However, thermocyling cause a significant increase in the marginal gaps for all subgroups. RegardingΔE,no significant results were found between the subgroups also and all subgroups showed ΔE values within the clinically accepted range. Before thermocycling, all subgroups showed a non-significant difference regarding their SBS. However after thermocyling total etch adhesive group showed more statistically significant decrease in the SBS values when compared to the self-etch group. The type of composite used had no effect on the SBS.
Eighty freshly extracted premolar teeth for orthodontic reasons were collected and divided into two groups (n=40) according to the type of composite used (Incremental nano-hybrid and Bulk fill). Each group was later subdivided into two subgroups (n=20) according to the type of adhesive used (Total etch and Self-etch adhesive).
Four teeth from each subgroup underwent slot class II cavities in both mesial and distal surfaces of each premolar. Teeth were restored with the corresponding type of composite and adhesive for each subgroup according to manufacturer’s instructions.
Color parameters of each restoration were obtained using a Vita Easyshade spectrophotometer and marginal gap was assessed after the teeth were imaged using a digital microscope. Teeth were later subjected to 7500 thermal cycles between 5°C and 55°C and measured again for color and marginal gap. Color stability for each restoration was obtained by calculating theΔE values from the color parameters obtained.
Sixteen teeth from each subgroup were embedded into a resin block, and an isomet saw was used to cut the teeth to produce a flat dentin surface. All teeth were polished using 600-grit SiC paper to produce a standardized smear layer. Adhesive was applied to exposed dentin according to the manufacturer’s instructions and light cured. Composite was bonded to dentin using polyethylene transparent tubes having an internal diameter of 3mm and height of 4mm. Bulk-fill composite was placed in a single 4mm increment while microhybrid composite was inserted in two 2mm increments. SBS was tested using a universal testing machine by applying load at a crosshead speed of 0.5mm/min using a chisel. Half of the samples in each subgroup were tested after 24 hours of water storage, while the other half was tested after being subjected to 7500 thermal cycles between 5°C and 55°C. Data was analyzed using multivariate analysis of variance and tukey’s post-hoc test.
No significant results were found between subgroups regarding marginal gap. However, thermocyling cause a significant increase in the marginal gaps for all subgroups. RegardingΔE,no significant results were found between the subgroups also and all subgroups showed ΔE values within the clinically accepted range. Before thermocycling, all subgroups showed a non-significant difference regarding their SBS. However after thermocyling total etch adhesive group showed more statistically significant decrease in the SBS values when compared to the self-etch group. The type of composite used had no effect on the SBS.
Other data
| Title | A Comparative Study between Bulk Fill and Incrementally Packed Composite Using Different Adhesive Systems | Other Titles | دراسة مقارنة بين الملئ الكلي و الملئ الطبقي للحشوات الراتنجية باستخدام نوعين من لواصق الاسنان | Authors | Nada Atef Ahmed Aboushady | Issue Date | 2016 |
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