Comparison of Microleakage of Composite Restorations using Fifth and Sixth Generation Dentin Bonding Agent: An in vivo Study

Abstract

Introduction The success of bonded restorations depends on effective bonding between restorative materials and tooth structure, and it prevents microleakage. New dentin bonding systems have been introduced which promotes this concept. The aim of this study was to compare the amount of microleakage between ‘single bond’ vs ‘Prompt L-Pop’ during different time periods. Materials and methods In this clinical trial study, 60 nonretentive class five cavities were prepared on buccal surfaces of human premolars which were scheduled to be removed for orthodontic purposes. The cavities were restored using two different bonding agents; fifth generation (Single Bond) and sixth generation (Prompt L-Pop) and then filled with resin composite (Filtek Z-250). The samples in both groups were extracted after placing the restoration in three periods of time: Immediately, 1 week and 6 months postplacement. Specimens were sealed with two layers of nail varnish except for 1 mm around restoration and immersed in a silver nitrate solution for 24 hours. The teeth were then sectioned longitudinally and the degree of microleakage was determined by stereomicroscope based on standard usual criteria. Results Single bond showed more leakage at dentin margin than enamel margin in all three extraction periods and differences were significant among three groups (p < 0.05). In samples which were restored with Prompt L-Pop only in groups of 6 months there were significant differences between enamel and dentin margins. At enamel margin there were no significant differences between microleakage of groups according to the passage of time (p > 0.05). Conclusion The results of this study using two different bonding systems, indicate that adhesion to enamel was more valuable than dentin and perhaps systems that include self-etching primers are less sensitive to remaining moisture on dentin and they are less affected during different time periods. How to cite this article Samimi P, Barekatain M, Alaei S. Comparison of Microleakage of Composite Restorations using Fifth and Sixth Generation Dentin Bonding Agent: An in vivo Study. J Contemp Dent Pract 2012;13(5):632-636.

Polymerization stress – Is it clinically meaningful?

“…These studies provided a physically observable outcome for the stress that had been proven to exist in dental composites, and made the concept of stress generation more "clinically relevant" to the practitioner and researcher alike. In most studies involving the placement of composite in preparations with margins in both enamel and dentin, sealing is typically better to acid-etched enamel [58,59], suggesting that the presence of a higher bond strength at this margin produces a more perfect seal. It is also true that when stress builds up within the curing material, it will tend to be relieved at the more vulnerable dentin interface and remain sealed with the enamel interface.…”

Comparative Evaluation of Microleakage With Total-Etch, Universal (Self-Etch Mode), and Nano Adhesive Systems in Class V Composite Restorations: An In-Vitro Study

“…One of the best predictors of the long-term success of bonded restorations is the ability of marginal sealing [4]. The passage of oral fluids, bacteria, molecules, and ions between cavity walls and restorative material is termed microleakage [4].…”

“…One of the best predictors of the long-term success of bonded restorations is the ability of marginal sealing [4]. The passage of oral fluids, bacteria, molecules, and ions between cavity walls and restorative material is termed microleakage [4]. Microleakage has also been linked to many postoperative failures, such as sensitivity, recurrent caries, pulpal damage, and fracture of the restorative material.…”

“…Though several studies have been conducted to evaluate the microleakage of the bonding agents of different generations [3,4], very few studies have been conducted to evaluate the microleakage of total-etch, universal, and nano adhesive systems. This present study was, thus, carried out to investigate and compare the microleakage of composite resin with total-etch, universal, and nano adhesive systems in Class V restorations using a stereomicroscope.…”