Comparative Evaluation of Shear Bond Strength of Nanohybrid Composite Restoration After the Placement of Flowable Compomer and Composite Using the Snowplow Technique.

AIM: Based on the importance of bonding during restoration, this in vitro study aimed to evaluate the difference in shear bond strength of nanohybrid composite restoration in molars after the placement of flowable compomer and composite using the snowplow technique. MATERIALS AND METHODS: Twenty-four freshly extracted molars were taken and sectioned at the level of 2.5 mm from the coronal cusp and root tip. These sections were embedded in methacrylate and, after etching and bonding, were randomly divided into two groups (n=12) for placement of restorative materials. In group A, the plastic tube was filled with uncured flowable composite resin followed by the placement of packable nanohybrid composite in oblique increments. In group B, the plastic tube was filled with uncured flowable compomer followed by the placement of packable nanohybrid composite in oblique increments. Each specimen was then tested under a universal testing machine to determine the shear bond strength. RESULTS: Independent sample 't' test revealed a statistically significant difference between the mean shear bond strength of compomer and composite (P value<0.001), where flowable composite showed higher values compared to compomer.  Conclusion: It was seen that the use of composite showed a significantly better bond strength of the restoration when compared to compomer using the snowplow technique. Both materials and application techniques can influence the bond strength of a material as determined in this study.

Premixed bioceramics: A novel pulp capping agent.

The main aim of restorative dentistry is to protect the vitality of the Pulp tissue. The pin point carious expoure and iatrogenic errors warrant the need for various pulp capping procedures like Indirect Pulp Capping and Direct Pulp Capping. Pulp Capping is dressing of the dental pulp exposed due to mechanical procedure, carious lesion or traumatic injury to preserve its vitality and function. There has been constant evolution and research on materials used to cap the Pulp tissue. The different kind of chemical and biological materials has been used with varying degree of success. The prognosis based on the pulp capping material has dramatically improved with the introduction of bioactive cement. Though MTA and biodentine have shown a high success rate, their properties can be adversely affected with error in powder/liquid ratio and may present with difficulty in the handling characteristic. Premixed bioceramics have been introduced in the market and present with desirable properties as a pulp capping agent. Owing to good handling characteristics, biocompatibility, odontogenic property, and antibacterial action it is a potent pulp capping agent for clinical application. This review is aimed to discuss the introduction of premixed bioceramics, forms of premixed bioceramics available, and its physical, chemical, and biocompatible properties.