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Introduction: The aim of this study was to investigate the influence of flowable composite intermediary liner on the microleakage between the tooth tissue and the packable composite resin. Materials and Methods: Forty mandibular molars, each prepared with two class II cavities were randomly divided in two groups: In group A one side was restored with Solitaire (KULZER); the other side was lined with Charisma flow (KULZER) and then restored with Solitaire. In group B one side was restored with Filtek p60 (3M); the other side was lined with Filtek flow (3M) and then restored with Filtek p60. Teeth were then thermocycled for 1000 cycle at 5o and 55o and immersed in a solution of 0.5% basic fuschin dye for 24 hours. Embedded specimens were sectioned longitudinally. Cervical and occlusal microleakage was measured by the extent of dye penetration. Results: Statistically in both groups, microleakge was more in the cavities that were not lined with flowable composites and the cervical margins showed more amount of microleakage as compared to occlusal margins with and without liner. Overall there was no significant difference in the amount of leakage among the two companies at cervical and occlusal margins, with and without flowable liner. Conclusion: Microleakge was more in the cavities that were not lined with flowable composites as compared to cavities lined with flowable composite both in occlusal and cervical margins. The cervical margins showed more amount of microleakage as compared to occlusal margins with and without liner. Keyword: Microleakge, Flowable composite, Packable composite.

The Nasopalatine Duct Cyst (NPDC) also commonly referred to as the anterior midline palatine cyst is a developmental cyst derived from the proliferation of embryonic epithelial remnants of nasopalatine duct. It is unique for the reason that it develops in only one location, which is the midline of anterior maxilla in close relationship to the nasopalatine canal. Radiographically, it presents as a well-demarcated ovoid or heart shaped cystic structure which is seen in close proximity to the apex of maxillary central incisors. Due to its anatomical location, it can be sometimes misdiagnosed as central giant cell granuloma, periapical cyst or follicular cyst. Chronic, large periapical lesions following traumatic injuries are challenging to diagnose and treat. The present case report described the successful management of a rare case of bilateral NPDC in a 30-year-old male patient, who gave a presentation closely mimicking that of an infected periapical cyst. The case was treated by both conventional endodontic therapy and surgical intervention. The NPDC tends to show a predilection in giving rise to squamous cell carcinomas which commonly occur in the anterior part of the maxilla. Therefore, cystic lesions seen in the premaxillary region require a thorough analysis so as to successfully treat the lesion and to avoid further complications that may arise due to a missed diagnosis.