evaluation of post-operative sensitivity of bulk fill resin composite versus the nano resin composite.

Conditions: Sensitivity

Summary: our study evaluated and compared the postoperative sensitivity of the placement technique (incremental and bulk fill) in class ii posterior composite resin restorations bonded with two different adhesive strategies (self-etch and etch-and-rinse).sixty patients were randomly selected, their age range from 25 to 40 years old. they were divided into 2 main groups according to the packing technique of composite material; incremental tetric evoceram and tetric evoceram bulk fill composite.30 patients (n=30) were selected for incremental tetric evoceram composite restorations and they were equally divided according to the adhesive systems used (etch and rinse or self-etch adhesive strategy) (n=15 teeth).30 patients (n=30) were selected for tetric evoceram bulk fill composite restorations and they were equally divided according to the adhesive systems used (etch and rinse or self-etch adhesive strategy) (n=15 teeth).post-operative pain assessed at 24 hours, 1 week and 1 month using the visual analog scale score (vas).each patient was instructed to place a vertical mark on the vas line at home to indicate the intensity of pain at each assessment period.

our results revealed that when the two composite types using self-etch adhesive system \& total-etch adhesive system were evaluated; there was no statistically significant difference between the two composite types after 1 day, 1 week as well as 1 month. when the two adhesive systems were compared using bulk fill composite \& incremental nano resin composite there was no statistically significant difference between the two adhesive systems after 1 day, 1 week as well as 1 month. using bulk fill composite with self-etch adhesive; there was a statistically significant decrease in prevalence of hypersensitivity after 1 week. there were no cases with hypersensitivity after 1 week as well as 1 month. using bulk fill composite with total etch adhesive; there was a statistically significant decrease in prevalence of hypersensitivity after 1 week as well as from 1 week to 1 month. using incremental nano resin composite with self-etch adhesive; there was a statistically significant decrease in prevalence of hypersensitivity after 1 week as well as from 1 week to 1 month. using incremental nano resin composite with total etch adhesive; there was a statistically significant decrease in prevalence of hypersensitivity after 1 week as well as from 1 week to 1 month.

Eligibility criteria:
inclusion criteria: * patients must show no signs of spontaneous dental or orofacial pain. * the presence of molar and premolar class ii teeth requiring composite restorations for the treatment of primary carious lesions * the selected teeth should have an occlusal contact with natural or crowned antagonist teeth * the selected teeth should have a proximal contact with the adjacent teeth. * shallow and mid-sized cavity depths will be included in the study . exclusion criteria: * increasing pre-operative sensitivity of the selected teeth. * teeth with abnormal periapical anatomy or caries that will be likely to result in very deep restorations. * teeth with old restorations or severely destructed dental crowns. * teeth with spontaneous pain * tempro-mandibular joint problems involving symptomatic pain. * patients taking analgesics that could alter their normal pain perception level. * pregnancy or breast feeding, acute and chronic systemic diseases, immunecompromised patients.

Keywords: post operative sensitivity