This study involves Invivo and Invitro comparative evaluation of One Shade Universal Composite Resin and Universal Nanohybrid Composite Resin. 80 patients of age group 18 years - 35 years having non carious cervical lesions in atleast two maxillary premolars will be selected for the study after obtaining their informed consent in writing. After preparation of standardised class V cavities at the cervical lesions the two composite resins will be used to restore the same using standardised protocol and as per manufacturers instructions. Clinical evaluation One Shade Universal Composite Resin and Universal Nanohybrid Composite Resin will be done using Digital VITA Shade Guide and using the USPHS Criteria to evaluate marginal discolouration, marginal integrity, surface texture, wear, post operative sensitivity and recurrent caries. The findings will be recorded at baseline, 6 months, 12 months, 18 months and 24 months. There will be blinding of the evaluators who will be evaluating the restorations at the said intervals.

  The Invitro part of the study involves preparation of 80 discs each of One Shade Universal Composite Resin and Universal Nanohybrid Composite Resin having 8 mm diameter and 2 mm depth. All the discs will be subjected to artificial ageing by following the thermocycling protocol for 2 years. Evaluation for shade, surface roughness and microhardness will be done at baseline, 12 months and 24 months. The values will be recorded and saved for statistical analysis.

This study is unique as there will be long term clinical evaluation between One Shade Universal Composite Resin and Universal Nanohybrid Composite Resin and also invitro laboratory comparative evaluation of the disc specimens of the said materials will be carried out.