Original Research Article http://doi.org/10.18231/j.jds.2019.001 J Dent Specialities. 2019;7(1):3-5 3 Clinical evaluation of Cention–N and nano hybrid composite resin as a restoration of non- carious cervical lesion Parth V Dodiya 1* , Vaishali Parekh 2 , Mona Somani Gupta 3 , Nidhi Patel 4 , Mukti Shah 5 , Surabhi Tatu 6 1,4,5,6 Post Graduate Student, 2 HOD, 3 Senior Lecturer, Dept. of Conservative Dentistry and Endodontics, Karnavati School of Dentistry, Uvarsad, Gandhinagar, Gujarat, India *Corresponding Author: Parth V Dodiya Email: parthdodiya3@gmail.com Abstract Introduction: Non carious cervical lesion, (NCCL) is the loss of tooth structure at the cemento enamel junction, or CEJ level that is unrelated to dental caries. These lesions can affect plaque retention, tooth sensitivity, structural integrity, caries incidence, and pulpal vitality. Objectives: To compare clinical effectiveness of Cention–N and Nanohybrid composite resin as a restoration of non-carious cervical lesion for gross fracture, marginal integrity & surface texture. Materials and Methods: Total 24 patients having two class V non-carious cervical lesion in the same arch, approximately of same size and shape were selected. Entire study was carried out by two operators. Both teeth were restored, finished and polished by one operator with Cention–N and Tetric N Ceram (Ivoclar – Vivadent) respectively. Evaluation for marginal integrity & surface texture was done by second operator on the same day of restoration. (USPHS, Ryge criteria for direct clinical evaluation). Follow up was done for gross fracture, marginal integrity & surface texture after 1 week, 1 month, 3 month & 6 month. All the data were collected according to USPHS, Ryge Criteria. Statistical analysis was done by chi square test. Results: Cention–N is as effective as Tetric-N-Ceram for gross fracture and marginal integrity till 6 months. But Cention–N showed inferior surface characteristics than Tetric-N-Ceram after 1 week. Conclusion: Cention – N is as effective as Tetric N Ceram for gross fracture and marginal integrity but Cention – N has an inferior surface characteristics than Tetric N Ceram. Keywords: Cention-N, Non-carious cervical lesion, Nano hybrid composite. Introduction Non carious cervical lesion, (NCCL) is the loss of tooth structure at the cemento enamel junction, or CEJ level that is unrelated to dental caries. These lesions can affect plaque retention, tooth sensitivity, structural integrity, caries incidence, and pulpal vitality. 1 Other problems which are commonly associated are cosmetic problems, unpleasant hypersensitivity, painful sensations, pathological changes in the pulp, and eventually tooth loss. 2-4 There are various factors which are responsible for occurrence of non carious cervical lesions. Various factors like stress, friction, bio corrosion are responsible for occurrence of NCCL. Endogenous factors like parafunction, occlusion, deglutition, plaque (caries), gingival crevicular fluid, gastric HCl & exogenous factors like diet, mastication, habits, occupations, dental appliances, dental hygiene are also responsible. Electrochemical effects like piezoelectric effect on dentin also affect the teeth. So we can say that non carious cervical lesions are multifactorial in origin and single factor is responsible for occurrence of that. 2 It has not been clearly identified as to whether any one process is more responsible for lesion initiation or for progression, or vice versa. 1 The lesion can be either in the shape of wedge, saucer or a combination of both. Various restorative materials are used for this like resin-based composite (RBC), glass- ionomer or resin-modified glass-ionomer (GI/RMGI) and temporary restorative materials. 3 Further more special characteristics of these lesions include the presence of dentin or cementum in the gingival margins and restorations that are more susceptible to micro leakage and postoperative sensitivity. Mechanical retention is not enough and difficulty to control moisture contamination in doing these restorations. 5 The role of mechanical stress is widely accepted as a cause of failure of restorations 6 and because of this occlusal loading at the cervical margin leads to cuspal flexure. 7 Hence, a critical factor for the restorative success of cervical lesions is the selection of the restorative materials. These all materials have their advantages and dis- advantages. Therefore, the aim of the current study is to compare the nano hybrid composite and newly arrived alkasite based CENTION-N for the restoration of non- carious cervical lesions. Materials and Methods Total 48 maxillary permanent premolar teeth of 24 patients were selected. Written concent was obtained from all patients. For the purpose of standardisation the occluso gingival height up to 4 mm, depth up to 1-2 mm of the lesions was maintained in all patients. Dimensions were measured with the help of a periodontal probe. For standardisation, teeth free of any restoration, caries & in occlusion were included in the study. Patient having periodontal disease, xerostomia, teeth without antagonist, crack, previous restoration and caries were excluded. Isolation of all teeth was carried out by gingival retraction cord. After isolation, 37% phosphoric acid gel was used for etching for 20 seconds and then it was rinsed with distilled water with the help of three way syringe. Tooth surface was