Evaluation of the Effect of Occluso-gingival Distance and different shapes of Non-Carious Cervical Lesions on the Clinical Performance of Recent Types of Restorative Materials. (An In Vivo Study).

Objective: This trial was done for evaluation of the evaluate the effect of occluso-gingival distance and different shapes of non-carious cervical lesions on the clinical performance of recent types of restorative materials. Materials and methods: Eighty-seven participants with 126 non-carious cervical lesions (NCCLs) in first maxillary premolar were divided into two main groups according to Occluso-gingival distance (OGD), each main group was equally subdivided into three subgroups according to the shape of NCCLs, after that, each subgroup was further subdivided into three subgroups according to restorative materials, Filtek Z350 XT, Filtek Bulk Fill Posterior and ketac nano 100. Two calibrated examiners conducted clinical evaluations using the modified US Public Health Service (USPHS) criteria to assess retention, marginal staining, marginal adaptation, recurrence of caries, and postoperative sensitivity at 7 days, 6 months, and 1 year. Results: clinical evaluation of restored NCCLs after all follow-up periods at OGD of 1.5-mm and 3-mm showed a non-statistically significant difference. Where ketac nano 100 showed best retention rate followed by Filtek Bulk Fill Posterior and Filtek Z350 XT . While the results showed a statistically significant difference at 6-months, and 1-year follow-up periods respectively for marginal staining with best rate recorded for Filtek Bulk Fill Posterior and Filtek Z350 XT and the lowest rate was recorded for ketac nano 100. however, no statistically significant difference at baseline. Conclusions: All tested materials used in this clinical study presented an acceptable result at the 12 months evaluation.