Effect of an Additional Hydrophobic Adhesive Layer Application on the Class V Composite Restorations

In restorative dentistry, to enhance bond strength between dentin and simplified adhesive systems, new materials or applications are constantly being developed all the time. In order to create a better hybrid layer quality, modifications are made to the chemical contents and application methods of the adhesives. For inhibition or slow down of collagen or resin matrix degradation at the adhesive interface, procedures like using protease enzyme inhibitors or additional hydrophobic layer applications are tested by in vitro and in vivo studies.The main goal of this double-blind randomized clinical trial is to evaluate the 18-month clinical performances of two different one-step dentin adhesives that were applied alone or with an additional hydrophobic adhesive layer to non-carious cervical lesions.The hypotheses are that (1) Additional Hydrophobic Adhesive layer application can provide better clinical performance in class V restorations and, (2) the HEMA content will cause statistically different clinical performances.

Inclusion Criteria:18 and over 18 years oldHaving acceptable oral hygieneGood general healthHaving at least 20 teeth in occlusionPresence of at least 4 non-carious cervical lesions in the mouth that require treatmentLesions without cariesPatient's consent to come to control appointmentsVital and non-mobility of the tooth with the lesionDuring occlusion, the tooth with the lesion is in contact with the antagonist tooth.Exclusion Criteria:Under 18 years oldHaving poor oral hygienePoor general health conditionPregnancy or breastfeeding statusOrthodontic application in the last 3 monthsThe tooth with the lesion has pulpitis, mobility or it is non-vitalPresence of advanced bruxismThe tooth with the lesion is a prosthetic abutmentPresence of advanced periodontitis or periodontal surgery in the last 3 months