More than 1 sample in each individual
Number of samples in each individual:
2
For each patient, two permanent first mandibular molars will be considered. The 80 studied teeth will be divided into two groups of 40. All teeth were treated by the same operator. First, the surface of the teeth is cleaned of debris and plaque with a rotating brush, and after washing and drying the tooth surfaces and examining the occlusion with articulating paper, each tooth is isolated by a cotton roll inside the buccal and lingual vestibule. Then, the tooth surfaces of both groups are prepared for placement of two types of materials for pit and fissure sealant, so that in each patient, the first permanent lower molar tooth on the bottom right is sealed with self-adhesive flowable composite resin with (Vertise Flow with A2 color from Kerr company, USA) and the first permanent lower molar tooth on the left side is sealed with the light cure pit and fissure-sealant resin with A2 color (Master-Dent company from USA)