Preventive examination of a 7-year old child revealed a carious cavity with overhanging enamel within the limited area of a fissure in tooth 36. The probe catches in the softened dentin. In the other areas, the enamel on the edges of the fissures is glossy and dense. A dentist plans to fill the carious lesion of tooth 36. What tactics should be chosen regarding the intact areas of the fissure?