human 4 saliva substitute Humans 3 dental procedure 3 Article 2 Fluorides 2 Microscopy, Electron, Scanning 2 Saliva, Artificial 2 Tooth Remineralization 2 comparative study 2 controlled study 2 enamel 2 fluoride 2 hardness 2 in vitro study 2 premolar tooth 2 procedures 2 scanning electron microscopy 2 surface property 2 tooth disease 2 Air Abrasion, Dental 1 Bicuspid 1 Bioglass 1 Ceramics 1 Dental Caries 1 Dental Enamel 1 Dental Prosthesis, Implant-Supported 1 Dental Stress Analysis 1 Dental implantation 1 Dentifrices 1