<prompt> Which of the following is not included in Class I cavity preparation?On occlusal surfaces of premolars and molarsOn occlusal two thirds of the facial and lingual surfaces of molarsOn the lingual surfaces of maxillary incisorsOn occlusal cusp tips of posterior teeth  <response>: All preparations required to treat pit-and-fissure caries are termed Class I preparations.These include preparations onOcclusal surfaces of premolars and molars.Occlusal two thirds of the facial and lingual surfaces of molars, andThe lingual surfaces of maxillary incisors.Preparations required to correct caries lesions that develop in the proximal surfaces of posterior teeth are termed Class II preparations.Preparations required to correct caries lesions or other defects that develop in the gingival third of the facial or lingual surfaces of all teeth are termed Class V preparations.Preparations required to correct caries lesions or other defects that develop in the incisal edges of anterior teeth or the occlusal cusp tips of posterior teeth are termed Class VI preparations.Reference: Sturdevant operative dentistry 7th EDITION page no.269 