After preparing a site in the mouth of a patient to receive a dental prosthesis, the dental surgeon projects optically {HEAD ~ a grating} upon said site in the mouth of the patient and generates an interference pattern representing a holistic impression of said site and {TAIL ~ its relationship} to adjacent structures 
After preparing a site in the mouth of a patient to receive a dental prosthesis , the dental surgeon projects optically { HEAD ~ a grating } upon said site in the mouth of the patient and generates an interference pattern representing a holistic impression of said site and { TAIL ~ its relationship } to adjacent structures
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