Mandibular first molar. The<unk>  is a term for the portion of the central groove on a permanent mandibular first molar which lies between the two central pits. It was named for long time dental anatomy instructor Dr. Christopher S.<unk> , a Mercer Island, WA dentist.
Lewis offset
Bragg peak
Skew deviation
Gain-field encoding
Midline shift
Delta wave
Flattening the curve
Extraction ratio