<prompt> Extraction of mandibular first molar in an 8 year old child is known as:Wilkinsons extractionCompensatory extractionSerial extractionOrthodontic extraction  <response>: Wilkinson Extraction Wilkinson advocated extraction of all the four first permanent molars between the age of 8 12 9 years. The basis of it is the fact that first molars are highly susceptible to caries. The other benefits of extracting first molars at an early age are:To avoid third molar impactions by providing additional space for their eruption. To reduce crowding in the arch. 