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Volume 31 , Issue 2
March/April 2011

Pages 141-147


Screw Spreading: Technical Considerations and Case Report

Renato Sussumu Nishioka, DDS, PhD, MSc/Alberto Noriyuki Kojima, DDS, PhD, MSc


PMID: 21491013
DOI: 10.11607/prd.00.0970

The spreading system is an alternative technique to the Summers osteotome. The crest expansion technique is a less invasive procedure in which the facial wall expands after the medullary bone is compressed against the cortical wall. It improves the density of the maxillary bone, which allows for greater initial stability of implants. A specific screw instrument, the “spreader,” achieved a controlled and standardized dilation of the bone horizontally. The use of spreaders to enhance the dental implant site is a highly predictable procedure. (Int J Periodontics Restorative Dent 2011;31:141–147.)


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