Although pins have been used since the 1800's for retention of dental restorations, their widespread use had been limited because supporting techniques such as impression, die materials, better handpieces and drills have only been perfected in the last two decades.
The pin technique allows for greater retention of restorative materials which otherwise might require considerable reduction of sound tooth substance; this is particularly paramount when insufficient coronal tooth structure is present. Also, the placing of pins in divergent directions gives excellent retention. Pin-retained castings reduce the need for deep cavity preparation in some cases.
Pins are useful in stabilizing hypermobile teeth, in that they allow for tooth anchorage otherwise difficult to achieve unless crowns are fabricated and splinted. In cases of placing a post in an endodontically treated tooth, pins may be used to support the post. Malpositioned teeth which in no way would "draw in conventional bridge fabrication methods, can be used for abutments by using a variety of pin retention techniques.
Factors which influence any technique are number of pins, length, diameter, surface characteristics, direction, dimensional tolerance, and cementing material; typically, two to four pins are placed in 2-3 mm deep channels.
Robert A. James
William S. Seibly
Douglass B. E. Roberts
William R. Rothgeb
Master of Science (MS)
Year Degree Awarded
Date (Title Page)
Library of Congress/MESH Subject Headings
Dental Pins; Dentistry, Operative
Loma Linda University Libraries
This title appears here courtesy of the author, who has granted Loma Linda University a limited, non-exclusive right to make this publication available to the public. The author retains all other copyrights.
Asad, Ali M., "The Uses of Pins for Retention in Restorative Dentistry : An Independent Learning Program" (1975). Loma Linda University Electronic Theses, Dissertations & Projects. 1310.
Loma Linda University Electronic Theses and Dissertations
Loma Linda University. Del E. Webb Memorial Library. University Archives