Biomaterial Database

Pinhole preparation for self-threading pins. 1991

A G Podshadley, and R Storey

Department of Reconstructive Dentistry, University of Louisville, School of Dentistry, Ky.

The force required to remove self-threading retention pins from dentin when the holes were drilled with two different methods was determined. The two methods employed to drill the holes were (1) using a conventional slow-speed contra-angle handpiece and (2) using a 10-to-1 gear reduction contra-angle handpiece attached to a conventional slow-speed handpiece. Also determined were the number of drills broken in the process of drilling the holes. Results demonstrated no difference in the retention of pins placed in holes drilled using these two methods. Two drills were broken in the process of drilling well over 100 holes, and both breaks occurred with the gear-reduced handpiece. Either of the two methods tested is acceptable, but we recommended using a conventional slow-speed contra-angle handpiece because of the ease of producing the holes.

UI	MeSH Term	Description	Entries
D003737	Dental Cavity Preparation	An operation in which carious material is removed from teeth and biomechanically correct forms are established in the teeth to receive and retain restorations. A constant requirement is provision for prevention of failure of the restoration through recurrence of decay or inadequate resistance to applied stresses. (Boucher's Clinical Dental Terminology, 4th ed, p239-40)	Cavity Preparation, Dental,Cavity Preparations, Dental,Dental Cavity Preparations,Preparation, Dental Cavity,Preparations, Dental Cavity
D003772	Dental Pins	Small cylindrical pieces of metal used to enhance retention.	Dental Pegs,Dental Peg,Dental Pin,Peg, Dental,Pegs, Dental,Pin, Dental,Pins, Dental
D003793	Dental Restoration, Permanent	A restoration designed to remain in service for not less than 20 to 30 years, usually made of gold casting, cohesive gold, or amalgam. (Jablonski, Dictionary of Dentistry, 1992)	Dental Fillings, Permanent,Dental Filling, Permanent,Dental Permanent Filling,Dental Permanent Fillings,Dental Restorations, Permanent,Filling, Dental Permanent,Filling, Permanent Dental,Fillings, Dental Permanent,Fillings, Permanent Dental,Permanent Dental Filling,Permanent Dental Fillings,Permanent Dental Restoration,Permanent Dental Restorations,Permanent Filling, Dental,Permanent Fillings, Dental,Restoration, Permanent Dental,Restorations, Permanent Dental
D003804	Dentin	The hard portion of the tooth surrounding the pulp, covered by enamel on the crown and cementum on the root, which is harder and denser than bone but softer than enamel, and is thus readily abraded when left unprotected. (From Jablonski, Dictionary of Dentistry, 1992)	Dentine,Dentines,Dentins
D004867	Equipment Design	Methods and patterns of fabricating machines and related hardware.	Design, Equipment,Device Design,Medical Device Design,Design, Medical Device,Designs, Medical Device,Device Design, Medical,Device Designs, Medical,Medical Device Designs,Design, Device,Designs, Device,Designs, Equipment,Device Designs,Equipment Designs
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D013314	Stress, Mechanical	A purely physical condition which exists within any material because of strain or deformation by external forces or by non-uniform thermal expansion; expressed quantitatively in units of force per unit area.	Mechanical Stress,Mechanical Stresses,Stresses, Mechanical