Linked Life Data

9658803

Source:http://linkedlifedata.com/resource/pubmed/id/9658803

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
1998-9-8
pubmed:abstractText
The standard drill size for most osteosynthesis screws is about 75% of the screw's external diameter. When screws are inserted in thick cortical bone, a small pilot hole size can result in high torsional stress, leading to screw fracturing. The aim of this study was to enlarge the drill size up to a critical pilot hole size, exceeding of which leads to a rapid decrease of the screw's holding power. Titanium screws of diameter 1.5 and 2 mm were inserted in discs of PVC, wood and porcine mandibular bone with different thickness between 2 to 4 mm, using pilot hole sizes of 66-95% of the screw's external diameter. The maximum torque was recorded and pull-out tests were performed. Ten trials were conducted for each screw-pilot hole size-material combination, yielding a total of 1560 tests. A multiphase regression analysis was performed to calculate the critical pilot hole size (CPHS). In torque measurements, the CPHS of microscrews were between 83% and 85% of screw outer diameter (SOD) and the CPHS of miniscrews were between 80% and 90% of SOD. In pull-out analysis the CPHS of microscrews were between 83% and 89% of SOD and the CPHS of miniscrews were between 79% and 91% of SOD. The CPHS was thus found to be around 85% of the screw's external diameter. Up to this critical point the pilot hole size may be increased without affecting the holding power of the screws.
pubmed:language
ger
pubmed:journal
pubmed:citationSubset
D
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
1432-9417
pubmed:author
pubmed:issnType
Print
pubmed:volume
2
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
136-40
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1998
pubmed:articleTitle
[Effect of the diameter of various bore holes on retention of osteosynthesis screws].
pubmed:affiliation
Klinik für Mund-, Kiefer- und Gesichtschirurgie, Otto-von-Guericke Universität, Magdeburg.
pubmed:publicationType
Journal Article, Comparative Study, In Vitro, English Abstract