Increased Insertion Torque Delays Pin–Bone Interface Loosening in External Fixation With Tapered Bone Screws

Lawes, Timothy J.; Scott, J.; Goodship, AE

doi:10.1097/00005131-200410000-00007

Cited by 16 publications

(10 citation statements)

References 34 publications

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“…Lawes et al 17 suggested that a high insertion torque of a tapered bone screw is associated with less loosening at the bone-implant interface. In contrast, Frost 18 stated that integrity could not be maintained if too much bone change occurred.…”

Section: Discussionmentioning

confidence: 99%

“…This is due to the increase of bone-implant contact by bone remodeling and bone maturation during the first 6 weeks. [16][17][18] Stability of orthodontic mini-implants was evaluated by measuring removal torque 13,22 and histomorphometric analysis was evaluated by measuring BIC. 23,24 Mechanical analysis showed no change in maximum removal torque or total energy with time lapse.…”

Section: Discussionmentioning

confidence: 99%

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Effects of predrilling on the osseointegration potential of mini-implants

Shin

Ahn

Park

et al. 2012

The Angle Orthodontist

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Objectives: To determine a reliable method of drilling a pilot hole when using a self-tapping surface-treated mini-implant and to evaluate stability after placement. Materials and Methods: Implant sites were predrilled in 12 rabbits with two devices: a conventional motor-driven handpiece and a newly developed hand drill. Mini-implants were then inserted in a complete random block design. Samples were divided into 1-week and 6-week groups to investigate osseointegration capacity in relation to the two time intervals. Mechanical and histomorphometric assessments were performed. Results: Mechanical analysis revealed no difference in maximum removal torque or total removal energy between the motor-driven predrilling group and the hand-drilling group. No difference was found between the 1-week group and the 6-week group. Histomorphometric evaluation showed no difference in the bone-implant contact (BIC) ratio or the bone volume (BV) area. For the time interval, a statistically significant increase in BIC and BV area was found in the 6-week group when compared to the 1-week group. Conclusions: The osseointegration potential of the motor-driven predrilling method was not different from that of the manual predrilling method with the newly developed hand drill. Hand drilling may be an attractive predrilling method in preference to the conventional motor-driven pilot drilling. (Angle Orthod. 2012;82:1008-1013

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Effects of predrilling on the osseointegration potential of mini-implants

Shin

Ahn

Park

et al. 2012

The Angle Orthodontist

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“…Lawes et al 27 suggested that a high insertion torque of a tapered bone screw decreases loosening at the interface with bone. In contrast, Frost 28 mentioned that integrity could not be maintained if too much bone change occurred.…”

Section: Discussionmentioning

confidence: 99%

Mechanical Characteristics of Various Orthodontic Mini-screws in Relation to Artificial Cortical Bone Thickness

Song

Yul

Hwang

2007

The Angle Orthodontist

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“…Diamond-like carbon (DLC) is a low-surface-energy 4 material that can be applied to a metallic substrate as a thin surface layer. DLC coatings are widely used as scratch-resistant coatings for civilian and military optics, 5 and as hard, wear-resistant coatings for machine tools 6 and surgical instruments. 7 An increase in surface roughness and surface energy has been shown to increase the rate of bacterial colonization and biofilm formation.…”

Section: Introductionmentioning

confidence: 99%

Modulation of the soft tissue reactions to percutaneous orthopaedic implants

et al. 2006

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To evaluate soft tissue reactions and biofilm formation on percutaneous external fixator screws coated with diamond-like carbon (DLC) and hydroxyapatite (HA) coatings on stainless-steel (SS) pins in an ovine loaded osteotomy model, an Orthofix external fixator was used to stabilize a 3-mm tibial midshaft osteotomy with six tapered pins inserted into the right tibia of 32 skeletally mature Friesland ewes. Animals were divided into four groups; SS, fully coated HA, DLC, and HA-coated threads. At 10 weeks, specimens were harvested and the pins were removed en bloc to examine the interfaces between the surface coatings and the tissues. Fully coated HA pins had a significantly higher percentage of dermal contact with the pin surface than HA-coated threads (p ¼ 0.028). The presence of a biofilm was evident on all pin surfaces except DLC-coated pins. Significantly greater numbers of bacteria were present on fully coated HA and plain stainless-steel pins compared with DLC. The surface of DLC-coated pins had a significantly lower number of bacterial colonies compared to SS (p ¼ 0.028) and fully coated HA pins (p ¼ 0.005). Fully coated HA pins have greater dermal attachment to the pin surface than the other pin coatings investigated. DLC-coated pins have the potential to prevent biofilm formation and bacterial colonization that may reduce infection and consequent pin loosening. An external fixator pin that is partially coated with HA to encourage bone and soft tissue integration and with DLC to reduce biofilm formation is advocated. ß

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Increased Insertion Torque Delays Pin–Bone Interface Loosening in External Fixation With Tapered Bone Screws

Abstract: The data from this study indicate that tapered external fixation pins should be inserted with a high torque to enhance the long-term integrity of the pin-bone interface.

Cited by 16 publications

References 34 publications

Effects of predrilling on the osseointegration potential of mini-implants

Effects of predrilling on the osseointegration potential of mini-implants

Mechanical Characteristics of Various Orthodontic Mini-screws in Relation to Artificial Cortical Bone Thickness

Modulation of the soft tissue reactions to percutaneous orthopaedic implants

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