Analysis of the osseous/metal interface of drill free screws and self-tapping screws

Heidemann, W.; Terheyden, Hendrik; Gerlach, Klaus

doi:10.1054/jcms.2000.0179

Cited by 69 publications

(57 citation statements)

References 20 publications

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“…Second, because the miniscrews were subjected to tension or torsion over 12 weeks by the NiTi coil spring, surface changes might occur in the miniscrews. 21,22 Third, the deposits around the miniscrews or the materials precipitated on its surface from contact of the miniscrew with biological fluids were likely due to clogs in open pores.…”

Section: Discussionmentioning

confidence: 99%

Surface changes of anodic oxidized orthodontic titanium miniscrew

Choi

Yul

Joo³

et al. 2012

The Angle Orthodontist

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Objective: To evaluate the structural stability of anodic oxidation treatment of miniscrews during a self-drilling procedure and an initial loading period. Materials and Methods: Eight orthodontic miniscrews with a machined surface and an anodic oxidized surface were placed in the mandible of two beagle dogs. With all miniscrews, an orthodontic force was applied immediately after placement and was continued for 12 weeks. After beagle dogs were sacrificed, the miniscrews were carefully removed from decalcified bone fragments. Miniscrews were evaluated by comparing and quantitatively analyzing changes in surface roughness of unused and used miniscrews (machined surface vs anodic oxidized surface) utilizing both scanning electron microscopy (SEM) and atomic force microscopy (AFM). Results: SEM revealed that only a thread edge close to the tip of the used anodic oxidized miniscrew became smooth by smearing, compared with the unused anodic oxidized miniscrew. No definite changes were observed in the thread valleys of the two groups after placement. AFM measurements demonstrated that all surface roughness parameters of thread edges of the used anodic oxidized miniscrews were significantly reduced compared with the unused anodic oxidized miniscrew (P , .05). A middle thread edge of the used anodic miniscrew surface was rougher than the unused and used machined surface miniscrews (P , .05). Conclusion: Anodic oxidized miniscrews had improved surface characteristics compared with machined surface miniscrews, even if the surface texture was changed by the self-drilling procedure and during the initial loading period. (Angle Orthod. 2012;82:522-528.)

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Section: Discussionmentioning

confidence: 99%

Surface changes of anodic oxidized orthodontic titanium miniscrew

Choi

Yul

Joo³

et al. 2012

The Angle Orthodontist

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“…7,8 Secondary stability is achieved through continuous bone remodeling around the mini-implant, leading to osseointegration. 9,10 To achieve optimal stability, previous studies have examined various mini-implant parameters, such as loading protocol, surface treatment, shape, diameter, length, tapering, and thread count. 7,9,[11][12][13] concluded that stability can be enhanced by maximizing the interlocking surface area (SA) between the bone and implant, which can be achieved by increasing diameter, adding threading, and tapering mini-implants.…”

Section: Introductionmentioning

confidence: 99%

“…9,10 To achieve optimal stability, previous studies have examined various mini-implant parameters, such as loading protocol, surface treatment, shape, diameter, length, tapering, and thread count. 7,9,[11][12][13] concluded that stability can be enhanced by maximizing the interlocking surface area (SA) between the bone and implant, which can be achieved by increasing diameter, adding threading, and tapering mini-implants. 4,11,13 However, these design modifications may cause patient discomfort and bony microfractures during placement.…”

Section: Introductionmentioning

confidence: 99%

Stability comparison between commercially available mini-implants and a novel design: Part 1

Hong¹,

Lee²,

Webster³

et al. 2011

The Angle Orthodontist

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Objective: To compare mechanical stability among five mini-implant designs-a newly invented design and four commercially available designs that vary by shape and threading; to calculate external surface area of each design using high-resolution micro-computed tomography; and to evaluate the relationship between surface area and stability results. Materials and Methods: The four commercially available mini-implants-single-threaded and cylindrical (SC), single-threaded and tapered (ST), double-threaded and cylindrical (DC), doublethreaded and tapered (DT)-and a new implant that is designed to engage mostly in cortical bone with shorter and wider dimensions (N1) were inserted in simulated bone with cortical and trabecular bone layers. The mechanical study consisted of torque measurements and lateral displacement tests. External surface area was computed using a 25-mm micro-CT. Results: Maximum insertion torque, maximum removal torque, and force levels for displacements were the highest in N1, followed by DT, ST, DC, and SC (a 5 .05). The surface area was largest in DT, followed by N1, ST, DC, and SC. Surface area engaged in cortical bone, however, was the greatest in N1. The surface area of mini-implants had positive correlation with stability. Conclusion: Among commercial designs, both added tapering and double threading improved stability. N1 was the most stable design within this research design. The new design has the potential to be clinically superior; it has enhanced stability and there is diminished risk of endangering nearby anatomic structures during placement and orthodontic treatment, but the design requires refinements to reduce insertion torque to avoid clinical difficulty and patient discomfort. (Angle

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“…The implants with cuts or self-taper have advantages over implants that do not have cuts in their apex region, since a smaller number of milling cutters is required for their installation, reducing thermal damage to bone tissue, making surgery easier and faster. 21 In addition, with less preparation during drilling, the amount of bone tissue viable in contact with the implant increases, favoring the osseointegration. 22 Regarding the insertion torque, we found that the Qs (16.19 N.cm) and (control) (18. There is a consensus in the literature that the greater the bone density at the surgical site, the greater the primary stability of the implant.…”

Section: Discussionmentioning

confidence: 99%