The effect of repeated torque and salivary contamination on the preload of slotted gold implant prosthetic screws

Tzenakis, George K.; Nagy, William W.; Fournelle, R.A.; Dhuru, Virendra B.

doi:10.1067/mpr.2002.127604

Cited by 78 publications

(77 citation statements)

References 6 publications

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“…Flattening and wear of these high spots is described as screw settling, and will result in the loss of some of the initial preload. 18 Also, during occlusal function, the vibration and damping effect at the screw joint can result in a loss of screw preload and hence loosening.…”

Section: Discussionmentioning

confidence: 99%

Retrieval of a fractured abutment screw thread from an implant: a case report

Satterthwaite

Rickman

2008

Br Dent J

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Section: Discussionmentioning

confidence: 99%

Retrieval of a fractured abutment screw thread from an implant: a case report

Satterthwaite

Rickman

2008

Br Dent J

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“…10 Fixture joint system efficiency can be improved by taking the screw off and subsequently tightening it. 11,12 During abutment screw tightening, a compressive strength is generated to keep implant and abutment surfaces in contact. The success of this joint is directly related to attaining preload during its tightening and maintaining this preload over time.…”

Section: Introductionmentioning

confidence: 99%

Effects of different torque levels on the implant-abutment interface in a conical internal connection

et al. 2016

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The fit of the implant-abutment interface was assessed by the metallographic technique and by scanning electron microscopy (SEM), using solid abutment types at different torque levels. Forty Morse taper connections and forty solid abutments were used at different torque levels (repeated after 10 minutes) in the following groups (n = 10): 25 Ncm (group g1), 30 Ncm (group g2), 35 Ncm (group g3), and 40 Ncm (group g4). The samples were embedded in a metallographic resin, sectioned lengthwise, and polished. SEM images were used to measure the linear contacts and the fits between abutments and the internal walls of the implant. The overall mean gap and standard deviation were as follows: 9.0 ± 1.36 µm for group g1, 7.9 ± 2.81 µm for group g2, 2.0 ± 0.76 µm for group g3, and 0.3 ± 0.40 µm for group g4. A significant difference was observed in the average fit values between the groups (p < 0.05). The linear area of contact between the abutment and the implant increased as torque augmented. This study demonstrated that higher insertion torque values in a conical internal connection increase the fit (contact) of the implant-abutment interface.

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“…Both these complications occur through three main mechanisms -screw joint relaxation; [50][51][52] poor component fit; [53][54][55] and excessive loading of the screw joint. [56][57][58] Relaxation, or screw settling, is the result of plastic deformation within the screw joint and a major reason for screw loosening.…”

Section: Discussionmentioning

confidence: 99%

Cross‐pinning: the philosophy of retrievability applied practically to fixed, implant‐supported prostheses

Gervais¹,

Hatzipanagiotis²,

2008

Australian Dental Journal

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Biologic and technical complications are widely reported in the dental literature and often compromise the functional and/or aesthetic features of fixed, implant‐supported prostheses. Managing complications without damaging or destroying a restoration is an obvious advantage of implant‐based dentistry where the option of prosthetic retrievability is almost always available. The technique of cross‐pinning uses a transverse screw to secure a prosthesis to a milled implant abutment, allowing prosthetic retrievability irrespective of dental implant alignment. This study presents guidelines for cross‐pinning implant‐supported prostheses based on resistance form, screw mechanics and natural tooth contours. The technical aspects of cross‐pinning are also discussed using examples from four implant systems.

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The effect of repeated torque and salivary contamination on the preload of slotted gold implant prosthetic screws

Cited by 78 publications

References 6 publications

Retrieval of a fractured abutment screw thread from an implant: a case report

Retrieval of a fractured abutment screw thread from an implant: a case report

Effects of different torque levels on the implant-abutment interface in a conical internal connection

Cross‐pinning: the philosophy of retrievability applied practically to fixed, implant‐supported prostheses

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