Effects of tooth root contact on the stability of orthodontic anchor screws in the maxilla: Comparison between self-drilling and self-tapping methods

Iwai, Hiroaki; Motoyoshi, Mitsuru; Uchida, Yasuki; Matsuoka, Miho

doi:10.1016/j.ajodo.2014.12.017

Cited by 14 publications

(3 citation statements)

References 37 publications

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“…Motoyoshi et al [ 6 ] recorded the target condition for 20.5 or 17.1 % for screws placed respectively with pre-drilling or self-drilling techniques. Almost identical findings were recorded by the same research group in other publications on this topic [ 3 , 14 ]. Accurate positioning methods are available to reduce implant-root contact, but these techniques are complex, expensive, and require additional radiographs [ 4 , 15 – 20 ].…”

Section: Introductionsupporting

confidence: 86%

Insertion torque recordings for the diagnosis of contact between orthodontic mini-implants and dental roots: a systematic review

Reynders

Ladu²,

Ronchi³

et al. 2016

Syst Rev

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BackgroundMost orthodontic mini-implants (OMIs) are inserted between dental roots. The prevalence of contacting these structures is high. Such contacts can cause permanent root damage and implant instability. Increased torque levels during implant insertion (the index test) could be a more accurate and immediate measure for diagnosing implant-root contact (the target condition) than radiographs (the reference standard) and could ultimately lead to a reduction or elimination of X-ray exposure. To address this issue, we asked three questions: (1) whether OMIs with root contact had higher insertion torque values than those without, (2) what is the accuracy of the index test compared with the reference standard to diagnose the target condition and what are the adverse effects of the index test, and (3) whether intermediate torque values have clinical diagnostic utility.MethodsMethods were conducted according to our published protocol, which was based on the PRISMA-P 2015 statement. We applied broad spectrum eligibility criteria that included randomized and non-randomized studies on clinical, animal, and cadaver models. Not including such models would be unethical because it could slow down knowledge creation on the adverse effects of implant insertion. We conducted searches in more than 40 electronic databases including MEDLINE and 10 journals were hand-searched. Grey literature and reference lists were also searched. All research procedures were conducted independently by three reviewers. Authors of selected studies were contacted to obtain additional information. Outcomes on the three different research models were analysed separately. Systematic error was assessed with the Cochrane ‘Risk of bias tool’ for non-randomized studies.ResultsOne clinical, two animal, and two cadaver studies fulfilled the eligibility criteria of the first research question. All studies and subgroups demonstrated higher insertion torque values for OMIs with the target condition than those without. Mean differences (MD) between these effect estimates were statistically significant in one beagle model (MD, 4.64; 95 % CI, 3.50 to 5.79) and three subgroups of cadaver studies (MD, 2.70; 95 % CI, 1.42 to 3.98) (MD, 3.97; 95 % CI, 2.17 to 5.78) (MD, 0.93; 95 % CI, 0.67 to 1.20). Highest mean differences were identified in most self-drilling compared with pre-drilling groups. Clinical heterogeneity between studies was high, and many items were underreported. All studies except one cadaver study scored at least one domain as ‘serious risk’ of bias. No studies addressed the second research question. One cadaver study addressed the third question which showed the importance of recording torque levels during the entire implant insertion process. Responses of contacted authors were helpful, but often difficult to obtain. Implants fractured in one animal and in one cadaver model.ConclusionsAll eligible studies scored higher insertion torque values for implants with root contact than those without, but none of these studies assessed the diagnostic accura...

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Section: Introductionsupporting

confidence: 86%

Insertion torque recordings for the diagnosis of contact between orthodontic mini-implants and dental roots: a systematic review

Reynders

Ladu²,

Ronchi³

et al. 2016

Syst Rev

View full text Add to dashboard Cite

show abstract

“…[46][47][48] A recent study by Iwai et al concluded that avoidance of tooth root contact may improve the success rate more in the selfdrilling method than in the self-tapping method of screw insertion. 49 Poor oral hygiene Accumulated plaque around the head of a miniscrew will initiate mucosal inflammation which will in turn affect the integrity of the underlying cortical bone and subsequently lead to loosening and failure. Gentle and frequent brushing will keep the area around the miniscrew head clean and free of food debris.…”

Section: Root Damagementioning

confidence: 99%

The use of Miniscrews in Orthodontics: A Review of Selected Clinical Applications

Mizrahi¹

2016

Prim Dent J

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This paper provides a brief review of the history and development of mini screws and presents its structural features, with particular reference to the screw sizes relevant to clinical orthodontics, site selection and the different placement techniques. It covers the clinical applications of miniscrews, incorporating the principle of direct and indirect anchorage as well as the use of intraoral auxiliaries for distal movement of molars. The role of palatal miniscrews for retraction of anterior teeth, and when used in combination with buccal miniscrews for intrusion of buccal teeth is also covered along with the possible causes of miniscrew failure. Finally, a conclusion is put forward that the use of miniscrews in orthodontics has a valid clinical basis and will enhance the scope of orthodontic practice.

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“…Alsamak [2] recense les sites les plus favorables à l'insertion des vis d'ancrage. Enfin, il semble qu'une proximité radiculaire soit plus préjudiciable à la tenue des vis auto-forantes qu'à leurs homologues non auto-forantes [19,46].…”

Section: Proximité Radiculaireunclassified

Échecs des ancrages osseux

Mer¹,

Brézulier

Sorel

2016

Orthod Fr

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L’objectif de cet article est de lister les circonstances pouvant être à l’origine des échecs dans l’utilisation des ancrages osseux temporaires en orthodontie et, par conséquent, d’essayer de définir des critères de bon usage. Une revue de littérature et l’analyse de cas cliniques ont servi de base à notre réflexion. Il en ressort qu’avec une bonne connaissance des indications dans le choix des vis, de leur emplacement et des protocoles de mise en place, associée à une analyse des mécaniques orthodontiques, les ancrages osseux sont aujourd’hui un outil essentiel de l’orthodontiste, permettant des mouvements autrefois irréalisables, ou stabilisant des mouvements parasites qui rendent nos traitements plus fiables et plus efficients.

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Effects of tooth root contact on the stability of orthodontic anchor screws in the maxilla: Comparison between self-drilling and self-tapping methods

Cited by 14 publications

References 37 publications

Insertion torque recordings for the diagnosis of contact between orthodontic mini-implants and dental roots: a systematic review

Insertion torque recordings for the diagnosis of contact between orthodontic mini-implants and dental roots: a systematic review

The use of Miniscrews in Orthodontics: A Review of Selected Clinical Applications

Échecs des ancrages osseux

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