Evidence map›Paper›PMID 25603272›Full record

ArticleThe Angle orthodontist2015

Primary failure rate for 1680 extra-alveolar mandibular buccal shelf mini-screws placed in movable mucosa or attached gingiva.

Chris Chang, Sean S Y Liu, W Eugene Roberts

Registry-linked trialAbstract read
PubMed Full text at PMC Publisher
In one paragraph

Article in The Angle orthodontist, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT07662434 (A Prospective , Split-mouth, Clinical Study of Orthodontic Titanium Miniscrews With Machined and Acid-etched Surfaces.), which is not on this map. Cited by 47 papers.

0numbers the graph read from it
0cells of the map it votes in
47citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

NCT07662434 nacompletednot on this mapstarted 2024, after this paper: background citation

A Prospective , Split-mouth, Clinical Study of Orthodontic Titanium Miniscrews With Machined and Acid-etched Surfaces.

TypeinterventionalSponsorFoundation University IslamabadRan2024 to 2025Enrolled30ConditionsMalaligned Teeth, CrowdingArmsminiscrews placement
3 · Its place in the literature

Who cites it

47 citing papers in PubMed.

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  13. Extra-alveolar miniscrews: are all brands similar?Dental press journal of orthodontics · 2025
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  16. Review
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

3 authors.

Chris Changa   Private Practice, Beethoven Orthodontic Center, Hsinchu City, Taiwan.
Sean S Y Liub   Assistant Professor, Department of Orthodontics and Orofacial Genetics, Indiana University School of Dentistry, Indianapolis, Ind.
W Eugene Robertsc   Professor Emeritus of Orthodontics and Adjunct Professor of Mechanical Engineering, Indiana University and Purdue University, Indianapolis, Ind.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

objectiveTo compare the initial failure rate (≤4 months) for extra-alveolar mandibular buccal shelf (MBS) miniscrews placed in movable mucosa (MM) or attached gingiva (AG). MATERIALS AND

methodsA total of 1680 consecutive stainless steel (SS) 2 × 12-mm MBS miniscrews were placed in 840 patients (405 males and 435 females; mean age, 16 ± 5 years). All screws were placed lateral to the alveolar process and buccal to the lower first and second molar roots. The screw heads were at least 5 mm superior to the soft tissue. Loads from 8 oz-14 oz (227 g-397 g, 231-405 cN) were used to retract the mandibular buccal segments for at least 4 months.

resultsOverall, 121 miniscrews out of 1680 (7.2%) failed: 7.31% were in MM and 6.85% were in AG (statistically insignificant difference). Failures were unilateral in 89 patients and bilateral in 16. Left side (9.29%) failures was significantly greater (P < .001) compared with those on the right (5.12%). Average age for failure patients was 14 ± 3 years.

conclusionMBS miniscrews were highly successful (approximately 93%), but there was no significant difference between placement in MM or AG. Failures were more common on the patient's left side and in younger adolescent patients. Having 16 patients with bilateral failures suggests that a small fraction of patients (1.9%) are predisposed to failure with this method.

Indexed as

Bone ScrewsEquipment FailureAdolescentChildFemaleHumansMaleMandibleOrthodontic Anchorage ProceduresRetrospective StudiesYoung AdultAlveolar mucosaAttached gingivaExtra-alveolar orthodontic anchorageMandibular buccal shelfMiniscrewsSkeletal anchorage

Identifiers

PMID25603272
PMCPMC8612035

What OpenQuestion holds

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Registered trials

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.