Skip to main content
OpenTrials
Completed

NCT Number: NCT07269951

The Bone Thickness of Infrazygomatic Crest Was Measured on CBCTs

This study will be done on 95 patients with CBCTs retrospectively, to evaluate the bone depth of infrazygomatic crest region for selecting suitable size of miniscrews and proper insertion angle clinical guide in the infrazygomatic crest without injuring the mesiobuccal root of the maxillary first molar.

Completed

Looking for future studies?

Notify Me

Key information

Conditions

Miniscrew Placement

Age range

16 year–35 year

Sex eligibility

All sexes

Study type

Observational

Primary location

Faculty of Dentistry Cairo University

Cairo, Egypt

About this study

CBCTs of 95 patients were collected retrospectively from archives of Faculty of Dentistry, Cairo University, that were requested for different dental purposes. The thickness of the IZC was measured above mesio-buccal root of upper 6 (U6MB), above disto-buccal root of upper 6 (U6DB) and contact point between upper 6 and 7 roots (U6-7). The distance from point of entry of miniscrew to the occlusal plane, that saves roots from injury, was measured. Then, the angle of miniscrew insertion in relation to the occlusal plane was measured at maximum thickness available together with point of entry in relation to the occlusal plane. The IZC thickness of right and left sides of each patient was compared, also compared in males and females. Kruskal-Wallis test, Paired Wilcoxon signed rank test & Spearman correlation were used to analyze results

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Patients having full permanent dentition
  • all cases were indicated for CBCT for their orthodontic treatment
  • Patients with sound dentition

Exclusion criteria

  • craniofacial anomalies and facial asymmetries
  • Unclear CBCT
  • mixed dentition
  • Patients with systemic bone disorders

Treatment and study plan

Primary outcomes

  1. measure bone thickness of infrazygomatic crest

    Time frame: from enrollment to the end of taking measurements at 8 weeks

    the bone thickness will be measured on CBCT from coronal slice at 3 points : above mesio-buccal root of upper first molar, above disto-buccal root of upper first molar and between upper first and second molars contact points

Secondary outcomes

  1. proper angulation of miniscrew insertion

    Time frame: from enrollment to the end of taking measurements at 8 weeks

    a clinical guide to clinicians was done to guide the clinician the proper angulation of long axis of miniscrew and occlusal plane

  2. check asymmetry of right and left sides per patient

    Time frame: from enrollment to the end of taking measurements at 8 weeks

    the right and left bone thickness was measured to detect any asymmetry between both sides

Sponsors and collaborators

Lead sponsor

Cairo University

Other

Registry information

Official study title

Assessment of Bone Thickness in the Infrazygomatic Crest and Proper Insertion Angle for Miniscrew Positioning: A Retrospective CBCT Study

Acronym: IZC

Important dates

Study start
2025
Primary completion
2025
Study completion
2025
First posted
Dec 8, 2025
Registry last updated
Dec 8, 2025

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

Related clinical trials

Published trials that share one or more normalized conditions with this study.