The Bone Thickness of Infrazygomatic Crest Was Measured on CBCTs

Cairo University95 enrolled

Overview

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.

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

Study Type

OBSERVATIONAL

Enrollment

Conditions

Miniscrew Placement

Eligibility

Sex: ALLMin age: 16 YearsMax age: 35 Years

Medical Language ↔ Plain English

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

Locations (1)

Faculty of Dentistry Cairo University

Cairo, Egypt

Outcomes

Primary Outcomes

measure bone thickness of infrazygomatic crest

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

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

Secondary Outcomes

proper angulation of miniscrew insertion

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

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

check asymmetry of right and left sides per patient

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

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

Data from ClinicalTrials.gov

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