Miniscrew Placement
Conditions
Keywords
miniscrew, TAD, infrazygomatic crest
Brief summary
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.
Detailed description
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
Interventions
None listed
Sponsors
Cairo University
Study design
Observational model
CASE_ONLY
Time perspective
RETROSPECTIVE
Eligibility
Sex/Gender
ALL
Age
16 Years to 35 Years
Healthy volunteers
No
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
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| measure bone thickness of infrazygomatic crest | 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
| Measure | Time frame | Description |
|---|---|---|
| proper angulation of miniscrew insertion | 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 |
| check asymmetry of right and left sides per patient | 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 |
Countries
Egypt
Outcome results
None listed