The Bone Thickness of Infrazygomatic Crest Was Measured on CBCTs (IZC)

Cairo University (CU)

Status: Completed

Conditions: Miniscrew Placement

Study type: Observational

Funder types: Other

Identifiers

NCT07269951

31-3-22

Details and patient eligibility

About

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.

Full 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

Enrollment: 95 patients

Sex: All

Ages: 16 to 35 years old

Volunteers: No Healthy Volunteers

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

Trial design

95 participants in 1 patient group

95 patients were randomly chosen constituting both males and females

Description:

Following the inclusion and exclusion criteria, 95 patients were randomly chosen constituting both males and females with an age range of 20-35 years old (58 females and 37 males). CBCTs were acquired in the same manner, using an i-CAT scanner with 110 kVp, 60 mA, 0.3-mm voxel size, a scan time of 18 seconds, and a field of view of 17x 23 cm. CBCT measurements were analyzed using Invivo 6 (Anatomage, Inc., Santa Clara, Calif). These tomographic images were reoriented so that the natural head position coincided with the true horizontal plane in an attempt to reduce possible errors in head positioning during image acquisition.