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Implementation of 3D imaging in precise bracket positioning

Thesis

Last updated: 06 Feb 2023

Subjects

-

Tags

Orthodontics

Authors

El-Temami, Ahmad Medhat

Accessioned

2018-08-26 05:55:12

Available

2018-08-26 05:55:12

type

M.Sc. Thesis

Abstract

Objectives: The aim of the current study was to implement 3D imaging in order to improve bracket positioning techniques. The study involved checking the validity of current techniques for bracket positioning in addition to innovating a new method for transferring CBCT guided bracket position to patient's mouth.Materials and Methods: This was a retrospective study. The sample of the study consisted of 10 patients who were undergoing treatment in Outpatient clinic, Orthodontic Department, Cairo University .A copy of their CBCT images and three duplicates of their original study models were obtained. The long axis of each tooth and the slot distances depending on MBT bracket positioning recommendations were drawn and defined with 0.016 stainless steel wires. The models were scanned by CBCT scanner. The model preparation procedures were repeated on the second duplicate by the same operator after one week and by another operator on the third duplicate. The long axis of each tooth on the model CBCT image was compared to the long axis of each tooth on the original patients' CBCT images using Antomage Image processing software. Also the slot distance on each tooth in the model CBCT image was measured on the Anatomage software. Manual registration was used for accurate superimposition and comparison. Superimposition was done using best fit technique. Superimposition was done between the patients' CBCT images and their three duplicated models' CBCT images. Additionally a new method of indirect bonding was introduced utilizing CBCT, Mimics software and 3D printing technology. Results: In mandible, the deviation angle of the right canine and the right second premolar were the greatest angle, while the left central incisor was the least variable. In maxilla, the deviation angle of left canine and the left second premolars were the greater angle while the right central incisor was the least variable. There was no statistically significant difference between the slot distance drawn on the model and that measured on the model CBCT images. Regarding the intra- and inter observer agreements, almost half of the teeth showed high agreements.Conclusion: Depending only on the clinical crown in identifying the long axis of the tooth needs revision. CBCT is a valuable treatment tool which can be used to improve bracket positioning techniques. Clinical experience remains the major factor that could affect precise bracket position.

Issued

1 Jan 2014

DOI

http://dx.doi.org/10.21473/iknito-space/40296

Details

Type

Thesis

Created At

28 Jan 2023