Comparative Evaluation of Rate of Orthodontic Tooth Movement by Varying the Timing of Therapeutic Extractions in patients Undergoing Fixed Appliance Therapy: An In Vivo study

Kishor Kumar, K N (2020) Comparative Evaluation of Rate of Orthodontic Tooth Movement by Varying the Timing of Therapeutic Extractions in patients Undergoing Fixed Appliance Therapy: An In Vivo study. Masters thesis, Adhiparasakthi Dental College and Hospital, Melmaruvathur.


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AIM OF THE STUDY: This study aims in estimating the rate of tooth movement by mini-implant assisted canine retraction through a simplified Rapid acceleratory phenomenon (RAP) by altering the time of therapeutic extraction. MATERIALS AND METHOD: After approval from institutional review board and clearance from ethical committee (IRB/EC Ref No: 2017-MDS-BR.V-SUD-12/APDCH) the study was initiated. Out patients who reported to the department of Orthodontics, Adhiparasakthi Dental College and Hospital, Melmaruvathur, after completing their informed consent form, a total of 10 patients having class I malocclusion, bimaxillary protrusion who satisfied the inclusion and exclusion criteria and required therapeutic extract ion of both maxillary and mandibular 1st premolars were included in the study. In total 40 samples were obtained 20 (10 control & 10 experimental) in maxilla and 20 (10 control & 10 experimental) in mandible respectively. Patients were randomly assigned to one of the study groups. Intially the extract ion of first premolars in one side of maxilla & mandible per formed and taken as control group (Healed extraction site) and the other side extract ion performed after completion of aligning & levelling stage is taken as experimental group (Recent extract ion site). Allocation of control and experimental group is done in randomly unbiased manner. All the permanent teeth were bonded with 0.022” MBT PRESCRIPTION with auxiliary vertical slot canine brackets. The leveling and alignment was done using the fol lowing sequence of 0.016 NiTi, 0.017*0.25 NiTi, 0.019*0.025 NiTi wires and 0.019*0.025 SS arch wire was placed for a period of 4 weeks and then the experimental side extract ion was performed. Then 24 hours after extraction alginate impressions were taken as a record fol lowed by retract ion phase. In the which mini - screws were used as the source of anchorage and the individual canine retraction was achieved using 9mm NiTi closed coil spring connected from temporary anchorage device to the customized serpentine hook placed in the vertical slot of canine brackets to deliver a force of 100g to produce bodily tooth movement which was checked periodically using dontrix gauge. Alginate impressions were taken at the beginning of the study, immediately before canine retraction, and at 28th, 56th, 84th day after canine retract ion began, to monitor the rate of tooth movement in both arches. The distance between the canine and lateral incisor was assessed before and after canine retract ion at 3 points namely incisal, middle, and cervical third of the crown from palatal aspect on the cast and rechecked to reduce intra and inter examiner error and the results were analyzed statistically. RESULT: The results of the study showed that increase in rate of canine retraction of maxi l la & mandible by 1- fold in experimental side when compared with control side in 28 days. But, the overall rate of tooth movement in experimental side (Recently extracted site) showed less significant (p-value of 0.012) when compared to control side. Which is almost near to the significant value (p - value ≤ 0.005). CONCLUSION: Simplified Rapid acceleratory phenomenon (RAP) is an effective, comfortable, non- invasive and safe procedure to accelerate tooth movement and significantly reduce the duration of orthodontic treatment time.

Item Type: Thesis (Masters)
Additional Information: 241719452
Uncontrolled Keywords: Orthodontic Tooth Movement, Therapeutic Extractions, Fixed Appliance Therapy.
Subjects: DENTAL > Orthodontics and Dentofacial Orthopedics
Depositing User: Subramani R
Date Deposited: 24 Feb 2021 03:50
Last Modified: 24 Feb 2021 13:36

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