Optimal asymmetric thread for orthodontic microimplants: Laboratory and clinical evaluation

To investigate the performance of microimplants incorporating a newly designed asymmetric thread. Three microimplants were compared. The control group comprised microimplants with the original v-shaped thread. The two experimental groups (Taper 1.0 and Taper 1.25) comprised prototype microimplants c...

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Bibliographic Details
Published in:The Angle orthodontist 2015-07, Vol.85 (4), p.585-590
Main Authors: Alrbata, Raed H, Ha, Do-Won, Yu, Wonjae, Kyung, Hee-Moon
Format: Article
Language:English
Subjects:
Cancellous Bone - anatomy & histology
Case-Control Studies
Cortical Bone - anatomy & histology
Dental Implants
Dentistry
Humans
Mandible - anatomy & histology
Materials Testing
Maxilla - anatomy & histology
Original
Orthodontic Anchorage Procedures - instrumentation
Orthodontic Appliance Design
Stress, Mechanical
Surface Properties
Time Factors
Torque
Torsion, Mechanical
Vibration
Young Adult
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Summary:To investigate the performance of microimplants incorporating a newly designed asymmetric thread. Three microimplants were compared. The control group comprised microimplants with the original v-shaped thread. The two experimental groups (Taper 1.0 and Taper 1.25) comprised prototype microimplants constructed with the new asymmetric thread; the Taper 1.25 specimens had a 1.25-mm-long and sharper tip, while the Taper 1.0 and control groups had a less sharp 1-mm tip. Two specially designed artificial bone blocks mimicking soft (maxillary) and hard (mandibular) bone were used to evaluate the microimplant insertion characteristics and postinsertion lateral stability. The peak insertion torque, insertion time, Periotest value (PTV), and torsional strength were measured. Then the microimplants were evaluated clinically over a 3-month period. Significant differences in peak insertion torque, insertion time, and PTV were observed and favored the experimental groups. Although statistically insignificant, the clinical success rate was also higher in the Taper 1.25 experimental group than in the control group (87.2% vs 75.6%). The better performances of the experimental microimplant, under both laboratory and clinical conditions (although statistically insignificant in the latter), demonstrate the superiority of the new asymmetric thread.
ISSN:0003-3219
1945-7103
DOI:10.2319/050314-320.1