The goal of this randomized clinical study is to assess the factors associated with the failure rate of infra-zygomatic crest orthodontic mini-screws used for anchorage reinforcement during orthodontic treatment.
Researchers will evaluate the influence of mini-screw length, diameter, oral hygiene status, age, sex, and loading time on the failure rate of infra-zygomatic mini-screws. Mini-screw failure will be assessed clinically by the presence of mobility or loss of stability. Participants will: * Receive fixed orthodontic treatment with a pre-adjusted edgewise appliance system. * Receive infra-zygomatic mini-screws bilaterally for maxillary anchorage reinforcement. * Receive a 10 mm × 1.8 mm mini-screw on one side with immediate loading. * Receive a 12 mm × 2.0 mm mini-screw on the contralateral side with delayed loading. * Receive standardized orthodontic force using elastic power chain. * Undergo CBCT assessment to evaluate the position of the inserted mini-screws. * Be evaluated at baseline and at one-month intervals for three consecutive months to assess mini-screw mobility or failure.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
NONE
Enrollment
30
A 10 mm length and 1.8 mm diameter infra-zygomatic mini-screw will be placed on one side of the maxillary arch and loaded immediately with orthodontic force.
A 12 mm length and 2.0 mm diameter infra-zygomatic mini-screw will be placed on the contralateral side of the maxillary arch and loaded after a delayed period
Bangladesh Medical University (BMU), Dhaka,1000
Dhaka, Bangladesh
To assess the failure rate of infra-zygomatic orthodontic mini-screws over a three-month follow-up period. Failure will be defined as any degree of clinical mobility or loss of stability of the mini-screw.
This is a split-mouth randomized clinical study in which each participant will receive infra-zygomatic mini-screws bilaterally. One side will receive a 10 mm × 1.8 mm mini-screw with immediate loading, while the contralateral side will receive a 12 mm × 2.0 mm mini-screw with delayed loading. The failure rate will be assessed clinically over a three-month follow-up period.Mini-screw failure will be assessed clinically by the presence of mobility or loss of stability.
Time frame: over a three-month follow-up period
To assess the failure rate of infra-zygomatic orthodontic mini-screws over a three-month follow-up period. Failure will be defined as any degree of clinical mobility or loss of stability of the mini-screw
* To compare the failure rate of infra-zygomatic mini-screws according to age and sex of the participants. * To evaluate the influence of mini-screw length on failure rate. * To evaluate the influence of mini-screw diameter on failure rate. * To assess the relationship between oral hygiene status and mini-screw failure. * To compare the effect of immediate and delayed loading on mini-screw failure. * To assess the position of inserted mini-screws using CBCT. * To evaluate the clinical usefulness of infra-zygomatic mini-screws as temporary anchorage devices in orthodontic treatment.
Time frame: Over a three-month follow-up period.
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