Clinical factors correlated with the success rate of miniscrews in orthodontic treatment

Abstract

Miniscrews offer a reliable alternative for anchorage during orthodontic treatment, particularly for non-cooperative patients or periodontal patients with alveolar bone loss. The study aims at assessing the correlation of various clinical indicators with the success or failure of miniscrews used for anchorage during orthodontic treatment. Thirty-four consecutive patients with a cumulative total of 82 miniscrews implanted participated in the study. Generalized Estimating Equations were used to assess the correlation of various factors with success rates. The miniscrew was considered the unit of analysis clustered within site and within patient. The overall success rate of miniscrews was 90.2%. For every additional miniscrew used in a patient's oral cavity, the success rate was reduced by 67%. Retromandibular triangle and palatal placement and in movable mucosa resulted in lower success rate. The miniscrew length and diameter were found to correlate with success rates. Orthodontic force applied on miniscrews for uprighting purposes showed a lower success rate than that used for retraction. This study revealed that miniscrews present high success rates. The number of miniscrews used per patient, the miniscrew site placement, the soft tissue type of placement, the miniscrew length and diameter as well as the orthodontic force applied on the miniscrew showed significant correlation with success rates.

Success rates and factors associated with failure of temporary anchorage devices: A prospective clinical trial

“…The area between the upper first premolar and second premolar in the maxilla and mandible showed a higher success rates, whereas the area between the first molar and second molar in the maxilla and mandible had the lowest success rate. These findings were similar to those found in other research …”

“…Watanabe et al. and Lai and Chen also concluded that the success rate was higher if placed in the attached gingiva than movable mucosa …”

“…Since the introduction of TADs to the science of orthodontics, many studies have been carried out to identify some of the factors associated with TAD failure . TADs have been proven to have a good success rate and aid in achieving some important goals, as their use has increased to accommodate many of the functions that have been previously difficult to achieve.…”

“…This conclusion was contradicted by Watanbe et al., who considered root proximity as a major cause of failure. In a prospective study, Topouzelis and Tsaousoglou pointed out that length and diameter might aid in the success rate of TAD . They mentioned that palatally‐placed TAD had fewer success rates, whereas those placed in the attached gingiva had a 24 times greater success rate than those placed on movable mucosa.…”

Revisiting the stability of mini-implants used for orthodontic anchorage

“…Another study reported that the number of miniscrews used per patient is correlated with miniscrew failure rate. 37 Further studies are needed to draw a more definitive conclusion.…”