Microtornillos vs máximo anclaje convencional. Comparativa en el tiempo de tratamiento en casos de extracciones

Résumé

Introduction: the aim of this work is to compare the treatment time in cases of extractions using conventional anchorage or the use of microscrews. Material and methods: retrospective study including orthodontic patients treated with premolar extractions (33 men, 47 women, mean age 18 years) with a median age of 18.5. Patients who have undergone orthodontic treatment with multibracket fixed appliances with first premolar extractions, who have not had previous orthodontic or orthopedic treatment, were recruited from the Alfonso X University specialty clinic. Inclusion criteria: patients of the university master's degree in orthodontics (MUO), patients who present complete records at the beginning and end of treatment, patients who end up in correct class I at the end of treatment, patients in the second phase of treatment with multibracket fixed appliances, patients with therapeutic extractions of first bicuspids during orthodontic treatment. Exclusion criteria: patients with previous orthodontic or orthopedic treatment, patients in the first phase of treatment, patients who have had micro-screw failure, patients who have failed anchorage, patients who do not attend regular check-ups. The appropriate test of homogeneity of discrete distributions (Chi-Square Test or Likelihood Ratio) was used. The appropriate linear or nonparametric model was applied according to compliance with the application criteria (t-test/ANOVA or Mann-Whitney-Wilcoxon test/Kruskal-Wallis test). Results: there were no statistically significant differences in the mean treatment time of patients treated with micro-screws compared to patients who were provided with conventional anchorage. The mean treatment time is 17.8 months, with a median of 15 months and a range of 6 to 48 months. A statistically significant difference between the type of anchorage and age was observed.