The efficiency of mandibular mini-implants in reducing adverse effects of class II elastics in adolescent female patients: a single blinded, randomized controlled trial

Abstract

Background Excessive proclination of lower incisors and other undesirable consequences usually result from the use of class II elastics during orthodontic treatment. The purpose of this study was to attempt to limit the adverse effects of class II elastics by the use of mini implants placed in the mandibular arch in adolescent class II female patients. Methods The sample comprised 28 patients, (a mean age of 15.66 ± 2 years for intervention group and 15.1 ± 2.2 years for conventional group) with one-fourth or one-half unit class II canine relationship. The sample was divided into two equal groups. Randomization was carried out by a computer sequence generator with a 1:1 allocation ratio. In the intervention group, the mini implants were inserted between the lower second premolar and first molar, while the conventional group underwent regular class II elastics therapy. The active elastics treatment time was 8 months for both groups. Results were assessed by measurements from pre- and post-elastics lateral cephalometric radiographs. Results The change in L1 inclination (0.97 ± 0.92°) and L1 AP position (0.31 ± 0.63 mm) did not show a statistically significant difference between the two groups, but a statistically significant difference was found in the U1 retroclination (5.23 ± 1.92°) and U1 distal movement (4.05 ± 1.4 mm) [P ˂ 0.001] and [P ˂ 0.05] respectively in favor of the intervention group. Conclusion Mini-implants in conjunction with class II elastics had no skeletal effect, mainly dentoalveolar and it did not prevent the proclination of lower incisors. There was more distal movement in the upper incisors in the skeletal anchorage group which helped in enhancing the camouflaging of class II malocclusion. Trial registration Trial registered “FUE.REC (10)/10-2018” at the FUE registration council for clinical trials/IOP Orthodontic Program October 2018.

Tratamiento temprano ortodóncico/ortopédico en pacientes con anomalías sagitales de clase II. Una revision.

“…Resultados similares se mostraron en el estudio de El-Dawlatly et al . 12 , donde no se obtuvieron resultados esqueléticos significativos en la utilización de estos dispositivos de anclaje esqueletal situados en la mandíbula en combinación con elásticos. Abdelhady et al .…”

“…U6:Eissa et al ( 2 ) demostraron que el uso de microtornillos con dispositivo Forsus no mejora el crecimiento mandibular hacia adelante ni evita la inclinación labial de los incisivos mandibulares. Resultados similares se mostraron en el estudio de El-Dawlatly et al( 12 ), donde no se obtuvieron resultados esqueléticos significativos en la utilización de estos dispositivos de anclaje esqueletal situados en la mandíbula en combinación con elásticos. y mixta tardía.…”