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Morphology changes of maxillary molar distalization by clear aligner therapy / Cambios de la morfología en la distalización de molares maxilares mediante terapia con alineadores transparentes
Cui, Jia-Yu; Ting, Liu; Cao, Yu-Xin; Sun, Dan-Xu; Bing, Li; Wu, Xiu-Ping.
  • Cui, Jia-Yu; Shanxi Medical University. School of Dentistry. Department of Orthodontics. Taiyuan. CN
  • Ting, Liu; Shanxi Medical University. School of Dentistry. Department of Orthodontics. Taiyuan. CN
  • Cao, Yu-Xin; Shanxi Medical University. School of Dentistry. Department of Orthodontics. Taiyuan. CN
  • Sun, Dan-Xu; Kyungpook National University. School of Dentistry. Department of Orthodontics. Daegu. KR
  • Bing, Li; Shanxi Medical University. School of Dentistry. Department of Orthodontics. Taiyuan. CN
  • Wu, Xiu-Ping; Shanxi Medical University. School of Dentistry. Department of Orthodontics. Taiyuan. CN
Int. j. morphol ; 40(4): 920-926, 2022. ilus, tab
Article in English | LILACS | ID: biblio-1405233
ABSTRACT

SUMMARY:

To evaluate the skeletal, dento-alveolar and soft tissue morphology changes after maxillary molar distalization by clear aligner therapy and identify the significant efficacy of molar distalization,18 patients in conformity with the inclusion criteria were selected. Pre- and post-treatment Cone Beam Computed Tomography (CBCT) were examined to measure the angular and linear parameters. All subjects were completed non-extraction clear aligner treatment by distalizing molars. A paired-t test and independent-samples t-test were performed to observe the difference between before and after treatment and the difference between the first molar and second molar respectively. P-values <0.05 were considered statistically significant. Predicted movement rate was calculated by the formula (actual movement(mm)/planned movement(mm)) x100%. Most variables of pre- and post-treatment showed no statistical difference(P<0.05), excepting SNA angle (P<0.05) and Upper lip/E-line linear (P<0.01) due to incisor retraction. The first and second molar revealed a translation movement without significant tipping and vertical movement. Clear aligners provided a high predictability (83.44 %) of distalization the maxillary first molar, and 85.14 % of the maxillary second molar. Clear aligners can effectively achieve distal displacement of molars.
RESUMEN
RESUMEN Se seleccionaron 18 pacientes, de acuerdo con los criterios de inclusión, para evaluar los cambios en la morfología esquelética, dentoalveolar y de los tejidos blandos después de la distalización de los molares maxilares, mediante la terapia con alineadores transparentes e así identificar la significativa eficacia de la distalización de los molares. Se examinó a través de tomografía computarizada de haz cónico (CBCT) antes y después del tratamiento para medir los parámetros angulares y lineales. Todos los sujetos completaron el tratamiento con alineadores transparentes sin extracción mediante la distalización de los molares. Se realizó una prueba t pareada y una prueba t de muestras independientes para observar la diferencia entre antes y después del tratamiento y la diferencia entre el primer molar y el segundo molar, respectivamente. Los valores de p<0,05 se consideraron estadísticamente significativos. La tasa de movimiento prevista se calculó mediante la fórmula (movimiento real (mm)/movimiento planificado (mm)) x 100 %. La mayoría de las variables de pre y postratamiento no mostraron diferencia estadística (P<0,05), excepto el ángulo SNA (P<0,05) y el labio superior/línea E lineal (P<0,01) debido a la retracción del incisivo. El primer y segundo molar revelaron un movimiento de traslación sin inclinación significativa y movimiento vertical. Los alineadores transparentes proporcionaron una alta previsibilidad (83,44 %) de la distalización del primer molar superior y del 85,14 % del segundo molar superior. Los alineadores transparentes pueden lograr efectivamente el desplazamiento distal de los molares.
Subject(s)


Full text: Available Index: LILACS (Americas) Main subject: Tooth Movement Techniques / Cephalometry / Malocclusion / Molar Type of study: Prognostic study / Risk factors Limits: Humans Language: English Journal: Int. j. morphol Journal subject: Anatomy Year: 2022 Type: Article Affiliation country: China / South Korea Institution/Affiliation country: Kyungpook National University/KR / Shanxi Medical University/CN

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Full text: Available Index: LILACS (Americas) Main subject: Tooth Movement Techniques / Cephalometry / Malocclusion / Molar Type of study: Prognostic study / Risk factors Limits: Humans Language: English Journal: Int. j. morphol Journal subject: Anatomy Year: 2022 Type: Article Affiliation country: China / South Korea Institution/Affiliation country: Kyungpook National University/KR / Shanxi Medical University/CN