Patient’s perception on mini-screws used for molar distalization


  • Micéli Guimarães Blaya PUCRS
  • Diego Segatto Blaya PUCRS
  • Magáli Beck Guimarães PUCRS
  • Luciana Mayumi Hirakata PUCRS
  • Marcela Marquezan Universidade Federal de Santa Maria


Orthodontics, Angle Class II malocclusion, orthodontic anchorage procedures


Purpose: The objective of this study was to evaluate and compare the perceived pain intensity, side effects and discomfort related to the moment of placement, during mechanics and removal of a mini-screw for molar distalization in orthodontic treatment. Methods: The sample consisted of 30 adult patients with a mean age of 30 years old, with class II malocclusion subdivision right or left. A mini-screw was installed in each patient, in the maxillary arch to provide a molar distalization. The patients answered a questionnaire to assess their opinions on the treatment. Results: Ninety percent of the patients chose mini-screws over pre-molar extraction (orthodontic camouflage), or the use of an extra-oral appliance (Kloehn cervical traction) or another non-compliance treatment to class II. Aphthous ulcer was the side effect most frequent after placement of the mini-screw (30%). The greatest discomfort was felt during infiltration anesthesia (27%), though 23% reported no discomfort during placement. Eighty-three percent of the patients reported no pain during placement, which may be associated with the degree of satisfaction with the treatment (100%) and recommendation of the procedure to other patients (100%). Conclusion: Mini-screws were well accepted by the patients and were efficient for molar distalization when utilized in association with orthodontic treatment for Class II malocclusion.

Author Biographies

Micéli Guimarães Blaya, PUCRS

Pepartamento de Prótese Dentária. Programa de Pós-Graduação em Odontologia. PUCRS

Diego Segatto Blaya, PUCRS

Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, RS, Brazil

Magáli Beck Guimarães, PUCRS

Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, RS, Brazil

Luciana Mayumi Hirakata, PUCRS

Associate Professor Dental Materials PUCRS -Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, RS, Brazil

Marcela Marquezan, Universidade Federal de Santa Maria

Federal University of Santa Maria






Original Article