Midline versus bilateral miniscrews with clear aligners for intrusion of maxillary anteriors: A finite element model analysis
Year: 2025
Type: article
Abstract: Objectives: This study compares stress distribution on maxillary dentition, periodontal ligament (PDL), alveolar bone, and aligners using a midline versus bilateral miniscrews to intrude maxillary anteriors for deep bite correction with clear aligner therapy. Material and Methods: A 3D computer-aided design (CAD) model of the maxilla and maxillary dentition with aligner was created using computer-aided three-dimensional interactive application version 5 release 7 (CATIA V5R7). Two models with different miniscrew configurations were made (M1 = single midline miniscrew and M2 = two miniscrews bilaterally). This assembly was subjected to 50 g, 100 g, 150 g, 200 g, and 300 g loads using elastics. M1 was subjected to loading on one implant, and M2, the loads were equally divided on two implants bilaterally. Stress distribution and displacement on the assembly (aligner, maxillary dentition, PDL, and alveolar bone) were evaluated and compared. Results: The equivalent von Mises stress proportionally increased in both models (M1 and M2) with an increase in loading force. The stresses and displacement with the M1 model were almost twice as compared to M2 for the same loading force, with M2 showing stress on the canine. M2 provides better control over proclination with the same magnitude of load. Conclusion: Using miniscrews along with clear aligners resulted in variable stress distribution patterns, with the M2 configuration showing even distribution of stresses. Greater displacement with M1 in the sagittal direction resulted in labial flaring. M1 can be used in cases with retroclined incisors, while M2 can be used in cases requiring canine intrusion.
Source: APOS Trends in Orthodontics
Language: English
Subfield: Orthodontics
Field: Dentistry
Domain: Health Sciences
Open Access status: diamond
OpenAlex ID: W4413201495