Correction of the curve of spee using clear aligner therapy: A finite element analysis of three lower anterior intrusion protocols.

ABSTRACT:

Background

Correction of the curve of Spee (COS) often requires lower anterior intrusion, which remains one of the least accurate tooth movements in clear aligner therapy (CAT). This limited accuracy may be influenced by the anchorage system or the design of the intrusion strategy. This study aimed to evaluate the movement trends and stress distribution in the lower anterior teeth subjected to three different intrusion protocols using finite element analysis (FEA).

Methods

Three-dimensional models of the mandibular dentition, periodontal ligaments (PDLs), bone, attachments, and clear aligners were constructed using Materialise Mimics and Materialise 3-matic software. The assembly of the anatomical structures was developed using Autodesk Inventor, and FEA was performed using

SUBMITTER: Guerrero-Vargas JA 

PROVIDER: S-EPMC12843580 | biostudies-literature | 2026

REPOSITORIES: biostudies-literature