Comparison of intrusive effect of miniscrew implants versus intrusion arch mechanics on maxillary anterior teeth : A Finite Element Analysis

Abstract

The purpose of this study was to compare biomechanical effect of the anterior teeth intrusion between miniscrew implants and intrusion arch, using Finite element (FE) analysis.

The FE model of maxilla was constructed. Two intrusion mechanics were simulated, sixty grams of intrusive forces were applied from the archwire to the miniscrew implants or intrusion arch. The initial displacement of anterior teeth and first molars and stress distribution of periodontal ligament (PDL) were evaluated.

          In both scenarios, anterior teeth were intruded and proclined labially with the similar amount and pattern. First molars in the intrusion arch mechanic were extruded and tipped distally. Compressive stress was observed at apical-palatal area in the PDL of anterior teeth and along mesial surface of first molars. Stress on the first molars of intrusion arch was 10 times higher than that of miniscrew implants scenario.

           Miniscrew implants and intrusion arch provide same intrusive movement of the anterior teeth.