Von Mises stresses on Mushroom-loop archwires for incisor retraction: a numerical study.

Objective: To perform a numerical simulation using FEM to study the von Mises stresses on Mushroom archwires.

Methods: Mushroom archwires made of titanium-molybdenum alloy with 0.017 x 0.

Treatment of a Class I deep bite malocclusion in a periodontally compromised adult.

Background: Light forces and an appropriate force system should be used to treat adult patients with periodontal disease.

Aims: To describe the orthodontic treatment of an adult patient with a Class I deep bite malocclusion, horizontal and vertical bone loss and root resorption.

Methods: After periodontal surgery and initial alignment of the maxillary incisors with a fixed orthodontic appliance the maxillary incisors were splinted together as a single unit.

Experimental force definition system for a new orthodontic retraction spring.

A new geometry of orthodontic retraction spring was experimentally studied through an electronic device (platform for measuring forces), using strain gauges that were adapted to cantilever beams. The sample consisted of 36 titanium-molybdenum springs, divided into three groups of 12 springs each. The springs were produced with different cross sections of 0.