OrthoTiN TMJ System - Joint Replacement

Orthotin patient specific joint replacement system

The OrthoTiN TMJ system is designed with focus on matching patient unique anatomy.The implants geometry is based on the 3D skull model that is generated from the CT Scan of the specific patient.OrthoTiN Prosthesis are intended to provide a custom bone fitting surface replacements for the joint maintaining maximum bone stock.

Downloads For Providers

OrthoTiN TMJ Patient Brochure ^pdf

The prosthesis are divided into a ramus and fossa component.

Ramus Component

The Ramus component is constructed from a single piece of titanium bar stock and is used to replace the condylar head while being secured to the lateral side of the mandible. In order to provide a durability for articulating surface of the implant, a titanium nitride (C-TiN-C) surface coating is applied to the entire component.

Fossa Component

The fossa is composed of solid titanium alloy featuring eminence flange and a ultra-high molecular weight polyethylene (UHMWPe) bearing insert to replace the glenoid fossa and articulate with the ramus prosthetic condylar head. Each prosthesis is individually fabricated to the unique anatomy of the patient. Customizing the implant fit allows for excellent adaptation to these discrepant features providing maximum fixation and optimum function of the TMJ joint.

Advantages of custom TMJ Design

Model of facial skeleton

One of the advantages of a custom system is the familiarity of the patient’s anatomy that the design team develops throughout the generation of the anatomical model as well as the prosthesis design. Using OrthoTiN’s CT scan protocol results in scan data that best approximates patient anatomy and leads to a more accurate device. With an accurate representation of the patient’s maxilla and mandible anatomy, surgical planning becomes more accessible and reliable. Osteotomy planning, occlusion adjustment, and any patient specific considerations can be addressed. Also a 3D model can be printed for verification of the design as well as for surgical reference and planning.

Contact stress (Unit loading, Von Mises) comparison between spherical

Custom fossa component allows for exacting fit

A patient-specific fossa component has the advantage over a standard component in that the implant is in direct contact at each point along the anatomical interface creating stability and reducing micromotion. This also reduces stress within the component by more efficiently transferring joint loads to the bone. In addition, there are certain circumstances in which the patient has anatomical deficits and a standard component cannot be used. All these advantages lead to a more robust and longer-lasting joint replacement solution.

Custom ramus component allows fit to irregular mandible

A standard flat surface on the ramus component may not be suited for patients who have irregularly shaped or mutilated skeletal anatomy. Custom components allow for control over the shape of the condylar component, the flexibility of positioning of the screws, and the adaptation of the internal surface. The specific design can be altered to increase fixation or improve positioning of the screws, to accommodate the best bone stock, bone thickness, or to account for the position of the mandibular nerve. If the occlusion can be improved by changing the position of the mandible, the design of the ramus component can be altered accordingly before surgery. Examples include mandibular advancement and lengthening of the posterior vertical height.