Extraoral application of the TRIOS3 - setting foot in the treatment of auricular keloid scars - a step away from impression materials

Abstract

Introduction: The TRIOS3 is one of many intraoral scanners designed to obtain highly detailed impressions within a patient's oral cavity. We have explored the possible use of this scanner in capturing extraoral anatomical structures, such as the external ear. With the TRIOS3, we have facilitated the production of compression clips to aid in the treatment of auricular keloid scars. This is done by 3D printing an exact replica of the affected region of the ear and producing compression clips based on that model. Comparing this to the conventional method of using dental alginate or hydrocolloid, the patient experiences no discomfort or pain with the TRIOS3 scanner while avoiding a messy procedure with impression materials. This also allows for an accurate scan of the targeted area, which can be uploaded to a databank, enabling it to be saved and re-accessed in the future without the need for the patient to go through another impression procedure. Utilizing the TRIOS3 scanner also leads to a reduction in the purchase of impression materials, potentially reducing long-term costs. However, there are some limitations that come with this technology. The device can only capture images from its tip with a range of 17 mm, which limits its ability to scan undercuts and other regions, such as the inner ear. Additionally, this technology, including other necessary hardware, can bear an initial cost of up to 24,000. Staff are also required to undergo training in operating the TRIOS3 scanner and the relevant software. It is also important to note that the battery of the TRIOS3 can provide 20 minutes of continuous scanning, while other devices can last up to 66 minutes. The scanning process takes around 3 minutes in experienced hands. Designing the 3D model takes around 20 minutes per model, and the 3D printing process-including post-curing and washing in IPA-takes approximately 4 hours. The initial application of the TRIOS3 so far has demonstrated both its capabilities and limitations in scanning extraoral regions. Further studies and applications of the TRIOS3 on different regions are recommended to validate its benefits and its potential use in maxillofacial surgery and other relevant departments, with a probable shift away from the use of impression materials.Copyright © 2025