# New Classification System of Malocclusions Published in the Journal of Aligner Orthodontics (JAO) by Prof. Gang Shen's Team

- Link: https://www.thailand-business-news.com/pr-news/new-classification-system-of-malocclusions-published-in-the-journal-of-aligner-orthodontics-jao-by-prof-gang-shens-team
- Published: 2026-04-30T12:33:00+07:00
- Author: PR Newswire

SHANGHAI, April 30, 2026 /PRNewswire/ — A seminal research paper titled **"A New
Classification System for Malocclusions with Facial Convexity" **has been officially
published in the 2026 Volume 1 issue of the Journal of Aligner Orthodontics (JAO).
This article, authored by Professor Gang Shen and his orthodontic team, introduces
a transformative diagnostic framework. Building upon the traditional Angle classification
system categorizes and refines the clinical classification of malocclusions with
additional diagnostic elements such as mandibular position and morphology, depth
of curve of Spee and TMJ status, enabling more precise diagnostics and empowering
clinicians to develop optimized treatment strategies.

Professor Gang Shen, the lead author of the paper, serves as the Chief Scientist
of GS Technology (Mandibular Advancement Repositioning Technology) at Smartee Denti-
Technology.

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**Redefining Diagnosis for Complex Malocclusions**

For over a century, the Angle classification system has focused primarily on molar
relationships. Professor Shen’s research expands this scope by integrating facial
appearance, mandibular position and morphology, depth of curve of Spee, and temporomandibular
joint (TMJ) health into a comprehensive diagnostic system.

In the article, Professor Shen’s team investigates the etiopathogenic mechanisms
underlying distinct facial convexity subtypes and proposes evidence-informed, and
subtype-specific treatment strategies. The research focuses on the clinical indications,
biomechanical principles, and standardized operational protocols of mandibular advancement
technology.

The paper explicitly states that leveling the occlusal curve is a critical prerequisite
for achieving the desired mandibular repositioning effect. Furthermore, the paper
emphasizes that the necessity of tooth extraction should be scientifically evaluated
based on refined diagnostic classification, providing clinicians with a robust, 
evidence-based framework for clinical decision-making.

**A New Perspective: Mandibular Morphology Analysis and Risk Assessment**

A significant innovation presented in the study is "Mandibular Morphology Analysis,"
a diagnostic perspective with substantial clinical implications. By systematically
evaluating the overall contour of the mandibular body and the degree of symphyseal
concavity through lateral cephalograms, the research identifies two primary mandibular
morphologies:

 ◦ Flat-Rectangular Mandible: Frequently observed in dentoalveolar facial convexity
   or cases involving mandibular retrusion. These patients typically present a "
   three-depth" bite pattern (deep overbite, deep overjet, and deep curve of Spee)
   and are considered ideal candidates for mandibular advancement therapy.

 ◦ Thick-Triangular Mandible: Common in skeletal facial convexity. This morphology
   is often associated with higher susceptibility of the temporomandibular joint(
   TMJ), where condylar resorption and mandibular retrusion are more frequently 
   observed.

**Theoretical Foundation for GS Technology and S8-SGTB**

The classification system serves as the foundation and rationale for Mandibular 
Advancement Repositioning Technology (MART). As the digital implementation of this
clinical wisdom, Smartee’s GS product line provides standardized solutions for complex
jaw discrepancies. The S8-SGTB, a specialized appliance within the GS product line
mentioned in the research, is designed specifically for treating facial convexity
with "three-depth" bite pattern.

Radiographic follow-up data in the study indicate that MART, when implemented via
systems such as the S8-SGTB, can facilitate adaptive TMJ remodeling. This provides
a viable, non-surgical alternative for achieving sustainable mandibular repositioning
even in adult patients.

"This classification system bridges the gap between initial diagnosis, treatment
planning, and long-term clinical outcomes," said Professor Gang Shen. "By identifying
specific mandibular morphologies, practitioners can make more informed decisions
between conventional extraction therapies and mandibular advancement repositioning."

**About Smartee Denti-Technology**

Founded in 2004, Smartee is the leading provider of clear aligners and digital orthodontic
solutions in China. Headquartered in Shanghai, Smartee has four research & development
centers and four manufacturing bases in China and Spain. By serving over 99,000 
doctors in over 57 countries, Smartee has launched over 10 aligner products catering
to different malocclusion problems for children, adolescents and adults. 

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