By Dr. Shaun Weng
Published June 2026
10 min read
Clinical Summary
Add paragraph text. Click “Edit Text” to update the font, size and more. To change and reuse text themes, go to Site Styles.
Content
Does Trimline matter in Aligners?
Straight extended trimline in CAT has been shown to be biomechanically effective across various types of tooth movements (as it’s closer to the CoR).
Higher trimline could be necessary for complex movements such as translation and root movements.
Higher trimline also showed less mandibular incisor proclination and mesial tip of the mandibular molars in class II elastic traction
Maxillary arch expansion with high trimline shows less undesirable buccal tipping of molars compared to those with low trimlines
Disadvantages of high trimlines (case selective) patients with:
• Gingival recession
• Cervical abfraction
• Black triangles
• Severe dental proclination
Have much higher discomfort during aligner removal
High trimlines may also not be suitable for periodontal patients
Higher trimline requires more accurate scanning of the gingiva.
PROTOCOL INFORMATION
DIFFICULTY
Input text here
BIOMECHANICS
Input text here
Continue Reading
BIOMECHANICS
Premolar extraction protocols Part 2 What you may not know…
BIOMECHANICS
Premolar extraction protocols Part 1 What you may not know…
BIOMECHANICS
IPR accuracy exposed! What this study reveals may surprise you
BIOMECHANICS
Does Trimline matter in Aligners?
