Influence of Invisalign precision bite ramp utilization on deep bite correction and root length in adults

Area of Science:

• Orthodontics
• Dental Imaging
• Biomechanical Analysis

Background:

• Skeletal deep overbite presents a significant orthodontic challenge.
• Invisalign technology offers an alternative to traditional fixed appliances for malocclusion correction.
• Precision bite ramps are a feature of some Invisalign systems aimed at enhancing treatment outcomes.

Purpose of the Study:

• To evaluate the efficacy of Invisalign precision bite ramps in correcting skeletal deep overbite.
• To compare root length and volume changes of maxillary anterior teeth between Invisalign with and without bite ramps, and full-fixed appliances.
• To analyze skeletal, dental, and soft-tissue changes associated with different orthodontic approaches.

Main Methods:

• Retrospective analysis of 60 adult patients with skeletal deep overbite.
• Categorization into three groups: Invisalign with bite ramps (IBR), Invisalign without bite ramps (INBR), and full-fixed appliances (FFA).
• Utilized Cone Beam Computed Tomography (CBCT) for pre- and post-treatment measurements of cephalometric variables, root length, and root volume.

Main Results:

• All groups showed significant changes in ANB angle, lower face height, Overbite Depth Indicator (ODI), and U1-SN.
• Invisalign groups (IBR and INBR) exhibited significantly less root length reduction compared to FFA (P < .001).
• The INBR group showed significantly greater root volume reduction and percent volume loss than the IBR group (P < .001), with no significant difference compared to FFA.

Conclusions:

• Invisalign, with or without bite ramps, provides comparable skeletal deep overbite correction to FFA.
• Invisalign treatment results in significantly less reduction in maxillary anterior tooth root length than FFA.
• Precision bite ramps impact root volume and volume loss during orthodontic treatment but do not affect root length preservation.