Orthodontic Retention on the Maxillary Stability After SARME Using Laser Scanner

Orthodontic Retention on Dental and Skeletal Maxillary Transverse Stability After Surgically Assisted Rapid Maxillary Expansion (SARME)Using Laser Scanner

Status

Completed

Phases

Study type

Interventional

Source

ClinicalTrials.gov

Registry ID

NCT01770782

Enrollment

Registered

2013-01-18

Start date

2009-08-31

Completion date

2011-01-31

Last updated

2013-01-18

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Maxillary Hypoplasia

Keywords

Palatal Expansion Technique, Orthognathic Surgery, Three Dimensional images

Brief summary

The objective of this study was to evaluate the effect of the orthodontic retainer on transverse maxillary dental and skeletal stability after SARME.

Detailed description

Methods: Ninety digitized dental casts of 30 adult patients (18 males and 12 females) submitted to SARME using the Hyrax expansion appliance were evaluated. Patients were distributed into two groups: Group Without Retention (GSC) n = 15; and Group With Retention (GCC) n = 15. In the GCC group, a Transpalatal Arch (TPA) was installed for retention soon after removal of the expander. The dental casts were scanned using a Vivid 9i 3D laser scanner (Konica Minolta, Wayne, NJ). The plaster models were performed preoperatively (T1), 4 months after the expander was removed (T2), and 10 months after the end of the expansion (T3). The distances measured were Inter-Cusps of Premolars and Molars (Inter-Cusp PM) (Inter-Cusp M), Inter-Cervicals of Premolars and Molars (Inter-Cervical PM) (Inter-Cervical M), Inter-WALA edges of Premolars and Molars (PM Inter-BW) (BW Inter-M), palatal height at the molar, and palatal area and volume at T1, T2, and T3.

Interventions

PROCEDURESurgically Assisted Rapid Maxillary Expansion (SARME)

Surgical technique is performed with subtotal LeFort I osteotomy with separation of the pterygomaxillary fissure.The procedure was performed under general anesthesia using endotracheal intubation. Following the osteotomies, the expander screw was activated to 1.6 mm intraoperatively until a small diastema was observed between the upper central incisors. The incision was sutured along two planes.

OTHERLaser Scanner

Laser Scanner Vivid 9i was used to digitize the study models. The 3d virtual dental casts is a reliable copy of the original dental casts. On this virtual casts all measurements (linear, area and volume of the palate) was done to evaluate the stability after SARME.

Study design

Allocation

RANDOMIZED

Intervention model

PARALLEL

Primary purpose

TREATMENT

Masking

SINGLE (Outcomes Assessor)

Eligibility

Sex/Gender

ALL

Age

18 Years to 40 Years

Healthy volunteers

Inclusion criteria

* Adult patients with bilateral transverse maxillary deficiencies greater than 5 mm

Exclusion criteria

* Patients with previous histories of maxillary surgery, * congenital craniofacial malformations and * unilateral transverse maxillary deficiencies

Design outcomes

Primary

Measure	Time frame	Description
Maxillary Stability	up to 10 months after the end of expansion	Laser scanner to create a 3D virtual dental cast

Countries

Brazil

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Feb 4, 2026