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Efficacy of Skeletally Anchored Modified Leaf Expander in Maxillary Molar Distalization
Sponsor: Al-Azhar University
Summary
Background: Distalization in orthodontics is one of conservative treatment modalities that result in gaining space especially in dental orthodontic cases of class ΙΙ molar relationship. Aim: This study aimed to compare the distalization effects of the skeletally anchored modified Leaf Expander versus the skeletally anchored modified conventional Hyrax Expander. Patients and Methods: Thirty patients (15-18 years) requiring maxillary molar distalization were randomly allocated into two groups (n = 15 each). Group 1 received the modified skeletally anchored self-activated Leaf Expander, and Group 2 received the modified skeletally anchored conventional Hyrax Expander. Pre- and post-distalization lateral cephalometric radiographs and digital dental models were analyzed for skeletal, dental, and arch dimensional changes. Treatment duration and adverse events were also recorded. Statistical analysis included paired t-tests and independent t-tests, with Bonferroni correction (α = 0.0045) applied for multiple comparisons. Effect sizes (Cohen's d) were calculated to assess clinical relevance. .
Official title: Efficacy of Skeletally Anchored Modified Leaf Expander Versus Modified Conventional Hyrax in Maxillary Molar Distalization: A Randomized Clinical Trial
Key Details
Gender
All
Age Range
15 Years - 18 Years
Study Type
INTERVENTIONAL
Enrollment
30
Start Date
2024-01-15
Completion Date
2025-08-12
Last Updated
2026-04-16
Healthy Volunteers
Yes
Conditions
Interventions
skeletally anchored Modified Leaf Expander
Intervention Elastic separators were placed mesial and distal to the maxillary first molars bilaterally for 3 days to create space for band placement (19). Appropriate bands were selected and fitted to the molars. An alginate impression was taken with the bands in place, then the bands were removed and repositioned in the impression. The impression was poured in stone to fabricate the working model. Fabrication of the Modified Palatally Anchored Expander Appliance The positions of the screws for skeletal anchorage were determined on the model within a safe square on the anterior palatal area. Four lines were drawn (9): * The first line, 8 mm distal to the incisive papilla, marked the anterior boundary. * The second line, parallel to the first, passed through the distal surfaces of the second premolars to mark the posterior boundary. * Two additional lines, each 8 mm lateral to the median palatal raphe, were drawn perpendicular to the first two lines. The four-point support expander was
Locations (1)
Al- Azhar University
Cairo, Nasr City, Egypt