"Three Dimensional Assessment of Maxillary Molars Following Distalization Using Two Different Approaches"

This study is a two-arm, parallel group, prospective randomized clinical trial with the allocation ratio of 1:1. The Consolidated Standards of Reporting Trials (CONSORT statement) were used as a guide for this study.

After reviewing the study protocol, the ethical committee at the Faculty of Dentistry, Ain-Shams University approved the study.

Before treatment was carried out, a detailed written Arabic consent was signed by all the subjects of both groups after full explanation of the aim of the study and the procedures.

This prospective clinical study was conducted on a total of 24 maxillary first molars.

No financial competing interests: This study was part of a Masters' degree in Orthodontics, Faculty of Dentistry, Ain-Shams University.

No financial conflicts of interest were declared. The study was self- funded by the principal investigator.

A sample size of 24 distalizing sites was selected and divided into two groups twelve each:

Group 1: Single coil spring. Group 2: Double coil spring.

Inclusion criteria

• All subjects are free from any dental anomalies as well as periodontal and systemic diseases that may influence orthodontic treatment.
• Adult patients with age ranging from 18 to 25 years.
• Full permanent dentition with exclusion of third molars.
• Both first and second maxillary molars are in occlusion.
• Skeletal class I, mild or moderate skeletal class II malocclusion.
• Full cusp or end to end class II molar relationship.
• Mild to moderate crowding in the upper dental arch and / or increased overjet.
• Normal or horizontal growth pattern.
• Non-extraction treatment plan.

Exclusion criteria

• Previous orthodontic treatment.
• Treatment planning requiring orthognathic surgery.
• Severe molar rotation.
• Poor oral hygiene.