Vertical Gingival Display Changes Associated With Upper Premolars Extraction

Not Applicable

Completed

• Conditions: Gummy Smile; Orthodontic Treatment
• Interventions: Procedure: Upper second premolars extraction; Procedure: Upper first premolars extractions

• Registration Number: NCT04375540
• Lead Sponsor: Jordan University of Science and Technology

Brief Summary

To investigate and compare vertical gingival display (VGD) changes associated with upper premolars extraction during orthodontic treatment.

Detailed Description

Seventy-six subjects who met the inclusion criteria were divided into one of 3 groups according to their treatment modalities as follows: group 1: upper first premolars extraction (24 patients, aged 21.56±3.19 years); group 2: upper second premolars extraction (26 patients, aged 22.16±3.59 years) and group 3: no orthodontic intervention was performed (happy with their teeth) (26 subjects, aged 20.45±3.29 years).

Initial records (radiographs, study casts and clinical photographs) were taken for all subjects. The same records were taken post treatment for treated subjects only. The Pre- and post- treatment VGD and lip length in static and dynamic positions and the amount of upper teeth retractions were recorded.

The paired t-test and ANOVA test were used to detect treatment changes and differences between studied groups, respectively. Factors affecting VGD were investigated using backward stepwise linear regression analysis.

Study Timeline

• Study Start: 2016-09-01
• Primary Completion: 2018-12-01
• Study Completion: 2018-12-01
• Status Verified: 2020-05
• Study First Submitted: 2020-05-02
• Study First Submitted QC: 2020-05-02
• Study First Posted: 2020-05-05
• Last Update Submitted: 2020-05-05
• Last Update Posted: 2020-05-07

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 76

Inclusion Criteria

• age 17 years or more
• skeletal class I or class II malocclusion
• upper premolars extraction treatment plan
• high smile line 2mm or more
• no previous orthodontic treatment.

Exclusion Criteria

• poor oral hygiene
• lower arch extraction treatment plan
• smoking
• Any systemic or periodiontal disease.

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Upper second premolars extraction	Upper second premolars extraction	Included 26 patients (8 males,18 females) with a mean age of 22.16±3.59years who were treated with fixed orthodontic appliance for 2.25±0.30 years.
Upper first premolars extraction	Upper first premolars extractions	Included 24 patients (7 males,17 females) with a mean age of 21.56±3.19years who were treated with fixed orthodontic appliance for 2.22±0.31years.

Primary Outcome Measures

Name	Time	Method
The amount of pre- and post-treatment vertical gingival display in static and dynamic positions.	2 years	Measured from the lower edge of the upper lip to the gingival margins of the incisors in mm.
Pre- and post treatment Nose-U-lip-length	2 years	Measured from the soft tissue subnasale to the upper lip stomion (base of the nose to the lip edge of the upper lip) in mm.
Upper anterior teeth retraction	2 years	The amount of upper anterior teeth edges' retraction on cephalometric superimposition in mm
Upper incisors extrusion	2 years	The amount of upper incisors edges vertical displacement on cephalometric superimposition in mm

Secondary Outcome Measures

Name	Time	Method
Upper molars protraction	2 years	The amount of upper molars protraction measured from the mesial contact point of the molar in the baseline model to the mesial contact point of the transposed transparent model(S1) in mm

Trial Locations

Locations (1)

Faculty of Dentistry/ Jordan university of Science and Technology Dental Teaching cliniucs; 🇯🇴 Irbid, Jordan