Vertical Gingival Display Changes Associated With Upper Premolars Extraction

Jordan University of Science and Technology

Status: Completed

Conditions: Orthodontic Treatment; Gummy Smile

Treatments: Procedure: Upper first premolars extractions; Procedure: Upper second premolars extraction

Study type: Interventional

Funder types: Other

Identifiers

NCT04375540

285/2016

Details and patient eligibility

About

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

Full 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.

Enrollment: 76 patients

Sex: All

Ages: 17 to 28 years old

Volunteers: Accepts Healthy Volunteers

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.

Trial design

Primary purpose: Treatment

Allocation: Non-Randomized

Interventional model: Parallel Assignment

Masking: Single Blind

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76 participants in 3 patient groups

Upper first premolars extraction

Experimental group

Description:

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.

Treatment:

Procedure: Upper first premolars extractions

Upper second premolars extraction

Experimental group

Description:

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.

Treatment:

Procedure: Upper second premolars extraction

No intervention

No Intervention group

Description:

Included 26 subjects (10 males, 16 females) with a mean age of 20.45±3.29years.This group was included to observe any changes in the vertical gingival display over the 2 years' observation period (1.65±0.17 years).