To investigate and compare vertical gingival display (VGD) changes associated with upper premolars extraction during orthodontic treatment.
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 Type
INTERVENTIONAL
Allocation
NON_RANDOMIZED
Purpose
TREATMENT
Masking
SINGLE
Enrollment
76
Fixed orthodontic treatment with upper first premolars extraction and space closure using 0.019X0.025 SS AW and elastic chain.
Fixed orthodontic treatment with upper second premolars extraction and space closure using 0.019X0.025 SS AW and elastic chain.
Faculty of Dentistry/ Jordan university of Science and Technology Dental Teaching cliniucs
Irbid, Jordan
The amount of pre- and post-treatment vertical gingival display in static and dynamic positions.
Measured from the lower edge of the upper lip to the gingival margins of the incisors in mm.
Time frame: 2 years
Pre- and post treatment Nose-U-lip-length
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.
Time frame: 2 years
Upper anterior teeth retraction
The amount of upper anterior teeth edges' retraction on cephalometric superimposition in mm
Time frame: 2 years
Upper incisors extrusion
The amount of upper incisors edges vertical displacement on cephalometric superimposition in mm
Time frame: 2 years
Upper molars protraction
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
Time frame: 2 years
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