Effect of premolar extractions on facial vertical dimension- A cephalometric study

Objectives Due to the constant battle regarding the controversial topic of orthodontic extraction, this study aims to assess the changes in vertical dimensions of patients treated with premolar extractions compared with nonextraction orthodontic patients. Materials and Methods A sample of 60 borderline patients were recruited and divided into extraction and nonextraction groups. Eleven pretreatment cephalometric measurements were recorded using WebCeph and patients were followed-up until the completion of treatment. Statistical Analysis Intragroup and intergroup comparisons were made using paired t-test and two-sample independent t-test, respectively. The joint significance of differences was measured using F-tests. Results The intragroup comparison revealed that in the extraction group, the vertical dimension was significantly increased posttreatment for four cephalometric measurements, that is, mandibular plane angle (p < 0.05), palatal plane angle (p < 0.05), Frankfort mandibular plane angle (p < 0.05), and y-axis (p < 0.05). In the comparison of the posttreatment values of both groups, the mean differences of the posttreatment values for sella nasion (SN)-gonion (Go)-gnathion (Gn) angle (p = 0.008), the total anterior (p = 0.050), and lower anterior facial heights (AFH; p = 0.011) were significantly higher. At the same time, the Jarabak ratio was significantly (p = 0.006) lower in the extraction group than in the nonextraction group. Conclusion The increase in vertical dimension is significantly higher in the extraction group than in the nonextraction group which indicates a significant impact of orthodontic extraction on the vertical dimensions.

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Vertical Skeletal Changes after Extraction and Nonextraction Orthodontic Treatment

Shafique

Zaheer

Jan

et al. 2022

Eur J Dent

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Assessment and comparison of palatal rugae pattern in clinically obvious ND non obvious asymmetrical patients

Maurya¹,

Chauhan

Khanna³

et al. 2022

IJODR

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Various types of appliances have been tried by the Orthodontists for the fixed orthodontic treatment. Irrespective of the appliance used the main goal of retraction of anterior teeth in extraction cases is to keep the vertical dimension stable so as not to allow downward and backward rotation of mandible. The aim of this study was to compare changes in mandibular rotation following fixed orthodontic treatment on subjects who have undergone extraction of all first premolars.Pre and post treatment lateral Cephalogram of 25 subjects were taken (13 females and 12males), aged 18-25 years and the tracings were done using Nemoceph software. Parameters assessed were facial height (anterior and posterior), mandibular plane angle (FMA & SN-GoGn), and Jarabak ratio. Student t-test was used to make statistical comparison.Mean difference of SN-GoGn (0.15 ±0.07), FMA (0.23 ±0.52), Anterior facial height (0.18±0.01) and posterior height (0.45±0.01) and Jarabak ratio (0.47±0.32) did not show statistically significant difference between pre and post treat ment.Mandibular plane did not alter during treatment. When adequate mechanics is followed during treatment desirable treatment outcome with insignificant alteration of mandibular plane can be achieved.

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Effect of premolar extraction on mandibular rotation

Chandra

Khanna²,

Verma³

et al. 2022

IJODR

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Various types of appliances have been tried by the Orthodontists for the fixed orthodontic treatment. Irrespective of the appliance used the main goal of retraction of anterior teeth in extraction cases is to keep the vertical dimension stable so as not to allow downward and backward rotation of mandible. The aim of this study was to compare changes in mandibular rotation following fixed orthodontic treatment on subjects who have undergone extraction of all first premolars. Pre and post treatment lateral cephalogram of 25 subjects were taken (13 females and 12 males), aged 18-25 years and the tracings were done using Nemoceph software. Parameters assessed were facial height (anterior and posterior), mandibular plane angle (FMA & SN-GoGn), and Jaraback ratio. Student t-test was used to make statistical comparison. Mean difference of SN-GoGn(0.15 ±0.07), FMA(0.23 ±0.52), Anterior facial height(0.18±0.01) and posterior height(0.45±0.01) and Jaraback ratio(0.47±0.32) did not show statistically significant difference between pre and post treatment. Mandibular plane did not alter during treatment. When adequate mechanics is followed during treatment desirable treatment outcome with insignificant alteration of mandibular plane can be achieved.

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Effect of premolar extractions on facial vertical dimension- A cephalometric study

Cited by 4 publications

References 5 publications

Vertical Skeletal Changes after Extraction and Nonextraction Orthodontic Treatment

Vertical Skeletal Changes after Extraction and Nonextraction Orthodontic Treatment

Assessment and comparison of palatal rugae pattern in clinically obvious ND non obvious asymmetrical patients

Effect of premolar extraction on mandibular rotation

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