<abstract xmlns="http://www.w3.org/1999/xhtml">

<bold>Objective</bold>: To compare and evaluate the cephalometric hard and soft tissue changes of mandible after orthodontic treatment with and without extraction of four first premolar.
<bold>Methodology:</bold> 60 individuals with Class I skeletal pattern were selected as per inclusion criteria. They were divided into two groups: 30 in the extraction group and 30 in the non-extraction group. Each group consists of 15 males and 15 females. Pre-treatment and post-treatment lateral cephalograms of the selected subjects were obtained, analysed and compared to assess the changes might have occurred. Descriptive statistics of the explanatory and outcome variables were calculated by mean and standard deviation for quantitative variables. Paired t test was applied to check the statistical difference of pre-treatment and post-treatment cephalometric parameters within the group (Extraction and non-extraction). Unpaired t test was used to check the statistical difference between extraction and non-extraction groups. The level of significance is set at 5%.
<bold>Results</bold>: B point moved backward with lower incisor retraction. N-A-Pog shows a statistically significant decrease in the extraction group (P=0.003). B-NP shows a statistically significant decrease in extraction group (P=0.001). N- A’-Pog’ shows a statistically significant increase in non-extraction group (P=0.046). Soft tissue thickness in chin increases in extraction group and decreases in non-extraction group.
<bold>Conclusion</bold>: The results indicate that premolar extraction will have a flattening effect on the midface. With proper diagnosis and treatment planning, premolar extractions have high potential to improve the facial profile.
</abstract>

Objective: To compare and evaluate the cephalometric hard and soft tissue changes of mandible after orthodontic treatment with and without extraction of four first premolar.
Methodology: 60 individuals with Class I skeletal pattern were selected as per inclusion criteria. They were divided into two groups: 30 in the extraction group and 30 in the non-extraction group. Each group consists of 15 males and 15 females. Pre-treatment and post-treatment lateral cephalograms of the selected subjects were obtained, analysed and compared to assess the changes might have occurred. Descriptive statistics of the explanatory and outcome variables were calculated by mean and standard deviation for quantitative variables. Paired t test was applied to check the statistical difference of pre-treatment and post-treatment cephalometric parameters within the group (Extraction and non-extraction). Unpaired t test was used to check the statistical difference between extraction and non-extraction groups. The level of significance is set at 5%.
Results: B point moved backward with lower incisor retraction. N-A-Pog shows a statistically significant decrease in the extraction group (P=0.003). B-NP shows a statistically significant decrease in extraction group (P=0.001). N- A’-Pog’ shows a statistically significant increase in non-extraction group (P=0.046). Soft tissue thickness in chin increases in extraction group and decreases in non-extraction group.
Conclusion: The results indicate that premolar extraction will have a flattening effect on the midface. With proper diagnosis and treatment planning, premolar extractions have high potential to improve the facial profile.

Comparative analysis of mandibular changes after orthodontic treatment with and without extraction of four premolars: A digital cephalometric study

Department of Orthodontics and Dentofacial Orthopedics

Acta Marisiensis - Seria Medica

This work is licensed under the Creative Commons Attribution 4.0 International License.

Objective: To compare and evaluate the cephalometric hard and soft tissue changes of mandible after orthodontic treatment with and without extraction of four...

Comparative analysis of mandibular changes after orthodontic treatment with and without extraction of four premolars: A digital cephalometric study

Published Online: Jul 11, 2022

Page range: 61 - 67

Received: Apr 07, 2022

Accepted: Jun 02, 2022

DOI: https://doi.org/10.2478/amma-2022-0012

Keywords
corrective orthodontics, premolar, chin, tooth extraction, mandible

© 2022 Anithab Alex et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Comparative analysis of mandibular changes after orthodontic treatment with and without extraction of four premolars: A digital cephalometric study

Published Online: Jul 11, 2022

Page range: 61 - 67

Received: Apr 07, 2022

Accepted: Jun 02, 2022

DOI: https://doi.org/10.2478/amma-2022-0012

Keywordscorrective orthodontics, premolar, chin, tooth extraction, mandible

© 2022 Anithab Alex et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Keywords
corrective orthodontics, premolar, chin, tooth extraction, mandible