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ORIGINAL ARTICLE
Year : 2017  |  Volume : 51  |  Issue : 4  |  Page : 239-244

Effect of first premolar extraction on point A, point B, and pharyngeal airway dimension in patients with bimaxillary protrusion


1 Prof., Department of Orthodontics, SMBT Dental College and Hospital, Ahmednagar, Maharashtra, India
2 Former PG Student, Department of Orthodontics, SMBT Dental College and Hospital, Ahmednagar, Maharashtra, India
3 Second Year PG Student, Department of Orthodontics, SMBT Dental College and Hospital, Ahmednagar, Maharashtra, India

Correspondence Address:
Manali Jadhav
Department of Orthodontics, SMBT Dental College and Hospital, Amrutnagar, Ghulewadi, Sangamner, Ahmednagar - 422 608, Maharashtra
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/jios.jios_42_17

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Objective: The aim was to determine the effect of first premolar extraction on point A, point B and pharyngeal airway dimension in patients with bimaxillary protrusion. Materials and Methods: The following study included pre- and post-orthodontic treatment cephalograms of thirty bimaxillary protrusion patients. First premolars were extracted and all the cases were treated with maximum anchorage. Cephalometric radiographs were used to measure the changes in point A, point B, and pharyngeal airway dimensions. Pre- and post-treatment variables comparison was done using paired t-test and study of relationship between soft- and hard-tissue variables was carried out using linear regression equation. Results: In the results, there was a statistically significant increase in upper airway space (P < 0.05) and reduction in upper adenoid thickness (P < 0.05), tongue length (P < 0.05), and inferior airway space (P < 0.05). Retraction of mean point A and soft tissue point A (sA) was 3.3 mm (P < 0.001) and 2.1 mm (P < 0.001) and mean point B and soft tissue point B (sB) was 3.8 mm (P < 0.001) and 2.6 mm (P < 0.001), respectively. Between retraction of point A and soft tissue point A (r = 0.9594, t = 101.84, P< 0.01) and point B and soft tissue point B (r = 0.9102, t = 83.246, P< 0.01) a significant degree of correlation was seen to exist, along with lips retraction, retraction of the skeletal and soft tissue points A and B contributed to the decrease in hard and soft-tissue convexity. Conclusions: Upper airway space was increased which may be caused by lymphoid mass regression. Inferior airway space was reduced with the extraction of the first premolars for the treatment of bimaxillary protrusion. Retraction of Sa and Sb was brought about by retraction of skeletal point A and point B. Skeletal points and overlying corresponding soft tissue points showed nearly proportionate changes.


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