Authors : Abhijeet Kadua, Balakrishnan Jayanb, NandKishor Sahooc, Amrit Thapad, Uday kamate, P K Chattopadhyayf
DOI : 10.18231/j.jco.2017.011
Volume : 1
Issue : 3
Year : 2017
Page No : 1-7
Background : Mandibular corpus distraction osteogenesis( DO) is emerging as the standard of care in the management of mandibular deficiencies exceeding 8 mm. Mandibular retrognathia has been regarded as a risk factor for airway deficiency and sleep disordered breathing. In view of the above this retrospective cephalometric study was conducted with the aim to evaluate upper airway dimensional changes and hyoid position variations in adult patients with mandibular deficiency treated by mandibular DOand to establish the ratio of mandibular advancement to increase in airway dimensions.
Materials and Method: Pre and post treatment lateral cephalograms of 12 adults (7 females and 5 males) with severe mandibular deficiency treated by combined orthodontics and mandibular DO were evaluated for changes in posterior airway space (PAS), Superior airway space (SAS), minimum airway space (MAS), hyoid bone position (MP-H), effective mandibular length (Co-Gn), mandibular corpus length (Go-Pg) and pogonion
position (N perpendicular- Pg). The cephalograms were manually traced by a single operator and the data was analyzed using MINITAB 13.2 version software.
Results: There was statistically highly significant (p d” 0.0001) increase in PAS, SAS, MP-H, Co-Gn and Go- Pg. The mean ratio of mandibular advancement to increase PAS, SAS, and MAS was 1:0.49, 1:0.37 and 1:0.45 respectively. Hyoid bone moved superiorly and anterior direction by 3.6+1.8 mm and was found to be statistically highly significant (p d” 0.0001).
Conclusion: The study showed an overall improvement in airway dimensions and in hyoid position after mandibular lengthening suggesting that the procedure is a viable treatment option in correction of upper airway deficiencies and sleep disordered breathing.