Authors :
Dr. Sharmila.R. , Dr. B. Balashanmugam, Dr.Shalini G Jain , Dr. A. Nandhini
Volume/Issue :
Volume 7 - 2022, Issue 5 - May
Google Scholar :
https://bit.ly/3IIfn9N
Abstract :
The anatomy of cervical spine plays a
pivotal role in maintaining the head posture and
craniofacial morphology. It was also essential for the
normal functioning of the stomatognathic system.
Studies show an association between subjects with Class
II Skeletal malocclusion due to retrognathic mandible,
and altered craniofacial morphology. These subjects are
prone to develop compensatory cervical hypolordosis.
The aim of this study was to evaluate the changes in
cervical lordosis before and after treatment of Class II
skeletal patients with retrognathic mandible by Twin
block therapy.
MATERIALS & METHODS: Sixteen subjects (8 Males
&8 females) aged between 10-13 years with skeletal Class
II malocclusion with retrognathic mandible were chosen
for the study. They were given standard twin block
appliance and evaluated for changes in cervical
curvature after the Twin blockphase. Pre and post
treatment craniofacial skeletal changes and cervical
curvature change were assessed using lateral
cephalograms. Paired t test was used to evaluate the
cephalometric changes between T0 and T1.
RESULTS: There was no statistically significant
difference in the age and treatment duration among the
subjects. In the lateral cephalogram, between T0 and T1,
there was a significant difference in the SNB, ANB, ARGO, AR-GN, LI-GO-GN and the craniocervical angles
SN/CVT and MP/CVT. However there was no
statistically significant difference in SNA, MP and the
craniocervical angles SN/OPT and MP/OPT and the
cervical lordosis angles OPT/CVT and CVT/EVT.
CONCLUSION: The null hypothesis was rejected
because there was a difference in the cervical curvature
before and after mandibular advancement by Twin
block therapy. There was improvement in the sagittal
relationship between maxilla and mandible after Twin
block therapy. There was a significant change in the
middle segment of the cervical column, which could
indicate a change in the cervical curvature to a normal
lordotic curve.
Keywords :
Twin block, cervical column, Lordotic curve
The anatomy of cervical spine plays a
pivotal role in maintaining the head posture and
craniofacial morphology. It was also essential for the
normal functioning of the stomatognathic system.
Studies show an association between subjects with Class
II Skeletal malocclusion due to retrognathic mandible,
and altered craniofacial morphology. These subjects are
prone to develop compensatory cervical hypolordosis.
The aim of this study was to evaluate the changes in
cervical lordosis before and after treatment of Class II
skeletal patients with retrognathic mandible by Twin
block therapy.
MATERIALS & METHODS: Sixteen subjects (8 Males
&8 females) aged between 10-13 years with skeletal Class
II malocclusion with retrognathic mandible were chosen
for the study. They were given standard twin block
appliance and evaluated for changes in cervical
curvature after the Twin blockphase. Pre and post
treatment craniofacial skeletal changes and cervical
curvature change were assessed using lateral
cephalograms. Paired t test was used to evaluate the
cephalometric changes between T0 and T1.
RESULTS: There was no statistically significant
difference in the age and treatment duration among the
subjects. In the lateral cephalogram, between T0 and T1,
there was a significant difference in the SNB, ANB, ARGO, AR-GN, LI-GO-GN and the craniocervical angles
SN/CVT and MP/CVT. However there was no
statistically significant difference in SNA, MP and the
craniocervical angles SN/OPT and MP/OPT and the
cervical lordosis angles OPT/CVT and CVT/EVT.
CONCLUSION: The null hypothesis was rejected
because there was a difference in the cervical curvature
before and after mandibular advancement by Twin
block therapy. There was improvement in the sagittal
relationship between maxilla and mandible after Twin
block therapy. There was a significant change in the
middle segment of the cervical column, which could
indicate a change in the cervical curvature to a normal
lordotic curve.
Keywords :
Twin block, cervical column, Lordotic curve
