The present study was both methodological and investigative in
nature. This included the development of computerised rhinomanometry
and establishment of cephalometric measurement apparatus
together with a standardised lateral cephalometric radiography
technique to record natural head posture.
The method errors of both the measurement systems and the
operator were tested by duplicate determinations and subsequent
statistical analysis. Recordings for all the variables in the study
were reproducible without systematic error and with a very small
Apparatus was used to record nasal respiratory resistance
(NRR), craniofacial form and head posture in a control group for
comparison with subjects with cleft lip (CL), cleft palate (CP), and
unilateral cleft lip and palate (UCLP).
The results of the rhinomanometric recording indicated that the
bilateral nasal resistance did not differ significantly between the
cleft samples and the controls. Unilateral measurements of nasal
resistance showed higher values for the cleft side than for the
non-cleft side, both in cleft lip (CL) and the unilateral cleft lip
and palate (UCLP) samples. In the cleft palate (CP) sample as well as in the controls, unilateral nasal resistance did not differ
between the two sides.
Comparisons were made between cephalometric measurements for
craniofacial form and head posture for each category of the clefting
deformity and the controls and the statistically significant
Previous studies have demonstrated associations between
cranio-cervical angulation and craniofacial morphology, and between
airway adequacy and cranio-cervical angulation.
In the present study, differences and correlations were
calculated between face height, head posture and airway resistance
which were in agreement with the predicted pattern of associations
between cranio-cervical angulation and craniofacial morphology
(face height) and between airway adequacy and cranio-cervical