(n.) The middle of the anterior margin of the great foramen of the skull.
Example Sentences:
(1) When the junction was located higher than the line between the lowest point of the occipital bone and the basion by 1 cm or more, the approach was made through the middle of the sigmoid sinus which was exposed by suboccipital osteoclastic craniectomy (mid-lateral cerebellar approach).
(2) Longitudinal measures of cranial base angulation (nasion-sella-basion angle; N-S-Ba) were obtained in 24 patients with mandibulofacial dysostosis (MFD), with records available over time spans ranging from 2 years to 29 years.
(3) There was a significant difference in the position of the odontoid tip and the nasion-basion-opisthion angle between the normal and patient groups.
(4) The Wholey dens-basion line and direct measurement of the atlantooccipital joint width were each correct in 50% of cases, the Powers ratio in 33% of cases, and the Dublin method in only 25% of cases.
(5) For growth analysis the basion-nasion plane was shown to be longitudinally of superior value for chin behavior.
(6) Changes in the AP group are largely due to anteroinferior displacement of the basion-sella plane.
(7) Tracings of pretreatment (average age for boys, 12.5 years; for girls, 12.2 years) and posttreatment (average age for boys, 15.4 years; for girls, 14.9 years) cephalograms were superimposed according to the following methods: (1) best fit of anterior cranial base anatomy, (2) superimposition on SN line, registered at S, (3) superimposition on registration point R with Bolton-nasion planes parallel, and (4) superimposition on basion-nasion (Ricketts), registered at point CC (4) and point N (4a).
(8) The tumor, extending about one centimeter superiorly to the basion and inferiorly to the upper border of C2 body, was removed completely, and then the dural defect was covered with a piece of fascia and gelform.
(9) Unlike the deformation experienced by the external vault plates, the basion-sella plane orientation remains stable with respect to the Frankfort Horizontal.
(10) MR was less effective than tomography in evaluating the basion-dental interval, erosion of the posterior spinous processes, apophyseal joint disease from C3 inferiorly, and cystic changes of the articular facets of C1-C2.
(11) The cranial base flattened as a result of the upward and forward migration of nasion and the upward and backward relocation of basion.
(12) The distance between the anterior arch of the atlas and odontoid process as well as the displacement of the basion in relation to the first cervical vertebrae were examined.
(13) When the measurements were statistically analysed, we have found a positive correlation between the basion prosthion length and the maximum cranial length, maximum cranial breadth and the bizygomatic breadth, nasion prosthion length and basion bregmatic height, and the palatal breadth and palatal length.
(14) The relationship between these two major reference lines (RBL and CML) and the other four reference lines including nasion-clition line (NC), clition-basion line (CB), nasion-basion line (NB) and nasion-opisthion line (NO) is also evaluated.
(15) Measurements taken from lateral radiographs demonstrated that alternative forms of the cranial base angle (N-S-Ba, planum angle, planum sphenoidale to plane of the clivus and PANG angle, planum sphenoidale to basion-sella plane) and the orbital and OANG angles (orbital roof to plane of the clivus and basion-sella plane, respectively) of both deformed groups increased while the angle S-Ba-O decreased significantly with respect to the undeformed (N) sample.
(16) The form was represented by five landmarks: the nasion (N), basion (Ba), sella (S), frontomaxillonasal suture (FMN), and sphenoethmoidal registration point (SE), and the deformities were computed as mean deformations from age- and sex-matched normal mean forms.
(17) Measured are also the distances between dens axis and anterior arch of atlas and basion.
(18) The angle of inclination of the Foramen magnum to the Frankfort plane was determined from the altitude of the Basion and Opisthion and from the length of the Foramen magnum.
(19) This finding was reflected in a decrease in the angle between the sphenoidal and clival planes and that of the nasion-sella-basion.
(20) An assessment of method error due to point location by the cursor was made by duplicate determination, and an assessment of symmetry was carried out by comparing angular values derived from basion (ba) for right and left sides of the maxillary dental arch, zygomatic arch and cranial base.
Nasion
Definition:
(n.) The middle point of the nasofrontal suture.
Example Sentences:
(1) The sagittal distribution of N18 was studied in a patient with a thalamic lesion and an oblique distribution with the maximum region between Cz and nasion was demonstrated.
(2) The accuracy of vertical control during maxillary orthognathic surgery was assessed in 45 patients, comparing the use of traditional internal measurements across the osteotomy lines (15 subjects) with measurements between the incisor teeth and an external reference point consisting of a bone screw placed at nasion (two groups of 15 subjects each).
(3) The angles they form at nasion and at their intersections with the maxillary occlusal plane were derived and statistically analyzed.
(4) The angle AB to occlusal plane however seems to be independent of the relation between the A-point and the Nasion.
(5) Senior Thai government officials signed the deal on Thursday with members of the Barisan Revolusi Nasional (BRN) in the Malaysian capital, Kuala Lumpur, where they agreed to launch a "dialogue process" in the southern border provinces.
(6) The deviation can be measured by means of the Sella-Nasion-A angles used in the evaluation of the x-ray image.
(7) The sella-nasion plane is one of the basic planes used in the cephalometric evaluation of candidates for orthognathic surgery.
(8) Longitudinal measures of cranial base angulation (nasion-sella-basion angle; N-S-Ba) were obtained in 24 patients with mandibulofacial dysostosis (MFD), with records available over time spans ranging from 2 years to 29 years.
(9) Generally, the inclination of the nose in relation to the nasion-sella-line was similar in all groups, and so was the nose length as well.
(10) The growth rate of the human cranial base between nasion (N) - tuberculum sellae (Ts) and tuberculum sellae - internal occipital protuberance (= Twining's line (Tw)) were calculated in proportion to nasion - inion (N - I) distance and expressed in two cranial base ratios: (see formulas) The growth rate of the whole cranial base showed a notable stability and a given ratio apparently prevails through into later life.
(11) There was a significant difference in the position of the odontoid tip and the nasion-basion-opisthion angle between the normal and patient groups.
(12) These radiographs were analysed using a facial polygon joining the points Nasion, Sella, Articulare, Gonion and Menton.
(13) 7) As a result of cephalometric diagnosis, the nasion appeared to be protruded, therefore maxillary and mandibular seemed to be relatively retracted, and the gonial angle was obtuse.
(14) For growth analysis the basion-nasion plane was shown to be longitudinally of superior value for chin behavior.
(15) Ethnic proportional differences relative to nasion were combined with a shorter porion-nasion distance in the Chinese as compared with the Caucasian children.
(16) In order to avoid misinterpretations in the evaluation of orthodontic treatment results the growth changes at nasion must be taken into consideration.
(17) To depict skeletal and dental changes, measurements were made using the sella nasion, palatal, and mandibular planes as reference planes.
(18) Thus Francfort and nasion-opisthion axes both look equally good.
(19) Tracings of pretreatment (average age for boys, 12.5 years; for girls, 12.2 years) and posttreatment (average age for boys, 15.4 years; for girls, 14.9 years) cephalograms were superimposed according to the following methods: (1) best fit of anterior cranial base anatomy, (2) superimposition on SN line, registered at S, (3) superimposition on registration point R with Bolton-nasion planes parallel, and (4) superimposition on basion-nasion (Ricketts), registered at point CC (4) and point N (4a).
(20) Currently Malaysia's sovereign wealth fund, Khazanah Nasional, is the 69% majority owner, and plans to buy out other shareholders at a premium.