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Biomedical subjects

O A Sarhan

Publications and source records attributed to O A Sarhan.

14 recordsLinked to original sources
PubMed1997

Vertical and horizontal linear growth of the maxillary and mandibular lips: a longitudinal study.

This study was designed to quantify linear changes in length and thickness for both maxillary and mandibular lips. Twenty-seven (27) untreated children were used in this study. Five serial lateral radiographs were taken from the age of 3-18 years old. Results of the study demonstrated that lips grow in length and thickness by age. Also, this growth in both dimensions is more marked in male subjects than in females.

Adolescent↗
PubMed1995

The anterior facial triangle: a method of cephalometric appraisal.

The purpose of this study was to introduce a simple cephalometric method to identify individually the possible rotations of the palatal and mandibular planes, using point nasion as a reference, without the need to include the Sella Nasion or Frankfort horizontal planes. Also, using this method, it was possible to detect the antero-posterior position of subspinale. A random sample of 150 British school children aged 9-12 years was used. Lateral skull radiographs were taken. The lateral films were traced and digitzed. A mean shape outline +/- 1 s.d. for the sample was produced and superimposed on the craniofacial centroid for all the digitized tracings. A facial triangle was established, joining nasion to posterior nasal spine and nasion to the anteroposterior position of the subspinale intersecting the line joining the posterior nasal spine and anterior nasal spine.

Cephalometry↗
PubMed1995

Sella-Nasion line revisited.

The anterior cranial base or the Sella-Nasion (SN) line is often used by orthodontists as a reference line for assessment of dentofacial deformities. Its most important value is its relative stability, practicality and the ease of location of both points Sella and Nasion. Reliability of the SN line as a suitable assessor for exact facial measurements has been discussed before. The intent of this study was to identify unusual SN rotations for subjects acquiring normal and abnormal skeletal profiles and hence correct values associated with SN line, both in vertical and horizontal planes. A random sample of 150 British white school children aged 9-12 years old was selected. Lateral head films of the children were traced and digitized. Point Nasion was joined to posterior nasal spine and also to point Sella, thus producing a Z angle when the posterior nasal spine is extended to anterior nasal spine. Means and standard deviations were calculated. The mean angle S-N-PNS was 38 degrees +/- 5 while the mean of angle N-PNS-ANS was 47 degrees +/- 3. Comparison of these angles for patients of the same age group with the mean Z angle can identify rotation of the palatal and Sella-Nasion planes. Hence corrections of angular measurements involving Sella point can be performed.

Cephalometry↗
PubMed1994

Dento-skeletal components of class II malocclusions for children with normal and retruded mandibles.

A random sample of 150 British school children aged 9 to 12 years was selected. Lateral skull radiographs were taken and traced. None of the subjects had any orthodontic treatment before. Out of the sample of 150 children, 41 children (18 boys and 23 girls) were selected on the basis of ANB angle > or = 4.5 degrees, as having class II skeletal relationship. Average age of the children was 10 years, 16 angular and 8 linear, skeletal and dental parameters were used. The 41 class II skeletal sample was divided according to the value of SNB angle into subjects with normal anteroposterior positioned mandibles (SNB > or = 76 degrees--19 children) and retruded mandibles (SNB < or = 75.5 degrees--22 children). Descriptive statistics for the skeletal class II sample was done, which confirmed earlier studies. In addition, descriptive statistic was done for each SNB group in order to characterize them. Student t test was done to identify significant differences between both groups of skeletal class II. The results revealed significant difference for SNA (P < 0.001); SN-Pog (P < 0.001); NS Gn (P < 0.001); SN-MP (P 0.001); ANS-PNS-Go-Me (P, 0.01); SN-occl (P < 0.001); 1-MP (P < 0.01); N-Me (P < 0.001); N-ANS (P < 0.05).

Cephalometry↗
PubMed1993

Geometrical interpretation for abnormal facial behaviour with possible correction of angle S-N-A and S-N-B.

The orientation of the sella nasion (SN) line in lateral skull radiographs is important for accurate assessment of antero-posterior and vertical facial relationship. Lateral skull radiographs of a random sample were traced and digitized to produce a mean shape template of the sample, with the craniofacial centroid line (CFC) used as a base for superimposition of the sample. A geometrical triangle was formed using the sella nasion line, craniofacial centroid line and the mandibular plane as the sides of the triangle. Simple geometric calculations were done to re-orient both the mandibular plane and sella nasion line in cases with balanced clinical profiles, while the S-N-A and S-N-B measurements indicate otherwise.

Cephalometry↗
PubMed1993

Dento-skeletal components of class III malocclusions for children with normal and protruded mandibles.

A random sample of 150 British school children was selected age range 9 to 12 years. Lateral skull radiographs were taken and traced. None of the subjects had any orthodontic treatment before. 27 children average age of 10 years were selected on the basis of ANB < or = 1 degree as having class III skeletal relation (15 boys and 12 girls). 16 angular and 8 linear skeletal and dental parameters were used. The sample of class III skeletal relation was divided according to the value of SNB angle into subjects with normal anteroposterior situated mandibles; (SNB < or = 79 degree 14 children) and others with protruded mandibles; (SNB > or = 79.5 13 children). Descriptive statistics for the class III skeletal sample was done and compared to the mean sample. Student t test was performed to identify significant differences between both groups of class III skeletal relation. Significant differences between both groups were found for SNA, P < 0.001; SNPog, P < 0.001; SN MP, P < 0.001; SN-occl, P < 0.001 and 1-APog, P < 0.05.

Cephalometry↗
PubMed1990

A new cephalometric parameter to aid in dental base relationship analysis.

The cephalometric literature is rich with different craniofacial analyses. However, since these analyses are only descriptive for the clear skeletal discrepancies and somewhat handicapped for borderline cases, an investigation was designed to assess the dental base relationship in the human lateral skull cephalostat radiograph. A number of existing measurements were reviewed, and a new measurement, based upon anatomical points which could prove to be more reliable, was introduced.

Adult↗
PubMed1988

A comparative study between two randomly selected samples from which to derive standards for craniofacial measurements.

The present study was performed to derive cephalometric standards for Saudi Arabian boys aged from 9-12 years. The sample was then compared with a British sample aged 9-12 years to detect statistical differences. The differences between both samples demonstrated a slightly prognathic Saudi face, more protrusive upper and lower incisors, and low Gonial and saddle angles.

Cephalometry↗
PubMed1987

Adult cephalometric norms for Saudi Arabians with a comparison of values for Saudi and North American Caucasians.

When considering orthognathic surgery for adult Saudi Arabians, there are as yet no cephalometric norms available for use during treatment planning. Lateral cephalometric radiographs were taken for 48 Saudi adult patients (24 males, 24 females). All showed reasonably normal dental relationship, with no severe antero-posterior, vertical or transverse skeletal discrepancies. The age range was from 20 to 46 years. Angular and linear measurements were recorded and compared to a similar sample of North American caucasians. A set of cephalometric values for male and female Saudis were established and the differences between these and a North American sample are highlighted.

Adult↗