Master’s Degree Awarded to Ms. Khulood Rafiq Al-Ammari in Orthodontics

Ms. Khulood Rafiq Mohammed Ali Al-Ammari was awarded a Master’s Degree in Orthodontics for her thesis titled: Cephalometric Evaluation of Sagittal Lip Position in Different Skeletal Malocclusions, which was submitted to the Faculty of Dentistry ‎ – Sana’a University. The MA defense was held on Thursday, April 9, 2026 ‎.
The MA Viva-voce Committee, which was formed based on a resolution issued by the Graduate Studies and Scientific Research Council, consisted of the following:
# Committee Members Designation Position
1 Prof. Yasser Ali Thabet External Examiner Chair
2 Prof. Ghamdan Abdullah Al-Harari Main Supervisor Member
3 Asst. Prof. Naela Mohammed Al-Mujahid Internal Examiner Member

The thesis aimed to:
 Evaluate the sagittal position of the upper and lower lips relative to five cephalometric reference lines (H Line, E Line, B Line, S Line, and Sushner’s Line) using lateral radiographs.
 Compare lip position measurements across skeletal patterns (Class I, Class II, and Class III).
 Assess gender differences within each skeletal pattern.
 Determine the reliability of reference lines in distinguishing lip positions.
 Establish normative values for sagittal lip position among Yemeni adults.
 Analyze the relationship between sagittal lip position and the ANB angle.
The study yielded several key findings summarized as follows:
 There were statistically significant differences in sagittal lip position among Class I, Class II, and Class III patterns.
 Class II cases exhibited more protrusive lips, while Class III cases showed more retrusive lips.
 S Line, B Line, and E Line demonstrated the highest discriminatory ability between skeletal patterns, whereas H Line and Sushner’s Line showed lower effectiveness.
 A significant positive correlation was found between the ANB angle and lip position relative to S and B Lines, and a negative correlation with the E Line.
 No consistent statistically significant gender differences were observed within each skeletal pattern..‎
In light of these findings, the researcher recommended the following:‎
 Applying the derived normative values for Yemeni adults in orthodontic diagnosis and treatment planning.
 Using multiple reference lines for more accurate assessment of sagittal lip position.
 Considering ethnic variations rather than relying solely on global standards.
 Conducting future studies on different age groups and vertical skeletal patterns.
 Utilizing three-dimensional imaging techniques for comprehensive soft tissue evaluation.
 Incorporating aesthetic assessment questionnaires to link objective cephalometric measurements with subjective aesthetic perception relevant to the community.‎
The defense session was attended by a number of academics, researchers, students, colleagues, and the researcher’s family.