Master’s Degree Awarded to Mr. Mohammed Ahmed Qasem in Oral and Maxillofacial Surgery
Mr. Mohammed Ahmed Qasem Ahmed was awarded a Master’s Degree in Oral and Maxillofacial Surgery with an average of (Excellent) for his thesis titled: Primary Stability of Short Dental Implants with Deep Threads in the Posterior Maxilla During the Early Healing Phase, which was submitted to the Department of Oral and Maxillofacial Surgery, Faculty of Dentistry – Sana’a University. The MA defense was held on Thursday, October 9, 2025.
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. Yahya Abdullah Ahmed Al-Hadi | Internal Examiner | Chair |
| 2 | Dr. Yasser Ahmed Salem Al-Rubaidi | Main Supervisor | Member |
| 3 | Assoc. Prof. Nashwan Hamed Saleh Al-Tayri | External Examiner | Member |
The study aimed to evaluate the primary stability of short dental implants with deep threads in the posterior maxilla during the early healing period, with a particular focus on the relationship between Insertion Torque (IT) and the Implant Stability Quotient (ISQ).
The Key Findings of the Study were as follows:
- Successful Primary Stability:
The results demonstrated that high initial stability can be achieved when using short implants with deep threads in the posterior maxilla, making them a reliable option in low-density bone (D3–D4). - Optimal Insertion Torque:
The highest values of primary stability (ISQ) were recorded when using a moderate insertion torque ranging between 26–30 N·cm, highlighting the importance of avoiding excessive torque during implant placement. - High Torque is Undesirable:
It was observed that high insertion torque (36–45 N·cm) led to a gradual decrease in ISQ values during the early healing phase, indicating a possible micro-damage or stress to the surrounding bone. - Efficiency of Deep Thread Design:
Short implants with deep thread designs proved effective in enhancing primary stability even in low-density bone, making them a successful alternative to longer implants in such regions. - Weak Correlation between IT and ISQ:
No strong correlation was found between insertion torque (IT) and implant stability quotient (ISQ) during the first four weeks of healing, suggesting that each parameter reflects different aspects of implant stability.
The research recommended the following:
- Long-term follow-up after loading: Continuous monitoring of implants after loading is essential to assess their long-term stability and success.
- Further studies on IT and stability: Additional research is needed to better understand the correlation between insertion torque and implant stability across different bone types.
- Caution against high torque: Clinicians should avoid excessively high insertion torque, as it may damage bone tissue and increase the risk of early implant failure.
- Use of ISQ in healing assessment: Regular ISQ measurements during the healing process can help detect early complications and support sound clinical decision-making regarding the optimal loading time.
The defense session was attended by a number of academics, researchers, colleagues and the researcher’s family members.
