Ο Dr. Χατζηστεφάνου έχει διεξάγει σημαντικό επιστημονικό και ερευνητικό έργο με δεκάδες συμμετοχές σε διεθνή και τοπικά συνέδρια και ημερίδες. Είναι επίσης μέλος συνατκτικής ομάδας διεθνών επιστημονικών περιοδικό με αντικείμενο τη χειρουργική κεφαλής, τραχήλου, στόματος, προσώπου και γνάθων. 

1. The role of comptuter assisting surgery in reconstruction of complicated post-traumatic deformity cases. (2020)
2. Adequate resection margins in patients with PNI-positive oral squamous cell carcinoma. (2017)
3. Medication Related Osteonecrosis of the Jaws – MRONJ. Diagnostic criteria and management. (2017)
4. Overview of oral mucosal melanoma therapeutic Approach. (2016)
5. Diagnostic and prognostic significance of perineural invasion associated clinical features in oral squamous cell carcinoma. (2016)
6. Secondary reconstruction of an extensive ablative defect of the mandible with fibula free flap. (2016)
7. Tooth exposure in a patient with fibrous dysplacia. (2016)
8. The role of neck dissection and postoperative adjuvant radiotherapy in cN0 patients with PNI-positive squamous cell carcinoma of the oral cavity.” (2014)
9. Odontogenic sinusitis: Retrospective analysis of 26 cases. (2015)
10. Mouth flora in intensive care unit patients. (2015)
11. Sinusitis in children and adults. (2014)
12. The role of comptuter assisting surgery in reconstruction of complicated post-traumatic deformity cases. (2014)
13. Alveolar cleft reconstruction – When, how, why? (2014)
14.  Mucosa melanoma of the oral cavity : Current therapeutic approach. (2014)
15. Complex Orbital Floor Fractures : Clinical features and reconstructive interventions. (2014)
16. Tongue cancer : Predisposing and adverse prognostic factors. (2014)
17. Minor Salivary Gland Tumours: A retrospective series of 28 Adenoid Cystic Carcinoma cases. (2013)
18. The use of a modified cervicopectoral flap for functional and aesthetic reconstruction of upper third facial ablative defects. (2010)
19. Immediate Reconstruction of Mandibular Defects Following Resection of Benign Pathology. (2010)
20. Available Algorithms for Ablative Defect Reconstruction in the Head and Neck Region. (2010)
21. Indications of surgical removal of osteochondroma. Long-term results after surgical intervention. (2010)
22. Functional and aesthetic reconstruction of on extensive ablative preauricular skin defect using a modified cervicopectoral flap. (2010)
23. Bardach’s open rhinoplasty technique. A reliable approach for nose repair in cleft lip/ palate patients. (2010)
24. The role of titanium mess in reconstruction of extensive cranio-maxillofacial bone defects. (2010)