Tehran University of Medical Sciences Journal of Craniomaxillofacial Research 2345-5489 10 1 2023 08 20 27 30 EN Fulya Gulener Institute of Health Sciences, Prosthodontics PhD Program, Istanbul University, Istanbul, Turkiye. Mustafa Mert Acikgoz Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Istanbul University, Istanbul, Turkiye. Deger Ongul Department of Prosthodontics, Faculty of Dentistry, Istanbul University, Istanbul, Turkiye. Gulsum Ak Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Istanbul University, Istanbul, Turkiye. 2023 05 08 2023 06 19 Endosteal implants may be insufficient in treating complete edentulism in severe bone loss, such as advanced bone resorption, trauma, infection, intraoral pathologies, and traumatic tooth extractions.  With the developing technology, in cases where bone quality and quantity are inadequate,  treatment with custom-made subperiosteal implants also emerges as an alternative. This case  report examined the procedural steps and the six-month post-operative period while evaluating our edentulous patient who rehabilitated using endosteal and custom-made subperiosteal implants.  No resorption or mobility of the implants was detected in the 6th-month post-operative control of  our complete edentulous case, which was rehabilitated using traditionally used intra-bone implants in the maxilla and subperiosteal implants in the mandible. One of the essential advantages of the  subperiosteal implant system is that it provides fixed prosthetic treatment, especially in jaws with  advanced bone atrophy. Correct case selection and appropriate surgical and prosthetic treatment will increase success.  Keywords: Dental implantation; Endosteal; Mouth rehabilitation; Subperiosteal. https://jcr.tums.ac.ir/index.php/jcr/article/view/440 https://jcr.tums.ac.ir/index.php/jcr/article/download/440/373