Bone regeneration in sinus lifts: comparing tissue-engineered bone and iliac bone

Area of Science:

• Oral and Maxillofacial Surgery
• Biomaterials Engineering
• Regenerative Medicine

Background:

• Sinus floor lifting is crucial for dental implant placement, requiring bone augmentation.
• Tissue-engineered bone has not yet matched the success of traditional grafts in maxillofacial surgery.
• Periosteum-derived tissue-engineered bone was investigated as an alternative augmentation material.

Purpose of the Study:

• To evaluate the clinical outcomes of dental implants placed after sinus floor augmentation with periosteum-derived tissue-engineered bone.
• To compare the success rates of tissue-engineered bone grafts versus autologous bone grafts in sinus lifts.
• To determine the reliability and potential limitations of tissue-engineered bone for sinus augmentation.

Main Methods:

• Periosteal cells were cultured and seeded onto polymer fleeces to create cell-polymer constructs.
• These constructs were used for sinus floor augmentation in 35 patients, with simultaneous or delayed dental implantation.
• A control group (41 patients) received autologous bone grafts for augmentation.

Main Results:

• The control group using autologous bone grafts demonstrated significantly higher success rates for both augmentation and implant survival.
• Failure of augmentation was more frequent in the tissue-engineered bone group, especially in larger augmented areas.
• Eleven implants were lost in the study group compared to only one in the control group.

Conclusions:

• Sinus floor lifting with autologous bone is more reliable than with periosteum-derived tissue-engineered bone grafts.
• While lamellar bone formation occurs, the clinical application of this tissue-engineered bone requires limitations.
• Further advancements are necessary to enhance the efficacy and predictability of tissue-engineered bone in oral surgery.