Uses of RTV silicone in orbital reconstruction

Area of Science:

• Ophthalmic surgery
• Biomaterials science
• Plastic and reconstructive surgery

Background:

• Enucleation can lead to cosmetic deformities like enophthalmos and superior sulcus depression.
• Existing surgical corrections may have limitations in achieving optimal cosmetic outcomes.
• The need for biocompatible and adaptable orbital implants is crucial for patient satisfaction.

Purpose of the Study:

• To evaluate the efficacy and safety of room-temperature vulcanizing (RTV) silicone for surgical correction of enophthalmos and superior sulcus depression.
• To assess the tissue response and implant stability of in situ vulcanizing silicone.
• To explore the utility of RTV silicone as a stent in socket reconstruction.

Main Methods:

• A five-year follow-up study involving 42 patients with unsatisfactory cosmetic results post-enucleation.
• Surgical implantation of RTV silicone subperiosteally in the orbit to address volume deficits.
• Histological evaluation of tissue tolerance in 30 rats comparing prevulcanized and in situ vulcanized silicone.
• Application of RTV silicone as a stent in 11 cases of contracted socket reconstruction.

Main Results:

• RTV silicone successfully corrected enophthalmos and superior sulcus depression, with implants conforming to the orbital wall without migration.
• Histological studies in rats showed no significant difference in tissue tolerance between prevulcanized and in situ vulcanized silicone.
• RTV silicone proved effective as a stent in maintaining pressure and socket size during contracted socket reconstruction.

Conclusions:

• In situ vulcanizing RTV silicone is a safe and effective biomaterial for correcting orbital volume deficits and improving cosmetic outcomes after enucleation.
• The material demonstrates excellent biocompatibility and stability, making it suitable for orbital reconstruction.
• RTV silicone offers a versatile application, serving both as a primary implant and a supportive stent in complex orbital cases.