Which of the following is true regarding membranes with a resorption period of 8 to 18 weeks?

The statement that membranes with a resorption period of 8 to 18 weeks maintain space in extraction sites is accurate because these membranes are designed to act as barriers that prevent the invasion of non-osteogenic tissues into the space created after tooth extraction. By doing so, they facilitate the proper healing of the bone and surrounding tissues, allowing for the preservation of the extraction site and the promotion of bone regeneration.

These membranes play a critical role in various surgical procedures, including Ridge Preservation and Guided Bone Regeneration (GBR), where maintaining the space is essential for successful outcomes. The specific resorption period of 8 to 18 weeks ensures that the membrane remains in place long enough to support the healing process before it is eventually absorbed by the body. This timing is critical because it aligns with the natural bone healing and regeneration process, making them beneficial in clinical practice.

Other options do not provide complete or accurate information regarding the function and application of these membranes within the context of dental implantology. Therefore, the chosen answer correctly highlights a vital characteristic of this type of membrane in its clinical use.