In Tully's classification of lips, what is the descriptor for lips that are functional but not optimal?

In Tully's classification of lips, the descriptor for lips that are functional but not optimal is "potentially incompetent." This classification acknowledges that while the lips are able to perform their essential functions, such as sealing the oral cavity during rest and chewing, they do not achieve the ideal positioning or function. Lips classified as potentially incompetent may not completely fulfill all criteria for optimal function, which can lead to issues such as aesthetic concerns or minor difficulties in oral function, but they still maintain some level of competency.

Understanding this classification emphasizes the importance of assessing not just the functional capacity of the lips but also their efficiency and effectiveness in maintaining oral health and aesthetics. The term "potentially incompetent" is a nuanced descriptor, indicating that while there may be some limitations, the lips still serve a purpose.