system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Least desirable maxillary major connector is:
assistant
The correct answer is  U' shaped (or) Horse shoe shaped major connector:

Least desirable palatal major connector.
Poorest designed palatal major connector, because it lacks rigidity.
This is indicated only in cases of inoperable tori, extending to the posterior limit of the hard palate.
It lacks rigidity.
This design leads to increased ﬂexibility and movement at the open ends.
The wider the coverage, the more it resemble a complete palate (palatal plate).