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What is Interim obturator in cleft palate patients is placed at what time? and explain in detail?
Interim obturator:

Form during 2nd phase of post-surgical prosthodontic treatment.
Formed after 2-6 weeks postsurgically.
Main objective is to provide patient comfort & easy function till healing.
In small defects, in which patient is able to function normally with immediate surgical obturator, this interim obturator is not necessary.
Final definitive prosthesis made after 3-6 months post-surgery (Third phase)