Are maxillary downgrafts stable?

Hi, How can maxillary downgrafts be made more stable? -What materials are better? (Own bone, cadaver, bone substitute) -Is there a need for overcorrection? -What is the relapse rate? -Does a downgraft have the opposite effect on the nose that impaction has? -Will the lip elongate with a downgraft (thus covering the teeth)? I was over-impacted and wondering if a downgraft to return the maxilla to its previous position is possible and what needs to be taken into account.

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