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use of the trephine for creating an opening in the skull or in the sclera.
dental trephination surgical creation of a fistula by puncturing the soft tissue and bone overlying the root apex to provide drainage. Called also apicostomy.
Surgical creation of a drainage tract with a bur or sharp instrument in the soft tissue or bone overlying a tooth root apex. This is usually done to permit drainage of an apical abscess.Synonym: apicostomy