The Correct Answer is D
“a” is a correct statement “ The apical portion of the implant should be within the cortical bone of the inferior border.” (P. 399)
“b” is a correct statement: “In the severely atrophic mandible, the shortest implant may be longer than the available bone. Implants may be placed purposefully perforating the inferior cortex.” (P.403)
“c” is a correct statement “If mobility is detected, the implant should be removed at that time. The failed site is allowed to heal (at least 12 months) and another implant can be placed at a later time.” (P. 374)
“d” is an incorrect statement. “...since the maxilla is primarily cancellous bone, osteointegration requires a longer healing period.” (P. 373)
“e” is a correct statement as per the table provided on page 392 ( table 15.2...minimum integration times)
Contemporary Oral and Maxillofacial Surgery, Petterson, Ellis, Hupp, Tucker, second edition. 1993.
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