I treatment planned a patient for installation of a 4.1 mm x 12mm Straumann bone level implant in very dense D1 bone. I attempted a straight surgical pathway using a profile drill and tapped the osteotomy. When the implant reached a depth of 10mm, the mount broke and I could not advance it any more. I have never experienced this problem with Straumann tissue level implants. Have any of you experienced this problem? How do you recommend that I proceed?