A 49-year-old lady has lost #2-4 for quite a while (Fig.1 (CBCT sagittal section), no indication for antibiotic study (for cases with <6 months post extraction)).  Bone height at #2 and 3 is limited.  Bone density at the medulla is low, while that at the cortices high.

Trephine Bur

Xin Wei, DDS, PhD, MS 1st edition 08/23/2015, last revision 08/23/2015