A large body of evidence from animal and human studies indicates a link between chronic mild stress and bone loss [ 57– 57].
They divided them into four groups: those with normal T scores (a measure of bone density), those with mild osteopenia (less severe bone loss that often progresses to osteoporosis), and those with moderate or severe osteopenia.
BMD measurements are important as they can be used to better estimate the individual fracture risk, differentiate between mild and severe forms of bone loss, and select the appropriate treatment follow-up (grade A recommendation).
The subjects had mild peri-implantitis defined as radiographic bone loss of 1 2 mm, pocket probing depth (PPD) ≥4 mm and a positive bleeding on probing (mBoP) score.
Finally, previous data suggested that even a mild impairment of kidney function may lead to bone loss (25), underlying the importance of estimation of ClCr when evaluating patients for fracture risk.
Chewing under chronic stress prevents the increase in plasma corticosterone and noradrenaline levels, which attenuates both the reduced bone formation and increased bone resorption, and improves the trabecular bone loss and microstructural bone deterioration induced by chronic mild stress [ 27].
Accordingly in elderly men the occurrence of a mild to severe androgen deficiency could lead, directly or indirectly to bone loss (Boonen and Vanderschueren 2002).
The final decision about which bone grafting technique that is best is based on an assessment of the degree of vertical and horizontal bone loss that exists, each of which is classified into mild (2 3 mm loss), moderate (4 6 mm loss) or severe (greater than 6 mm loss).
Smith et al. reported ulnar wear in 13 of 17 (76 %) reviewed patients: grade 1 (partial-thickness cartilage loss) in 7, grade 2 (full-thickness cartilage loss) in 4 and grade 3 (bone loss) in 2. Hohman et al. report ulnar wear in all seven patients: mild (preserved joint space) in three, moderate (loss of joint space, but no bone loss) in two and severe (significant bone loss) in two.
Radiographic bone loss is also useful for assigning descriptors to indicate severity of periodontitis: <1/3 bone loss = mild, 1/3 to ½ bone loss = moderate, and >½ bone loss = severe.
