|Metabolic Bone Diseases
RICKETS & OSTEOMALACIA
-result from inadequate serum & extracellular levels of calcium &phosphate ,minerals required for the normal calcification of bone & teeth.
-result from adefect in the normal activity of the metabolites of vitamin D.
-rickets the disease affects the growing skeleton in infants & children
-osteomalacia this disease affects the mature skeleton in adults .
**radiogrphic features :
-Radiographic changes associated with the teeth in Rickets , rickets in infancy or early childhood may result in hypoplasia of developing dental enamel . if the disease occurs before the age of 3 years ,enamel hypoplasia is fairly common . radiographs may reveal this early manifestation of rickets in unerupted & erupted teeth . lamina dura & cortical boundary of tooth follicles may be thin or missing .
-Osteomalacia does not alter the teeth because they are fully developed before the onset of the disease , the lamina dura may be thin with long standing or severe osteomalacia . in osteomalacia , bone problem occur , thin cortices and pseudo fractures but teeth are not involved.
-bone changes are the same in the rickets & osteomalacia , bones are soft in general , deformity occur especially in weight bearing bones , so legs bowing occur and greenstick fractures appear .
-rare inherited disorder that is caused by either reduced production or defective function of alkaline phosphatase "this enzyme is required for normal mineralization of osteoid" .
-we see this disease in adults , because in the children rare , in infant very severe'' fetal''
-teeth + bone are affected….. "this is the idea in systemic desease the bone & teeth are involved"
-like any disease without proper mineralization …. Poor growth ,fractutes , closure proplems,poor calcification .
-generalized radiolucency of the mandible & maxilla , cortical bone & lamina dura are thin ,& alveolar bone is poor calcified & may appear deficient….. both primary & permenant teeth have thin enamel & large pulp chambers & canals , the teeth may be hypoplastic & may be lost prematurity .
-Renal disease is associated with secondary hyperparathyroidism with radiolucent apperance
-long term renalfailure may be give radiolucent appearance OR radiopaque appearance''sclerotic appearance ''
-in the radiographs radiolucency, no cortex "very thin " black area",loss of bone mass, loss of lamina dura ,"resorpative pattern"
- in other pic sclerotic "radiopaque" bone"sclerotic pattern"
-vitamin D resistant rickets , it exactly look like it ,,but the gentic background is the deffrence
- teeth will be affected
-soo clinically & radiographs are similar
- in the radiographs thers deffrential diagnosis .. may br rickets ,hypophosphatemia, hypophosphatasia,hyperparathyroidism ….. sooo it depends on history background ("family history ,,, or about sclera "about osteogenesis imperficta " ,,,renal disease …..)
-albers-schonberg &marble bone disease
-inherited(recessive & dominant)
-we have too much bone
-sereously dense bone
-the bone is dens ,fragile that are susceptible to fracture" brittle" & infection
-results from defect in the defrentiation & function of osteoclasts . the lack of normally osteoclasts results in abnormal formation of primary skeleton & generalzed increase in bone mass
-the pt. has progressive loss of the bone marrow & its cellular products & severe increase in bone density.
-good case to osteomylitis start
- orally impaction problems
-osteopetrosis showing dense clacification of all the bones , skull , facial,chest, pelvis …..
- we cant do surgery"risk of osteomylitis" for this pts. Soo …prevention,fluoride. scaling
Other systemic disese:
Sickle cell anemia & thalasemia
-theres active bone marrow space
-hair on end appearance
The face develops prominent cheekbones & protrusive premaxilla
-n the radiographs :
Thick diploic space , thin cortex , hair-on-end bone pattern , granular appearance of the skull , large bone marrow spaces , change in the bone shape,,,,,, thick body of mandible
-they come to clinic because of face shape " CC" ,,,
- connective tissue problem,, in collagen ,,, the pt come to clinic with limited mouth opening, tight skin………
- causes symmetric & generalized widening of periodontal ligament space