Vertical ridge augmentation of the atrophic posterior mandible with interpositional bloc grafts: bone from the iliac crest vs. XXXX anorganic bone. Clinical and histological results up to one year after loading from a randomized-controlled clinical trial.

@entity1 @entity1578 @entity291 @entity737
OBJECTIVES: To compare two different techniques for vertical bone augmentation of the posterior mandible: bone blocs from the iliac crest vs. anorganic @entity291 bone blocs used as inlays. MATERIALS AND METHODS: Ten partially edentulous @entity1 having 5-7 mm of residual crestal height above the mandibular canal had their posterior mandibles randomly allocated to both interventions. After 4 months implants were inserted, and after 4 months, provisional prostheses were placed. Definitive prostheses were delivered after 4 months. Histomorphometry of samples trephined at implant placement, prosthesis and implant failures, any complication after loading and peri-implant marginal bone-level changes were assessed by masked assessors. All @entity1 were followed up to 1 year after loading. RESULTS: Four months after bone augmentation, there was statistically significant more residual graft (between 10% and 13%) in the Bio-Oss group. There were no statistically significant @entity1578 . Two implants could not be placed in one @entity1 augmented with autogenous bone because the graft failed whereas one implant and its prosthesis of the Bio-Oss group failed after loading. After implant loading only one complication ( @entity737 ) occurred at one implant of the autogenous bone group. In 16 months (from implant placement to 1 year after loading), both groups lost statistically significant amounts of peri-implant marginal bone: 0.82 mm in the autogenous bone group and 0.59 mm in the Bio-Oss group; however, there were no statistically significant differences between the groups. CONCLUSIONS: Both procedures achieved good results, but the use of @entity291 blocs was less invasive and may be preferable than harvesting bone from the iliac crest.
