【Yang Yeh】評論

摘錄自lindhe 7eCh38 regenerative surgery p909In a controlled study, however, it was demonstrated that deep and shallow defects have the “same potential” for regeneration (Cortellini et  al. 1998). Deep defects (>3 mm) resulted in larger linear CAL gain than shallow defects (3.7 ± 1.7 mm versus 2.2 ± 1.3 mm), but the percentage of CAL gain as related to the baseline defect depth was similar in deep (76.7 ± 27.7%) and in shallow (75.8 ± 45%) defects.Another important morphologic characteristic of the defect is the width of the intrabony component, measured as the angle that the bony wall of the defect forms with the long axis of the tooth (Steffensen & Weber  1989). Wider defects have been associated with reduced CAL and bone gain at 1 year (Tonetti et  al. 1993a, 1996a; Garrett et  al. 1988). In a study on 242  intrabony defects treated with membranes, Cortellini and Tonetti (1999) demonstrated that defects with a radiographic angle of ≤25° gained consistently more attachment (1.6 mm on average) than defects with an angle of ≥37°.