Читать книгу Vertical 2: The Next Level of Hard and Soft Tissue Augmentation - Istvan Urban - Страница 34

Most studies investigating VBA report only mean vertical bone gain (absolute bone gain) and fail to calculate the relative percentage of bone gain with respect to initial defect size. We detected significant indirect correlations between baseline vertical deficiency and the amount of bone gained: as the baseline deficiency increased millimeter by millimeter, the probability of achieving complete regeneration decreased by 2.5 times. VBA achieved 6% to 12% greater relative bone gain when used for smaller height deficiencies (< 5 mm) compared with larger ones (≥ 5 mm) (Fig 2-4).

Ours may be the first VBA study to investigate the effect of defect location on height gain. We did not find significant differences between the maxilla and mandible in terms of bone gain. However, the location of the defect within either jaw statistically influenced the amount of augmentation generated. In the maxilla, absolute bone gain was statistically greater in the posterior than the anterior area, with a mean difference of 0.36 mm. In contrast, absolute bone gain in the mandible was statistically greater in the anterior than in the posterior area, with a mean difference of 0.32 mm. The mean height gain differences were < 0.5 mm, which may have no clinical significance.