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International Journal of Periodontics & Restorative Dentistry
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Int J Periodontics Restorative Dent 40 (2020), No. 4     30. June 2020
Int J Periodontics Restorative Dent 40 (2020), No. 4  (30.06.2020)

Page 539-547, doi:10.11607/prd.4583, PubMed:32045469


Changes in Peri-implant Soft Tissue Thickness with Bone Grafting and Dermis Allograft. Part II: A Comparative Retrospective Case Series Using a Subcrestal Angle Correction Implant Design
Levin, Barry P. / Saito, Hanae / Reynolds, Mark A. / Chu, Stephen J.
Immediate tooth replacement therapy (ITRT) in the maxillary anterior sextant is an increasingly frequent treatment option sought by patients and performed by clinicians worldwide. Achieving long-term results that are predictable, stable, esthetic, and healthy is the ultimate goal. This trend also lends itself to minimally invasive surgery as well as defining the procedure to a singular surgical intervention. Preserving and augmenting hard and soft tissues at the time of immediate implant placement provides the best opportunity to achieve these goals. Incorporating an implant with a subcrestal angle correction [SAC] or biaxial feature facilitates screw retention of both provisional and definitive restorations through the cingulum portion of the crown. Compared to uniaxial implants, these implants also feature an extended or variable platform switch [VPS] facially. Measurements of the peri-implant soft tissue thickness 2.0 mm apical to the facial free gingival margin were compared between two groups of 15 consecutively treated patients with different implant designs to evaluate the effect of SAC/VPS for ITRT. The null hypothesis was that there is no difference between uniaxial and biaxial implants with bone grafting and dermis allograft. These authors contend that using a combined hard and soft tissue grafting approach along with SAC/VPS biaxial implants has a synergistic effect on increasing peri-implant soft tissue thickness compared to uniaxial implants.