Clinical Evaluation of a Cancellous Block Allograft for Ridge Augmentation and Implant Placement: A Case Report

Abstract

A number of grafting materials have been used in vertical and horizontal ridge augmentation to enable implant placement in optimal positions. Autogenous block grafts from intraoral or extraoral sites have been used with positive results. Allograft blocks with cortical bone are also used for ridge augmentation. In this case report, a cancellous allograft block was used for horizontal augmentation of the maxilla. The observed increase in ridge width allowed subsequent implant placement after a 5 month healing period. After 4 months the implant was uncovered and restored as a unit in a 4-unit fixed splinted implant reconstruction. The result suggests that cancellous block allografts may be a promising alternative to autogenous block grafts or cortical allograft blocks in treatment of deficient maxillary alveolar ridges to allow subsequent implant placement in optimal position.

Horizontal Resorption of Fresh‐Frozen Corticocancellous Bone Blocks in the Reconstruction of the Atrophic Maxilla at 5 Months

“…38,39 Therefore, FFB possesses necessary strength and rigidity to allow stable fixation in the recipient area. 40 A systematic review 41 included nine studies, [42][43][44][45][46][47][48][49][50] but excluded the ones that examined freshfrozen allografts. They were mainly case reports and case series describing the outcomes of freeze-dried allografts, and eight out of them used barrier membranes.…”

Effect of bone block graft with rhBMP-2 on vertical bone augmentation

“…In particular, CHBB alone has shown a good outcome in partial bone augmentation. The outcome of CHBB alone in wide vertical ridge augmentation cannot be predicted because most previous studies have been conducted in the narrow area of the anterior maxilla 11,22 and for partial lateral ridge augmentation. In the present study, CHBB had a beneficial effect on new bone formation and the maintenance of the grafted area regardless of the application methods.…”

Are Bone Allografts Safe and Effective for Today’s Dental Practitioner?

“…Not only did the authors find the graft successful (allowed implant placement) but they suggested "cancellous block allografts could be a promising alternative to autogenous block grafts." Wallace and Gellin [72] reached the same conclusion when they followed this initial study up with a published 12 patient case series in 2010 that also had a 100% graft success rate (no grafts were lost by 5 months following placement). The authors also had a 100% implant success rate as "no implants failed during the 4 month integration period."…”

“…The authors also had a 100% implant success rate as "no implants failed during the 4 month integration period." Wallace [73] recently published a study utilizing cancellous particulate FDBA in combination with a membrane composed of decellularized dermis to preserve extraction sites for implant placement in six patients. Histologic analysis showed a "significant percentage [average 12.8%] of new bone regeneration after 12 weeks in molar extraction sites.…”