Benjamin J. Greenstein

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 In recent years, marine scientists have become increasingly alarmed over the decline of live coral cover throughout the Caribbean and tropical western Atlantic region. The Holocene and Pleistocene fossil record of coral reefs from this region potentially provides a wealth of long-term ecologic information with which to assess the historical record of(More)
BACKGROUND Bone decortication is often performed as part of a guided bone regeneration (GBR) procedure. The biologic rationale for decortication of bone is to allow progenitor cells easy access to a GBR-treated site and to facilitate prompt angiogenesis. It also may enhance the physical connection between a bone graft and a recipient site. However, the(More)
An in situ survey of deep reef environments (20 and 30 m) was conducted to determine the degree to which the community structure of live reef coral assemblages was faithfully represented in the adjacent death assemblages accumulating on the sea floor. Relative abundance of species was significantly different between life and death assemblages, and zonation(More)
BACKGROUND This retrospective radiographic evaluation provided a comparative assessment of long-term alterations of alveolar bone levels at sites with angular and horizontal bony defects that underwent open-flap debridement and did not undergo resective or regenerative periodontal therapy. METHODS The investigation included 50 patients (27 met inclusion(More)
In this era of increased dental implant use, there is a tendency to underestimate the long-term prognosis of a tooth with a compromised periodontium (treated or untreated). This can result in premature extraction of a tooth because of the rationalization that its retention can damage a future implant site, or its inclusion in prosthesis is too risky. Data(More)
BACKGROUND Primary and tension-free closure of a flap is often required after particular surgical procedures (e.g., guided bone regeneration). Other times, flap advancement may be desired for situations such as root coverage. METHODS The literature was searched for articles that addressed techniques, limitations, and complications associated with flap(More)
The primary restoration of traumatically amputated digits is now routinely possible through the use of microvascular and microneural surgical techniques. The anatomy of the scalp, penis, ear, and nose makes them suitable subjects for application of these techniques. It has been the belief of many authors, as summarized by Grabb and Dingman, that venous(More)
We are developing a system to help users improve the quality of their sleep by monitoring environmental factors that disrupt sleep and providing feedback. This system, called Lullaby, has several design goals. Lullaby’s sensor suite should be practical for deployment into bedrooms: it must be unobtrusive, inexpensive, and respect users’ privacy in this(More)
The surgical techniques involved in a discipline as comparatively new and complex as replantation might be expected to result in a significant rate of complications. However, serious complications related to replantation surgery remain relatively infrequent. Meticulous attention to detail helps to avoid predicaments, minimizes potential problems, and allows(More)