Jaw, Edentulous, Partially Clinical Trial
Official title:
A Prospective, Randomized-Controlled Evaluation of the Osseotite CP4 Certain Prevail Tapered Implant for the Preservation of Crestal Bone
A potential complicating factor affecting implants is crestal bone loss. The causes of
crestal bone loss are attributed to several factors. Among those hypothesized, proof for one
or another cause remains obscure. Clinical documentation suggests that implant design may be
a key factor. While the evidence is inconclusive, various authors suggest that it is a
result of a combination of effects including (1) limited drilling procedure and restricted
second-stage surgery 2, (2) rough implant surface in crestal bone 3, (3) microthread design
for implant stiffness 4, (4) loading along a conus versus a flat interface 5, and (5) the
absence of a significant microgap 6.
The practice of platform switching (e.g. placing a 4 mm diameter abutment on a 5 mm implant
seating surface physically moves the inflammatory cell infiltrate zone away from the crestal
bone). The growing body of anecdotal platform switch evidence supports this biological width
hypothesis. Here the biological width refers to the height of the dento-gingival attachment
apparatus around a normal tooth and is defined as the distance necessary for a healthy
existence of bone and soft tissue from the most apical extent of a dental restoration.
To formally test this hypothesis the current study has been designed. The Prevail implant
has been made with an integrated medialized seating surface that establishes a platform
switching function. This implant moves the implant/abutment interface away from the crestal
bone and may therefore reduce the amount of bone loss observed in the standard
(non-medialized) Osseotite implant design. The objective of this study is to evaluate
crestal bone levels adjacent to the implant reference point from the time of implant
placement to a period of two years after loading.
n/a
Allocation: Randomized, Endpoint Classification: Safety/Efficacy Study, Intervention Model: Parallel Assignment, Masking: Double Blind (Subject, Investigator), Primary Purpose: Treatment
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