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Tapered Versus Inverted Body-Shift Implants Placed Into Anterior Post-extraction Sockets: A Retrospective Comparative
Stephen J Chu1, Jocelyn H P Tan-Chu2, Hanae Saito3
1Adjunct Clinical Professor, Ashman Department of Periodontology and Implant Dentistry, Department of Prosthodontics, New York University College of Dentistry, New York, New York.
Background:
A retrospective comparative radiographic and clinical studywas performed to evaluate primary stability, bone volume, and esthetic outcomes of tapered (T) implants (control group) versus inverted body-shift (INV) implants (test group).
Methods:
A total of 42 platform-switched implants, 21 T and 21 INV, were used to replace nonrestorable teeth in maxillary central incisor post-extraction sockets. Implant primary stability and insertion torque values in addition to radiographic differences in labial plate dimension, tooth-to-implant distance, and marginal bone levels were correlated with clinical outcomes using the pink esthetic score (PES).
Results:
Statistically significant differences (P ≤ .05) were found between groups, with T implants having not only lower primary stability at immediate implant placement than INV implants but also less circumferential bone volume at recall. Consequently, lower PESs were seen in the T implant group that equated to an increased frequency of midfacial recession, tissue discoloration, and papilla loss.
Conclusions:
INV implants, which feature a unique macro hybrid design, may offer advantages over T implants in maxillary anterior post-extraction sockets with regard to achieving both higher primary stability and superior esthetic outcomes.
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