Two-year evaluation of a variable-thread tapered implant in extraction sites with immediate temporization: a multicenter clinical trial


McAllister BS, Cherry JE, Kolinski ML, Parrish KD, Pumphrey DW, Schroering RL. Int J Oral Maxillofac Implants. 2012 May-Jun;27(3):611-8.


The purpose of this clinical trial was for a dentist to evaluate the survival rate, bone remodeling, and soft tissue health surrounding variable-thread tapered implants placed in fresh extraction sites and loaded immediately. If you are looking into getting dental implants, then consider contacting a cosmetic dentist for more information.


Sixty dental implants were placed in 55 patients at six centers according to a predetermined protocol. All dental implants were placed in extraction sockets and were subjected to immediate temporization. Definitive cosmetic dental implants were placed within the first year with a very careful dental implant surgery. Clinical and radiographic examinations were performed at implant placement and after 3, 6, 12, and 24 months. Assessments of implant stability, Papilla Index, plaque, peri-implant mucosa, and marginal bone levels were performed at the respective visits.


Fifty-five patients were treated and were restored with 58 single dental crowns and 1 two-unit fixed partial prosthesis. The cumulative survival rate was 98.3% after 2 years. One implant failed prior to 3 months. The mean marginal bone remodeling from implant insertion to 1 year was -0.22 ± 1.30 mm (n = 41), followed by an average bone gain of 0.12 ± 0.77 mm (n = 33) between 12 and 24 months. Mean marginal bone remodeling was -0.10 ± 1.38 mm (n = 35) from implant insertion to 2 years. Papilla size increased significantly over the 2-year study period. Patient assessments of function, esthetics, and self-esteem also showed significant improvement.


The 24-month results indicate that the variable-thread tapered implant can be used safely and effectively under demanding conditions as an immediate postextraction tooth replacement.

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