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International Journal of Oral Implantology



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Int J Oral Implantol (Berl) 10 (2017), No. 2     29. May 2017
Int J Oral Implantol (Berl) 10 (2017), No. 2  (29.05.2017)

Page 161-168, PubMed:28555206

A comparison of two implants with conical vs internal hex connections: 1-year post-loading results from a multicentre, randomised controlled trial
Cannata, Maurizio / Grandi, Tommaso / Samarani, Rawad / Svezia, Luigi / Grandi, Giovanni
Purpose: To compare the clinical and radiological outcomes of identical implants with conical or internal hex connections.
Methods: A total of 90 patients with partial edentulism requiring one implant-supported prosthesis were randomly allocated in two equal groups (n = 45) to receive either implants with a conical connection or implants of the same type, but with an internal hex connection at three centres. Patients were followed for 1 year after loading. Outcome measures were implant failures, any complication and marginal bone level changes.
Results: One patient (2.2%) belonging to the internal hex group dropped out. One implant (2.2%) failed in the conical group. There were no statistically significant differences in implant failures between the two groups (2.2% vs. 0%, difference 2.2; 95% CI: -1.3; 5.7; P = 0.315). Two complications occurred in the conical group and two in the internal hex group (P = 1.000, difference 0.00, 95% CI: -3.1; 3.1). The 12-month peri-implant bone resorption was similar in both groups: 0.56 ± 0.53 mm (95% CI 0.03; 1.09) in the conical group and 0.60 ± 0.62 mm (95% CI 0.02; 1.22) in the internal hex group (difference = 0.04 ± 0.55, 95% CI: -0.51; 0.59, P = 0.745).
Conclusions: Within the limitation of this study, preliminary short-term data (1 year post-loading) did not show any statistical differences between the two internal connection types, therefore clinicians could choose whichever connection they prefer.

Conflict of interest statement: Tommaso Grandi serves as consultant for J Dental Care, Modena, Italy. This study was completely self-financed and no funding was sought or obtained, not even in the form of free materials.

Keywords: complication, dental implant, conical connection, internal hex, peri-implant marginal bone levels