title: Stability Development of Immediately Loaded Hybrid Self-Tapping Implants Inserted in the Posterior Maxilla: 1-Year Results of a Randomized Controlled Trial.
abstract: The objective of the present study was to elucidate stability development of immediately loaded hybrid self-tapping implants inserted in the posterior maxilla. Forty-eight hybrid self-tapping implants with a chemically modified surface (∅4.1; length: 8 mm) were inserted bilaterally in the maxillary first and second premolar and first molar sites of 8 patients. In each patient, both sides of the maxilla were assigned randomly to either immediate (IL) or early (EL) loading group. Implant stability was evaluated by means of resonance frequency analysis immediately after implant placement and after 1, 2, 3, 4, 5, 6, 12, 26, and 52 weeks. High values of primary stability were found in both groups (71.91 ± 6.52 implant stability quotient [ISQ] in IL group; 73.87 ± 6.5 ISQ in EL group), with significant differences between the groups at the different time points. Initial decrease in stability was observed between the first and fifth weeks in the IL group and between the first and third weeks for the EL group. In the IL group 1 implant was removed after 3 weeks due to lack of stability. Early results of this study showed the ability of hybrid self-tapping dental implants with a chemically modified surface to achieve sufficient primary stability and to maintain high values of secondary implant stability in bone type 3 and 4, even when loaded immediately. Minimal alterations in stability were observed for both investigated groups, but the EL group showed faster recovery after an initial drop in stability.
authors.affiliation: 1   Oral Surgery Department, School of Dental Medicine, University of Belgrade, Serbia.|2   Department of Periodontics and Oral Medicine, School of Dentistry, University of Pretoria, South Africa.
authors.forename: Vladimir S
authors.initials: VS
authors.lastname: Todorovic
authors.affiliation: 3   Department of Dentistry, Faculty of Medical Sciences, University of Kragujevac, Serbia.
authors.forename: Miroslav
authors.initials: M
authors.lastname: Vasovic
authors.affiliation: 2   Department of Periodontics and Oral Medicine, School of Dentistry, University of Pretoria, South Africa.
authors.forename: Mia-Michaela
authors.initials: MM
authors.lastname: Beetge
authors.affiliation: 2   Department of Periodontics and Oral Medicine, School of Dentistry, University of Pretoria, South Africa.
authors.forename: Andre W
authors.initials: AW
authors.lastname: van Zyl
authors.affiliation: 4   Advanced Europe Medical Centre, Dental Department, Sharjah, United Arab Emirates.
authors.forename: Vladimir
authors.initials: V
authors.lastname: Kokovic
mesh_terms: D001641:Bicuspid; D003758:Dental Implantation, Endosseous; D015921:Dental Implants; D017267:Dental Prosthesis Design; D019232:Dental Restoration Failure; D006801:Humans; D008437:Maxilla
chemical_list: D015921:Dental Implants
keywords: hybrid self-tapping dental implants; immediate loading; implant stability; posterior maxilla