Abstract
The aim of this prospective case series study was to assess the clinical performance of single restorations in the posterior mandible supported by 6-mm implants. Twenty-one consecutive patients with one or more missing premolars or molars in the posterior mandible and with an estimated bone height of 8 mm between the top of the ridge and alveolar nerve were included. Each patient was to receive one or more 6-mm implants (OsseoSpeed 4.0 S, Astra Tech Implant System, Dentsply Implants, Mölndal, Sweden) without any grafting. After a 3-month osseointegration period, the implants were restored with custom-made titanium abutments (Atlantis abutment, Dentsply Implants) and cemented zirconia-based porcelain crowns. Clinical and radiographic examinations were performed at placement of the restoration and 12 months thereafter. Next to this, patients' satisfaction was scored before treatment and after 12 months with the restoration in function. Implant survival was 100%. From loading to the 12-month follow-up, mean marginal bone loss was 0.14 mm (SD: 0.4). Mean scores for plaque, calculus, gingiva, bleeding, and pocket probing depth were low. Patients' satisfaction was high. One-year follow-up data revealed that 6-mm dental implants inserted in the resorbed posterior mandible provide a solid basis for single tooth restoration.
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