Abstract
BackgroundThere is a growing tendency to place single tooth implants immediately after extracting a failing tooth in the posterior region. The aim of this prospective case series pilot study was to evaluate immediate implant placement in molar post-extraction sites during a 1-year follow-up period.Materials and methodsFifteen consecutive patients with a single failing molar in the maxilla or mandible, and presenting enough bone to expect primary implant stability and an implant site free of infection, were included. The implants, with a large thread depth and sharp thread edges, were placed in each patient according to a two-staged surgical procedure. Three months later, a full contour screw-retained zirconia restoration with an angulated screw channel abutment was provided. Clinical and radiographic examinations were performed 1 month and 12 months after placing the restoration. In addition, the patients’ satisfaction with the restoration was scored after 12 months.ResultsFour out of 15 of the mobile implants had to be removed before the 1-year evaluation. The implant and restoration survival rates were 73.3% at the 1-year evaluation (n = 15). The mean marginal bone loss, from loading to the 12-month follow-up, was 0.17 mm (n = 11). The mean plaque, calculus, peri-implant mucosa, bleeding, and pocket probing depth scores were low, depicting healthy peri-implant conditions. The patients were very satisfied.ConclusionIt was demonstrated, within the limitations of this study, that immediate placement of regular diameter implants in molar post-extraction sites in the maxilla and mandible resulted in a high implant failure rate during a 1-year follow-up period.Trial registrationNetherlands Trial Register, NL8117. Registered 24 October 2019 - Retrospectively registered, https://www.trialregister.nl/trial/8117.
Highlights
There is a growing tendency to place single tooth implants immediately after extracting a failing tooth in the posterior region
It was demonstrated, within the limitations of this study, that immediate placement of regular diameter implants in molar post-extraction sites in the maxilla and mandible resulted in a high implant failure rate during a 1year follow-up period
It was suggested that wide diameter implants may have better results in the molar region than regular diameter implants [13, 14]), they were associated with a high failure rate [15]
Summary
One oral surgeon, experienced in implant dentistry, executed the surgical treatments and two experienced prosthodontists performed the restorative procedures. Restorative procedure An impression was made at implant level 2 weeks after the second stage of the surgery in order to fabricate a single crown. Outcome measures Clinical and radiographic evaluations were performed 1 month and 1 year after restoration placement. Patients were asked to complete a questionnaire 1 year after restoration placement; Success rate: calculated from the criteria of success as proposed by Albrektsson and colleagues in 1986 [18]. Radiographs were taken and evaluated 1 month and 12 months after restoration placement using a parallel technique, with an X-ray holder for periapical radiographs They were analysed using a specially designed computer software to perform linear measurements on digital radiographs.
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