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The International Journal of Prosthodontics
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Int J Prosthodont 31 (2018), Nr. 5     8. Okt. 2018
Int J Prosthodont 31 (2018), Nr. 5  (08.10.2018)

Seite 446-450, doi:10.11607/ijp.5776, PubMed:29772035, Sprache: Englisch


Two-Step Immediate Loading of Mandibular Overdentures Retained by Mini-implants: A Prospective Clinical Study
Park, Jin-Hong / Shin, Sang-Wan / Leea, Jeong-Yol
Purpose: This study aimed to evaluate treatment outcomes of mandibular overdentures retained by two different mini-implant systems with ball attachments under a two-step immediate loading protocol.
Materials and Methods: This clinical trial investigated treatment outcomes of mandibular mini-implant overdentures in 45 edentulous patients. MDI implants (3M ESPE) and SlimLine implants (Dentium) were randomly selected for placement in the anterior mandible in each group (MDI = 21; SlimLine = 24) with a flapless surgical approach. The side of the tissue in the region of the complete mandibular denture where mini-implants were placed was immediately relined with soft reliner (COE-SOFT). The female components were attached on the dentures 2 months after implant placement. Clinical and radiographic data were collected during follow-up. Statistical analyses were performed using SPSS software version 22.0 (α = .05).
Results: A total of 177 mini-implants were inserted in the anterior mandibles of 45 totally edentulous patients. There were five implant failures (97.2% success rate) and no significant differences between the two implant groups. Most mini-implants showed stable initial Periotest values (a mean ± standard deviation of 1.03 ± 3.65 mm) and a mean marginal bone loss of 0.50 ± 0.75 mm at 12 months. Multiple regression analysis revealed that implants ≤ 2.4 mm in diameter had higher Periotest values than those ≥ 2.8 mm. Intial Periotest values significantly influenced implant failure (P < .05).
Conclusion: There were no significant differences in treatment outcomes between patients treated with MDI or SlimLine implants. Mini-implants with wider diameters showed higher initial stability than those with narrow diameters, which may influence implant survival.
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