Research

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ORIGINAL STUDY
Issue: 02/2013 - M. Stopper - M. Lorenzoni - - S. Vogl - WA Wegscheider
Immediately and conventionally loaded implants in the edentulous mandible

Objective: The aim of this current investigation was to evaluate clinical outcomes of conventional and immediate loaded implants and Dolder bars in the interforaminal region of the lower jaw after 5 years of clinical function.

Materials and methods: 160 implants were inserted in the interforaminal region. 20 patients of the control group were treated after a healing period of 3 months and 20 patients of test group were loaded within one week with Dolder bars and overdentures. Annual radiographic bone resorption, Periotest values and survival rates were recorded and evaluated.

Results: All implants (160 implants) were placed with an insertion torque of more than 20Ncm. The evaluated mean coronal bone loss increased from 0.56mm to 1.91mm after five years of clinical function in the control group and from 0.55mm to 1.98 mm in the test group. The median Periotest value was between –4 and –5 for the immediately loaded and the conventionally restored implants. After an observation period of 5 years the survival rate was 100% in both groups.

Conclusion: These results after 5 years of loading suggest that interforaminal implants can be treated conventionally and immediately and restored with Dolder bars with clinically predictable outcomes with stable coronal bone levels.

Citation:

Lorenzoni M, Stopper M, Vogl S, Wegscheider WA: Immediately and conventionally loaded implants in the edentulous mandible. Z Zahnärtzl Implantol 2013;29:130?138

DOI 10.3238/ZZI.2013.0130?0138

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Issue: 02/2013 - M. Stopper - M. Lorenzoni - - S. Vogl - WA Wegscheider
test Immediately and conventionally loaded implants in the edentulous mandible

Objective: The aim of this current investigation was to evaluate clinical outcomes of conventional and immediate loaded implants and Dolder bars in the interforaminal region of the lower jaw after 5 years of clinical function.

Materials and methods: 160 implants were inserted in the interforaminal region. 20 patients of the control group were treated after a healing period of 3 months and 20 patients of test group were loaded within one week with Dolder bars and overden

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Issue: 03/2013 - R. Schneider - R. Hinkle - D. Galasso - P. Zeman
Clinical report on a follow-up of 415 implants with two designs: a multicenter retrospective analysis and a case report

Introduction: The purpose of this report is to evaluate survival rates of 2 implants with slightly different machined collar height and body design (1.0mm vs. 1.5mm, cylindrical vs. cylindric-conical) but with the same enossal surface. The implants were placed in partially and fully edentulous patients in three centers. A retrospective chart review study was undertaken to evaluate the performance of implant based restorations. Mesial and distal alveolar bone heights were evaluated radiographically.

Material and Methods: Data were collected by 3 practitioners on 2 different design implants. Implant survival was calculated. Change in alveolar bone level was measured from periapical radiographs.

Results: 154 treated patients were followed up for 1.8 years. Included were 18 patients with 64 implants that had a minimum of 60 Gy radiation to the area due to treatment for their previous malignant disease. Failure to obtain osseointegration was seen in 3 patients who received 4 implants. The overall implant survival rate was 99.0%, implant failure rate 0.7% prior to and 0.2% after the restoration.

Discussion: Both implant types appear to be a satisfactory choice for treatment of either the totally or partially edentulous patients in both simple and complex situations. This conclusion is supported by the outcome obtained in a patient edentulous both in the upper and lower jaw. Eight years after surgery both overdentures were intact and stable with normal function. No difference was observed in the previously irradiated patients.

Citation:

Schneider R, Hinkle R, Galasso D, Zeman P: Clinical Report on a Follow-up of 415 Implants With Two Designs: a Multicenter Retrospective Analysis and a Case Report. Z Zahnärztl Implantol 2013;29:214–229

DOI 10.3238/ZZI.2013.0214–0229

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Issue: 04/2013 - E. Schneider - G. Wahl
Radiographic detection of artificial bone lesions adjacent to dental implants in human jaw – an in-vitro study model

Introduction: The aim of this study was to evaluate the diagnostic efficacy of conventional intraoral radiographs for detection of bone lesions adjacent to dental implants in an ex-vivo model. Furthermore, the authors aimed to characterize additional factors influencing their detectability.

Materials and Methods: In 19 human cadaver bloc sections from upper and lower jaws provided with implants, artificial defects with progressively increasing size (n=9) were created. Two analogue intraoral radiographs were taken of each defect (orthoradial and oblique technique). Six investigators were asked to decide on the presence of a bony lesion on 380 randomly presented radiographs. Linear regression analysis was performed to evaluate data.

Results: The minimum size of a defect, which was detected by almost 50 percent of the observers, was 1.8mm in diameter. The radiographic detection correlated with an increasing size of the defect and was more frequent when the intraoral radiograph was taken with the oblique technique. In addition, the defect's location (oral or buccal side of the implant) and the bone structure (maxilla or mandible) were of major concern. There was a significantly higher rate of detection for bone lesions in the maxilla and if the defect was near to the intraoral x-ray film.

Discussion: If there is a reasonable suspicion for bone lesions near implants, which are not visible in standard periapical films, an additional x-ray taken with the oblique technique can provide further information. For the visualization of very small defects different imaging methods may be considered.

Citation:

Schneider E, Wahl G: Radiographic detection of artificial bone lesions adjacent to dental implants in human jaw – an in-vitro study model. Z Zahnärztl Implantol 2013;29:308–320

DOI 10.3238/ZZI.2013.0308–0320

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