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: 01/2013 - M. Merli - M. Moscatelli - A. Mazzoni - G. Mariotti - M. Nieri
Lateral bone augmentation applying different biomaterials

Introduction: This paper describes the treatment of horizontal osseous defects around implants in a one-stage split-mouth approach in a middle-aged female patient.

Method and Material: The same identical reconstruction technique was performed in both surgical sites using different biomaterials: a ?-tricalciumphosphate (Ceros TCP granules) grafting material and a porcine, collagen pericardium resorbable membrane (Remotis) were employed on the test side and a deproteinized, bovine bone matrix (Bio-Oss) and a porcine, collagen resorbable membrane (Bio-Gide) on the control side. Bone substitutes were mixed with autologous bone (approximately 10%) harvested during implant insertion procedures.

Results: Substantial bone regrowth was evident in both ridges, although only the test side underwent complete regeneration. Histological examination of the regenerated areas showed the presence of mature bone organized around particles of biomaterial during the incorporation phase.

Conclusion: Both therapeutic approaches have proved favorable in terms of covering the initially exposed implant threads.

Citation:

Merli M, Moscatelli M, Mazzoni A, Merli M, Mariotti G, Nieri M: Lateral bone augmentation applying different biomaterials A clinical and histological evaluation of a case report. Z Zahnärztl Implantol 2013;29:70-79. DOI 10.3238/ZZI.0070-0079

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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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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

» read full article