Research

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ORIGINAL STUDY
Issue: 03/2012 - H. Neller - M.-A. Geibel
Comparison of different cone-beam computed tomography scans of a human head preparation created using the 3D eXam (KaVo) for analysis of the image quality

Introduction: Differences in the picture quality and accuracy of digital representations of a human head preparation are to be assessed by visual analysis and comparison of distance measurements and measurements of Hounsfield Units.

Methods: 55 records of a human head preparation are created with the 3D eXam (KaVo) and are evaluated using the 3D eXam Vision software (KaVo).

Results: All records have reproducible results. The analysis of the cone-beam computed tomography scans shows an improving image quality and detail with increasing resolution. The comparison of scans shows slight differences in the values of distance measurements and measurements of Hounsfield Units.

Conclusion: Different cone-beam computed tomography scans show an improved image quality and detail with increasing resolution, but provide slightly different values for distance measurements and measurements of Hounsfield Units. The slightly occurring differences are negligible since they also occur in the same order of magnitude in the comparison of records created in the exactly identical recording mode.

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Issue: 04/2012 - G. C. Scheiderbauer
Clinical application of piezo-surgical hydrodynamic sinus lift procedures in combination with augmentation and implantation

Introduction: The aim of this retrospective study was to assess the success of hydrodynamic sinus lift using a piezo-surgical instrument with simultaneous augmentation and implantation and compare it with alternative techniques.

Materials and method: Between December 2007 and July 2009 109 hydrodynamic sinus lift procedures were performed in 100 patients using the TKW-5 trumpet, a piezo-surgical instrument, accompanied by augmentation with autologous bone.

Results: The study involved placing 130 implants in the atrophic posterior maxilla. The initial bone height was between 2mm and 10.2mm. The sinus floor was augmented with autologous bone grafts from the maxillary tuberosity and from the retromolar mandible, where necessary. The hydrodynamic sinus lift procedures were successful in 82 cases. Perforation of the maxillary sinus membrane was observed in 27 cases; these were repaired through a lateral window, covering the perforation with an absorbable collagen membrane (Resorba: “Kollagen-resorb”). Augmentation and implantation were then carried out. There was no association between perforation and the average bone height.

The second surgery was performed six months after implant placement, and healing caps were inserted with 20 Ncm. All 130 implants were osseointegrated. Patients were instructed to use the superstructure carefully for three months. Radiographic follow-up of the implants and regenerated situation took place one year after prosthetic restoration.

Conclusion: The advantages of the hydrodynamic sinus lift procedure using the TKW-5 trumpet include less time required for surgical treatment, fewer post-surgical problems, less swelling, no lateral window in the maxilla, and a good prognosis for osseointegration. This technique is an alternative to the lateral window technique for sinus floor augmentation but is not a substitute if the sinus membrane is perforated.

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Issue: 04/2012 - X. Hu - C. Hunn-Stohwasser - J. Mehrhof - P. Schaller - F. Beuer - K. Nelson - S. Nahles
Essentials of German phonetics for prosthetic dentistry

Speech is essential to human life, but speech often may be taken for granted. Speech adaptation after prosthetic restoration is based on a very complex interaction of articulatory, myofunctional and psychosocial factors. An understanding of the basic phonetic principles may help clinicians solve phonetic problems during prosthodontic treatment. The purpose of this study is to illustrate phonetic features of German and to identify speech problems, which may develop in patients with dentures, as well as general approaches to evaluate and alleviate these problems.

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