Research

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ORIGINAL STUDY
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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Issue: 01/2012 - P.W. K√§mmerer - E. Stender - S. Telkes - E. Schiegnitz - F.G. Draenert
Morphological evaluation of circular osteotomies by two different
trephine bur systems in vitro

Introduction: The harvesting of bone grafts with trephine burs plays an important role in oral and maxillofacial surgery. The integrity of the bone graft and the local donor site should be preserved as much as possible. The aim of this study was therefore a comparative in vitro study of the bone donor site after cylindrical osteotomy with a standard trephine and a diamond hollow drill.

Material and Methods: Bovine pelvic bone was drilled using a standard trephine and a diamond hollow drill at different rotational speeds (20, 40, 60, 80, 100%). Impressions of the drill holes were prepared and the bone samples were processed for histomorphometrical analysis.

Results: In this study the diamond hollow drill demonstrated a better quality of the drill hole and gentler bone removal with fewer artifacts in both the impressions and the histological studies.

Conclusion: For gentle and atraumatic bone graft harvesting, the diamond hollow drill shows advantages compared with the standard trephine.

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Issue: 01/2012 - Ph. Streckbein - H. Eymer - F.A.Preusse - F.E. Preusse
Sinus lift and simultaneous insertion of dental implants
with a residual bone height less than 5 mm

Introduction: Sinus lift with simultaneous placement of dental implants is commonly performed on residual maxillary sinus floors with more than 5mm vertical height. There is a risk of implant failure in situations with less residual bone (5mm) due to initial mobility during healing.

Objectives: The aim of this retrospective study is to present the surgical procedure of simultaneous sinus lift and implant placement in a sandwich technique in patients with less than 5mm residual vertical bone height and to assess the risk of implant failure.

Material and methods: In the period between 1998 and 2005 39 patients underwent 55 sinus lift procedures with simultaneous placement of 78 dental implants (Semados S and RI implants, BEGO Implant Systems GmbH Co. KG, Bremen, Germany) in residual maxillary sinus floors below 5mm. To increase primary stability, additional lateral bone condensation was performed with osteotomes. The subantral space was filled with bone substitutes. Autogenous bone enriched with platelet-rich plasma (PRP) was applied through the implant cavity next to the implant site. Finally a PRP wetted implant was placed. Clinical examination and follow-up x-rays were performed in 2010.

Results: After exposure, 75 of 78 implants withstood a torque of 30Ncm, which equates to an initial survival rate of 96.2%. One patient with one implant was lost to follow-

up and another two implants had to be removed due to bisphosphonate-related osteonecrosis. All other implants were bland in situ and satisfactorily integrated in the prosthetic reconstruction. This leads to a survival rate of 92.3% after a follow-up of up to 12 years (median 8 years, mean 8.12 years; n = 78).

Conclusion: This study shows that simultaneous insertion of dental implants and augmentation in the vertically reduced sinus floor following the described surgical protocol leads to predictable and good results. The simultaneous approach allows considerable acceleration of the implant treatment and spares the patient a further surgical procedure, thus reducing the cost of treatment.

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