[Aggressive fibromatosis in the jaw and facial region with bone involvement. A review]. / Aggressive Fibromatose im Kiefer-Gesichts-Bereich mit ossärer Beteiligung. Eine Ubersicht.

BACKGROUND: Aggressive fibromatosis (AF) involving bones of the head is rare and surgery is often complicated by a high recurrence rate. Interdisciplinary treatment is of the utmost importance to avoid extensive, mutilating resection. Two cases emphasize the difficulties in the management. CASE REPORTS: A 67-year-old woman was referred to our unit with a blepharochalasis of the left upper palpebra and a palsy of the face on the left side. Her medical history included 12 operations over the previous 4 years for an extensive AF. MATERIAL AND METHODS: Our review includes all case reports of AF involving bones of the head published between 1960 and 2004. Additionally, our two cases are presented. Signs, symptoms and outcome were analyzed in relation to different treatment options. CONCLUSION: According to the literature, surgery is the most common treatment for AF in the head and neck region. Alternative modes of therapy must be considered because of the high recurrence rate and to avoid mutilating operations.

[Peri-implant bone formation around cylindrical and conical implant systems]. / Tierexperimentelle Evaluation des periimplantären Knochens bei zylindrischen gegenüber konischen Implantattypen.

BACKGROUND: The treatment of patients with early or immediately loaded dental implants has renewed interest in the behavior of osseointegration at the implant surface. Whereas it is generally accepted that peri-implant tissue formation and mineralization are dependent on the local mechanical environment in the interface zone, controversies exist concerning the impact of implant design on peri-implant bone formation. The aim of the present study was the in vivo evaluation of peri-implant bone formation by two different implant systems: cylindrical (ITI) versus conical (ILI). MATERIAL AND METHOD: A total of 60 implants (30 ITI and 30 ILI) were placed in the cranial and caudal part of the tibia of eight Göttinger minipigs. Half of the minipigs were sacrificed at 7 days and 28 days of osseointegration. Implant-containing bone specimens were prepared for histological and ultrastructural investigations. RESULTS: Histological and scanning electron-microscopic investigations showed a direct contact of bone-like minerals over the whole implant surface from day 7 of implant/bone interaction. Whereas the ILI implant showed direct contact up to the top of the crestal bone, ITI implants demonstrated a crestally located narrow gap without ossification over the whole experimental period. CONCLUSION: Our investigations support the hypothesis of an implant design-inherent emergence and maintenance of crestal bone.

[Experimental and clinical study of the stability of an osteosynthesis plate for the atrophic mandible]. / Experimentelle und klinische Studie zur Stabilität einer Osteosyntheseplatte für den atrophen Unterkiefer.

BACKGROUND: The high rate of complications led us to develop a new osteosynthesis plate for the treatment of the fractured atrophied mandible. The development of the new so-called pencil-bone plate is based on the 2.0 mini-plate system manufactured by the Medartis Company. MATERIAL AND METHODS: Finite elements (FE) analysis of the new plate as well as flexibility experiments were undertaken, and 14 patients with 16 fractures of the atrophied mandible were treated with the pencil-bone plate between October 2000 and November 2001. RESULTS: The results clearly show that the pencil-bone plate reacted in both the FE model and the static flexibility experiment in a more stable way than a standard 2.0 plate. In 13 patients, healing proceeded without serious complications; all of the patients showed subjective, nearly unchanged chewing, speaking, and swallowing abilities and no complications occurred when wearing dentures. One patient underwent surgical intervention after a new trauma. CONCLUSION: The clinical outcome of the treated fractures confirmed the experimental results, which proved the high stability of the plate in the area of the fracture site. Due to the mini-plate format the intraoral application of the plate is possible without problems. The intraoral access allows rapid operation followed by a minimum of morbidity. A great advantage of the small dimension system is the unrestricted wearing of dentures after the application.

[Types of changes in laboratory technics used in prosthetic technology]. / Modaliteti izmjena u tehnolosko protetskom laboratorijskom postupku.

Because of the phenomena which were noticed in clinical and laboratory work of permanent stomatological metallographical and other researches of the consequences of free changed conditions in melting and cooling phase of dental alloy auropal were carried out. Modality of the changes during melting of this alloy in dental laboratory were systematically chosen according to noticed phenomena in praxis. Main objective was to metallographicly determine these phenomena during the process. With application of usual methods for setting of metallographical carved pie, samples were researched with metallographical microscope Epiryp 2 from Zeiss-jena, under different melting conditions and filmed with different enlargement. Even small changes of melting and cooling conditions are causing in microstructure and these are reflecting on the alloy characteristics. According to this melting procedure is a very sensitive and complex problem in termical laboratory processing which demands maximum attention an strict following fabrical instructions in order to avoid unwanted consequences in clinical application.

[Selection of the method of surgical approach in plate osteosynthesis of mandibular fractures]. / A mütéti feltárás megválasztása állkapocstörések lemezes oszteoszintézisekor.

BACKGROUND: Plateosteosynthesis by intraoral approach of mandibular fractures gives the best cosmetical result but presents a rather difficult procedure. AIMS: Comparison of intra- versus extraoral approach in plateosteosynthesis of mandibular fractures. METHODS: Plate type, experience of the surgeon, age and sex of the patient, as well as hospital stay and rate of the septic complications were analysed retrospectively in 248 patients of the OMF Department (University Freiburg) with mandibular fractures with respect in view of the operative approach used. RESULTS: The method of osteosynthesis was found to be the strongest determinant. Concerning the surgical approach significant correlation was found between age and sex, and surgical experience. Operative approach was found to have no effect on hospitalization and septic complications. CONCLUSION: Operative approach does not have either medical nor economical consequences in the surgical management of mandibula fractures.