Osteochondroma of the condyle: case report with 15 years of follow-up.

Osteochondromas (OC) in the craniofacial region are very rare. Following on from a literature review published in 2011, further single case reports and case series are reviewed herein. To date, approximately 235 studies on OC of the mandibular condyle have been published in the English language literature. There is debate regarding the surgical techniques for treatment. Whereas the use of condylectomy has shown no recurrences, follow-up of conservative excision of the tumour has shown recurrence in three cases. One of these relates to the case presented here, which was first reported in 2002. The patient has declined any further surgery since that date. The tumour has shown no further growth and there is no functional impairment. This underlines Cottrell's claim that excision of the entire cartilage cap appears to stop the growth of the tumour and represents the most important focus of surgical treatment.

[On the interdisciplinary S3 guidelines for the treatment of chronic idiopathic tinnitus]. / Zur interdisziplinären S3-Leitlinie für die Therapie des chronisch-idiopathischen Tinnitus.

INTRODUCTION: Tinnitus is a frequent symptom, which, particularly in combination with comorbidities, can result in a severe disease-related burden. Chronic idiopathic tinnitus (CIT) is the most frequent type of tinnitus. A considerable number of treatment strategies are used to treat CIT-for many of which there is no evidence of efficacy. In order to enable scientific evidence-based treatment of CIT, German interdisciplinary S3 guidelines have recently been constructed for the first time. Here we present a short form of these S3 guidelines. MATERIALS AND METHODS: The guidelines were constructed based on a meta-analysis of the treatment of chronic tinnitus performed by the authors. Additionally, a systematic literature search was performed in the PubMed and Cochrane Library databases. Furthermore, a systematic search for international guidelines was performed in Google, as well as in the Guidelines International Network and National Guideline Clearinghouse (USA) database. Evidence was classified according to the Oxford Centre for Evidence-Based Medicine system. RESULTS: According to the guidelines, alongside counselling, manualized structured tinnitus-specific cognitive behavioral therapy (tCBT) with a validated treatment manual is available as evidence-based therapy. In addition, the guidelines recommend concurrent treatment of comorbidities, including drug-based treatment, where appropriate. Particularly important is treatment of anxiety and depression. Where a psychic or psychiatric comorbidity is suspected, further diagnosis and treatment should be performed by an appropriately qualified specialist (psychiatrist, neurologist, psychosomatic medicine consultant) or psychological psychotherapist. In cases accompanied by deafness or hearing loss bordering on deafness, cochlear implants may be indicated. CONCLUSION: No recommendations can be made for drug-based treatment of CIT, audiotherapy, transcranial magnetic or electrical stimulation, specific forms of acoustic stimulation or music therapy; or such recommendations must remain open due to the lack of available evidence. Polypragmatic tinnitus treatment with therapeutic strategies for which there is no evidence of efficacy from controlled studies is to be refused.

MRI with intraoral orthodontic appliance-a comparative in vitro and in vivo study of image artefacts at 1.5 T.

OBJECTIVES: We investigated artefacts caused from orthodontic appliances at 1.5-T MRI of the head and neck region and whether the image quality can be improved utilizing the artefact-minimizing sequence WARP. METHODS: In vitro tests were performed by phantom measurements of different orthodontic devices applying different types of MR sequences [echoplanar imaging (EPI), turbo spin echo (TSE) and TSE-WARP, gradient echo (GRE)]. Two independent readers determined after calibration the level of artefacts. Subsequently, the interobserver agreement was calculated. The measurement of artefacts was based on the American Society for Testing Materials Standard F 2119-07. For in vivo imaging, one test person was scanned with an inserted multibracket appliance. The level of artefacts for 27 target regions was evaluated. RESULTS: In vitro: ceramic brackets and ferromagnetic steel brackets produced artefact radii up to 1.12 and 7.40 cm, respectively. WARP reduced these artefacts by an average of 32.7%. The Bland-Altman-Plot indicated that maximum measurement differences of 3 mm have to be expected with two calibrated observers. In vivo: the EPI sequence for brain imaging was not analysable. The TSE sequence of the brain did not demonstrate artefacts except for the nasal cavity. Conversely, the TSE sequence of the cervical spine revealed severe artefacts in the midface region. The GRE sequence appeared to be more susceptible to artefacts than did the TSE sequence. CONCLUSIONS: In vitro measurements allow an estimation of the in vivo artefact size. Orthodontic appliances may often remain intraorally when performing MRI. WARP showed a more significant effect in vitro than in vivo.

Frequency, severity and predictors of playing-related musculoskeletal pain in professional orchestral musicians in Germany.

Playing-related musculoskeletal disorders (PRMD) in professional musicians are common. Existing literature demonstrates that up to 86 % of musicians are affected. The aim of the study was to evaluate the frequency of musculoskeletal pain in professional orchestral musicians with regard to their instrument affiliation. Of special interest were pain intensity and its association with predictors such as gender, instrument group, age or stage fright. Professional orchestra players completed a self-report questionnaire to assess playing-related musculoskeletal pain and its frequency and intensity in various body regions on a numeric rating scale (NRS). Relative frequencies and prevalence ratios for different instrument groups were estimated. Out of 720 approached musicians, 408 were included in the sample (response rate 57 %); overall, 89.5 % had been affected by current or past playing-related musculoskeletal pain, 62.7 % reported pain in the previous 3 months, and 8.6 % reported current pain. Pain distribution and frequency varied between instrument groups. For all instrument groups, the neck was the most common pain region. About 43 % of musicians presented more than five pain regions, in particular violin players. Approximately 40 % of musicians indicated frequent or permanent pain. Average pain intensities increased from NRS 3.8 up to a range of 5.9 and 7.4 for frequent and permanent pain, respectively. Female gender and stage fright were proven to be predictors for musculoskeletal pain. Professional orchestral musicians are greatly affected by PRMD, often experiencing frequent or permanent pain, high pain levels and pain in various body regions. As PRMD might contribute considerably to performance disability, sick leave and the possibility of premature termination of a musicians' career, this study highlights the necessity for tailored therapeutic and preventive strategies in performing arts medicine.

Symptoms of craniomandibular dysfunction in professional orchestra musicians.

BACKGROUND: Up to 80% of professional musicians are affected by playing-related musculoskeletal disorders, but data regarding the frequency of craniomandibular dysfunction (CMD) in professional orchestra musicians is scarce. AIMS: To evaluate the frequency of CMD and its relation to musculoskeletal pain in various body regions. METHODS: A questionnaire-based survey approach assessing CMD symptoms and musculoskeletal pain in professional orchestra players was adopted. Relative prevalence rates and prevalence ratios for different instrument groups were estimated. RESULTS: A total of 408 musicians completed the questionnaire (response rate 57%). Playing-related pain in the teeth or jaw was reported by 19-47% of musicians and TMJ pain by 15-34%, depending on the instrument group. Current pain in the face indicating a painful CMD was reported in 6-10% and related symptoms such as teeth grinding in 25-34%, jaw clenching in 33-42% and jaw locking in 11-18% of musicians. Females were 2.4 times (95% confidence intervals (CI) 1.49-3.84) more likely to report having had orofacial pain within the last month. Musicians reporting orofacial pain within the last month were 4.8 times (95% CI: 2.83-8.02) more likely to report pain in the neck and 2.5-3.8 times (P < 0.05) more likely to report pain in other body regions, including shoulders, right wrist, left fingers and the thoracic and lumbar spine. CONCLUSIONS: Symptoms suggesting CMD were common in this study of professional orchestra musicians and were associated with pain in the neck, shoulder and hands. There is a need to enhance awareness of CMD to optimize early medical diagnosis and treatment.

The impact of self-perceived masticatory function on nutrition and gastrointestinal complaints in the elderly.

OBJECTIVES: Impaired masticatory function is generally considered to be a contributing factor in the development of malnutrition (1, 2). Furthermore, the exclusion of essential and high-fibre foods from the subjects' diets, due to chewing problems, may induce gastrointestinal disorders (3-5). OBJECTIVE: The impact of masticatory function on malnutrition and gastrointestinal symptoms was evaluated. DESIGN, SETTING, AND PARTICIPANTS: This prospective cross-sectional study was conducted in four nursing homes in Berlin, Germany. 119 residents (mean 86, ± 8.0 years, 62-102) took part in the study. MEASUREMENTS: Dental status, denture quality, prosthetic condition as well as masticatory ability and gastrointestinal symptoms were evaluated by clinical examination or interview. Nutritional state was determined according to Mini Nutritional Assessment (MNA). RESULTS: The mean Body Mass Index was 24.4, ±4.9 kg/m² (17% < 20 kg/m²). The mean MNA was 22.5, ±4.3, 51.3% below normal. 54.5% of the dentures were poorly fitting. No significant relationships were found between the MNA and dental parameters except loose fit of dentures. However, there was significantly more food avoidance among the subjects with stated chewing problems, discomfort with dentures or ill-fitting dentures and there were significantly more digestive complaints among this group. CONCLUSIONS: Impairments of masticatory function may lead to food avoidance and to a higher incidence of digestive complaints.

[Influence on flux density of intraoral dental magnets during 1.5 and 3.0 tesla MRI]. / Beeinflussung der Flussdichte intraoraler Dentalmagnete im 1,5 und 3 Tesla-MRT.

PURPOSE: When using dental duo-magnet systems, a mini-magnet remains in the jaw after removal of the prosthesis. In some cases, implant-borne magnets may be removed, whereas tooth-borne magnets are irreversibly fixed on a natural tooth root. The goal of this paper is to identify the impacts of the duration and orientation of exposure on these magnets in a 1.5 or 3 Tesla MRI. MATERIALS AND METHODS: For this study, 30 SmCo and 60 NdFeB magnets were used. During the first experiment, they were exposed with free orientation for 64 minutes. During the second experiment, the magnets were fixed in position and exposed at 1.5 and 3 Tesla while aligned in a parallel or antiparallel direction. RESULTS: While the duration of exposure in MRI is irrelevant, the orientation is not. The coercive field strength of these NdFeB and SmCo alloys is not sufficient to reliably withstand demagnetization in a 1.5 or 3 T MRI when aligned in an antiparallel direction. At 1.5 T neodymium magnets were reduced to approx. 34 % and samarium magnets to approx. 92 % of their initial values. At 3 T all magnets were reversed. CONCLUSION: As a precaution, the worst-case scenario, i. e. an antiparallel orientation, should be assumed when using a duo-magnet system. If an MRI can be postponed, the general dentist should remove implant-borne magnets. If there is a vital indication, irreversible damage to the magnets is acceptable in consultation with the patient since the replacement costs are irrelevant given the underlying disease.

[Are denture cleansing tablets suitable for daily use?]. / Sind Reinigungstabletten für die alltägliche Zahnprothesenhygiene geeignet?

Sufficient denture hygiene is very important in particular for immunocompromised and bedridden patients to reduce the risk posed by the aspiration of pathogenic microorganisms. In addition to mechanical cleansing, chemical denture cleansers are suitable for daily use at home. However, they continue to be seen as problematic because they are said to damage the denture material. These prejudices are based on studies of products with highly alkaline pH values, which in addition contain strong bleaching agents, e.g., hypochlorite. In Germany, denture cleansing tablets available over the counter belong to the group of neutral or weakly alkaline peroxides and are much less aggressive, which is why no side effects are reported from accidental ingestion. In vitro studies show that nursing staff can significantly contribute to denture hygiene by regularly applying the easy-to-use method of chemical cleansing. In particular as regards the residents of care facilities, it reasonably supplements mechanical cleansing without damaging the dentures.

Potential of information technology in dental education.

The use of information technology (IT) in dentistry is far ranging. In order to produce a working document for the dental educator, this paper focuses on those methods where IT can assist in the education and competence development of dental students and dentists (e.g. e-learning, distance learning, simulations and computer-based assessment). Web pages and other information-gathering devices have become an essential part of our daily life, as they provide extensive information on all aspects of our society. This is mirrored in dental education where there are many different tools available, as listed in this report. IT offers added value to traditional teaching methods and examples are provided. In spite of the continuing debate on the learning effectiveness of e-learning applications, students request such approaches as an adjunct to the traditional delivery of learning materials. Faculty require support to enable them to effectively use the technology to the benefit of their students. This support should be provided by the institution and it is suggested that, where possible, institutions should appoint an e-learning champion with good interpersonal skills to support and encourage faculty change. From a global prospective, all students and faculty should have access to e-learning tools. This report encourages open access to e-learning material, platforms and programs. The quality of such learning materials must have well defined learning objectives and involve peer review to ensure content validity, accuracy, currency, the use of evidence-based data and the use of best practices. To ensure that the developers' intellectual rights are protected, the original content needs to be secure from unauthorized changes. Strategies and recommendations on how to improve the quality of e-learning are outlined. In the area of assessment, traditional examination schemes can be enriched by IT, whilst the Internet can provide many innovative approaches. Future trends in IT will evolve around improved uptake and access facilitated by the technology (hardware and software). The use of Web 2.0 shows considerable promise and this may have implications on a global level. For example, the one-laptop-per-child project is the best example of what Web 2.0 can do: minimal use of hardware to maximize use of the Internet structure. In essence, simple technology can overcome many of the barriers to learning. IT will always remain exciting, as it is always changing and the users, whether dental students, educators or patients are like chameleons adapting to the ever-changing landscape.

[Chronic tinnitus and craniomandibular disorders. Effectiveness of functional therapy on perceived tinnitus distress]. / Chronischer Tinnitus und kraniomandibuläre Dysfunktionen. Einfluss funktionstherapeutischer Massnahmen auf die Tinnitusbelastung.

BACKGROUND: Whether the co-occurrence of signs and symptoms of a craniomandibular disorder (CMD) and chronic tinnitus are coincidental or causal is controversial. Therefore, the effects of splint therapy and self-therapy on perceived tinnitus were evaluated. PATIENTS AND METHODS: Fifty-nine patients with chronic tinnitus were divided into three groups. In a cross-over design, two groups received the two different treatments and were compared with a control group. All patients received the initial basic tinnitus therapy. RESULTS: No significant correlation was established between the groups receiving treatment and the control group that would validate a link between tinnitus and CMD. CONCLUSION: The results of this study suggest a coincidental relationship between the two complexes of symptoms.

[Stress, coping, and craniomandibular disorders]. / Stress, Stressverarbeitung und kraniomandibuläre Dysfunktionen.

BACKGROUND: Stress is an etiologic factor of pain-relevant craniomandibular disorders (CMD). Interindividual differences in coping with stress and their relation to CMD have rarely been examined. PATIENTS AND METHODS: A total of 72 volunteers (20 men, 52 women) were examined according to the Research Diagnostic Criteria for Temporomandibular Disorders. Stress parameters and coping skills were assessed by questionnaires. RESULTS: Stress and one coping factor are correlated with CMD indices. Linear regression analysis found the Life Event Score and cognitive coping by changing appraisals to significantly predict CMD. CONCLUSION: Stress and coping skills are independent predictors of CMD.

[Morphometric analysis of the temporomandibular joint with MRI in 320 joints]. / Morphometrische Analyse des Kiefergelenkes anhand von 320 Gelenken mit der MRT.

PURPOSE: To compare several morphometric parameters in MRI with the functional status of the articular disc in a large patient group suffering from internal derangement (ID) of the temporomandibular joint (TMJ). MATERIALS AND METHODS: In a retrospective study, 320 analyzable high resolution MRI examinations of the TMJs obtained in a 1.5 T unit were evaluated in 184 patients with clinically suspected ID. The analysis included the anatomical structures and a number of morphometric parameters previously described in the literature. The parameters were compared with the position of the articular disc. RESULTS: The disc position was categorized as "normal" (NDP, 21.9 %, n = 70), "anterior displacement with reduction on opening" (AMR, 51.6 %, n = 165) and "anterior displacement without reduction on opening" (AOR, 26.6 %, n = 85). With increasing disc displacement, significant configurational changes of the disc were observed. Disc displacement was associated with changes of the condyle consisting of increasing deformity and other degenerative changes. A large tuberculum and marked inclination of the eminence can be seen as predisposition for the development of ID. With increasing severity of the ID, the position of the condyle moved from a centric position of the condylar center to an excentric (dorsal and cranial) position. CONCLUSION: MRI demonstrated that increasing disc displacement is associated with changes of the disc, condyles and condylar position in the fossa.

Dentocase - open-source education management system in dentistry.

Since 2001, an interdisciplinary project on multimedia education in medicine has been sponsored by the Federal Ministry of Education and Research at the Charité. One part of the project is on dentistry. In the light of the results of a survey of dental students, an Internet-based education management system was created using open-source back-end systems. It supports four didactic levels for editing documentation of patient treatments. Each level corresponds to the learning abilities of the students. The patient documentation is organized to simulate the working methods of a physician or dentist. The system was tested for the first time by students in the summer semester of 2003 and has been used since the winter semester of 2003 as part of the curriculum.

[Dysfunctions of the stomatognathic system in tinnitus patients compared to controls]. / Funktionsstörungen des Kauorgans bei Tinnituspatienten im Vergleich zu einer Kontrollgruppe.

AIMS OF THE STUDY: The high prevalence of ear, nose and throat symptoms in patients with temporomandibular disorders seems to depend on anatomical, functional, neuromuscular, or psychosomatic connections between both phenomena. The present study evaluates the prevalence of temporomandibular dysfunctions in tinnitus patients compared to controls. PATIENTS AND METHODS: A total of 40 patients and 35 controls were clinically examined. The case history as well as the quality of tinnitus and its influence on the patient's life were evaluated, and psychosocial data collected by a questionnaire dealing with stress factors. RESULTS: Tinnitus patients showed muscle tenderness in masticatory muscles as well as in other muscle groups significantly more frequently than controls. The prevalence of arthrogenous dysfunctions was not significantly different between the groups. Occlusal parameters such as instability of intercuspidation, presence of dysgnathia, and signs of parafunctions were significantly more frequent in patients than in controls. The psychosocial assessment showed some trend towards the tinnitus patients feeling more stress in society, daily life, their partnerships and at work. CONCLUSIONS: Tinnitus correlates significantly with myogenous disorders but not with arthrogenous disorders of the temporomandibular joint (TMJ). This result supports the concept of neuromuscular and functional relationships between tinnitus and the stomatognathic system.

Osteochondroma of the mandibular condyle: a case report.

A case of osteochondroma of the right mandibular condyle in a 47-year-old woman is presented. Instead of condylectomy, surgical resection was performed, resulting in fewer functional changes and less dysfunction of the temporomandibular joint but recurrence within 12 months after surgery.

[Otalgia and tinnitus in patients with craniomandibular dysfunctions]. / Otalgie und Tinnitus bei Patienten mit kraniomandibulären Dysfunktionen.

AIMS OF THE STUDY: The high prevalence of ear, nose, and throat symptoms in patients with craniomandibular disorders seems to depend on the connection between both phenomena. The present study evaluates the connection between craniomandibular disorders (CMD) and otalgia or tinnitus, investigates the correlation between specific diagnoses of CMD with otalgia or tinnitus, and estimates the effects of treatment of CMD on these ear symptoms. PATIENTS AND METHODS: The information from case histories, clinical examinations, and treatment results of 221 patients with CMD were coded and evaluated by computer. All patients received conservative treatment with occlusal splints, training in self-observation of parafunction, massage of the masticatory muscles, and heat therapy. At least 1 year after the first examination, all patients were reevaluated. According to their complaints, the patients could be divided into three groups: (1) CMD patients without ear symptoms (n = 134 = 61%), (2) CMD patients with otalgia (n = 80 = 37%), and (3) CMD patients with tinnitus (n = 8 = 3.8%) (one patient with tinnitus and otalgia). RESULTS: Otalgia correlated significantly with CMD and the specific CMD diagnoses of anterior disk displacement (ADD) without reduction and osteoarthrosis. Of the reevaluated patients with otalgia, 90% had no ear pain and 10% reported reduced or less frequent ear pain. Only one of the eight cases with tinnitus noted reduced noises; the remaining seven perceived no influence on their ear noises from therapy. CONCLUSIONS: Due to the treatment results, otalgia has to be interpreted as a possible symptom of CMD and not as a separate diagnosis.

[Impression disinfection--clinical tests]. / Abdruckdesinfektion--klinisch erprobt.

In a series of tests was proved that the disinfection of impressions could be performed without significant dimensional changes of the impressions or loss of quality of the gypsum casts. There still exists, however, certain reservations among dentists and dental technicians to disinfect impressions routinely. Therefore the clinical effects of the disinfection of impressions have been tested. In total 248 impressions were tested, 138 were not disinfected, 110 were immersed for 15 minutes in a 2.5% solution of glutardialdehyd (Cidex). Lateron was controlled if the disinfection had an influence on the correct fitting of the fixed prosthodontics. As the result, the disinfection of impressions can be definitely excluded to be the course for incorrect fitting.

[Polymerization shrinkage of denture resins in different preparation procedures]. / Polymerisationsschrumpfung von Prothesenkunststoffen bei verschiedenen Herstellungsverfahren.

The Intention of this study was to examine and compare the effect of three different polymerization systems on the dimensional changes of denture-resin. The development of the fissure has been measured at five fixed points at the posterior border of upper complete dentures after a 4-weeks'-storage in water and saliva respectively. The perform-Inkovac-System showed the best, the SR-Ivocap-System the most unfavorable results; the conventional "stuff-press-system" gave only medium satisfaction.