Swiss dental journal最新文献

Orthodontic appliances with brackets make oral hygiene more difficult, which leads to a significantly increased risk of caries and gingivitis if mechanical plaque control is inadequate over a longer period of time. While classic oral hygiene indices are aimed at smooth surfaces and approximal spaces, there are now modifications in the context of orthodontically treated teeth with brackets.

Lymphomas are malignant neoplasms of mature and immature B-cells, T-cells or NK-cells at various stages of differentiation. They predominantly occur in lymphoid tissues, manifestations in the oral cavity are rare: 3.5% of all oral malignancies are lymphomas. They often present an indolent course without systemic symptoms. Therefore, an early diagnosis by the dentist is important. We present a case of a mantle cell lymphoma in the oral cavity of an 80-year-old woman as a painless swelling of the buccal mucosa which represents the first sign of the disease. The oral biopsy, histologic and immunohistochemical diagnosis, further examinations and oncologic treatments are shown. Important clinical differential diagnoses are discussed.

Automotive mechanics are exposed to an increased risk for occupational injuries (OI) to the hands, arms, head and teeth. The aim of this study was to assess the self-reported prevalence of OIs to the head, including traumatic dental injuries (TDIs), among automotive repair and maintenance workers dealing with motorcycles, cars and vehicles over 3.5 tons. We surveyed healthy mechanics in Swiss automotive repair workshops from 2019 to 2021. Overall, 121 automotive repair and maintenance workers responded to our 12-item questionnaire concerning their professional experience, protective measures and occupational injuries to the head and teeth (response rate: 12%). 119 were considered eligible for inclusion and two were excluded. Most persons surveyed (94%) were males with more than 10 years of professional experience. Eighty-five (72%) reported occupational injuries in general, 37 (43.5%) specified OIs to the head or tooth area, and 16 stipulated that these cases teeth were affected. The most common self-reported diagnosis was tooth fracture (p=0.191). Traumatic dental injury in childhood increased the odds ratio (OR) for occupational injury to the head or teeth by a factor of 2.4 (95% CI: 1.1, 5.5, p=0.036). Age, gender and dental trauma in childhood may also influence the prevalence of occupational injuries in general in this cohort. We conclude that occupational dental accidents in automotive repair workshops can be reduced by raising awareness of this issue and by taking effective preventive measures.

A 69-year-old woman consulted the Oral surgery and implantology unit of the Geneva University Hospitals with the chief complaint of chewing difficulties, aesthetic discomfort and dry mouth. The wish of the patient was to receive a reliable fixed solution in the long term. The patient had chronic nonspecific sialadenitis accompanied by xerostomia. She wore a total prosthesis stabilized on two inter-foraminal implants and had multiple cavities of the remaining maxillary teeth. The goals of treatment were to improve masticatory function with fixed prosthetic rehabilitation on upper and lower implants. With a post-extraction alveolar ridge preservation technique, the placement of Straumann® maxillary implants could be performed with a basic sequence without bone augmentation which reduced morbidity, treatment time and costs compared to reconstruction of the edentulous and atrophied mandible. The patient was very satisfied at the follow-up at 3 and 6 months as well as at 1 and 2 years, and the restorations were stable. In summary, the post-extraction preservation of the alveolar ridges is a predictable therapeutic option that can be considered in a context of multiple extraction in order to limit the complexity of the implant treatment.

This case series retrospectively investigated the one-year surgical outcome of regenerative peri-implantitis therapy using a hydroxyapatite (HA) bone substitute material in combination with enamel matrix derivate (EMD) and collagen membrane for guided bone regeneration (GBR). Data-sheets of patients were screened to detect patients who received identical regenerative peri implantitis-therapy with surface decontamination and GBR applying HA, EMD and a collagen membrane under broad- spectrum antibiotic regime. For inclusion, information on pre- and postoperative clinical and radiographic parameters (probing pocket depth (PPD), bleeding on probing (BOP), suppuration (SUPP) and the radiological bone level (RBL)) had to be available for statistical analysis. Data of a total of 11 patients (20 implants) were extracted out of 202 (336). All implants were still in function after one year. Bone defects decreased by an average of 1.3 mm mesially and 0.9 mm distally, respectively. Mean PPD was reduced from 4.9 mm to 2.7 mm. BOP decreased from 90% to 20%. Suppuration decreased from 65% to 0%. Based on the success criteria applied, 15 of the 20 (75%) implants included were considered as successfully treated after 1 year. Regenerative peri-implantitis therapy according to the presented concept showed promising clinical and radiographic outcomes after one year. To estimate the beneficial effects of the combined use of HA, EMD and collagen membranes, further long term investigations with a control group are needed.

Self-adhesive composites promise simplified application and reliable adhesion to dental hard tissues without prior conditioning or application of an adhesive system. Their working principle is based on specific functional monomers. Although they may reach acceptable sealing capability in minimally invasive cavities, study results showed significantly reduced bond strength to enamel and dentin compared to conventional adhesive systems. Thus, the use of self-adhesive composites requires critical individual consideration.

The brown tumour (osteitis fibrosa cystica) is a rare, non-neoplastic, expansively growing lesion containing giant cells. Hyperparathyroidism (hyperparathyroidism [HPT]) leads to the development of a brown tumour in 2 to 3 percent of cases. This can manifest itself in any part of the skeleton.

Students, who may begin their dental education with sub-optimal oral self-care practices, are taught they should motivate patients to clean interdentally and reduce/stop smoking. To better understand their internalization of these concepts, students were surveyed at two distinct time points. Student cohorts from four Swiss universities were asked to complete an interdental cleaning/smoking habit questionnaire at the beginning of their pre-clinical education (n = 110) and again a year later, when beginning treatment of patients (n = 115). A local cohort (n = 28) was observed for comparison. All subjects participated voluntarily and anonymously. Interdental cleaning ≥ 3 times per week was performed by 48% first-year and 43% secondyear students in Basel, 60% and 76% in Bern, 60% and 70% in Geneva, 41% and 49% in Zurich, and 29% in the local cohort. Logistic regression using gender, class year and school as explanatory variables showed gender (p < 0.001) and school (p = 0.018) influenced cleaning frequency, with the odds being 3.16 [95% CI: 1.76, 5.67] times higher for females to perform interdental cleaning ≥ 3 times per week. Smoking was reported both years in numbers too low to analyze. Approximately 29% of the local cohort and 52% of the first-year students displayed an interdental cleaning frequency congruent with oral health recommendations. Adequate cleaning frequency increased for second-year students to 58%, which was not significant. Further study is needed to determine why more dental students do not themselves clean interdentally.

One of the most frequent pathologies of jaw bone is a bacteria-induced inflammation at the apices of teeth with subsequent bone resorption that typically presents as a radiolucency in radiographs. Usually, corresponding clinical and radiographic findings correlate and allow for an accurate diagnosis. However, occasionally an unexpected and completely different diagnosis presents as documented in this case report. In a 55-year-old female patient, a radicular cyst was suspected in her right maxillary bone. The treatment plan included a cystectomy as well as apical surgery of the adjacent and root-canal filled teeth 15 and 16. However, the intraoperative finding absolutely did not fit a radicular cyst but rather a mucous retention cyst, as could be confirmed subsequently by histopathology. The diagnosis of a mucous retention cyst within the jaw bone is extraordinary and as such has never been described before in the literature.

Over the last years, bioactive glass particles have been successfully incorporated in dental restorative materials. Remineralizing effects on dental hard tissue and antibacterial properties are promising properties of these customized composites. A few materials doped with bioactive fillers are already available on the dental market. Nevertheless, further research is required to fine-tune bioactive composites for biomimetic restorative approaches.