Pathohistologische Varianten des Befundes Epithel bei 150 Osteotomien unterer Weisheitszähne

Background

The aim of the study was to classify epithelial structures (ES) and to determine the prevalence of cysts associated with mandibular third molars (M₃).

Material and method

Sections of HE-stained soft tissue specimens and panoramic radiographs of 150 consecutive patients undergoing surgical removal of M₃ were evaluated. ES were classified as islands and/or strands of odontogenic epithelium (OE), reduced enamel epithelium (REE), stratified cyst epithelium (SCE), oral mucosa (OM), and pocket epithelium (PE). The diagnostic criteria were defined as a pericoronal translucency >2.5 mm and SCE for dentigerous cysts (DC) and a distal translucency >2.5 mm, SCE, and inflammation for inflammatory paradental cysts (IPC).

Results

Median age was 24.4 years: 23.0 years for 86 (57.3%) female patients and 25.7 years for 64 (42.7%) male patients (p=0.017). ES were found in 95.3%, classified as OE in 53.3%, REE in 34.7%, SCE in 28%, OM in 30.7%, and PE in 10.7%. Both REE and SCE were found in 6%. The total number of cases with REE and/or SCE was 56.7%. Median age of cases with SCE was 28.7 years compared to 20.7 years in cases with REE (p<0.001). Pericoronal translucencies were found in four M₃, of which three were associated with SCE. Distal translucencies were found in 47 M₃, of which 15 were associated with SCE and inflammation. The prevalence was 2% for DC and 10% for IPC.

Conclusions

A differentiated application of histological and radiological criteria enables the prevalence of cystic lesions to be more accurately determined than does the use of one criterion alone.     

Zwillingszähne

Ohne ZusammenfassungMit 13 Abbildungen     

Risse und Frakturen der Zähne

Background

Fractured teeth can be a special challenge for conservative therapy or are scheduled immediately for extraction. Often these teeth have experienced a number of treatments, e.g. fillings, root canal or post preparations which have all contributed to a weakening of the remaining tooth structure. Sometimes the reason for tooth fracture is not so obvious and can also affect vital teeth that were initially considered to be intact. These often show cracks in the enamel which can, however, with progressive expansion lead to bigger problems.

Methods

The clinical aspects of the reasons for cracked or fractured teeth can be divided in natural, acquired and iatrogenic factors. In order to find an adequate and timely treatment in terms of crowns or adhesive restoration, a thorough diagnosis and knowledge of the origin, nature and spread of tooth cracks are essential. This article explains the current results and therapeutic approaches.     

Die operative Umschlingung retinierter Zähne

Zusammenfassung Es wird eine neue Methode zur einzeitigen Anlegung einer Zahnhalsligatur mit zwei Zügeln um die Krone retinierter Zähne beschrieben und über Erfahrungen anhand einer Gruppe von 70 Fällen berichtet.Herrn Professor Dr. Dr. Gustav Korkhaus zum 70. Geburtstag gewidmetMit 22 Abbildungen     

Beobachtungen von Fällen überzähliger Zähne

Ohne ZusammenfassungMit 10 Abbildungen     

Die Bedeutung parafunktioneller Vorgänge für die Kieferorthopädie

Ohne Zusammenfassung