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Background/Aim: To determine the prevalence of single-rooted mandibular second molars in a Greek population and examine their internal morphology with the aid of intraoral periapical radiography.

Material and Methods: Clinical records of 531 root-canal treated permanent single-rooted mandibular second molars were collected from the Postgraduate Clinic of the Department of Endodontology, Dental School, Aristotle University of Thessaloniki, Greece and from private dental clinics in the same city. The clinical records, along with the radiographic examination, were evaluated to determine the overall frequency of single-rooted mandibular second molars together with the number of root canals and their course. The root canals were categorized using Vertucci’s classification with the addition of 3 further types where appropriate.

Results: Out of 531 mandibular second molars; 102 (19.2%) presented a single root; 427 (80.4%) presented two roots; 2 (0.4%) presented three roots. In a total of 102 single-rooted mandibular second molars 31 (30.3%) presented with Type I, 18 (17.6%) with Type II, 14 (13.7%) with Type IV, 7 (7%) with 3 additional root canal types and 32 (31.4%) with a C-shaped root canal system.

Conclusions: One out five mandibular second molars was single-rooted in a Greek population. The internal morphology of these teeth can be very complex with regard to the numbers and courses of root canals.

Application of the ISSR method to estimate the genetic similarity of Dasypyrum villosum (L.) P. Candargy Greek populations to Triticum and Secale species

In the study, the genetic similarity between Dasypyrum villosum L. (P.) Candargy and Triticum L. and Secale L. species was studied on the basis of ISSR markers. As a very polymorphic, effective and reproducible method, ISSR can be successfully employed to evaluate polymorphism between and inside different species. The polymorphic information content values (PIC) of ISSR method ranged from 0.57 to 0.87, with the mean value of 0.7. The genetic similarity of the forms analyzed ranged from 0.27 to 0.97, with the mean value of 0.47, indicating their high diversity. A higher similarity of Dasypyrum villosum to Triticum species, in comparison with Secale was found - the mean Dice genetic similarity index between genera was calculated at 0.40 for Dasypyrum and Triticum, and at 0.31 for Dasypyrum and Secale.


The purpose of this study was to determine the range of certain skeletal structures and investigate their relationship and facial types in Greeks with normal occlusion. 123 lateral cephalometric radiographs obtained from 65 males and 58 females (mean age: 24 and 23 years respectively) with normal occlusion were studied at the Dental School of Aristotle University of Thessaloniki. Angles SNA, SNB, NL-NSL, ML-NSL, NSBa and ML-NL were measured and analysed.

Females presented significantly greater posterior inclination of the mandible (ML-NSL) and larger cranial deflection (NSBa) than males. Correspondence Analysis determined the relationships between the six variables and resulted in grouping the sample into 3 different facial types: (1) Type Α (Prognathic), characterised by high SNA and SNB values, anterior-upper inclination of the maxilla, anterior inclination of the mandible and small cranial deflection; (2) Type Β (Orthognathic), with intermediate values, which correspond to medium type of the normal range; and (3) Type C (Retrognathic), characterised by low SNA and SNB values, posterior inclination of both, the maxilla and the mandible, and high cranial deflection. These relationships were similar for both males and females.

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