Background / Aim. The biggest motivating factor for undertaking of orthodontic treatment is poor dental aesthetics, as a consequence of occlusal abnormalities. The aim of this study is to determine the need for orthodontic treatment on the basis of aesthetic componentsof IOTN index (the index of orthodontic treatment need), to compare the degree of aesthetic component of IOTN and subjective perception of individuals about their dental aesthetics, and to compare the evaluation of the aesthetic component of IOTN subject in comparison with evaluation of the therapist. Methods. The study was conducted on a sample of 316 students, age 15-19 years old, who were not in orthodontic treatment prior to the survey. The research was done by the usage of the index of orthodontic treatment need (IOTN)which consists of dental and aesthetic components on the basis of which the need for therapy is determined. The aesthetic component of the index was noted by the therapist (specialist of orthodontics), as well as subject himself. Results. According to grades of subjects the need for orthodontic treatment is present with 0.38 % of male subjects and 2.00 % of female subjects. According to evaluations of the therapists, the need for orthodontic treatment is present in 7.52 % of male subjects and 8.00% of female subjects. Observing all subjects , the need for orthodontic treatment is present in 0.63% of subjects, and according to the therapist the need for orthodontic treatment is present in 7.59% of subjects. The mentioned difference is statistically significant. Conclusion. Obtained results show that there is a significant difference about the dental aesthetics and the need for orthodontic treatment between the subjects and therapists. This can be a cause for concern, because patients who are not aware of their orthodontic abnormality can limit the need for further treatment.

Feline dental resorptive lesions affect more than one third of all adult domestic cats and continue to be an enigma in the veterinary dental science although different theories about the pathogenesis of these lesions have been proposed. Recently, a hypothesis was introduced that local mechanical trauma could be an important factor in the initiation of feline dental resorptive lesions and that there is a correlation between the occurrence of resorptive lesions and occlusal trauma in cats. The aim of this study was to analyse stress distribution in feline tooth during occlusal loading in order to accept or reject the hypothesis that dental resorptive lesions in cats might be caused by occlusal trauma. A solid model of feline tooth had to be created in order to perform the investigation. The idea was to gain data for tooth displacement (deformation) and stress and strain distribution under loading generally for any feline tooth using the finite element method. The results of the study contribute to the theory that occlusal overload might be one of the causes in multifactorial resorptive lesions in cats. Succession of tensile and compressive stresses and tooth displacement during occlusal loading might be a contributive factor in the pathogenesis of feline resorptive lesions. However, further research is required to confirm this statement

Background/Aim. Mandibular prognathism as one of the more severe forms of dentofacial deformities impairs the oral functions and appearance of the patient's face and represents a psychosocial handicap with a negative impact on their quality of life. This study aims was to assess the impact of orthodontic-surgical treatment on the quality of life of patients with mandibular prognathism. Methods. The study involved 40 patients (19 men and 21 women, mean age 24.1 ? 4.10) who underwent orthodontic-surgical treatment of mandibular prognathism. All patients completed two questionnaires, the Oral Health Impact Profile (OHIP-14) and the Orthognathic Quality of Life Questionnaire (OQLQ), before the start of treatment and 12 months after the completion of treatment. Results. Both questionnaires showed an improvement in the quality of life compared to the condition before the start of treatment. According to the OQLQ questionnaire, there was a postoperative improvement in quality of life (M = 24.83 ? 12.99) compared to the preoperative period (M = 51.28 ? 15.2). According to the OHIP questionnaire, there was a postoperative improvement in quality of life (M = 11.34 ? 2.99) compared to the preoperative period (M = 20.8 ? 6.88). The improvement of quality of life 12 months after treatment occurred in all segments measured by both questionnaires. Conclusion. Orthodontic-surgical treatment of mandibular prognathism improves all oral functions, the appearance of the patient's face, and thus improves the quality of life.

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Biomechanical experimental studies are often a subject of interest to many researchers. The results of such investigations give a full insight of complex structural behavior under loading, visualize potential material weaknesses and evaluate if mechanical factors play a substantial role in the pathogenesis of the lesions of the investigated biological structure. The use of FEM enables most of the researchers to abandon the experimental animal models and expand the investigation on computational models, analyzing stress and strain distribution as an indicator of structural biomechanical behavior. The aim of this paper was to present computational modeling of any (human or animal) intact tooth behavior under loading and evaluate the intact tooth stress and strain distribution pattern. For the investigation to be carried out a mathematical model of an intact tooth had to be created. The difference in stress concentration, when masticatory forces are acting lateraly comparing to the ones acting vertically, can be attributed to the basic mechanical principle of leverage which states that forces concentrate at or near the fulcrum. When subjected to lateral loading, tooth with its root acts as a simple lever that fulcrums near the cervical region. This paper offers the new approach in veterinary dental scientific research. Once when a mathematical model is made, it is possible by changing the parameters to investigate different clinical situations. With increasing popularity of veterinary dentistry, the FEM/computational analyses could became a useful tool in biomechanical veterinary dental research due to its noninvasiveness