A B S T R AC TIntroduction: The use of intraoral mouthguards is the basic method of preventing injuries of the stomato gnathic system while practicing extreme, contact, team and recreational sports. However, the presence of a protec tive splint in the mouth, especially during exercise, when increased oxygen uptake is needed, may adversely affect the level of blood oxygenation. It is also necessary to compare different types of splint as they differ in retention, size and comfort of usage. Objectives: The aim of the study was to evaluate the effects of different intraoral mouthguard types for the cardio respiratory capacity of athletes. Material and methods: Thirty athletes aged 2037, testing a total of 120 intraoral mouthguards of different typestwo custommade mouthguards prepared and two "boil and bite" splints adapted -took part in the study, in which cardiorespiratory capacity was compared using CRF, IF, METs and Watt indicators, based on tests conducted on the Fitmate device correlated with a stationary exercise bike. Results: The analysis of variance showed no differences between the compared parameters regardless of the tested mouthguard. The use of intraoral mouthguards during exercise does not affect the cardiorespiratory endurance of athletes. Conclusions: Mouthguards users, trainers and doctors should be informed about the lack of a negative impact of its usage during training and competition on cardiorespiratory endurance.

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Head: prof. dr hab. n. med. Elżbieta Mierzwińska-Nastalska Summary Constant advances in laboratory technology, along with the development of dental materials, have created new opportunities for prosthetic reconstruction of clinical crowns of teeth. The most important factor affecting the possibility of the long-term functioning of a permanent prosthetic restoration in the oral cavity is the precision of its production, including the accuracy of adhesion of the restoration to the abutment. The aim of the study is to review the latest research results concerning the impact of the technology of ceramic restoration production on the accuracy of their adhesion to the structure of the abutment. Among the articles available in the Medline database, those from the years 2011-2018 were selected for the analysis. All chosen articles present a description of in vitro studies and concern the comparison of marginal adaptation depending on the type and method of preparation of the ceramic material.