introduction: contact sports may lead to dental injures, which may often be prevented by using mouthguards. the purpose of this study was to evaluate the prevalence of traumatic dental injuries (tdi) in professional contact sport athletes and to determine the awareness regarding use of mouthguards in this group. methods: a questionnaire containing a number of  questions regarding the demographi...

This study used modern thermal imaging techniques to investigate the temperature rise induced at the pulpal well during thermal debonding of ceramic brackets. Ceramic brackets were debonded from vertically sectioned premolar teeth using an electrothermal debonding unit. Ten teeth were debonded at the end of a single 3-second heating cycle. For a further group of 10 teeth, the bracket and heatin...

Oral lichenoid reaction is a clinical entity characterized by microscopic features of hypersensitivity due to foreign body or contact reaction. It is usually presented in the cheek mucosa after chronic contact irritation from various materials used in dentistry. Amalgam restoration of tooth cavities has been used for many decades. This filling material is occasionally suspected for chronic epid...

Gear box dynamics is characterised by a periodically changing stiffness. In real gear systems, a backlash also exists that can lead to a loss in contact between the teeth. Due to this loss of contact the gear has piecewise linear stiffness characteristics, and the gears can vibrate regularly and chaotically. In this paper we examine the effect of tooth shape imperfections and defects. Using sta...

Gearboxes are one of the most power dense systems used today, and in certain instances their limiting factor is the ability to evacuate heat from the gear contact. This work analyses the efficiency (i.e. heat generation) and tooth temperature in the three lubricating conditions dip, into mesh spray and out of mesh spray for superfinished gears which are then compared to ground gears. A back-to-...