Globalization in dental education is an important issue in Japan. However, implementing strategies for globalization related to aspects such as infrastructure, educational goals and content, educational methodologies, and standards is not easy. The dental training programmes at the Faculty of Dentistry at The University of Hong Kong can offer some insight into the process. While The University of Hong Kong is world-renowned and has embraced globalization, it is located in Asia, where English is not the native language. The latter reflects the same situation as in Japan, but the Hong Kong and Japanese dental schools differ considerably in the medium of education, teaching styles, undergraduate curriculum, postgraduate education system, character of the students, and duties of the academic staff. Dental education at The University of Hong Kong may thus provide a role model for the planning and integration of globalization within the tertiary dental education system in Japan.
The osseointegration capacity of implant surfaces deteriorates over time. However, the treatment of titanium surfaces with ultraviolet (UV) light restores the original properties of the surface and causes considerable acceleration in the process of osseointegration. This study reviews two recent findings: the aging-like time-dependent biological degradation of titanium surfaces and the discovery of UV photofunctionalization as a solution to this phenomenon. This technology and the associated knowledge herald a new age of implant treatment and provide a novel concept of osseointegration in the science and therapeutics of implant dentistry. In addition, we expect to revolutionize clinical implant therapy through these new concepts.
The A7 cell group in the dorsolateral pons provides noradrenergic innervation of the spinal cord. Activation of this descending pathway (the A7 descending system) produces bi-directional effects on nociceptive processing in the dorsal horn, which are facilitation mediated by α1-adrenoceptor and inhibition via α2-adrenoceptor. Peripheral nerve injury sometimes results in neuropathic pain. Hypersensitivity of dorsal horn neurons under neuropathic conditions is linked to activity in descending pathways from the brain. The aim of this study was to examine the involvement of the A7 descending system under neuropathic conditions. Experiments were performed on male Sprague-Dawley rats (n=35). Bilateral lesions of the A7 area were performed by microinjection of kainic acid. The tibial and common peroneal the nerves were sectioned produce neuropathic conditions (spared nerve injury, SNI). For estimating mechanical allodynia, mechanical hypoalgesia and cold allodynia, paw withdrawal threshold (PWT), paw withdrawal latency (PWL) and paw withdrawal frequency (PWF) were measured. PWTs significantly decreased following A7 lesions. After SNI, PWTs significantly decreased in A7-lesioned and sham-lesioned rats. However, no significant difference was observed between the decreased rates of PWTs in A7-lesioned and sham-lesioned rats. PWLs significantly increased in sham-lesioned rats compared with A7-lesioned group. PWFs significantly increased in the A7-lesioned and sham-lesioned rats. Intrathecal injection of prazosin, an α1-adrenoceptor antagonist, failed to change the PWT, PWL and PWF in non-A7-lesioned neuropathic rats. These results suggest that (1) the A7 descending inhibitory system has tonic activity under normal conditions, and (2) this system functions in a complex manner during the neuropathic pain state.
The Invisalign system is widely used to treat mild to moderate tooth crowding. Recently, Invisalign appliances have been used in orthodontic patients with increasingly complex malocclusions. When using an Invisalign appliance to correct severe tooth crowding, root positions must be carefully controlled during extraction space closure. We report our treatment of a 34-year-old man who presented with a Class I relationship, a midline deviation, severe overjet, and severe tooth crowding in the maxillary and mandibular anterior regions. The treatment plan involved extraction of the maxillary and mandibular first premolars on both sides. We treated this patient with severe anterior tooth crowding using an Invisalign appliance combined with a fixed appliance with power arms and elastics. Treatment by Invisalign as an application of computational calculated result, especially in extraction cases, doctors should have professional skill and experience as an orthodontist.