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Aim of this study is analyze the effects of dental occlusion on postural stability in patients with previous whiplash and normal occlusion. Materials and methods: 36 adult patients with previous whiplash and normal occlusion (good alignment, 1st class or mild 2nd class deep bite for mandibular retrusion) were selected. The patients were suffering from masticatory muscles pain caused by clenching during sleep. Exclusion criteria: use of psych drugs. To simulate the conditions of sleep (with a reduction of proprio-and esteroceptive inputs for postural management performed by CNS), we used postural Romberg analysis (feet together, closed eyes)on stabilometric platform changing occlusal parameters only, under the following conditions: 1) in occlusal rest position, 2) in centric occlusion, 3) in clenching, 4) with occlusal disengage with cotton rolls and 5) in clenching on cotton rolls. Time of each test: 15 seconds. It was performed a statistical analysis with T-test comparing between them the mean of all tests. Results: stabilometry data (postural ball and ellipse) show better postural performances in centric occlusion and clenching in centric occlusion, and a worsening in all tests with occlusal disengage (with statistically significant difference - p<0.05). Conclusions: postural instability caused by whiplash increases muscles tone and dental clenching as compensatory effects, with onset of facial pain. An occlusal disengage (like an occlusal splint to reduce clenching)induces a postural worsening in patients with normal occlusion, while centricocclusion increases the stability. These results suggest that stomatognathic organ has a new physiological function: the posture stabilization. [ABSTRACT FROM AUTHOR]

24 patients are selected and 30 teeth in vestibular mucosae, without keratinized gingiva. No active periodontal disease (no BOP and gingival recessions). No BOP and CAL loss at the start of the orthodontic treatment. Every patient was treated with self ligating appliances (Time2/Time3, American Orthodontics). In every orthodontic session (each 30 days as average) the patient was treated with Nd: Yag laser biostimulation, for 90 seconds, with 320 micron fiber section, on utilizing the Biostimulating machine paremeters. No termical effects were produced by lasers applications. At the moment of debonding, 30 teeth involved in the research were evaluated in terms of quality and quantity of attached gingiva. BOP and CAL loss were also investigated. Every tooth considerated, at the end of orthodontic treatment showed a attached gingiva around the crown: the average of keratinized gingiva at the end of the study was 2,7 mm and the mean increasing at each month was 0,45 mm. The combination between self ligating appliances and laser's biostimulation could improve the differentiation of periodontal ligaments stem cells in fibroblasts, able to promote attached gingiva around the crown of the teeth erupted in oral vestibular mucosae. [ABSTRACT FROM AUTHOR]