The foundations of the angolan competitiveness, except the sectors of oil and diamonds, are the comparative advantages derived from the classical production factors: available hand labor, land and capital. In the new paradigm of regional development economy, these advantages are no longer relevant, mainly in view of the \"new\" production factor knowledge. The need to provide training courses that are more than sets of subjects (Baker & Siryk, 1989; Ferreira, 1991), and promote academic experience scenarios in which students actively participate in the construction of their training, thus stimulating self learning (eg, Fouad & Smith, 1996; Gainor & Lent, 1998; Hackett, Betz, House & Rocha-Singh, 1992; Lapan, Boggs & Morrill, 1989; Lent, Brown & Larkin, 1984, 1986; Lent, Lopez & Bieschke, 1991, 1993) are essential in this development objective. The productivity of enterprises is a complex issue, difficult to understand, where the individual must always emerge as essential in this process. Already in 1964, Blau and his Social Exchange Theory addresses the need to link processes and people, social exchanges between managers and employees maximize productivity processes in companies. Training is one of the internal processes of the hardest businesses to understand the level of organizational impact and individual (Kirkpatrick, 1979) but the level of organizational and personal development is one that translates most obvious and direct benefits to the individual through the passage of knowledge . Our work is theoretical basis the \"theories of regional imbalance\", with the most recognized representatives François Perroux (1955), Hirschman (1957 and 1958) and Kaldor (1967), the Causality Circular and Cumulative Model (Myrdal, 1957) and Model of Adjustment and Welfare under regulatory living conditions (Lent, Brown & Hackett, 2006). The common denominator of his thought was that the free play of market forces would not tend to the internal economic balance, but that the \"Back-wash effects\" (adverse effects on the periphery) more than offset the \"Spreadwash effects\" (positive effects). The differentiating factor of this work lies in the presentation of the driving force of regional development: the \"production factor\" knowledge / education and spatial differences and the under-valuation which has been subject.

objective:Impacted lower third molar is found in 90% of the general population.various degrees of post-operative complications are frequently observed in third molar extraction surgery.there fore,a surgical procedure that decreases post-operative complications should be a prior consideration for surgeons.in this study ,we compare operating time and postoperative complications between two methodsin the extraction of mandibular impacted third molars. Methods: 100patients , with an age range of 18~26, bilateral symmetrical mandible impactedthird molars on panoramic radiographs were included in thisstudy. The impactions on the left and right sideswere operated byT-shape and three sections methods,separately.Preoperative and Postoperative，medications and management were similar for two groups. The subjects were recorded operating time, root pruning situation, postoperative complications and evaluated at 24h, 48h, 120h Postoperativeoutpatient referral. Date was analyzed by t-test using SPSSl7.0 software.Results: Comparing the two techniques, we were observed a statistically significant decrease in distal parts removing time, postoperative24h facial edema and pain. While postoperative trismus and root pruning situation were no statistically significant. We also did not found any nerve lesions.Conclusion: The results of our study indicate that the surgical technique usingT-shape method likely to be a reliable method to extracthorizontal impacted third molarseasily, quickly and with less trauma to around tissue and complications.