Intergenerational Mobility and Schooling Decisions in Germany and Italy: the Impact of Secondary School Tracks.

Intergenerational mobility in income and education is affected by the influence of parents on children's school choices. Our focus is on the role played by different school systems in reducing or magnifying the impact of parents on children's school choices and therefore on intergenerational mobility in general. We compare two apparently similar educational systems, Italy and Germany, to see how the common feature of separate tracks at Secondary School level may produce different impacts on children choices. Using data from a cross-country survey (PISA 2003), we study the impact of parental education on track choice, showing that the greater flexibility of the Italian system (where parents are free to choose the type of track) translates into greater dependence from parental background. These effects are reinforced when moving to post-secondary education, where the aspiration to go to college is affected not only by the school type but also (in the case of Italy only) by parental education. We then move to country-specific data sets (ISTAT 2001 for Italy and GSOEP 2001 and 2002 for Germany) to study the impact of family background on post-secondary school choices: we find this impact is greatly reduced when we control for secondary school tracks. Overall, we estimate large asymmetries by gender, with women's behavior more independent from family backgrounds than men's behavior.gender Secondary School tracks; Education; Intergenerational Mobility

Effect of Orthophosphoric Acid and Er:YAG Laser Etching on Micro-shear Bond Strength to Enamel: An In Vitro Pilot Study

Background: Dental conditioning is one of the most important phases during enamel bonding procedures to obtain clean surfaces, smear layer removal with collagen active sites and hydroxyapatite exposure. Objective: The aim of this study was to compare the micro-shear bond strength (μSBS) of different adhesive systems after two different etching techniques: 37% orthophosphoric acid (H3PO4) and Er:YAG laser. Methods: Ninety permanent extracted molars were embedded into epoxy resin blocks and sectioned longitudinally. Specimens were randomly assigned to one of the following groups (n=30), depending on the etching protocol: 37% H3PO4 for 30 s (Group 1), Er:YAG laser 100mJ-10Hz (Group 2), and Er:YAG laser 100mJ-10Hz followed by 37% H3PO4 for 30 s (Group 3). Each group was further divided into two subgroups depending on the bonding agent used on enamel (n=15): A) EE-Bond (Tokuyama) and B) Peak universal (Ultradent). A two-way analysis of variance (two-way ANOVA) was conducted and the level of significance was set to p=0.05. Results: The etching procedure was a significant factor influencing the results (p=0.006), while no differences were observed for the two adhesive systems tested (p>0.05). Group 3 recorded the highest bond strength values, according to the following sequel: Group 3 < Group 2 < Group 1 < 0.05. Conclusion: The combination of phosphoric acid etching with Er:YAG laser provided the most favourable bond strength to enamel. Further morphological studies are currently ongoing