Different protocols to produce artificial dentine carious lesions in vitro and in situ: hardness and mineral content correlation

This study compared dentine demineralization induced by in vitro and in situ models, and correlated dentine surface hardness (SH), cross-sectional hardness (CSH) and mineral content by transverse microradiography (TMR). Bovine dentine specimens (n = 15/group) were demineralized in vitro with the following: MC gel (6% carboxymethylcellulose gel and 0.1 M lactic acid, pH 5.0, 14 days); buffer I (0.05 M acetic acid solution with calcium, phosphate and fluoride, pH 4.5, 7 days); buffer II (0.05 M acetic acid solution with calcium and phosphate, pH 5.0, 7 days), and TEMDP (0.05 M lactic acid with calcium, phosphate and tetraethyl methyl diphosphonate, pH 5.0, 7 days). In an in situ study, 11 volunteers wore palatal appliances containing 2 bovine dentine specimens, protected with a plastic mesh to allow biofilm development. The volunteers dripped a 20% sucrose solution on each specimen 4 times a day for 14 days. In vitro and in situ lesions were analyzed using TMR and statistically compared by ANOVA. TMR and CSH/SH were submitted to regression and correlation analysis (p < 0.05). The in situ model produced a deep lesion with a high R value, but with a thin surface layer. Regarding the in vitro models, MC gel produced only a shallow lesion, while buffers I and II as well as TEMDP induced a pronounced subsurface lesion with deep demineralization. The relationship between CSH and TMR was weak and not linear. The artificial dentine carious lesions induced by the different models differed significantly, which in turn might influence further de- and remineralization processes. Hardness analysis should not be interpreted with respect to dentine mineral loss

How Corporate Social Performance Is Institutionalised Within the Governance Structure

Since Ackerman in Corporate social responsiveness, the modern dilemma (1973), pleaded for the institutionalisation of corporate social performance (CSP) in business processes, researchers have focused on the role of strategy in CSP. This article demonstrates that CSP is institutionalised within the governance structure. We will attempt to make this clear by means of a description of the Dutch system of corporate governance. Under certain circumstances Dutch companies are already bound to CSP due to prevailing legislation. A governance perspective shows that CSP is institutionalised within a company’s governance structure. “Processes of responsivenessâ€\x9D, since long regarded as a starting point of CSP-analysis, appear to be decision-making processes. Within these processes the expectations of the stakeholders can be institutionalised, trust can be built and interests can be incorporated. This makes CSP context-dependent. However, it is possible to analyse companies by comparing the companies’ individual governance structures. The article concludes that CSP-analysis can fruitfully extend into analysing in the role of the stakeholders in the influence-pathways that are incorporated within the governance structure. Copyright Springer Science+Business Media B.V. 2007corporate governance, corporate social performance, stakeholder influence,