Secondary school implementation of a healthy eating policy.

ISSUE ADDRESSED: Healthy canteen policies regulating the sales of food and beverages are available across all the states and territories in Australia. The aim of this study was to assess the compliance with a newly updated healthy school canteen policy in New South Wales (NSW) among a sample of secondary schools. METHODS: A cross-sectional study of secondary school canteen menus was undertaken in selected regions across NSW (September 2017-November 2017). Government and Catholic secondary schools with a canteen menu publicly available on school websites were eligible for inclusion. Menus were classified according to the NSW Healthy School Canteen Strategy using a Quick Menu Audit tool, previously validated in primary schools. RESULTS: Of 62 Catholic and 128 Government secondary schools located in the study region, 53 secondary schools (25 Catholic and 28 Government) were eligible to participate. The average percentage of "everyday" (healthy) items on secondary school menus was 54% (strategy criteria is >75%). Twenty-eight per cent of menus had no "sugary drinks" (should not be sold). None of the 53 menus assessed met all strategy criteria regarding the availability of foods and beverages. There was no statistically significant difference in meeting; (a) 75% minimum "everyday" items and (b) no "sugary drinks," by socio-economic region, remoteness, school enrolments or school type. CONCLUSIONS: If public health benefits of healthy eating policies are to be realised, secondary schools need to be supported to implement such policies. SO WHAT?: Future research assessing the impact of intervention strategies to support policy implementation in secondary schools is recommended.

Interlot variations of transition temperature range and force delivery in copper-nickel-titanium orthodontic wires.

INTRODUCTION: The manufacturing process for copper-nickel-titanium archwires is technique sensitive. The primary aim of this investigation was to examine the interlot consistency of the mechanical properties of copper-nickel-titanium wires from 2 manufacturers. METHODS: Wires of 2 sizes (0.016 and 0.016 × 0.022 in) and 3 advertised austenite finish temperatures (27°C, 35°C, and 40°C) from 2 manufacturers were tested for transition temperature ranges and force delivery using differential scanning calorimetry and the 3-point bend test, respectively. Variations of these properties were analyzed for statistical significance by calculating the F statistic for equality of variances for transition temperature and force delivery in each group of wires. All statistical analyses were performed at the 0.05 level of significance. RESULTS: Statistically significant interlot variations in austenite finish were found for the 0.016 in/27°C (P = 0.041) and 0.016 × 0.022 in/35°C (P = 0.048) wire categories, and in austenite start for the 0.016 × 0.022 in/35°C wire category (P = 0.01). In addition, significant variations in force delivery were found between the 2 manufacturers for the 0.016 in/27°C (P = 0.002), 0.016 in/35.0°C (P = 0.049), and 0.016 × 0.022 in/35°C (P = 0.031) wires. CONCLUSIONS: Orthodontic wires of the same material, dimension, and manufacturer but from different production lots do not always have similar mechanical properties. Clinicians should be aware that copper-nickel-titanium wires might not always deliver the expected force, even when they come from the same manufacturer, because of interlot variations in the performance of the material.