Continuing bonds following stillbirth: protective and risk factors associated with parental bereavement adaptation.

OBJECTIVE: To investigate any association between expressions of parents' continuing bond with their stillborn baby and bereavement adaptation. BACKGROUND: Continuing bonds theory suggests that bereaved parents adapt to the loss of their child by sharing and transforming mental representations of the child, allowing them to be integrated into parents' everyday lives. Little is known about the mental health benefits of expressing continuing bonds following stillbirth. This study examined any association between aspects of parents' relationship with their stillborn baby, social support for the relationship, and bereavement adaptation. METHODS: Cross-sectional questionnaire study. Parents of stillborn babies (N=170) completed an online questionnaire examining engagement in continuing bonds expressions; characteristics of parents' relationship with their stillborn baby and their experience of sharing it; social support, and meaning-making. Measures of mental health were included to quantify bereavement adaptation. RESULTS: Regression analyses showed that time since death, meaning-making, engaging with nature, and legacy building are positively linked to bereavement adaptation. Risk factors included inadequate social support for the relationship, a greater desire to share it more freely, an increased sense of integration with baby, and societal pressure to move on. CONCLUSION: Key aspects of parents' ongoing relationship with their stillborn baby and the social context are related to bereavement adaptation.

Novel Fluoride- and Chloride-containing Bioactive Glasses for Use in Air Abrasion.

OBJECTIVES: To investigate the degradation, fluorapatite formation, biological safety and cutting efficiency on dentine of the mixed fluoride- and chloride-containing bioactive glasses (BGs). METHODS: Two series of mixed fluoride- and chloride-containing glasses (GPFCl and GPF2.3Cl series) were synthesized using a melt-quench method. Glass transition temperature (Tg) and the bioactivity in term of glass degradation and fluorapatite formation were evaluated in Tris buffer solution. The cutting efficiency of the powdered BGs (GPF2.3Cl series) on dentine via air abrasion was investigated using white light profilometry and scanning electron microscope. The cytotoxicity of GPF2.3Cl series on human periodontal ligament stem cells (hPLSCs) and oral fibroblasts (OFB) were examined by MTT. RESULTS: These BGs are highly degradable and able to form fluorapatite within 3h of immersion. The formation of CaF2 was also found in the high fluoride-containing BGs. The faster glass degradation was evidenced in the BGs with higher chloride. A significant reduction of Tg from 790°C to 463°C was seen with increasing in calcium halide content. Air abrasion on dentine using the low and intermediate chloride-containing glasses demonstrates clear depressions, while no depression was found using the high chloride-containing glass. Moreover, the studied BGs showed no cytotoxicity to hPLSCs and OFB. CONCLUSIONS: The glasses with mixed fluoride and chloride integrate the benefits from the presence of both, showing rapid glass degradation, fast fluorapatite formation, excellent biocompatibility and controllable hardness to provide a selective cutting efficiency on dentine. CLINICAL SIGNIFICANCE: The developed BGs air abrasive with tunable hardness by varying chloride content can selectively cut different dental tissues. In clinic, a relatively hard BG is of great interest for caries preparation, while a soft glass is attractive for tooth cleaning.

Seeing power with a flashlight: DIY thermal sensing technology in the classroom.

This paper contributes to the growing literature on 'making and doing' in Science and Technology Studies (STS) by describing and theorizing the teaching of making and doing. We describe a collaborative do-it-yourself (DIY) technology project taught simultaneously in Canada and the United States, in sociology and public health, to undergraduates with no prior electronics experience. Students built thermal flashlights - low cost digital tools for making thermal images - and employed them to research their surrounding environments. By making and using the thermal flashlights, learners investigated power in two senses: identifying social power relationships embedded within normally unquestioned infrastructures, and exploring these infrastructures' connection to industrial forms of power, such as heat and electricity. Students and instructors came to understand how the control of power, light and temperature is vital to human-made infrastructure and environmental health threats that characterize the 21st century. Through this project, students went from being passive consumers of such power to become active investigators of their socio-technical systems by producing unique knowledge that enabled them to imagine how they might make and inhabit their environments differently. Breaking down the distinction between teaching and research, this article explores the promise of 'making and doing' in university courses to create new collaborative research platforms that could spread laterally and scale to transform social and technical infrastructures.