How Digital Scans Are Helping Kids Get Faster Dental Care

Schulz-Weidner, N., Schraml, E.M., Frodermann, T. et al. Comparison of dental findings between dentists and pediatricians using intraoral scan-based teledentistry in children. Scientific Reports, September 2025.

A new study in Germany shows that “teledentistry” (using digital mouth scans to check children’s teeth) can be just as effective as a traditional in-person exam. Researchers wanted to test whether pediatricians, who are usually not dental specialists, could spot dental problems using intraoral scans (a special camera that creates a 3D image of teeth) and decide when kids need treatment. The study included 70 participants aged 4-17. Each child had a regular dental check-up and then had their mouth scanned with an intraoral scan. These scans were later reviewed by a pediatrician, who received basic training on children’s dental health, and a dentist. The researchers compared what they found to the in-person dental exams and found promising results. Both the pediatrician and the dentist were able to identify cavities, tooth defects, and urgent dental needs almost as well as the in-person checkups. Pediatricians were nearly as accurate as dentists in deciding whether a child needed quick dental care. However, dentists were still better at spotting detailed issues like the exact type of tooth fillings, but this did not affect treatment decisions in most cases. The results show that there is no significant difference between digital teledental findings and in-person exams. This study proves that with some basic training, pediatricians can play a key role in early dental screening, especially in areas where dentists are hard to reach. Non-dental professionals can now be more involved in early oral health assessments. Using this method means fewer missed problems, faster treatment, and healthier smiles for children.

What Lies Beneath The Outer Layers Of A Star?

Schulze, Steve, Avishay Gal-Yam, Luc Dessart, Adam A. Miller, Stan E. Woosley, Yi Yang, Mattia Bulla, et al. “Extremely Stripped Supernova Reveals a Silicon and Sulfur Formation Site.” Nature News, August 20, 2025.

Astronomers captured a rare glimpse inside a star as it exploded, revealing what lies beneath its outer layers. Dr. Steve Schulze and his team observed a supernova, SN 2021-yfj, unlike any seen before. Schulze explains that stars are like giant cosmic onions: hydrogen on the outside, then helium, carbon, oxygen, silicon, and finally the iron core. Normally, we only see the outer layers during a star’s death, but this star had already shed nearly all of its shells before it exploded. That allowed scientists to look much deeper into its structure and confirm long-standing predictions that the inner core has an oxygen-silicon shell.

One of the most surprising findings was the presence of helium. Helium is an element that should have been burned away at a much earlier stage of the star’s life. This discovery has left scientists puzzled and is challenging existing models of stellar evolution and supernova explosions.

Researchers believe the star was originally extremely massive—about 60 times the mass of our Sun—and likely lost much of its material over thousands of years through a process called “pair-instability,” where repeated pulses of energy blew away outer layers before the final explosion.

Schulze says the next step is to find more stars like this to understand whether 2021-YFJ represents a new class of supernovae. This discovery may even lead to a “gold rush” as astronomers search for other missing links in the life cycles of stars.

How Sleep Cycles Impact Our Health

Minami, Y., Kishi, A. & Ueda, H.R. Preventive circadian medicine: improving health with sleep checkups. npj Biological Timing and Sleep, September 2025

A new study investigates how a single night of shifting the sleep-wake cycle impacts glucose metabolism, insulin sensitivity, and hunger signals in healthy young adults. Sixteen men and women took part in a highly controlled lab experiment. They followed a sleep schedule for several nights before the test. On the test day, they shifted their sleep-wake cycle by 12 hours to simulate a night shift. They stayed awake all night and slept during the day. Results showed significantly higher blood glucose levels and a reduction in insulin sensitivity, despite participants having identical food intake. The test also caused ghrelin (hunger hormone) to increase, leading to stronger feelings of hunger, while leptin (satiety hormone) decreased, which could lead to eating more than usual. Participants also reported stronger cravings for high-calorie foods like sweets and snacks. Even a single night of circadian misalignment is enough to cause noticeable metabolic disturbances. These hormonal changes may lead to overeating, which, over time, could result in weight gain and insulin resistance if the circadian disruption becomes chronic. This study helps explain why night shift workers and those with irregular sleep patterns have higher rates of obesity, diabetes, and metabolic diseases. Staying awake all night and sleeping during the day even once significantly disrupts glucose metabolism and boosts hunger signals. Repeating this cycle regularly increases the risk of obesity and diabetes. The findings highlight the importance of stable sleep-wake cycles for maintaining metabolic health and suggest that strategies to reduce circadian disruption could benefit public health.