The aim of this study is to evaluate the effects of orthodontic traction, by means of light and controlled forces, on root length in impacted maxillary canines and physiologically erupted maxillary canines. Disinclusion of impacted maxillary canines is a frequent procedure in orthodontics due to their higher incidence of impaction. The effects of orthodontic traction, by means of light and controlled forces, can lead to a resorption of the root length in impacted and physiologically erupted teeth. Therefore, apical root resorption is a common phenomenon that must be taken into consideration. Apical root resorption measurements were taken using pre-treatment CBCTs and pre-treatment and post-treatment digital panoramic radiographs of 52 patients who underwent fixed-appliance treatment by using light and controlled orthodontic forces. The experimental group consisted of 26 patients with one impacted maxillary canine. The control group consisted of 26 patients without any impaction. Apical root resorption was calculated from root lengths before and after orthodontic treatment. In the experimental group, impacted canines with incomplete apical formation underwent root elongation, while impacted canines with completed root formation went through apical root resorption. The latter showed a slightly greater apical root resorption (0.2 mm) compared to the control group (95% confidence interval; p = 0.04). The extent of root resorption of impacted canines was significantly higher than that of physiologically erupted ones. However, this differential resorption did not compromise the structural and functional integrity of the involved teeth. The orthodontic treatment performed with light and controlled forces is, therefore, a procedure to be considered acceptable and safe.

Background: Hollow posts have been introduced in clinical practice, providing the possibility of injecting luting resin directly into the post. The aim of our study was to compare quartz fiber hollow posts with solid posts. Methods: In total, 20 human teeth with straight single root canals were utilized for this study, divided into two groups with 10 elements each, one restored with radiopaque quartz fiber hollow posts and the other with radiopaque quartz fiber solid posts. In total, two micro-CT (micro-computerized tomography) analyses allowed us to evaluate both the presence of air voids in the luting resin and the different capacities of posts to penetrate until full depth into the post space. Results: The authors observed that hollow quartz fiber posts create a smaller volume of air voids in the luting resin (p < 0.01) and better fit (p < 0.05) the post space compared to the solid posts. Conclusions: Hollow posts can promote retention. Future studies with larger samples are encouraged to confirm these findings and provide possible better long-term results for post-endodontic reconstructions in vivo.

This entry paper explores the multifaceted oral health crisis in the Pacific island nation of Tuvalu, a remote archipelago of nine coral atolls. It delves into the severe burden of oral diseases, such as early childhood caries (ECC) and periodontitis, which are rampant within its population of just over 11,000. The analysis investigates the primary drivers of this crisis, including a significant dietary transition towards imported, ultra-processed foods, compounded by profound socioeconomic challenges and a lack of public health literacy. The paper critically examines the systemic failures of the national healthcare system, characterized by the absence of a formal oral health policy and a critically inadequate dental workforce, which forces residents to seek complex care abroad. Furthermore, it highlights how extreme geographic isolation and severely limited air connectivity function as direct barriers to accessing essential services, rendering specialized treatments like orthodontics and effective management of dental emergencies virtually impossible. In response to these challenges, the paper discusses innovative, forward-looking solutions, including the potential of teledentistry to bridge service gaps, the strategic development of regional medical or dental hubs in proximity to the biggest airports to centralize care, and the necessity of integrating oral health into broader strategies for economic development and climate resilience.

Background Hollow posts have been introduced in clinical practice providing the possibility of injecting composite cement directly into the post. Aim of our study was to compare quartz fiber hollow posts with solid posts. Methods: 20 human teeth with straight single root canals were utilized for this study, dividing them into 2 groups with 10 elements each one restored with radiopaque quartz fiber hollow posts or radiopaque quartz fiber solid posts. 2 micro-CT (micro-computerized tomography) analyses allowed to evaluate both the presence of air voids in the cement and the different capacity of posts to penetrate until full depth into the post-space. Results: The Authors observed that hollow quartz fiber posts have shown to create a smaller volume of air voids in the cement (p< 0,05) and to better fit (p< 0,05) the post-space compared to the solid posts. Conclusion: Hollow posts can promote retention and lead to better long-term results for post-endodontic reconstructions.