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Objective To explore the influence of different bone quality around the implant on the implantation accuracy, the computer-aided design of implant guide plate was used for patients with poor bone quality to evaluate its accuracy. Methods Retrospective analysis of relevant clinical data from 29 single-tooth implant patients with relatively poor bone quality meeting inclusion criteria was conducted. Using 3Shape Implant Studio software, implant plans were designed and fully guided digital templates were fabricated before surgery. Implantation was guided by the templates throughout, with torque and ISQ values recorded to evaluate the initial stability of the implant. Postoperative implant positions were reconstructed using CBCT images, and the three-dimensional deviation of implant placement was evaluated in conjunction with the preoperative design. Bone quality around the implants was also recorded and analyzed before and after surgery. Results In this study, digital guide plates were used in patients with poor bone quality, and the initial stability of implants was ≥ 20 N·cm except for three cases. In cases of poor bone quality, the accuracy of the fully guided digital templates was as follows: cervix deviation (0.94±0.59)mm, apex deviation (1.40±0.81)mm and angle deviation 4.10°±2.99°. Bone quality had a greater impact on angle deviation (P

Addressing fracture-related infections (FRI) and impaired bone healing remains a significant challenge in orthopedics and stomatology. Researchers aim to address this issue by utilizing biodegradable biomaterials, such as magnesium/poly lactic acid (Mg/PLA) composites, to offer antibacterial properties during the degradation of biodegradable implants. Existing Mg/PLA composites often lack sufficient Mg content, hindering their ability to achieve the desired antibacterial effect. Additionally, research on the anti-inflammatory effects of these composites during late-stage degradation is limited. To strengthen mechanical properties, bolster antibacterial efficacy, and enhance anti-inflammatory capabilities during degradation, we incorporated elevated Mg content into PLA to yield Mg/PLA composites. These composites underwent in vitro degradation studies, cellular assays, bacterial tests, and simulation of the PLA degradation microenvironment. 20 wt% and 40 wt% Mg/PLA composites displayed significant antibacterial properties, with three composites exhibiting notable anti-inflammatory effects. In contrast, elevated Mg content detrimentally impacted mechanical properties. The findings suggest that Mg/PLA composites hold promise in augmenting antibacterial and anti-inflammatory attributes within polymers, potentially serving as temporary regenerative materials for treating bone tissue defects complicated by infections. [ABSTRACT FROM AUTHOR]

Despite being a traditional research topic in urban studies, competitive relations among cities have rarely been quantified in empirical research. Drawing on methods of social network analysis, this study aims to extract intercity competitive relations at the global scale based on the global corporate spatial organization of manufacturing. The geographies of competitive relations manifest different patterns from those of global city networks based on cooperative relations. This study finds an inverse U‐shaped relationship between cities' connectivities and their gross intensity of competition. Although most global cities have unique positions in global manufacturing competition, intensive competition occurs among some global cities, whereas extensive competition exists between wide‐ranging cities with weak global connectivities. Furthermore, there is strong competition among cities of similar size and among those located in the same region. This research not only re‐examines global intercity relations from a competitive perspective but also informs the formulation of policy‐making on competition strategies of cities. [ABSTRACT FROM AUTHOR]

An analytical method was developed for the rapid determination of 226Ra in water through liquid scintillation counting. The separation and purification of 226Ra from water were performed by co-precipitation using barium sulfate as the carrier; the direct measurement of 226Ra was realized by using a liquid scintillation spectrometer. Through sample analysis, a mathematical model for uncertainty evaluation was established and the sources of uncertainty were analyzed. The results showed that the overall counting efficiency of 226Ra is 91.3%-98.5%, the detection limit is 0.01 Bq/L, and the relative extended uncertainty is 7% (k=2), indicating that the proposed method is suitable for the rapid analysis of 226Ra in drinking water. The uncertainty of the method for the determination of 226Ra in water is mainly caused by the errors of sample counting rate and overall counting efficiency.

Background: Age‐related changes to the face pertinent anatomy and important aspects of autologous fat grafting have been widely applied in facial rejuvenation. Various types of autologous fat products (Macrofat, Microfat, SEFF, nanofat, and SVF‐gel) with different properties and applicabilities have been introduced and available for surgeons. Methods: Key differences between common techniques for fat processing and infiltration. Develop a plan for patients based on site‐specific facial anatomical zones, we suggested a pyramidal multiple‐theory (multi‐type, multi‐method and multi‐layer) for facial fat grafting. Based on the complicated mechanism of the face decrepitude in different layers of facial soft tissue, autologous fat products with various particle sizes and components into different layers. Results: Fifty‐eight patients underwent this facial fat grafting strategy from June 2020 to Jan 2022. All achieved cosmetic improvements, with higher patients' satisfaction, and minor complications. Our facial fat grafting strategy takes advantage of different fat products and is able to address the physiological tissue changes during aging, more properly and targetedly, than the traditional facial fat grafting. Conclusions: Fat grafting to the face aids in volume restoration and rejuvenation, thereby addressing soft‐tissue atrophy associated with the aging face, acquired conditions, or congenital malformations. The technique described as "lipo‐tumescence" has been successfully used in the breast and other regions of the body that have radiation damage and is discussed in this article specifically for the face and neck. [ABSTRACT FROM AUTHOR]