Journal of long-term effects of medical implants最新文献

Nowadays, dental implants are one of the essential treatments for human beings to maintain their chewing function and aesthetics. But after surgery, the Young modulus promotes stress shielding and stress simulation at the bone-implant contact, thus decreasing the density of the bone and, due to bone resorption, the dental implant fails. In this article, a material property is determined using simulation in Ansys software and using Design of Experiments (DoE) Informed Deep Learning model, which is generated for minimum stress shielding. Ashby plot is used to determine the best possible dental implant material in which five materials are obtained. Titanium and ceramics are functional in medical fields, while steels are not functional due to biocompatibility issues. However, carbon fiber-reinforced polymer (CFRP) is biocompatible and excellent for dental implants, but needs manufacturing attention. Nickel alloys can also be used for dental implants, however, their biocompatibility and technical difficulties need to be studied.

The main aim of the paper is to critically analyze advanced technologies and innovations in the field of dentistry. The following databases are utilized to assess relevant studies: Google Scholar, PubMed, NCBI, Scopus, Elsevier, and Web of Science. The analysis involves the transition from a subtractive manufacturing technique to an additive manufacturing technique. Three-dimensional printing has become popular in designing prostheses. Moreover, the paper discusses the sintering distortion of zirconia prosthesis. Similarly, multi-layering of titanium implants decreased the chances of implant failure. In conclusion, the paper focuses on both the benefits and related drawbacks of the advancements in the field of dentistry.

In 2011, a clinical trial of total hip arthroplasty with Biolox DeltaŴ ceramic on ceramic started in Japan before the clinical approval. We report the result with 33 hips as a mid-term one. No wear-related complication and no dislocation occurred with the maximum of 13.2 years follow-up. After the trial and the approval, we have continued to use Biolox DeltaŴ ceramic on ceramic even for difficult cases and the bearing couple is now our first choice for young and active patients.

Purpose: The popularity of dental implants as a solution for missing teeth continues to grow, and so do the challenges associated with them. The intrusion of a natural tooth adjacent to a non-splinted dental implant is one such challenge recently observed in implant prostheses. In this comprehensive review, we delve into several potential theories that could elucidate the reasons behind tooth intrusion adjacent to a lone-standing dental implant.

Materials and method: The following search terms were used for the data search: (dental implant) AND (intrusion of natural tooth). Articles written only in the English language in PubMed, Scopus, and Embase databases ranging from 1987-2023 were scrutinized and only 6 articles were included in the review.

Results: Freestanding implants surrounding the intruded teeth are an uncommon occurrence that can be caused by extremely tight proximal contacts that are below the height of the contour of adjacent implants. Given the absence of a periodontal ligament in implants, their response to pressure is limited, resulting in minimal movement. However, the tooth in between them could still undergo apical intrusion. The achievement of proper proximal contact of prostheses is crucial when a natural tooth is located between implant-supported prostheses. To restore the tooth's proper contours and proximal contacts, it's suggested that the proximal contacts first be relieved. This will allow the tooth to erupt again. Clinicians need to be aware of this phenomenon and should be ready to treat it if it occurs.

Despite the generally high success rate of dental implant treatments, some complications may also occur. One of the most common mechanical problems is screw loosening of the abutment. This study aims to assess the impact of abutment type (original vs. non-original) and angle of abutment (angled vs. straight) on torque reduction and screw loosening under cyclic loading conditions. Thirty titanium implants were divided into three groups (n = 10): original straight abutments, non-original straight abutments, and original 15° angled abutments. Each implant, and its respective abutments, were embedded in prepared acrylic blocks and torqued to 25 N.cm. twice, with a 10-minute interval between each torque application. Reverse torque values (RTV) were evaluated before and after 500,000 cycles of cycling loading at 75 Hz with a 100 N load, using an electrical torque meter. Data analysis was conducted using SPSS software (version 21), employing descriptive statistics, ANOVA, and independent t-tests. After cyclic loading, the mean RTV was 18.41 ± 1.86 N.cm in the group of original straight abutments, 13.18 ± 1.75 N.cm in the group of non-original straight abutments, and 14.76 ± 1.04 N.cm in original 15° angled abutments. Statistically significant differences were observed in mean RTV between the two groups of original and non-original abutments as well as between angled and straight abutments (< 0.001). Original straight abutments demonstrated lower torque loss after cyclic loading compared with both non-original and 15° angled abutments. The findings suggest that using original straight abutments may have better outcomes in preventing screw loosening and ensuring proper performance in clinical settings. However, it is essential to thoughtfully evaluate alternative abutment types and angles when necessary.

Background: After implant installation, there is an immediate inflammatory reaction. Therefore, exploring the inflammatory mediators around different surface treated dental implants is essential for long term survival of implants. The goal of this study was to compare the levels of Tumor necrosis factor-α (TNF-α) and Interleukin-10 (IL-10) in patients with sandblasted acid-etched (SLA, SLActive) and anodized (TiUnite) dental implants.

Materials and methods: In this prospective clinical study, 78 patients who had undergone implant placement for missing single posterior tooth in mandible using sandblasted acid-etched and anodized surface dental implants from September 2020 to January 2021 were enrolled according to strict inclusion and exclusion criteria and were categorized into Group 1: SLA (n = 27), Group 2: SLActive (n = 26), Group 3: TiUnite (n = 25) based on the surface modification of the implants. Utilizing an ELISA kit, the levels of TNF-α and IL-10 were measured in the peri-implant crevicular fluid (PICF) at 3 months and 1-year intervals and then subjected to statistical analysis.

Results: Compared to groups 1 and 2, TNF-α was high and IL-10 level was less in implants from group 3 (p < 0.05). At baseline (p < 0.05) and the 1-year follow-up (p < 0.05), there was a statistically significant difference in TNF-α and IL-10 levels between the groups on pairwise comparison. Also, an intragroup comparison revealed that in all three groups, there was a statistically significant difference from the baseline (p < 0.05).

Conclusion: Higher TNF-α and lower IL-10 levels in the peri-implant crevicular fluid was observed among patients with anodized dental implants as compared to sandblasted acid-etched dental implants.

Lumbar interbody fusion is widely accepted as a useful tool for treating lumbar spinal pathology. Appropriately choosing the correct sized implant to decrease risk of subsidence, as well as choosing the correct approach for the vertebral level, maximizes chances of success. Interbody fusion allows for indirect decompression and can increase lumbar lordosis. There are multiple approaches to lumbar interbody fusion including: anterior, oblique, lateral, transforaminal and posterior. Patient specific and anatomic factors determine which is most appropriate.

A dental implant is a surgical fixture that is placed into the jawbone and allowed to fuse with the bone over the span of a few months. It acts as an alternative for a lacking teeth.The implant surgical guide comprises a teeth formed contour which stimulates natural teeth and prosthesis. Dental implants preserve the bone that results in loss of jaw height and appearance of aging.The prefabricated dental implant can be used to locate single implants or couple of implants in a continuous manner permitting verification of implant site, angulation and rotational positions prior to the implant placement and thereby allowing more esthetic, functional and stable prosthesis. CAD/CAM has been used for decades in restorative dentistry and have improved its software in implant dentistry. Surgical guide plays an important role in optimal positioning and angulation of implants. Surgical guides have not only reduced the chances of damage to anatomic landmarks but also increased the esthetic. Guided surgery is a complete treatment concept for diagnosis, treatment planning and placement of implants with high accuracy. The main aim of this review is to know the importance, accuracy and advantages of CAD/CAM surgical guide for virtual implant placement.

Dental implants offer a reliable solution for tooth replacement, but peri-implant diseases, especially peri-implantitis, jeopardize long-term success by causing inflammation and bone loss. Mechanical debridement is the primary treatment, though its effectiveness is limited by the complex implant surface. Adjunct therapies, particularly natural bioactive compounds, like thymoquinone from Nigella sativa, have shown promise in improving treatment outcomes due to their antimicrobial, anti-inflammatory, and regenerative properties. The aim of this study was to assess the clinical efficacy of locally applied thymoquinone gel combined with mechanical debridement in treating peri-implantitis. This prospective study included 40 participants with peri-implantitis, randomized into two groups. Group 1 received mechanical debridement alone, while Group 2 received debridement with 0.2% thymoquinone gel. Clinical parameters, including plaque index (PI), gingival index (GI), peri-implant probing depth (PPD), and clinical attachment level (CAL), were measured at baseline and after 3 months. Statistical analysis was performed using paired and independent t-tests. At the 3-month follow-up, Group 2 showed significantly better outcomes in PI (0.50 ± 0.20), GI (0.62 ± 0.11), PPD (3.02 ± 0.14 mm), and CAL (3.17 ± 0.31 mm) compared to Group 1 (p < 0.05). Thymoquinone gel as an adjunct to mechanical debridement significantly improves peri-implantitis management, offering a promising therapeutic option. Further studies with longer follow-up are needed to confirm its long-term effectiveness.

A novel approach to augmenting the osteogenic properties of nano-hydroxyapatite (nHA) is doping it with bioactive ions such as strontium (Sr) and zinc (Zn). The incorporation of Sr and Zn into the nano-hydroxyapatite structure enhances its bioactivity, providing a more favorable environment for osteogenesis. The aim of this review is to evaluate the osteogenic potential of Sr/Zn-doped nano-hydroxyapatite coatings on dental implants, focusing on their effects on osseointegration and bone regeneration. A comprehensive literature search was conducted to identify relevant studies. The following databases were systematically searched: PubMed, Scopus, Web of Science, Embase, and the Cochrane Library through September 2024. The search was designed to capture a wide range of studies from biomedical, clinical, and materials science. This systematic review initially identified 16 studies, with 6 excluded after screening for relevance. Of the 10 remaining, one was further excluded for not meeting criteria. Nine studies were included in the final analysis, out of which 4 were animal studies and 5 were in vitro studies but heterogeneity prevented a meta-analysis. Data extraction focused on study details, mechanisms, in vitro and in vivo results, and conclusions. Results indicated that Sr/ Zn-doped nHA plasma-sprayed coatings on titanium dental implants significantly enhance osteogenic potential. The collective evidence from the relevant studies shows that the benefits of Sr/Zn-doped HA materials for biomedical applications are multifaceted. They have demonstrated significant improvements in bioactivity, osseointegration, osteogenesis, antibacterial properties, and mechanical performance, making them promising candidates for a range of orthopedic, dental, and cranial implants.