Journal of Prosthetic Dentistry最新文献

In radiotherapy for eyelid malignant tumors, a shield containing lead has typically been used to protect the eye and prevent complications such as cataracts, blindness, and eyesight deterioration associated with external irradiation. However, the fabrication of the shield involves complex steps, including making an impression of the eye. Recently, digital technologies such as 3-dimensional (3D) scanners have become popular in dentistry. In this report, a shield was fabricated using a dental computer-aided design and computer-aided manufacturing system based on 3D digital data of the orbital and ocular surface obtained with a 3D scanner. The individual parts of the shield were designed using a denture-design software program, milled from dental acrylic resin, assembled with the lead plate, and polished. Radiotherapy for an eyelid tumor was performed with the shield, and resulted in favorable tumor control. The application of digital technology to fabricate eye shields should benefit patients receiving radiotherapy for eyelid tumors.

Severe pathologic tooth migration (PTM) secondary to chronic periodontitis presents significant functional and esthetic challenges. This report describes a fully digital workflow for rehabilitating severe anterior PTM using additively manufactured (AM) monolithic zirconia post-and-core crowns. Through digital planning, precise crown resection and ferrule and post space preparation were completed before an intraoral scanner captured accurate digital scans. The 1-piece restorations provided excellent fit and adhesion, significantly improved the axial inclination of the clinical crowns, and yielded successful esthetic and functional outcomes at the 1-year follow-up.

Implant-supported prostheses have become a predictable and successful treatment for replacing missing teeth. Despite high success rates, screw loosening remains the most common mechanical complication. This dental technique describes a straightforward, conservative, and cost-effective technique using a sterile surgical glove to retrieve a damaged implant abutment screw safely. A small piece of sterile surgical glove is placed over the damaged screw head before engaging the screwdriver. The glove acts as an interface, increasing frictional contact between the screwdriver and screw head. This enhanced grip enables successful screw retrieval without additional equipment or risk to the implant.

A method of fabricating complete dentures with metal frameworks by combining 3-dimensional printing flasks and injection molding is described. Prefabricated artificial teeth and metal bases are integrated into the digital processing workflow of complete dentures.

Statement of problem: Denture hygiene is essential for oral health as acrylic resin roughness affects Candida albicans adhesion. Cleaning methods may alter surface properties, warranting further research to determine the most effective long-term approach.

Purpose: The aim of this in vitro study was to compare the effect of different denture cleaning procedures on the surface roughness and Candida adhesion of acrylic resins.

Material and methods: A total of 120 resin specimens were divided into 12 subgroups (n=10), including 3 materials, a heat-polymerized acrylic resin (Meliodent), an autopolymerized acrylic resin (Meliodent Rapid Repair), and a hard reline material (GC Reline Hard) and 4 cleaning methods, distilled water (control group), Corega alkaline peroxide-containing effervescent tablet, brushing, and electrolyzed water. Surface roughness values of the resin specimens were measured using a contact profilometer device before cleaning and after 7, 30, and 90 days. Candida adhesion was measured and colony forming units (CFU/mL) were assessed. Statistical analysis was performed by using 3-way ANOVA followed by the Bonferroni correction for the surface roughness data and the Kruskal-Wallis test for Candida colonization (α=.05).

Results: The surface roughness values of the 3 different acrylic resin materials decreased significantly 30 and 90 days after applying the denture cleaning procedures (P<.001). The denture cleaning procedure affected the surface roughness of heat-polymerized (P<.001) and autopolymerized resins after 90 days (P=.002). The surface roughness of the hard reline materials were affected by different cleaning procedures at all time intervals. Candida adhesion was significantly lower in all type of acrylic resin materials after immersion in alkaline peroxide-based cleansing tablets (P<.001).

Conclusions: According to the findings of this study, when evaluating surface roughness, the cleaning procedure with electrolyzed water may be an alternative to mechanical cleaning but should be improved in terms of removing Candida adhesion. Chemical cleaning with denture cleaning tablets was found to be optimal for long-term usage.