Utilization of computer-aided design/computer-aided manufacturing (CAD/CAM) rapidly increases in dental medicine. Making of computer-engineered complete denture is based on scanning of patient data, designing of prosthesis and milling or rapid prototyping. This is digital denture, term that includes innovative devices, software programmes and corresponding materials. Industrially polymerized cross-linked polymethyl methacrylate (PMMA) is the material used for fabrication of digital denture. The aim of this study is to analyze the different cross-linked PMMA used for fabrication of CAD/CAM complete denture.

Fabrication of temporary restorations is an essential part in dentistry and especially in oral implantology. Polymethyl methacrylate is used for a long time as material for temporary restorations and many improvements has been done to increase its properties, especially fracture resistance. Crosslinking and computer-assisted design/computer-assisted machining permit fabrication of long-term temporary restorations with flexural strength high enough and good modulus of elasticity that do not fracture easily under functional loads.

The present study assessed the retention forces corresponding to different telescopic systems used in removable prosthetic dentures. The telescopic systems were represented by Co–Cr alloy or zirconia-based primary crowns and Co–Cr secondary crowns. All crowns were manufactured using computer-aided design/computer-aided manufacturing technology (CAD/CAM). Two types of reference abutment teeth (upper canine and first upper molar) were selected in order to obtain the telescopic crowns and two taper angles—of 0° and 2°—were used for the design of the crowns. A number of 120 samples of telescopic crowns were obtained and subjected to mechanical tests, following a specific protocol, on a mechanical testing equipment. The retention of the telescopic systems was evaluated for different sets of cycles (up to 360), represented by movements that simulate the intraoral insertion and disinsertion of the telescopic systems. The present study highlights that the telescopic systems in which the primary crown is made of zirconia ceramics presents more advantages than those made of Co–Cr. All telescopic systems studied, highlighted that by modifying the taper angle from 0° to 2°, the retention forces have decreased, irrespective of the materials used for the fabrication of the primary crown, suggesting that by using a taper angle of 0°, which is known to be ideal, more efficient, and reliable prosthesis can be developed. Thus, even though the ceramic–metallic telescopic system exhibited the highest retention, all telescopic crowns evaluated registered values between 2–7 N, indicating that they are suitable for clinical use.

The purpose of this study was to detect the precision of inserting dental implants using 3 types of surgical guides on 3 groups of patients according to the degree of implantologist experience. In this study, 27 patients were taken, in 3 groups of 9 patients, who addressed to dental offices in which were implantologists with 1 year (group A), 6 years (group B) and 11 years (group C) of experience in surgery. Lot A, operated by a 1-year physician with experience in implantology, had the smallest deviation, demonstrating the increased attention that he had to the interventions. Comparing B and C lots, the smallest deviations were recorded for group C, operated by implantologist with greater experience in implantology. By comparing the deviations according to the type of surgical guide used, the smallest deviations at the apex and prosthetic platform were made in patients where the implants were inserted with a bone supported guide, followed by dental-gingival and mucosal guide. In terms of axis of implantation, the lowest values were recorded for the dental-gingival guide, followed by the bone and mucosal guide. The study has a number of limitations (low number of patients undergoing study, low dispensation period), which requires more extensive future studies to validate the results.

We evaluated the biocompatibility of four types of commercial alloys (two CoCr alloys and two NiCr alloys) used to make dental bridges. For the cell biology tests, a human osteosarcome type culture cell line MG63 (American Type Culture Collection) was used. Taking into account the results obtained, it can be said that the best results in terms of cell proliferation were observed for the Ni-Cr / Solibond N alloy closely followed by Co-Cr / Heraenium CE, then Co-Cr / Solibond C and Ni-Cr / Kera N, while cell viability tests revealed that the Co-Cr / Heraenium CE alloy exhibits the best biocompatibility, followed by Ni-Cr / Kera N, Co-Cr / Solibond C and Ni-Cr / Solibond N.