Journal of dental technology : the peer-reviewed publication of the National Association of Dental Laboratories最新文献

Part 1 of this article covered the applications, preparation requirements, and procedures through divesting for the pressable ceramic system. The O.U. (opacity units) system was also described, and how it relates to the proper selection of core material.

The indications for a unilateral partial denture would appear to be when there is a single posterior tooth missing, bound on both sides by usable abutments. Another consideration for a unilateral partial denture is that the patient does not want to restore the space with a fixed partial denture. One drawback to this treatment modality is that the prosthesis needs to be removed after each meal and cleaned. Other more important reasons for not making a 1-tooth removable partial denture is that it provides no cross-arch stabilization and there is the chance that it may be swallowed if it becomes dislodged. This clinical and laboratory report describes how this patient was treated.

All-ceramic restorations have been recognized and accepted as being esthetically superior to porcelain-fused-to-metal or all-cast restorations. However, gains in esthetics achieved with an all-ceramic crown often meant sacrifices in strength, fit or both. Recent developments in the pressed ceramic format continue to secure the pressed all-ceramic restoration as a viable alternative to porcelain-to-metal and all-cast restorations. This article focuses on the most updated techniques and considerations of this type of system and its effectiveness in providing esthetics, strength and fit through "technician-friendly" procedures, materials and equipment.

Because the arrangement of the remaining dentition may vary tremendously, the design of a removable partial denture is complicated with regard to function, esthetics, hygiene and oral comfort. Part One of this article, published in the January/February issue of JDT discussed how disassembling the RPD into its structural components and defining their functions could help the dental technician with RPD planning. Part two discusses the connection of partial frameworks to the remaining dentition and breaks down the components of a combination case.

The use of electrolysis as a means of forming a substructure for porcelain-fused-to-metal inlays, onlays, full crowns and even bridges has many advantages over the use of cast metal. Composed of pure gold deposited directly onto a duplicate die, electroformed copings have a high degree of biocompatibility and accuracy for increased durability (photograph 18). The internal surfaces of the coping match the exterior of the duplicate die exactly, and the thickness of the material deposited is a uniform 0.2mm. Marginal accuracy on completed restorations is on average 19 microns. The gold has the added advantage of burnishability. Recent developments in equipment and technique have placed this form of substructure well within the scope of consideration for most ceramics laboratories.

Because the arrangement of the remaining dentition may vary tremendously, the design of a removable partial denture is complicated with regard to function, esthetics, hygiene and oral comfort. Part One of this article will discuss how disassembling the RPD into its structural components and defining their functions will help the dental technician with RPD planning. Part Two will break down the components of a combination case using the same systematic approach.