Cohesion, cooperation, and the formation of positive bonds among group members are key processes that facilitate effective group functioning. Consequently, group leaders usually work to enhance the positive social bonds among group members to facilitate cooperation and group cohesion. The present research suggests, however, that leaders sometimes are motivated to generate divisions--not coopera...

The first examples of oxacalix[4]arenes and [1(4)]oxacyclophanes bearing 1,8-naphthyridine units are reported, and these systems function as molecular tweezers containing inner-cavity hydrogen bond acceptors.

AIM The objective of this article is to present a simple technique for stabilizing a lingual fixed retainer wire in place with good adaptation to the teeth surfaces and checking for occlusal interferences prior to the bonding procedure. BACKGROUND Bonding of an upper or lower fixed lingual retainer using stainless steel wires of different sizes and shapes is a common orthodontic procedure. Th...

Nanotechnology is gaining tremendous impetus due to its capability of modulating matter at smaller and smaller level which drastically changes the chemical, physical and mechanical properties of materials. Nanoparticles have been introduced into oral health care products with good potential to be extensively used for various dental applications. The purpose of this review is to highlight recent...

Synopsis The application of zirconia ceramics for the dental restorations and dental implants has increased. However the weak performance of the veneering porcelains and low adhesion to the zirconia framework were reported. In this study, the micro-structure, elemental distribution and crystal phase around the interface between zirconia and veneering porcelain were estimated using SEM-EDS (ener...

ESTHETIC REHABILITATION THROUGH CAD/CAM TECHNOLOGY-CASE REPORT (Abstract): With the progress of dental materials and techniques, CAD/CAM system curren tly allows the manufacture of high precision prosthetic restorations. Zirconia is an ideal base for porcelain because the bonding process between the zirconia and the porcelain is stronger than it is with porcelain and metal. This means that the ...

Our knowledge on the bonding mechanisms between the metal and ceramic parts of dental systems is very limited. This work tested the hypothesis that the details of the interface processes can be described in the framework of a chemical diffusion model. The development of interfacial phases was investigated by cross-sectional analytical transmission electron microscopy between a NiCr (Wiron 99) a...

Osseointegration has been defined as “a direct structural and functional connection between ordered, living bone and the surface of a load-carrying implant”. However, titanium and its alloys cannot directly bond to living bone after being implanted into the body. The osseointegration of titanium dental implants is critically dependent on the implant surface properties. Various surface modificat...

Three isomers of methacryloyloxyethyl naphthalenetricarboxylate anhydrides (MENTA-126, -236 and -184) were synthesized, and their adhesiveness to teeth and non-precious dental alloys was investigated. The MENTA resins initiated by TBB-O showed about 12-13MPa of the bond strength on treated enamel and 10-12.5MPa on treated dentin after 120 thermocycles, while, after the equal thermal cyclings, t...

To prevent infection in dental implants using photocatalytic activity under visible-light irradiation, the fabrication of Au-added TiO2 layers on Ti substrates and their antibacterial properties were studied. Pure Au Ti–(60, 40) mol%Au alloy films with thicknesses 10–47 nm sputtered onto Ti, followed by thermal oxidation air at 873 K for 1.8 ks to form layers. The against Escherichia coli, cyto...