Comparison of spring characteristics of titanium-molybdenum alloy and stainless steel.

[This retracts the article on p. 84 in vol. 9, PMID: 28149469.

Comparison of spring characteristics of titanium-molybdenum alloy and stainless steel.

Background: Titanium-molybdenum alloy (TMA) and stainless steel (SS) wires are commonly used in orthodontics as arch-wires for tooth movement. However, plastic deformation phenomenon in these arch-wires seems to be a major concern among orthodontists. This study aimed to compare the mechanical properties of TMA and SS wires with different dimensions.

The effect of an acidic food-simulating environment on the shear bond strength of self-ligating brackets with different base designs.

Aim. This study aims to evaluate the effect of acidic food simulant and (acetic acid 3%) on the shear bond strength (SBS) and adhesive remnant index (ARI) scores of one conventional and three different self-ligating brackets with different base designs. Materials and Methods.

Effect of thermocycling on nickel release from orthodontic arch wires: an in vitro study.

The amount of daily intake of metals from orthodontic appliances over time is a matter of great concern. Nickel results in one of the most common metal-induced allergic contact dermatitis in humans; it produces more allergic reactions than all the other metals combined together. The purpose of this study was to evaluate the effects of thermocycling on the nickel release from orthodontic arch wires stored in artificial saliva with different pH values.

The effect of social stress on salivary trace elements.

Social stress can alter the saliva in favor of metabolism of trace elements. This study aimed to assess the effect of social stress on salivary copper (Cu), zinc (Zn), manganese (Mn), and iron (Fe) contents in dental students before and after a comprehensive English test. Twelve students with an average age of 27 years were selected from three dental schools.

The effects of face mask and tongue plate on maxillary deficiency in growing patients: a randomized clinical trial.

Objective: The purpose of this randomized clinical trial was to compare the effects of facemask and tongue plate therapy in the treatment of class III malocclusion associated with maxillary deficiency in growing patients.

Design: Prospective, randomized clinical trial.

Setting: Department of Orthodontics, SB University of Medical Sciences Dental School, Tehran, Iran.

Assessing the amount of interdental bone in posterior areas of the mandible for placing orthodontic mini-implants.

Objective : The aim of this study was to assess the amount of interdental bone in posterior areas of the mandible for placing orthodontic mini-implants to provide and control anchorage in orthodontic treatment. Materials and Methods : The amount of interdental bone in areas between the second premolars and first molars, first and second molars on the right and left sides of the mandible were determined in fifty patients by RVG using periapical radiographs. The images were assessed using Cygnus Media Software to determine the mesio-distal width of the interdental bone, starting at the crest of the alveolar bone (2 mm below the CEJ) every one millimeter up to 12 mm from the CEJ.

Back-scattered and secondary electron images of scanning electron microscopy in dentistry: a new method for surface analysis.

Objective: A scanning electron microscope (SEM) is a popular tool for investigating the root canal surface to visualize dentinal tubules, the smear layer and various root canal filling materials in endodontics. Most of the SEM micrographs taken in endodontic research are in secondary electrons (SE) mode, in which the topographic view of a subject can be demonstrated without giving any information about the real structure. Back-scattered electron (BSE) images are also used, which reveal some information about the internal structure while providing no topographic details.