Purpose: To investigate the elemental composition, corrosion resistance, and mechanical properties of computer-aided design manufacturing (CAD-CAM) retainers versus conventional fixed (FRs).Methods: Eight different retainer wires were investigated.Energy dispersive X-ray spectroscopy was used to determine composition.Leakage analysed according ISO 10271:2020 guidelines.Hardness tested using Vickers method with a load 0.3 kg.The tensile force strength evaluated.Multiple comparisons among...

The relationship between orthodontic force and friction produced from an archwire brackets affects the sliding of wire in leveling stage. Objective: purpose this study was to evaluate a small esthetic nickel-titanium (Ni-Ti) wire. Material Methods: Five wires (three coated two plated) small, plain Ni-Ti (0.012 0.014 inches) were used. We performed three-point bending test according ISO 15841 drawing with dental arch model designed upper linguoversion lateral incisor (displacements 0.5, 1.0,...

Although orthodontic treatment improves dentoalveolar problems, the facial profile seldom changes because perioral muscles do not easily adapt to new morphological circumstances. We employed proprioceptive neuromuscular facilitation (PNF), which is training with added resisted movement motions such as lifting upper lip, lowering lower and sticking out tongue, The subjects were 40 adults an average age of 29.6 years. A series PNF exercises was performed three times per day for 1 month....

Orthodontic adhesive is often left on the tooth surface when a multibracket appliance debonded, and it difficult to remove because its colour similar that of tooth. If changed during debonding, residual could be more easily removed. This in vitro study evaluated usefulness mixed with small amount fluorescent dye for clinical orthodontics. Sixty-four metal brackets were bonded flattened bovine enamel surfaces using adhesives three concentrations (0.001, 0.002, 0.003 per cent) dye, shear bond...

We produced experimentally a new bonding material that consisted of mixture base resin (4-META/MMA-TBB adhesive) and thermoexpandable microcapsules for safe, easy debonding. Microcapsules in the would start expansion at 80°C, leading to remarkable decrease bond strength. Stainless steel brackets were bonded bovine permanent mandibular incisors using materials containing different contents. After thermal cycling or heating, shear strength was measured. Shear 30—40 wt% decreased about...

Objective: Pain is a problem during bracket removal, and more comfortable treatment needed. This study examined the association of pain with removal force required for ceramic brackets, compared metal plastic to determine which method resulted in less discomfort. Methodology: 81 subjects (mean age, 25.1 years; 25 males 56 females) were enrolled, from whom 1,235 brackets (407 ceramic, 432 plastic, 396 metal) removed. Measured teeth distinguished at six segments. was measured visual analogue...

We experimentally produced an easily debondable orthodontic adhesive (EDA) containing heat-expandable microcapsules. The purpose of this in vitro study was to evaluate the best condition when EDA used for ceramic brackets. Shear bond strengths were measured before and after heating compared statistically. Temperatures bracket base pulp wall also examined during heating. Bond 30 wt% 40 microcapsules 13.4 12.9 MPa, respectively decreased significantly 3.8 3.7 respectively, temperature...

This in vitro study evaluated the relationship between removal force and thickness of three orthodontic adhesives, namely, light- chemical-cured resin cements a resin-modified glass ionomer cement. The each adhesive was 50, 100, 150, or 200 µm, all adhesives were bonded on bovine incisors. Removal measured before (TC-0) after 1,000 thermal cycles (TC-1000), values compared. At TC-0, strengths for thicknesses 50 100 µm significantly lower than those 150 (P < 0.05). TC-1000, also µm. Superbond...

Although the polymerization reaction in light-cured orthodontic adhesive continues for some time after light irradiation, it is unclear whether insufficiently irradiated develops sufficient bond strength. This vitro study examined maturation of strength exposure a variety doses. Large metal brackets were bonded to enamel 288 bovine mandibular incisors by irradiation at two intensities (200 and 400 mW/cm2) three times (3, 5, 10 seconds) using adhesives (TB, OP, BOB). Shear strengths remnant...

Although there have been improvements in bracket systems precoated with adhesive, removal of adhesive remnants continues to be problematic. This study compared the hardness and maintainability other commercial adhesives. Knoop values were measured after light- or chemical-induced initial curing, immersion distilled water at 37°C for 24 h 1,000 10,000 thermal cycles h. Additionally, forces required move brackets by 0.5 mm during positioning, bonded bovine enamel examined field-emission...

LTC4, which enhances vascular permeability and promotes tissue edema, LTB4, is a potent chemotactic activating factor for leukocytes, were measured in rat brain after ischemia several time periods of reperfusion. Forebrain was induced by 4-vessel occlusion. LTC4 / LTB4 the RIA. We also studied effects 5-lipoxygenase inhibitor, AA-861 PAF antagonist, CV-3988 on concentrations. increased during 30 min forebrain (p < 0.001). After reperfusion, further, but at 15 reperfusion returned to control...

The purpose of this study was to examine the use electrolytic treatment, which can improve corrosion resistance Ni-Ti orthodontic wires, minimize adverse effects. Electrolytic treatment wires performed in a solution composed glycerol and lactic acid for 5, 15, or 30 min. anodic polarization test, three-point bending X-ray photoelectron spectroscopic analysis wire surface were explore an optimal condition. Breakdown potentials treated increased with increasing time higher obtained by...

Calcifications within old cerebral infarcts were demonstrated by CT in three patients who had suffered strokes probably due to emboli from a carotid or cardiac source. In two of them, calcifications not shown on at onset but first noted follow-up approximately 2 years later one, and 5 the other. third case large solitary calcification was found carried out 13 after onset. To our knowledge, these findings have been described previously.

This study investigated the effect of vertical position canine on changes in frictional/orthodontic (F/O) force ratio nickel-titanium (Ni-Ti) archwires during initial levelling phase orthodontic treatment. Frictional and forces were measured by using low-friction brackets Ni-Ti with three different cross-sectional sizes types. To simulate malocclusion (first premolar extraction case), upper right was displaced gingivally 1 to 3 mm inter-bracket distance between lateral incisor second set at...

This study investigated guidelines for placement of monocortical screws in the mandible, particularly mandibular canal. In this 35 patients, we used cone-beam computed tomography to determine distance from alveolar crest superior border canal (DMC) and shortest buccal lingual cortex (attaining distance) areas between premolars (premolar area), second premolar first molar (middle molars (molar area). The DMC values these were 16.55, 18.94, 16.58 mm, respectively, similar adults adolescents....

ABSTRACT Objectives To examine the torque moment that occurs between esthetic brackets and bendable alloy (stainless steel [SS], titanium-molybdenum [Ti-Mo], titanium-niobium [Ti-Nb]) wires. Materials Methods This study examined ceramic (CR), zirconium oxide (ZC), polycarbonate (PC), conventional metallic (MT) (upper, 0.018-inch 0.022-inch slots) combined with SS, Ti-Mo, Ti-Nb wires using elastic module ligation. The moments delivered by various wire bracket combinations were measured a...

Purpose: The aim of this study was to investigate the stability orthodontic anchor screws (OASs) in mid-palatal area according pre-drilling diameter.

Purpose: This study investigated the influence of professional mechanical tooth cleaning (PMTC) pastes on surface texture different subject materials.

Abstract Little information is available about enamel wear caused by zirconia brackets, an inadvertent side effect of orthodontic treatment. The purpose this study was to examine potential damage induced contact with brackets. Sliding and impact simulations were performed using bovine specimens positioned at a 25° slant zirconium ball determine behaviour. Different chewing patterns, tapping grinding, simulated. Specimens profiled confocal laser scanning microscopy, the mean maximum depth...

This study investigated the potential of BioUnion filler containing glass ionomer cement (GIC) to enhance properties enamel surrounding restorations, with a specific focus on effect hardness. The hardness bovine immersed in was measured using Vickers numbers. Following sliding and impact wear simulations, facets were examined confocal-laser-scanning microscopy scanning-electron microscopy. Surface further analyzed energy-dispersive X-ray spectroscopy diffraction (XRD). A significant increase...

This study investigates the moments generated when applying third-order bends to lingual brackets with different slot shapes and wires made of materials. Three types shapes: 0.018×0.018-inch square self-ligation bracket (AL-bracket); 0.018×0.025-inch (CL-bracket:); (ST-bracket). Wires three materials were measured. The torque value during application was measured using a gauge. AL-bracket had significantly larger moment than CL- ST-brackets at same angles. CL-bracket smallest for wire;...