Browsing by Subject "Teeth"

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    Dientes del Paleolítico Superior asturiano: estudio antropológico de los restos de la Cueva de las Caldas (Priorio, Asturias)
    (Ediciones Universidad de Salamanca, 2017) Haber Uriarte, María; López Lázaro, Sandra; Prehistoria, Arqueología, Historia Antigua, Historia Medieval y Ciencias y Técnicas Historiográficas
    A pesar de la relativa riqueza de restos óseos humanos asociados con las primeras etapas del Paleolítico Superior, se pone en evidencia la escasez de estudios detallados y específicos. De ahí la importancia del análisis de los dientes humanos de la Cueva de Las Caldas (Asturias), dos de ellos localizados en niveles solutrenses, y los otros dos de cronología magdaleniense. Al mismo tiempo, se actualiza la información que se tiene de los restos humanos recuperados en el Paleolítico superior cantábrico, fundamental para completar su imagen. ---------------------
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    Microleakage beneath brackets bonded with flowable materials: effect of thermocycling
    (Oxford University Press, 2009-03-31) Vicente Hernández, Ascensión; Ortiz Ruiz, Antonio José; Bravo González, Luis Alberto; Dermatología, Estomatología, Radiología y Medicina Física
    The purpose of this study was to evaluate the effects of thermocycling on microleakage beneath brackets bonded with an orthodontic composite and different flowable materials. Brackets were bonded to 200 bovine incisors divided into five groups: (1) Transbond XT, (2) X-Flow, (3) Dyract-Flow, (4) Admira-Flow, and (5) Beautiful-Flow. Half the teeth in each group were thermocycled. The specimens were dyed with 1 per cent methylene blue for 24 hours to determine the percentage of microleakage into the enamel–adhesive and adhesive–bracket interfaces using image analysis equipment. Data were analysed using the Kruskal–Wallis and Mann–Whitney U-tests (P < 0.05), applying Bonferroni correction when required (P < 0.005). Without thermocycling, microleakage at the enamel–adhesive interface was significantly greater for Admira-Flow than for X-Flow (P < 0.005). At the adhesive–bracket interface, there were no significant differences (P > .005). After thermocycling, microleakage of Beautiful-Flow at the enamel–adhesive interface was significantly less than for the other materials tested (P < .005), while at the adhesive–bracket interface, Admira-Flow and X-Flow showed significantly more microleakage than Beautiful-Flow and Transbond XT (P < 0.005). Analysis of the effect of thermocycling on each material showed that microleakage increased significantly at the enamel–adhesive interface with Transbond XT (P < 0.05), decreased with Beautiful-Flow (P < 0.05), increased significantly at both interfaces with X-Flow, but not to a statistically significant level with Dyract-Flow and Admira-Flow (P > 0.05). The giomer, Beautiful-Flow, demonstrated the best performance after thermocycling, while composite resins and, in particular, the flowables showed a poorer performance.
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    The effects of two soft drinks on bond strength, bracket microleakage, and adhesive remnant on intact and sealed enamel
    (Oxford University Press, 2010-07-14) Navarro Garre, Raul; Vicente Hernández, Ascensión; Ortiz Ruiz, Antonio José; Bravo González, Luis Alberto; Dermatología, Estomatología, Radiología y Medicina Física
    The purpose of this study was to evaluate the effects of Coca-Cola® and Schweppes® Limón on bond strength, adhesive remnant, and microleakage beneath brackets. One hundred and twenty upper central incisor brackets were bonded to bovine incisors and divided into three groups: (1) Control, (2) Coca-Cola®, and (3) Schweppes® Limón. The teeth were submerged in the drinks three times a day for 15 minutes over a 15 day period. Shear bond strength (SBS) was measured with a universal testing machine, and adhesive remnant evaluated using image analysis equipment. Microleakage at the enamel–adhesive and adhesive–bracket interfaces was determined using methylene blue. One hundred and eight teeth were used for scanning electron microscopy to determine the effect of the drinks on intact and sealed enamel. SBS and adhesive remnant data were analysed using the Kruskal–Wallis test (P < 0.05) and microleakage using the Kruskal–Wallis and Mann–Whitney tests applying Bonferroni correction (P < 0.017). No significant differences were found in SBS and adhesive remnant between the groups (P > 0.05). Microleakage at the enamel–adhesive interface for groups 2 and 3 was significantly greater than for group 1 (P < 0.017). At the adhesive–bracket interface, microleakage was significantly greater in group 2 than in group 1 (P < 0.017) while microleakage in group 3 did not differ significantly from either group 1 or 2 (P < 0.017). The drinks produced enamel erosion, loss of adhesive and microleakage. Coca-Cola® and Schweppes® Limón did not affect the SBS of brackets or the adhesive remnant.