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Bibliographic Details
Main Author:	E. C. Martínez-Ceballos
Format:	Artículo científico
Language:	es
Published:	Sociedad Mexicana de Ciencia y Tecnología de Superficies y Materiales A.C. 2012
Subjects:	Física, Astronomía y Matemáticas Metacrilatos Polifosfacenos Resinas Dentales Encogimiento por Polimerización
Online Access:	https://www.redalyc.org/articulo.oa?id=94224536004
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Análisis del efecto del poli[bis(HEMA)-fosfaceno] y poli[(HEMA- g-PLA) fosfaceno] en la contracción de fotopolimerización de Bis-GMA:TEGDMA E. C. Martínez-Ceballos G. Martínez-Barrera O. Olea-Mejía Física, Astronomía y Matemáticas Metacrilatos Polifosfacenos Resinas Dentales Encogimiento por Polimerización Un problema de suma importancia en las resinas dentales poliméricas, es el efecto que causa su contracción cuando se polimeriza in-situ. Esta contracción disminuye la efectividad del implante ya que cuando la resina endurece y se adhiere al diente se generan fisuras y otros defectos que permiten la absorción de alimentos y la formación de caries. Esta contracción también disminuye las propiedades mecánicas de la resina implantada. Para disminuir la contracción por polimerización y evitar estos problemas, se puede modificar la estructura química de la resina y de otros componentes. En este trabajo se reportan las características de una resina fotopolimerizable de Bis-GMA/TEGDMA modificada con poli[bis(2-hidroxietilmetacrilato)-fosfaceno] y poli[bis(2-hidroxietilmetacrilato)-injerto-poli(ácido láctico)-fosfaceno] a diferentes concentraciones. Se analizó el intervalo de contracción mediante el método conocido como "bonded-disk". Los valores obtenidos para el composito varían entre 5.3 y 3.8%; mientras que la velocidad de contracción de polimerización se encontró entre 82.7 y 60.1 ¿m/mín. El análisis mostró que al incorporar una mayor cantidad de dobles ligaduras se obtiene un menor porcentaje de encogimiento. 2012 artículo científico 1665-3521 https://www.redalyc.org/articulo.oa?id=94224536004 es http://www.redalyc.org/revista.oa?id=942 Superficies y vacío application/pdf Sociedad Mexicana de Ciencia y Tecnología de Superficies y Materiales A.C. Superficies y vacío (México) Num.1 Vol.25

if (filemtime($filename) + $maxlifetime < time()) { unlink($filename); $count++; } } return $count; } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ protected function saveSession($sessId, $data): bool { $sessFile = $this->path . '/sess_' . $sessId; if ($handle = fopen($sessFile, 'w')) { $return = false; // Lock the file for exclusive access to avoid issues with multiple // processes writing session simultaneously: if (flock($handle, LOCK_EX)) { $return = fwrite($handle, $data); // Make sure that there's no trailing data by truncating the file to // the correct length: ftruncate($handle, strlen($data)); fflush($handle); flock($handle, LOCK_UN); } fclose($handle); if ($return !== false) { return true; } } // If we got this far, something went wrong with the file output... // It is tempting to throw an exception here, but this code is called // outside of the context of exception handling, so all we can do is // echo a message.

// Anecdotal testing Today and Yesterday seems to indicate destroy() // is called by the garbage collector and everything is good. // Something to keep in mind though. return 0; } /** * Write function that is called when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ public function write($sessId, $data): bool { if ($this->writesDisabled) { return true; } return $this->saveSession($sessId, $data); } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ abstract protected function saveSession($sessId, $data): bool; }

* * @return void */ public function writeClose() { // The assumption is that we're using PHP's ext/session. // session_write_close() will actually overwrite $_SESSION with an // empty array on completion -- which leads to a mismatch between what // is in the storage object and $_SESSION. To get around this, we // temporarily reset $_SESSION to an array, and then re-link it to // the storage object. // // Additionally, while you _can_ write to $_SESSION following a // session_write_close() operation, no changes made to it will be // flushed to the session handler. As such, we now mark the storage // object isImmutable. $storage = $this->getStorage(); if (! $storage->isImmutable()) { $_SESSION = $storage->toArray(true); session_write_close(); $storage->fromArray($_SESSION); $storage->markImmutable(); } } /** * Attempt to set the session name * * If the session has already been started, or if the name provided fails * validation, an exception will be raised. * * @param string $name * @return SessionManager * @throws Exception\InvalidArgumentException */ public function setName($name) { if ($this->sessionExists()) { throw new Exception\InvalidArgumentException( 'Cannot set session name after a session has already started'

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