Córdoba, PaolaPaolaCórdobaTorres, CarlosCarlosTorresVélez, Claudia LilianaClaudia LilianaVélezGuzmán, Andrés FelipeHurtado Arango, ClaudiaPachón, Mónica2026-04-092026-04-092005-03-05https://repositorio.unicoc.edu.co/handle/SII-Unicoc/1923Objective: To determine the fracture resistance of root-weakened teeth restored with prefabricated fiberglass retainers and cast type IV gold cores, depending on the cementing agent. Method: A phase I experimental study was conducted on 42 root-weakened single-rooted premolars. Sampling was done by randomization into 6 experimental groups, with 7 teeth per group. Group I: fiberglass retainer cemented with resin-modified glass ionomer cement; Group II: fiberglass retainer cemented with dual-cure resin cement; Group III: fiberglass retainer cemented with chemically active self-curing resin cement. In Groups IV, V, and VI, the same cements were used, but with a cast type IV gold retainer previously fabricated with Duralay and prefabricated castable retainers. The variables were fracture resistance, fracture site, cement type, and retainer type. The inclusion criteria were: recently extracted premolars for orthodontic reasons, healthy, root length between 14 and 16 millimeters, single canal, incipient odontogenic caries, and minimal occlusal restorations. The exclusion criteria were: dehydrated premolars, premolars with accessory canals, and premolars with fractures. Each tooth was placed in an epoxy resin cube, the crown was cut leaving 2mm of splint, root canal treatment was performed with the crown down technique, 2/3 of the root canals were unobturated with the root weakening machine, 21 canals were prepared with burs from the fiberglass retainer system, the retainers were cemented, the core was rebuilt with resin reconstructor in the prefabricated retainers, then the crowns were waxed, cast, adapted and cemented, they were subjected to continuous compressive load in the Instron universal testing machine, an ANOVA statistical analysis was applied (p=0.05). Results. A difference in resistance was found between the cements (p=0.000) with averages of: group i 127.9171 n, group ii 48.2129 n, group iii 39.0429 n, group iv 79.9243 n, group v 38.0414 n, group vi 55.4000 n. Conclusions: No statistically significant differences in fracture resistance were found between the types of retainer, but differences were found between the types of cements, with the resin-modified glass ionomer cement used with a fiberglass retainer showing greater resistance.Objetivo: determinar la resistencia a la fractura de dientes debilitados radicularmente, restaurados con retenedores prefabricados en fibra de vidrio y núcleos colados en oro tipo IV, dependiendo del agente cementante. método: estudio experimental en fase i, el objeto de estudio fueron 42 premolares unirradiculares debilitados radicularmente, el muestreo fue por aleatorización con 6 grupos experimentales, 7 dientes por cada grupo a estudiar. grupo i retenedor en fibra de vidrio cementado con cemento de ionómero de vidrio modificado con resina, grupo II retenedor en fibra de vidrio cementado con cemento de resina dual, el grupo III retenedores en fibra de vidrio cementado con cemento de resina autopolimerizable químicamente activo, en los grupos IV, V y VI se utilizaron los mismos cementos, pero con retenedor colado en oro tipo IV previamente elaborado con duralay y retenedores calcinables prefabricados las variables fueron la resistencia a la fractura, el sitio de la fractura, el tipo de cemento y el tipo de retenedor. los criterios de inclusión fueron: premolares recién extraídos por indicación ortodóntica, sanos, longitud radicular entre 14 y 16 milímetros, un solo conducto, caries acúsales incipientes y restauraciones oclusales mínimas. los criterios de exclusión fueron: premolares deshidratados, con conductos accesorios y con fracturas. cada diente se colocó en un cubo de resina epóxica, se cortó la corona dejando 2 mm de férula, se realizó tratamiento de conducto con técnica crown down, se desobturad 2/3 radiculares con la máquina de debilitamiento radicular se prepararon 21 conductos con fresas del sistema de los retenedores en fibra de vidrio , se cementaron los retenedores , se reconstruye el mundo con reconstructor de resina en los retenedores prefabricados, después fueron enceradas , coladas, adaptadas y cementadas las coronas se sometieron a carga compresiva continua en la maquina universal de pruebas instron , se aplicó un análisis estadístico anova (p=0.05).46 pp.application/pdfesresistenciadebilitadosferularetenedorescementosfracturaInvestigación Bibliográfica Documentaltext::thesis::bachelor thesisTPR 00019resistanceweakenedsplintretainerscementsfractureopenAccess