espanolLa remocion y reemplazo de las restauraciones durante la vida del paciente puede resultar en anchas y profundas cavidades, por lo que es necesario ser conservador cuando se requiere un reemplazo. Objetivo: Evaluar el incremento de volumen en cavidades clase I en molares humanos, posterior a la remocion de restauraciones de resina compuesta y amalgama dental por diferentes grupos de operadores. Materiales y metodos: Se seleccionaron 60 individuos pertenecientes a 4 grupos: Estudiantes de pregrado G1, estudiantes de postgrado G2, Profesores del Departamento de Odontologia Restauradora G3 y Odontologos Generales de Servicios Publicos G4. Cada operador respondio el Test de Conocimientos de Minima Intervencion en Odontologia (MIO), y luego removio dos restauraciones; una de resina (RC) y otra de amalgama (AD). Para la preparacion de las muestras se realizo una copia de la cara oclusal de los dientes con acrilico y se obtuvo un molde del diente sano. Posteriormente, se hizo la preparacion Oclusal (Clase I Black), se tomo el registro del volumen inicial con material de impresion polivinil siloxano aplicando la ecuacion v = m/d; se obturaron las cavidades y luego de la remocion se hizo un segundo registro para evaluar el incremento de volumen. Para el analisis se usaron modelos estadisticos descriptivos y modelos estadisticos inferenciales (ANOVA Bifactorial Univariante, MANOVA Bifactorial y relacion lineal). Resultados: al comparar conocimientos de MIO y grupos de operadores (ANOVA) no encontro diferencia estadisticamente significativa. El diferencial de volumen (MANOVA) no encontro diferencia significativa entre grupos de operadores y materiales. En el estudio de relacion lineal no existe relacion predictiva entre Puntaje del Test de MIO e incremento de volumen de las cavidades. Conclusion: En las condiciones que se realizo esta investigacion el incremento de volumen de las cavidades posterior al recambio no dependen de la experiencia individual de los diferentes grupos de operadores. EnglishThe removal and substitution of restorations during the patient's life can result in wide and deep cavities. Hence, it is necessary to be conservative when a substitution is required. Objective: the purpose of this research was to evaluate the increment of volume in class I cavities after removing composite and amalgam restorations by different groups of operators. Method: 60 people belonging to one of these groups were selected: undergraduate students G1, graduate students G2, professors of the department of restorative dentistry G3, and general dentist working in public services G4. Each operator answered the test of knowledge on Minimal Invasive Dentistry (MID), and the he/she removed two restorations: one of composite (C) and other of amalgam (DA). For the reparation of the sample teeth a copy of the occlusal surface with acrylic and a mold of the healthy tooth were obtained. Later, occlusal preparation was performed (Class I Black). Initial volume was registered with polivinil siloxane material and using the equation v=m/d. then, cavities were filled and a second register or volume was performed after remotion to evaluate volume increment. Inferential statistical tests were performed to analyze the data (1-way ANOVA, MANOVA and lineal regression). Results: when comparing knowledge about MID and groups of operators, the ANOVA did not show statistically significant differences. The MANOVA analysis indicated that differential volume was not statistically significantly different among the groups of operators and materials. The lineal regression analysis indicated that there is not predictive relationship between the test of MIO's scores and increment of volume in cavities. Conclusions: Under the conditions of the present study, cavities volume increment does not depend on operator's experience.