This article has as its objective to describe the transformations of pedagogical practices and pedagogical use of argumentation in teachers, with the support of curricular materials technologically supported by a pilot software named argumentApp. We used a qualitative methodology, involving the study of four cases of teachers and students at four schools in the Metropolitan Region in Chile. The data, collected by observation of classes and in-depth interviews, indicate that teachers incorporated collaborative practices in the classroom and produced a higher number of argument questions. We observed differences in their ways of appropriating the technological tool and in their contribution to the in-class learning dynamic. The results are discussed considering the contribution of professional development interventions situated in a concrete context of practice and the dimensions which help construct an intervention which favors dialogic teaching.