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Mandibular atrophy is a universal disease characterized by extensive bone resorption due to edentulism and bone remodeling caused by it. Data released by Pesquisa Nacional de Saúde (PNS -- IBGE), in 2015, reveal that 16 million Brazilians are total edentulous, representing 11% of the population. Patient, female, 78 years old,, leucoderma, total edentulous, using lower overdenture on three anterior implants, was admitted to the Service, referring pain in the left side of the mandible. At the physical examination, no crepitation or displacement was observed. When analyzing a panoramic radiography, a fracture was noted in the left side of mandibular body, due to mandibular atrophy. The conduct applied to resolution of the case was printing of a mandibular prototype for pre-modeling a reconstructive 2.4mm locking plate, across the mandibular body and ramus. The surgery was performed at the hospital, through transcervical access. After exposure of the mandible, the pre-folded reconstruction plate was fixed. A mixture of iliac crest particulate graft, with particulate lyophilized bone graft was used in areas of larger mandibular resorption (bilateral mandibular body), enveloped by a collagenous membrane. Mandibular reconstruction, therefore, allowed the occlusal stability, preventing the risk of new spontaneous fractures, reestablishing function, aesthetics, and quality of life. [ABSTRACT FROM AUTHOR]