Reabilitação de mandíbula severamente reabsorvida com implantes curtos e prótese fixa total parafusada / Rehabilitation of severely resorbed mandible with short dental implants and a total fixed, screw-retained prosthesis

Pacientes com atrofia óssea avançada dos maxilares ainda consistem em um desafio para a reabilitação oral. A literatura sugere várias opções de tratamento e cabe ao profissional escolher qual é a mais indicada conforme as condições psicossomáticas e financeiras do paciente. Este artigo relata e discute, embasado na literatura pertinente, o caso de uma paciente portadora das características ósseas acima, onde o tratamento escolhido foi a confecção de uma prótese total superior convencional e uma prótese fixa inferior suportada por implantes curtos com minipilares angulados devido à perda óssea vertical severa e ao prognatismo mandibular.

Patients with advanced bone jaw atrophy still consist of a challenge for oral rehabilitation. The literature suggests several treatment options, and clinicians must choose which is the most appropriate according to financial and psychological conditions. This article reports and discusses, based on relevant literature, the case of a patient with those characteristics, where the treatment of choice was the construction of a conventional denture and a lower fixed screw-retained, implant-supported prosthesis with short implants and mini-abutments due to the severe vertical bone loss and mandibular prognathism

Fracture of abutment screw supporting a cemented implant-retained prosthesis with external hexagon connection: a case report with sem evaluation

One of the causes of implant failures in cemented implant-retained prostheses is the fracture of abutment screw or UCLA abutment. This article reports a case of simultaneous fracture of two UCLA abutments screws occurring in an implant-supported prosthesis placed in the mandibular molar region. The fractured structures were examined under scanning electron microscopy to investigate the probable causes of the failure, which were not related to failures on materials or fabrication of the screws, but rather were due to shear forces. The misfit in cemented prostheses may be the most likely cause of shear force generation.