A pulp-osseous implant (Ti-6Al-4V) for treating a mobilized periodontal tooth fractured after 15 years of service. The two pieces of implant divided in bone and pulp were extracted and washed by distilled water. The microstructures of the cross sections of both fractured pulp-osseous implant pieces were observed by SEM, and the compositions of the material attached to the implant surfaces were analyzed by EDAX. The fatigue source, slowly and fast developed fatigue stripe is presented were obviously showed on the cross sections of both parts. EDAX showed a higher percentage of Ca, P attached to the bone implant, as compared to that attached to the pulp implant. The fracture of implant in this case was due principally to metal fatigue, and partly caused by a lack of periodontal maintenance.