The systematic use of dental implants in dentistry as a scientifically proven therapeutic approach occurred in the 1980s, while in the 1990s it strongly grew in terms of potential clinical applications. Nowadays, there is a great deal of evidence to support clinical treatment protocols for immediate implant placement in esthetic sites. The bone defects in the alveolar ridge have always been considered a major obstacle to clinical therapy with osseointegrated dental implants, especially in partially edentulous patients. The connections between the implants and abutments can basically be divided into two groups: external connections and internal connections. Cone beam computerized tomography (CBCT) has greatly improved the diagnosis and, consequently, the treatment plan in contemporary dentistry. The clinical decision making process can be influenced by several factors, such as tooth root fragility, occlusal pattern, masticatory forces, and the patient's age and ability to chew.