1. IntroductionAfter a tooth extraction, the dental socket experiences a natural process of physiological remodeling. Currently, there are no known methods to prevent these changes.1 Several factors, including the thickness of the buccal plate and the condition of the proximal bone influence the degree of changes observed in the socket.2Numerous techniques for bone regeneration have been developed and proposed. These techniques can be classified based on the type of barrier membrane used, the type of bone graft employed, or the method used to create a space for the graft material. Barrier membranes can be categorized as either resorbable or non-resorbable; however, their application falls under the broader term of guided bone regeneration (GBR).3 The distinction between types of bone grafts primarily relates to their source, which can be categorized as autogenous or non-autogenous.4 The creation of a conducive environment for osteogenic cell activity can be achieved by applying graft particles that possess adequate durability, serving as scaffolds. Alternatively, the implementation of new walls may be utilized to prevent the soft tissue collapse at the defect site.5According to the PASS principles, employing methods that facilitate the maintenance or creation of space for osteogenic cell growth can enhance the predictability of graft success.6 The application of graft particles in conjunction with flexible, resorbable membranes raises concerns regarding potential soft tissue collapse. Conversely, the use of rigid barriers, such as titanium mesh, necessitates the incorporation of bone particles to adequately fill the space beneath these structures.7The utilization of autogenous blocks effectively addresses both concerns associated with bone grafting. These blocks contain viable cellular components and osteogenic signals, while also providing the structural strength necessary to prevent soft tissue collapse. Consequently, the application of autogenous blocks remains the gold standard in the treatment of severe atrophy.8-10. Autogenous bone can be utilized in two main forms: as blocks9 or as plates11, which contribute to the formation of a structural box. Additionally, the gap beneath the plates or the spaces surrounding the blocks can be filled with autogenous chips or bone substitute particles, such as allograft particles. The regenerative capacity of the defect in question primarily influences the choice of technique for reconstructing bone defects. Bone defects can be categorized as critical or non-critical; as the nature of the defect progresses toward non-contained, the application of autogenous grafts becomes increasingly advantageous.12In cases of contained defects, the presence of additional bone walls enhances the support for the graft components and facilitates blood supply.13 This characteristic contributes to a more predictable success rate for the treatment. By incorporating autogenous bone blocks into severely atrophic ridges, we can create new bone walls, effectively transforming non-contained defects into contained defects.Autogenous block can be sourced both intraorally or extraorally, with the chin and posterior mandible representing the most prevalent intraoral sources.14, 15 Several techniques exist for harvesting autogenous blocks, including the use of surgical burs, piezosurgery and surgical saws, which are some of the most widely recognized methods.11 However, there is currently no consensus regarding the impact of the size and shape of the autogenous block, nor on the extent to which the block should cover the defect. This article describes a different method for harvesting a specific type of autogenous block using a trephine bur to implement the innovative osteogenic wall concept for reconstructing severely atrophic ridges. Additionally, the study examines the regenerative potential of bone defects in the context of discontinuous autogenous block fragments.