## Case 1
### Surgical Stage  
The patient received 1 gr of amoxicillin one hour prior to surgery. At the time of surgery, he rinsed for 1 min with chlorhexidine solution 0.12% (Froiplak, Froika, Greece) and the area of interest was anesthetized locally with articaine 4%, epi 1:200k (Septanest, Greece). Step 1. A flap-less extraction was performed, taking care to prevent any damage to the soft and hard tissue (Scheme 1A, Figure 4) [21]. (A) Extraction socket presentation, where the red line represents the supra-periosteal pouch flap. (B) Three-dimensional implant positioning, where different locations of the implant axis can achieve the desired location of the platform and neck of the implant. (C) Fits abutment selection, where the shoulder is located 0.5 mm apically to the cervical gingival margin. (D) Membrane adaptation, being in contact with the internal wall of the socket. (E) Bone replacement graft BRG introduction into the available space present within the socket, occupying both the soft and hard tissue zones present below the abutment's shoulder. (F) Membrane adaptation and suturing with vertical mattress sutures. (G) Temporary prosthesis delivery, where the cervical margin is located supra-gingivally and comprises a 90' emergence angle in relation to the abutment. Figure 3: Pre-operative clinical conditions; buccal dislocation of tooth #1.1 is evident. Step 2. A partial thickness, supra-periosteal, trapezoidal-shaped pouch with a suitable blade on the buccal aspect only was created, without involving the adjacent papillae. The pouch was extended apically, further than the mucogingival junction, and laterally at least one root meso-distally, in order to increase the lateral dimensions of the base of the pouch and adequately mobilize the facial tissue. (Schemes 1B and 2A, Figure 4)  
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2. Supra-periosteal pouch design, demonstrating proper lateral and vertical extensions. The red lines demonstrate the pouch, while the yellow line demonstrates the mucogingival junction. 3. First abutment in place and membrane adaptation prior to BRG introduction. 4. Final relationship between first temporary prosthesis, abutment, and cervical gingival tissue. Step 3. The osteotomy as per the implant manufacturer's recommendation was generated and a narrow diameter implant was placed, which preferably comprised a stable conical connection and platform switching features ([PERSON], Megagen, South Korea) [22]. The implant had to be placed in a way that the platform and neck of the implant body presented at least 2 mm horizontal distance from the coronal part of the buccal plate. With regards to depth, the position the implant platform had to be at least 3 mm apical to the zenith of the future prosthesis [16; 23; 24; 25]. (Scheme 1B, Figure 5). Figure 4: Atraumatic extraction of affected tooth with the use of periodomes and generation of partial thickness pouch flap with a micro-blade. Step 4. The implant was connected to a temporary abutment comprising a shoulder with tulip shape and lateral dimensions that restrict it from being in touch with the buccal soft tissue [26]. The height of the shoulder had to be such that would allow its coronal margin to be located 0.5 mm apical to the existing free gingival margin. (Scheme 1C, Figure 5)  
Step 5. A resorbable membrane was utilized that could maintain its function for at least 12 weeks ([PERSON], Botiss, Germany), after properly trimming it, to adequately fit the lateral dimensions of the buccal side of the socket [27]. The membrane was placed within the socket, being in contact with the internal wall of the buccal plate (socket type I) and/or the perigsteum in case the buccal plate was partially or completely absent (socket type II). The coronal part of the membrane was to be extending coronally to the free gingival margin, providing a \"supra-socket\" portion. Two vertical cuts were performed to the supra-socket portion of the membrane only, so that the latter was separated in approximately three equal parts. (Schemes 1D and 2B, Figure 6). Step 6.