• extraction of the Posterior teeth will be done with minimally invasive technique using periotome.
• Then, the digital surgical guide will be placed, and will be checked the affinity of the reference window with other teeth accurately in the optimal position. The osteotomies will be prepared with a surgical-guided surgery kit through a digital surgical guide and drill direction will be ensured by radiographic taking. Implant fixture insertion will be performed through this digital surgical guide.
• All patients will receive a bone-level implant with varying diameter and length in each case. After implant placement, the operator will scan the surrounding gingiva with a scan body immediately for a post-extraction digital model.
• Then the spaces between the implant fixture and alveolar bone wall will be filled with locally harvested autogenous bone and xenograft grafting material (OsteoBiol Gen-Os, Sweden).

• an intraoral examination will be done and a digital impression will be taken by the intraoral scanner (MEDIT i500) for a pre-extraction digital model, and CBCT will be taken for prosthetic-driven planning.
• Once the treatment plan formulated, both STL (Standard Triangle Language) and DICOM (CBCT raw data) files format will be sent to produce the digital surgical guide with metal sleeve.
• Then, a customized PEEK healing abutment will be made mimicking the anatomical cervical contour and pseudo-CEJ will be made by merging the STL and DICOM digitally and the exterior surface of the healing abutment will be designed to resemble a tooth.
• Then, the technicians will mill the customized healing abutment digital design from a pre-milled 14 × 14 mm PEEK block (BioHPP, Bredent®, Bolzano, Italy) with a non-hex connection type, polished it, and sterilized it.
• The digital surgical guide with a metal sleeve will be back for scheduled patient implant surgery.

• an intraoral examination will be done and a digital impression will be taken by the intraoral scanner (MEDIT i500) for a pre-extraction digital model, and CBCT will be taken for prosthetic-driven planning.
• Once the treatment plan formulated, both STL (Standard Triangle Language) and DICOM (CBCT raw data) files format will be sent to produce the digital surgical guide with metal sleeve.
• Then, a customized PEEK healing abutment will be made mimicking the anatomical cervical contour and pseudo-CEJ will be made by merging the STL and DICOM digitally and the exterior surface of the healing abutment will be designed to resemble a tooth.
• Then, the technicians will mill the customized healing abutment digital design from a pre-milled 14 × 14 mm PEEK block (BioHPP, Bredent®, Bolzano, Italy) with a non-hex connection type, polished it, and sterilized it.
• The digital surgical guide with a metal sleeve will be back for scheduled patient implant surgery.

Gingival margin height will be measured from the highest gingival margin point in the buccal, lingual, mesial, and distal sides perpendicular to the platform plane (buccal height; BH, palatal/lingual height; LH, mesial height; MH and distal height; DH).

The contour width will be measured from the outer sur face on the buccal and lingual sides to the implant center on the platform plane (buccal width; BW and palatal/lingual width; LW).

Gingival volume will be measured on the gingiva above the platform plane for total gingival volume and separated with a mid-mesiodistal plane through the implant center for buccal and lingual gingival volume (total buccolingual volume; BLV, buccal volume; BV and lingual volume; LV).

The Functional Implant Prosthodontics Score will be measured through five variables in order to limit bias: (1) interproximal contact and papillae, (2) occlusion static and dynamic, (3) design color and contour, (4) mucosa quality and quantity, and (5) bone x-ray. A scoring scheme of 0-1-2 resulting in a maximum score of ten (5X2) per implant reconstruction.

is a psychometric response to pain scale which will be used in questionnaires through asking the patients about the occurrence of discomfort and postoperative pain Will be evaluated by questionnaire to assess perceived pain following crown insertion