The better form of ridge will provide using wider implants that can have better abilities to with stand forces and to prevent alveolar bone loss as much as possible. Ridge expansion gained some popularity due to easiness compared to any other procedure that can gain bone. However, this treatment modality needs to be evaluated as compared to Mini Dental Implants (MDIs) over denture in thin mandibular ridge.

In mandibular edentulous patients having thin ridge, does the mini implant supported over denture, compared to the conventional implant supported over denture after bone expansion affect bone height around implants?

PICO

P: Completely edentulous Patients.

I: Mandibular overdenture supported by mini dental implant.

C: Mandibular overdenture supported by conventional implant diameter after bone expansion.

O: outcomes as follows:

Primary Outcome: Patient satisfaction, Questionnaire Visual analog scale (VAS), Measuring unit: Mm. (Geckili et al.

Secondary Outcome: Bone height change, Measuring device: DIGORA® X ray, Measuring unit: Mm.

Inclusion Criteria:

• Completely edentulous patients ranging from age 35 to 75 years
• Angle's Class I skeletal relationship
• Normal facial symmetry
• Cooperative patients
• Adequate inter-arch space not less than 12mm

Exclusion Criteria:

• Temporomandibular disorders
• Uncontrolled diabetes
• Bleeding disorders or anticoagulant therapy
• Flabby tissues or sharp mandibular residual ridge.
• Heavy smokers.
• Patient's with neuromuscular disorders
• Patients on chemotherapy or radiotherapy
• Severe psychiatric disorders
• Angle's class II and III skeletal relationship

The Principal investigator ,main supervisor and co-supervisor cannot be blinded as the implant placement technique for both groups will be different. In addition during assessment of 2ry outcome (bone height change) the x-ray will reveal the difference in the shape of both types of implants thus assessor couldn't be blind.