Accuracy of Trephination-based Versus Drilling-based Guided Dental Implant Placement

This study will be conducted to compare the accuracy of implant placement using the guided trephination drilling protocol and the guided conventional drilling protocol.

the patients with a single missing tooth will be assigned to one group ( trephination drilling / conventional drilling ).the preoperative virtual planning and fabrication of a surgical guide will be made for each patient. after implant placement according to each group, postoperative (CBCT ) will be performed to compare the virtual implant position and the actual implant position.

Inclusion criteria

• Single missing maxillary premolar or molar tooth.
• Both genders aged from 20-50 years.
• Patients should be systematically free from any disease as according to Cornell Medical Index-Health Questionnaire. (Pendleton et al,.2004)
• Mesio-distal space ≥ 7 mm.
• Bone width in bucco-lingual direction ≥ 6 mm.
• Uniform alveolar ridge with no undercuts.
• Present mesial and distal sound neighboring teeth.
• At least 4 natural remaining teeth on the same arch.
• Mouth opening at least 30 mm.

Exclusion criteria

• Pregnant and lactating females. 2) Smokers. 3) Poor oral hygiene. 4) Vulnerable groups of patients' e.g. (handicapped patients).

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