Effect of prefabricated auxiliary devices in different optical properties and shapes on the accuracy of intraoral scanning of the edentulous arch with multiple implants: An in-vitro study.

Objectives: This study aimed to evaluate the impact of prefabricated auxiliary devices (PADs) in different optical properties and shapes on the accuracy of digital implant impressions.

Methods: An edentulous maxillary all-on-4 master model was fabricated. PADs were 3D-printed in different resin materials (Grey, Translucent, White, Yellow) and shapes (Cuboid, Cylinder, Sphere) using a 3D printer (AccuFab-C1s, 3DShining, Hangzhou, China).

The use of average Pavlov ratio to predict the risk of post operative upper limb palsy after posterior cervical decompression.

Study Design: A retrospective study was conducted to study the post operative upper limb palsy after laminoplasty for cervical myelopathy.

Objective: To identify a reliable and simple preoperative radiological parameter in predicting the risk of post operative upper limb palsy.

Background: Post operative upper limb palsy is one of the causes of patient dissatisfaction after surgery.