Implant Impression Making: Take-Off Guide for Beginners

An extended guide pin for a direct implant impression.

A precise implant impression is essential for the passive fit of an implant superstructure. Although digital impressions are becoming more popular, conventional impression techniques are still frequently used. A direct (pick-up) open tray impression technique uses a guide pin. When an implant is deeply placed, the guide pin may not extend through the hole of the open tray. Therefore, wiping off...

A Metal-Acrylic Bar for Splinting Implant Impression Copings

Precise transfer of three-dimensional position of dental implants from oral cavity to the cast needs special considerations in impression making. It has been suggested to splint the copings by bars or acrylic resin material before making impression. Some problems regarding to polymerization shrinkage of acrylic resin have been reported. In this study, we describe a metalacrylic bar tha...

Absolute Beginners Guide to Neuroimaging Methods : fMRI

Functional magnetic resonance imaging (fMRI) is the primary means used to measure brain function non-invasively in humans, because of the advantages it offers in terms of high spatiotemporal resolution and localization as compared to other non-invasive modalities (e.g. EEG, MEG). Since its emergence about 20 years ago, it has rapidly evolved into the mainstay of functional neuroimaging for neur...

A Beginners Guide to Decentralised Data Fusion

A Beginners Guide to Dual-Quaternions

In this paper, we give a beginners guide to the practicality of using dual-quaternions to represent the rotations and translations in character-based hierarchies. Quaternions have proven themselves in many fields of science and computing as providing an unambiguous, un-cumbersome, computationally efficient method of representing rotational information. We hope after reading this paper the reade...