Influence of customized over-scan body rings on the intraoral scanning effectiveness of a multiple implant edentulous mandibular model.

Objectives: To evaluate the effectiveness of intraoral scanning with identical multiple implant scan bodies (ISB) using customized over scan body rings (COR) as an auxiliary system.

Methods: Six printed rings with different diameters and shapes were attached at different levels to each identical ISB of an edentulous mandibular master model. The master model was scanned using an intraoral scanner (Primescan CEREC) until valid digital models for the COR group (n=10) and for the unmodified ISB (UN) group (n=10) were obtained.

Sensory innervation of the human palmar aponeurosis in healthy individuals and patients with palmar fibromatosis.

The human palmar aponeurosis is involved in hand proprioception, and it contains different sensory corpuscle morphotypes that serve this role. In palmar fibromatosis (classically referred to as Dupuytren's disease), the palmar aponeurosis undergoes fibrous structural changes that, presumably, also affect the nervous system, causing altered perception. We analysed the various sensory nerve formation morphotypes in the palmar aponeuroses of healthy subjects and patients with palmar fibromatosis.

Accuracy of digitization obtained from scannable and nonscannable elastomeric impression materials.

Statement Of Problem: Elastomeric impression materials have been marketed for optimizing direct digital acquisition without requiring a stone cast. The trueness and precision of the digitization of these new elastomeric impression materials are unclear.

Purpose: The purpose of this in vitro study was to compare the trueness and precision of digital dental casts obtained from the direct digitization of 2 types of vinylsiloxanether (VSXE) impression materials by using a laboratory laser scanner.