Impression and Registration Materials and Accessories
Impression and Registration Materials and Accessories CATEGORY DESCRIPTION
Accurate dental impressions are critical to achieving successful restorations.
Alginates, used for preliminary impressions for complete dentures and in endentulous patients with undercut ridges, come in powder form and are available in Type I fast-setting (1-2 minutes) and Type II normal setting (2-4.5 min) as bulk powder, pre-weighed packages, and color-changing (violet during mixing, pink when ready for seating, and white when set). They are typically easy to mix, manipulate and remove.
Vinyl polysiloxane (VPS) is a hydrophilic material that produces highly accurate dental and gingival impressions that resist distortion and tearing upon removal. Viscosities range from light body to heavy body/putty for bite impressions, and set times range from 2 to 5 minutes.
Available in regular (2:30 minute work/set time) and fast-set (1:30 minute work/set time), superhydrophilic impression materials’ superior wetting agents enhance hydrophilic properties for optimal accuracy. Excellent tear strength makes superhydrophilics effective in resisting deformation without irritating tissue.
Ancillary impression-related materials include stock trays for hydrocolloid impression materials (regular, edentulous and orthodontic style rim-locking and mesh) and custom trays (made from tray acrylic). Bite records/interocclusal registrations are divided into 3 categories: those for limited treatment segments (1-2 teeth), for a group of teeth (such as a quadrant), and for a single arch or both arches together.
