Take 1™ Advanced™

Premature Set

• Abrupt change from heavy to light-body material
• Muted detail around margin

• Set time of wash/tray material not synched
• Exceeded working time of material

• Begin mix of heavy and light viscosity concurrently
• Verify set times for heavy and light viscosities match
• Observe working time of materials

Deformation/Dimensional Change

• Crowns too tall/short
• Open contacts
• Crown will not seat

• Insufficient mix of material
• Impression removed too early
• Tray movement after seating
• Insufficient material elasticity
• Fluid absorption during disinfection process

• Verify material is adequately mixed before seating and completely set prior to removal
• Use passive force to maintain tray position when using open-bite technique
• Verify no tooth contact with tray sides or impingement in closed-bite technique
• Choose material with adequate elasticity
• Follow disinfection protocol carefully

Tearing at Margin

• Visible tears at margin
• Lack of flash extending apically around entire preparation

• Material has insufficient tear strength
• Presence of severe undercuts
• Insufficient sulcular expansion

• Use material with adequate tear strength
• Consider blocking out undercuts, especially in cases with gingival recession
• Ensure at least .5 mm sulcular expansion

Surface Inhibition or “Non-set”

• Unset or mottled surface around preparation
• Lack of detail
• Shiny/wet appearance

• Contamination due to latex gloves; direct contact with material or residue left on teeth
• Contamination due to temporary materials or composite
• Expired material or exceeded material shelf life

• Use latex-free gloves when handling VPS material
• Rinse preparation area thoroughly after using other restorative materials
• Use automated mixing device to minimize exposure to contaminants
• Do not use expired material

Poor model detail

• Small bubbles/indentations in cast
• Powdery cusps

• Release of hydrogen gas from VPS impression after pouring cast
• Tooth contact with mesh lining of closed-bite impression tray

• Follow manufacturer instructions regarding any delays for pouring models after taking impression
• Place cotton roll on contra-lateral side when using closed-bite trays to prevent direct tooth contact with tray; this prevents water from leaching through tray after cast has been poured

Voids in wash material

• Visible voids in wash material around tooth preparation

• Bubbles incorporated into material during mixing or loading syringe
• Bubbles incorporated while syringing material intraorally

• Use automix systems
• Syringe material intraorally in continuous stream around each preparation; do not lift syringe tip from material

Insufficient or excessive compression

• Insufficient: wash material flows away from preparation area
• Excessive: wash material displaced from preparation area; “burn through”

• Use tray viscosity material with greater compressive force, or use custom tray
• Use tray material with lower viscosity to avoid displacing wash material

Incomplete margin

• Voids or “jumps” on margin

• Inadequate tissue management
• Contamination from intraoral fluids
• Insufficient compression of wash material

• Use Expasyl™ retraction paste to open sulcus and help maintain dry field
• Use hydrophilic wash material
• Select tray viscosity with adequate compression

Tooth contact with tray

• Visible impingement

• Incorrect size tray
• Tray seating not aligned with dentition

• Verify tray has enough room for 2 mm of impression material between tooth and tray walls