Green State Instruments - Wagner Precision

Key Features

Engineered for the Green State

Pre-sintered zirconia presents a unique clinical challenge: the porous, chalk-like matrix must
be shaped precisely without inducing sub-surface cracking that can propagate during sintering.
Wagner Precision Green State Instruments use a specially calibrated abrasive bond that releases
cutting particles progressively, protecting the blank while maintaining accurate form.

Specially formulated abrasive for green (unsintered) zirconia blanks
Prevents chipping and micro-fractures in the porous matrix
Compatible with both wet and dry milling environments
Available in multiple shapes: cylinder, wheel, flame, and cone
Consistent abrasive distribution for uniform material removal
Reduced clogging even at lower coolant flow rates

Specifications

Parameter	Specification
Compatible Materials	Pre-sintered zirconia, PMMA (temporary protocols)
Shank Types	HP (Handpiece), FG (Friction Grip), RA (Right Angle)
Recommended Speed	10,000–20,000 RPM under water coolant
Available Shapes	Cylinder, Wheel, Flame, Cone
Coolant	Water coolant required; dry use compatible at reduced speed

Green State Instruments variety of shapes for pre-sintered zirconia

Available Shapes

Each shape is optimized for a specific stage of the green-state preparation workflow.

Cylinder — flat surface reduction and margin definition
Wheel — occlusal groove anatomy and interproximal shaping
Flame — cervical margin finishing and axial wall contouring
Cone — fossa detailing and fine anatomical refinement

Clinical Guidance

Best Practices for Green State Preparation

Proper technique in the green state is the single most important factor in preventing
sintering-induced cracks. Follow these protocol recommendations for optimal outcomes.

01

Maintain Coolant Flow

Run continuous water coolant at 10,000–20,000 RPM. Intermittent coolant causes thermal
differentials that initiate micro-fractures in the porous matrix.

02

Light, Consistent Pressure

Allow the abrasive to do the work. Excessive hand pressure compresses the porous structure
and creates sub-surface stress concentrations.

03

Inspect Before Sintering

Hold the contoured blank to light before loading the furnace. Any visible fracture lines in
the green state will widen significantly during the sintering cycle.

04

Follow Sintering Protocol

Use the zirconia manufacturer’s recommended sintering schedule. Over-sintering can reduce
translucency; under-sintering reduces hardness and strength.

Complete the Workflow

After Sintering — Finishing & Polishing

Green State Instruments prepare the blank. Once sintered, continue with Wagner Precision
instruments designed specifically for fully sintered zirconia.