Amber Mill H -LT/HT

Amber Mill H — HASS
Ceramic-based Hybrid Blocks

Amber Mill H is a ceramic-based hybrid CAD/CAM material combining fine crystalline ceramic particles with a polymer matrix, chemically bonded through a silane coupling interface. The hybrid structure is designed to combine ceramic mechanical properties with the machinability and handling characteristics of a polymer-based material.

Material Structure

Fine crystalline ceramic particles (20–100nm) are combined with glass and crystal phases, then integrated into a polymerized hybrid structure with a chemically bonded ceramic-polymer interface (Si–O–Si silicate bonding).

Optical Properties

Light Transmittance
Amber Mill H (HT) shows 35% light transmission through the fine crystalline ceramic layer, compared to 30% for a conventional hybrid block (High Translucency), based on internal modeling of incident light transmission and reflection.

Photopolymerization
Higher light transmittance supports higher initial adhesion during resin cement photopolymerization when light-curing, compared to CRN (composite resin nanoceramic) and PICN (polymer infiltrated ceramic network) reference materials.

Mechanical Properties

• Biaxial flexural strength: 190 MPa (ISO 6872) — compared to 170 MPa (CRN) and 140 MPa (PICN) in internal testing
• 3-point bending strength: 204 MPa (ISO 4049) — compared to 176 MPa (CRN) and 148 MPa (PICN)
• Indirect (diametral) tensile strength: 75.2 MPa — compared to 65.2 MPa (CRN) and 66.8 MPa (PICN), intended to help resist prosthesis dislodgement

Abrasion Resistance

Brushing abrasion testing per ISO/TR-14569-1:2007 showed lower weight loss for Amber Mill H relative to CRN and PICN reference materials across 50,000–200,000 brushing cycles, attributed to the small crystallite size of the ceramic phase.

Marginal Fit

Internal fitness-of-margin testing (lower value indicates better fit) measured 47.6μm for Amber Mill H versus 55.3μm for CRN, evaluated on inlay and premolar crown preparations.

Cementation — Two Pretreatment Options

Option 1 — Hydrofluoric Acid

1. After preparation, etch the inner surface with hydrofluoric acid (5% HF) for 60 seconds.
2. Wash thoroughly with water and air dry.
3. After silanization, air dry for 20 seconds. Use a bonding agent if necessary.
4. Bond with self-adhesive resin cement.

Option 2 — Sandblasting

1. Sandblast with 25–50μm alumina at 2 bar to create a rough surface.
2. Clean the inside with ethanol or an ultrasonic cleaner and dry thoroughly.
3. After silane treatment, air dry for 20 seconds. Use a bonding agent if necessary.
4. Bond with self-adhesive resin cement.

Tip: Avoid over-etching, as it can make the surface brittle. Self-cure or light-cure resin cement is recommended.

Preparation Guide

• Anterior Crown: incisal 1.5mm, mid-facial 1.2mm, cervical 1.0mm
• Inlay/Onlay: 1mm occlusal reduction, 1mm isthmus width
• Veneer: 0.6mm; Thin Veneer: 0.3mm

Indications

Inlays, Onlays, Veneers, Anterior Single Crowns, Premolar Single Crowns

Product Lineup

Available Shades

• HT (High Translucency): A1, A2, A3, B1
• LT (Low Translucency): W2, A1, A2, A3, A3.5, B1