Hader Bar
The hader bar is a type of dental attachment, specifically a bar attachment, used to retain and stabilize removable partial dentures or overdentures.
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Restoration Details
Indications
1. Edentulous or partially edentulous arches
2. Overdentures supported by 2–4 implants
3. Patients with limited interocclusal space
4. Patients seeking removable, stable overdenture
5. For splinting implants and distributing occlusal stress
6. Patients with poor stability of conventional dentures
Material Composition
1. Bar: Co-Cr alloy (cobalt-chromium) or titanium alloy
2. Housing: Stainless steel
3. Retention insert: High-performance plastic / nylon resin
Preparation Tips
1. Ensure parallelism of abutments/implants.
2. Maintain adequate interocclusal space (≥6–7 mm).
3. Use accurate impressions and verified occlusal records.
4. Design bar with proper height, width and contour.
5. Avoid sharp undercuts; ensure smooth finishing.
6. Allow proper space for clip housing and acrylic.
7. Verify passive fit before final processing.
Strength Characteristics (MPa)
1. Co-Cr bar: Tensile strength 850–1050 MPa, yield strength 600–700 MPa, modulus 200–220 GPa
2. Ti alloy bar: Tensile strength 895–930 MPa, modulus 110–120 GPa
3. Retention force of clip: 600–1000 g
4. High rigidity, fracture resistance and corrosion resistance