Round End Taper Carbide Burs 12 blades

12-Blade Round End Taper Carbide Finishing Burs: 7642, 7664 and 7675

Eagle 12-blade round end taper carbide burs are FG carbide finishing burs for trimming and contouring composite restorations. Made from one-piece tungsten carbide, they come in three codes, 7642, 7664 and 7675, and each pack contains 5 burs.

The tapered body with a rounded tip follows margins and contours without leaving sharp internal lines. The straight blade setup has no spiral, so the bur does not pull into the composite, which gives you more control and a smoother surface.

Clinical Uses

• Trimming excess composite after curing
• Contouring and finishing composite restorations
• Smoothing chamfer margins and areas near the gingiva
• Removing excess cement or residual adhesive
• Preparing the surface for polishing

Code Guide

• 7642 – the smallest head in the range, for narrow areas and fine detail
• 7664 – mid-size head, an all-round choice for trimming and contouring
• 7675 – the largest head, for broader surfaces

Which Code for Which Area? (Typical Choices)

• Cervical margins and Class V: 7642, whose small rounded tip follows the gingival contour
• Facial and lingual surfaces, Class III and IV: 7664
• Broad buccal surfaces and larger restorations: 7675

Round End Taper vs Other Finishing Bur Shapes

• Round end taper: rounded tip and tapered sides - margins, chamfers and gingival areas without sharp lines
• Tapered (flat end): straight axial walls and flat surfaces
• Flame: pointed tip for occlusal anatomy, grooves and embrasures
• Bullet: rounded, blunt tip for broad convex surfaces

The round end taper is often the first carbide finishing bur clinicians reach for, because the rounded tip is forgiving near the gingiva and blends the restoration into the tooth.

How to Finish Composite With Carbide Finishing Burs

• Cure fully before you start trimming.
• Remove flash and excess at the margins with the 12-blade bur, taking care not to cut into the adjacent enamel.
• Contour the anatomy with light, intermittent strokes, keeping the bur moving.
• Check the occlusion and adjust.
• Refine with a 30-blade bur or a fine diamond if needed.
• Polish with composite polishers, discs or paste.

Run the FG bur in a high-speed handpiece at the speed recommended by the handpiece and bur manufacturer, and control heat with water spray or as your composite system recommends.

12-Blade vs 30-Blade Finishing Burs

Blade count controls how aggressive a carbide finishing bur is. A 12-blade bur removes material faster and is used for trimming and initial contouring. A 30-blade bur cuts more finely and is used for final finishing before polishing. Many clinicians use a 12-blade bur first, then a 30-blade bur or a polisher.

Carbide vs Diamond Finishing Burs

Carbide finishing burs cut with blades, giving a controlled, smooth cut on composite with good tactile feedback. Fine and super fine diamond finishing burs abrade instead and are often chosen for enamel and ceramic. Many clinicians keep both and choose by material.

Cleaning, Sterilization and Bur Life

Clean and sterilize before each use: pre-soak in a disinfectant suitable for carbide burs, clean ultrasonically in a bur holder, rinse, dry, pouch and autoclave following your clinic's protocol. Avoid cold sterilizing solutions and hydrogen peroxide, which can degrade tungsten carbide.

Tips and Common Mistakes

• Don't press hard - heavy pressure chips blades and heats the restoration.
• Don't hold the bur still in one spot; keep it moving.
• Replace a bur that chatters, clogs easily or no longer cuts cleanly.
• Keep composite residue off the blades by cleaning promptly after use.

Specifications

• Shape: round end taper
• Blades: 12, straight (no spiral)
• Shank: FG friction grip for high-speed handpieces
• Material: one-piece tungsten carbide
• Codes: 7642, 7664, 7675
• Pack size: 5 burs per pack
• Origin: made in Israel

Round end taper burs are a standard shape for composite finishing. For pointed finishing, see our flame carbide burs, or browse our full range of carbide burs.