Inverted Cone

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    Inverted Cone Burs – Precision Tools for Effective Cavity Preparation

    Inverted cone burs are essential rotary instruments in modern dentistry, designed specifically for cavity preparation, undercut creation, and amalgam restoration removal. Known for their unique shape and cutting precision, these burs allow dental professionals to create retentive features and flat floors in Class I and V cavity designs.

    At SurgiMac, our Inverted Cone Bur collection is engineered to support efficient material removal while maintaining optimal control, reducing chair time, and improving procedural accuracy.

    Key Benefits of Using Inverted Cone Burs

    • Efficient cutting edge for enamel and dentin
    • Ideal for Class I cavity prep and retention grooves
    • Available in multiple sizes including 33½, 34, 35, 37, and 169L
    • Durable carbide construction for long-lasting performance
    • Precision ground for smooth operation and minimal chatter

    Common Inverted Cone Bur Uses in Dentistry

    • Caries excavation and retentive groove formation
    • Flattening the floor of a cavity preparation
    • Amalgam removal and restoration adjustments
    • Accessing small areas or tight interproximal spaces
    • Creating undercuts for restorative stability

    Inverted Cone Bur Sizes

    Understanding inverted cone bur sizes is essential for matching the right bur to the specific procedure. Here are some common size types and their typical uses:

    Bur Size

    Use Case

    Head Diameter

    ISO Number

    33½

    Retentive undercuts in anterior restorations

    0.8 mm

    ISO 500 104 001 002

    34

    Small cavity preps

    1.0 mm

    ISO 500 104 002 002

    35

    Cavity floor smoothing

    1.2 mm

    ISO 500 104 003 002

    37

    Deeper grooves in posterior teeth

    1.4 mm

    ISO 500 104 005 002

    169L

    Amalgam removal, deep undercuts

    0.9 mm (long)

    ISO 500 104 169 010

    Why Choose SurgiMac Inverted Cone Burs?

    Dental professionals choose SurgiMac's inverted cone burs for consistent quality, smooth cutting performance, and wide availability of shapes and grits. Our burs are compatible with high-speed and low-speed handpieces, depending on the intended use.

    • Made with medical-grade tungsten carbide
    • Heat-treated for extended durability
    • Available in coarse, medium, and fine grit levels
    • Backed by SurgiMac's commitment to clinical excellence

    FAQs about Inverted Cone Burs in Dentistry

    What is the inverted cone bur used for?

    An inverted cone bur is primarily used in dentistry for creating retentive grooves, flattening the pulpal floor during Class I cavity preparations, and forming undercuts that help secure restorative materials such as amalgam. Its shape allows it to cut horizontally and vertically, which is ideal for gaining precise control in narrow or shallow cavities. Dentists often use inverted cone burs to remove caries and create clean, flat floors that improve restoration longevity. The bur’s durability also makes it useful for shaping tooth structure without excessive pressure or heat generation.

    What is the inverted cone approach?

    The inverted cone approach in restorative dentistry refers to the technique of using an inverted cone-shaped bur to create a cavity that has a wider internal base than the opening. This undercut configuration ensures that restorative materials stay securely in place, especially amalgam. The design of the inverted cone allows for better control and effective removal of decayed tissue while shaping the internal cavity to support mechanical retention. This approach is particularly useful in conservative dentistry, where preserving as much tooth structure as possible is critical for long-term success.

    What is a 169L bur used for?

    The 169L bur is a variation of the inverted cone bur with a longer cutting head, making it suitable for procedures requiring deeper penetration into the tooth structure. It is frequently used for amalgam removal, cavity access extension, and forming deeper retentive undercuts. Its slim profile allows access into tight or interproximal spaces, making it a go-to bur for both restorative and surgical cases. Due to its extended length, the 169L offers better visibility and reach without compromising precision, especially when used with a high-speed handpiece under magnification.

    Which bur is used for caries removal?

    Several burs can be used for caries removal, but inverted cone burs are a preferred choice when the goal is to remove decayed enamel and dentin while creating a retentive cavity shape. Other options include round burs for soft dentin and pear-shaped burs for broader areas. However, inverted cone burs excel in cases requiring flat floor formation and undercut creation, which are essential for securing direct restorations. Their sharp cutting edges help reduce vibration and patient discomfort, while their controlled cutting profile minimizes damage to healthy surrounding tissue.

    How does an inverted cone look?

    An inverted cone bur has a shape that resembles an upside-down cone. Unlike round or pear burs, its broad base is near the shaft, and the narrow tip is the cutting end, which allows for both lateral and downward cutting. This distinctive shape is ideal for creating retentive undercuts, smoothing cavity floors, and accessing difficult areas of the tooth. The bur typically has spiral flutes or diamond grit, depending on the material, and is often color-coded for easy identification. Its design supports high precision and minimal cutting resistance in restorative procedures.

    Which bur is used to remove amalgam?

    To remove amalgam restorations, dental professionals commonly use carbide burs such as 169L, #35, or fissure burs. Among these, inverted cone burs—particularly larger sizes—are favored for their efficient cross-cutting abilities and resistance to wear. Their strong structure and sharp blades allow for quick penetration of amalgam fillings while minimizing heat production and vibration. Choosing the correct bur helps protect adjacent tooth structure and ensures a clean removal that facilitates either replacement or further cavity preparation. Using water spray during the procedure further enhances safety and efficiency.

    Shop Trusted Inverted Cone Burs at SurgiMac

    Looking for dependable burs that cut cleanly, last longer, and support your workflow?

    Explore our full collection of Inverted Cone Burs and choose the perfect size and grit level for your procedures. Each bur is backed by SurgiMac's quality assurance, helping you deliver precise, efficient, and patient-friendly care every time.

    Ready to upgrade your restorative toolkit?                     
    Order now and experience the precision professionals trust.

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