⚕️ Precision Surgical Instruments
    🦷 Advanced Osseodensification Technology
    ✅ Enhanced Implant Stability
    🔬 Clinically Engineered Solutions
    💼 Trusted by Professionals
    🌍 Serving Global Dental Markets

    ⚕️ Precision Surgical Instruments
    🦷 Advanced Osseodensification Technology
    ✅ Enhanced Implant Stability
    🔬 Clinically Engineered Solutions
    💼 Trusted by Professionals
    🌍 Serving Global Dental Markets



    Densah Bur
    Densah Burs

    Precision drilling tools




    Short Burs
    Short Burs

    Designed for tight spaces




    Surgical Kit
    Surgical Kit

    Complete implant solution




    Custom Kit
    Custom Kit

    Build your own setup




    Pouch System
    Kit Pouch

    Compact & organized



    Featured Products


    -59%HotOsseodensification Dental Implant Surgical Kit


    Compare

    Osseodensification Dental Implant Surgical Kit

    , ,
    Original price was: $400.00.Current price is: $165.00.

    • Dental implant surgery

    • Osseodensification implant procedures

    • Implant placement in soft bone

    • Advanced implantology practices



    Add to wishlist

    Add to cart
    Quick view

    -40%HotOsseodensification Crestal Bur Kit – Regular Series




    Compare

    Advanced Osseodensification Bur Kit Comparable to Versah System

    , ,
    Original price was: $250.00.Current price is: $150.00.
    Osseodensification Burs Kit
    hese burs use external irrigation and are compatible with all available sized implants up to 6.0 leaving you with the flexibility to do more with less. The proprietary flute design allows the bur to work in 2 modes:
    Mode #1 : Cutting Mode (Clockwise rotation) at 800-1500 RPMs
    Mode# 2 : Densifying Mode (Counterclockwise rotation) at 800-1500 RPMs
    Details:
    2x Parallel Pin
    2x Parallel Pin XL
    1x Ratchet Extender
    1x Parallel Pin


    Add to wishlist

    Add to cart
    Quick view

    -55%New Universal Densah Osseodensification Bur Kit




    Compare

    New Universal Densah Osseodensification Complete Burs Kit

    , ,
    Original price was: $400.00.Current price is: $180.00.
    Densah Bur Technology is the Innovation that makes Osseodensification Possible. Instantly Familiar Yet Dramatically Different.
    Total Universal Densah Bur Kit.
    The Universal Densah Bur Kit including Short Densah Burs is the best value for your practice if you use multiple implant systems. These burs are externally irrigated and are compatible with all available sized implants up to 6.0mm diameter, providing you with the flexibility to do more with less. The proprietary flute design allows the bur to work in 2 modes:
    Cutting Mode (Clockwise rotation) at 1000 RPMs
    Densifying Mode (Counterclockwise rotation) at 1000 RPMs.


    Add to wishlist

    Add to cart
    Quick view

    -29%




    Compare

    New Universal Osseodensification Densah Versah Multi Drills

    ,
    Original price was: $425.00.Current price is: $300.00.
    Universal Densah Burs Kit of 56 Pcs Complete Professional Kit
    Details:
    Versah Burs Drill Sizes:
    (1525) 2.0 mm,(2535) 3.0 mm, (3545) 4.0 mm, (4555) 5.0 mm.
    (1828) 2.3 mm,(2838) 3.3 mm, (3848) 4.3 mm, (4858) 5.3 mm.
    (2228) 2.5 mm,(3238) 3.5 mm, (4248) 4.5 mm, (5258) 5.5 mm.
    Short Tapered Pilot Drill : 1.6mm
    Burs are externally irrigated
    Drill speeds of 800-1500 Rmp.
    Versah Short Drills Sizes:
    Short Tapered Pilot Drill : (1.8mm)
    DENSAH Bur-G3 VT1525 – Short  (2.0mm)
    DENSAH Bur-G3 VT1828 – Short (2.3mm)
    DENSAH Bur-G3 VT2535  – Short (3.0mm)
    DENSAH Bur-G3 VT2838 – Short (3.3mm)
    DENSAH Bur-G3 VT3545 – Short (4.0mm)
    DENSAH Bur-G3 VT3848 – Short  (4.3mm)
    Membrane Sinus Lift Lateral Reamer Drill Sizes:
    Ø3.3mm Membrane Sinus Lift Lateral Reamer Drill ,
    Ø3.7mm Membrane Sinus Lift Lateral Reamer Drill ,
    Ø3.3mm (Head Size) Membrane Sinus Lift Lateral Reamer Drill
    Ø8.0 Membrane Sinus Lift Lateral Reamer Drill
    Ø6.0Membrane Sinus Lift Lateral Reamer Drill
    Ø8.0mm Lateral Approach Cutter Membrane
    Dental Implant 13 Long & 7 Short Dental implant burs kit With 4 Parallel Pins.
    The Longer Terphine Drills,
    ⌀ 3.0mm
    ⌀ 4.0mm
    ⌀ 5.0mm
    ⌀ 6.0mm
    ⌀ 7.0mm
    Bone Expander:
    1 x Wretched Extender
    5 x Bone Expander Screws
    1 x Ratchet Wrench (4.0mm)
    2 x Parallel Pins
    2 x SAW Disks (7.0mm, 10.0mm)
    1 x Drill Guide
    1 x Hand Driver
    Mini Drivers Hex Screws Drivers 6 Pcs
    6 x Long & Short Hex Screw Drivers
    Why Choose Us?
    Competitive price and superior quality- Accept trial order and wholesale, sample available.
    How Our Products are Premium?
    Raw material to Final packed Products Our Staff keep Eyes on every Detail precisely and Make sure that Our Products are What We Claim them to Be and that's “Premium”.

    FAQ
    Q1.What is your terms of packing?
    A: Generally, we pack our goods in pp bags and cartons.
    Q2. What is your terms of payment?
    A: 100% as deposit before delivery.
    Q3.What is your time of dispatching product?
    A: 1-2 Business days. We ship every day Monday – Saturday.  Usually it will take, UK/Europe/USA in 4-6 days. Rest of the world 6-7 days.
    Q4.Do you test all your goods before delivery?
    A: Yes, we have 100% test before delivery.



    Add to wishlist

    Add to cart
    Quick view

    -40%Hot




    Compare

    Osseodensification Burs Kit

    , ,
    Original price was: $250.00.Current price is: $150.00.

    Designed with an advanced external irrigation system, these burs are compatible with all implant sizes up to 6.0 mm, offering greater surgical flexibility and efficiency in a single kit. The specially engineered flute design enables dual-function performance for precise osteotomy preparation and bone densification.

    • Mode 1 – Cutting Mode: Operates in clockwise rotation at 800–1500 RPM
    • Mode 2 – Densifying Mode: Operates in counterclockwise rotation at 800–1500 RPM

    Kit Contents:

    • 2 × Parallel Pins
    • 2 × Parallel Pins XL
    • 1 × Ratchet Extender
    • 1 × Parallel Pin



    Add to wishlist

    Add to cart
    Quick view

    -40%Hot




    Compare

    Osseodensification Burs Kit – Versah

    , ,
    Original price was: $250.00.Current price is: $150.00.
    Advanced Osseodensification Burs Kit designed for precise, efficient, and versatile implant procedures. The kit includes externally irrigated tapered burs, tissue punches, pilot drills, sinus lift reamers, parallel pins, and ratchet extender tools compatible with multiple implant systems. Manufactured from premium surgical stainless steel, it supports both Cutting Mode and Densifying Mode at 800–1500 RPM, ensuring controlled osteotomy preparation, bone expansion, and improved implant stability.


    Add to wishlist

    Add to cart
    Quick view

    -95%Hot




    Compare

    Sinus Lift & Universal Densah Osseodensification Burs Kit – Dental Implant

    , ,
    Original price was: $3,350.00.Current price is: $165.00.
    Densah Bur Technology is the Innovation that makes Osseodensification Possible. Instantly Familiar Yet Dramatically Different.
    Total Universal Densah Bur Kit.
    The Universal Densah Bur Kit including Short Densah Burs is the best value for your practice if you use multiple implant systems. These burs are externally irrigated and are compatible with all available sized implants up to 6.0mm diameter, providing you with the flexibility to do more with less. The proprietary flute design allows the bur to work in 2 modes:
    Cutting Mode (Clockwise rotation) at 1000 RPMs
    Densifying Mode (Counterclockwise rotation) at 1000 RPMs.


    Add to wishlist

    Add to cart
    Quick view

    -53%




    Compare

    Sinus Lift Universal Densah Osseodensification Burs Kit

    , ,
    Original price was: $400.00.Current price is: $190.00.
    Densah Bur Technology is the Innovation that makes Osseodensification Possible. Instantly Familiar Yet Dramatically Different.
    Total Universal Densah Bur Kit.
    The Universal Densah Bur Kit including Short Densah Burs is the best value for your practice if you use multiple implant systems. These burs are externally irrigated and are compatible with all available sized implants up to 6.0mm diameter, providing you with the flexibility to do more with less. The proprietary flute design allows the bur to work in 2 modes:
    Cutting Mode (Clockwise rotation) at 1000 RPMs
    Densifying Mode (Counterclockwise rotation) at 1000 RPMs.


    Add to wishlist

    Add to cart
    Quick view

    -45%




    Compare

    Total Universal Densah Osseodensification Bur Kit

    , ,
    Original price was: $400.00.Current price is: $220.00.
    Densah Bur Technology is the Innovation that makes Osseodensification Possible. Instantly Familiar Yet Dramatically Different.
    Total Universal Densah Bur Kit.
    The Universal Densah Bur Kit including Short Densah Burs is the best value for your practice if you use multiple implant systems. These burs are externally irrigated and are compatible with all available sized implants up to 6.0mm diameter, providing you with the flexibility to do more with less. The proprietary flute design allows the bur to work in 2 modes:
    Cutting Mode (Clockwise rotation) at 1000 RPMs
    Densifying Mode (Counterclockwise rotation) at 1000 RPMs.


    Add to wishlist

    Add to cart
    Quick view

    Total Osseodensification Burs Kit




    Compare

    Universal Densah Bur Kit Complete Burs Kit

    , ,
    $185.00
    Densah Bur Technology is the Innovation that makes Osseodensification Possible. Instantly Familiar Yet Dramatically Different.
    Total Universal Densah Bur Kit.
    The Universal Densah Bur Kit including Short Densah Burs is the best value for your practice if you use multiple implant systems. These burs are externally irrigated and are compatible with all available sized implants up to 6.0mm diameter, providing you with the flexibility to do more with less. The proprietary flute design allows the bur to work in 2 modes:
    Cutting Mode (Clockwise rotation) at 1000 RPMs
    Densifying Mode (Counterclockwise rotation) at 1000 RPMs.


    Add to wishlist

    Add to cart
    Quick view

    -35%




    Compare

    Universal Densah Burs Kit

    , ,
    Original price was: $200.00.Current price is: $130.00.
    The Osseodensification Burs Kit is a powerful tool in modern implant dentistry, offering enhanced bone quality and implant stability, particularly in challenging cases with less-than-ideal bone density. The technique offers a minimally invasive approach to preparing the bone, which can lead to better outcomes and faster recovery for patients Osseodensification is a technique that involves compacting and densifying the bone during drilling, rather than removing bone as in traditional drilling methods. This process helps achieve improved primary stability for dental implants and promotes better osseointegration (bone-implant integration) by compacting the bone particles at the site. Bone Densification Minimized Bone Heat


    Add to wishlist

    Add to cart
    Quick view

    -6%




    Compare

    Universal Densah Versah Terphine Drills, Bone Expander, Hex Screws Drivers, Kit of 56 Pcs

    ,
    Original price was: $425.00.Current price is: $400.00.
    Universal Densah Burs Kit of 56 Pcs Complete Professional Kit
    Details:
    Versah Burs Drill Sizes:
    (1525) 2.0 mm,(2535) 3.0 mm, (3545) 4.0 mm, (4555) 5.0 mm.
    (1828) 2.3 mm,(2838) 3.3 mm, (3848) 4.3 mm, (4858) 5.3 mm.
    (2228) 2.5 mm,(3238) 3.5 mm, (4248) 4.5 mm, (5258) 5.5 mm.
    Short Tapered Pilot Drill : 1.6mm
    Burs are externally irrigated
    Drill speeds of 800-1500 Rmp.
    Versah Short Drills Sizes:
    Short Tapered Pilot Drill : (1.8mm)
    DENSAH Bur-G3 VT1525 – Short  (2.0mm)
    DENSAH Bur-G3 VT1828 – Short (2.3mm)
    DENSAH Bur-G3 VT2535  – Short (3.0mm)
    DENSAH Bur-G3 VT2838 – Short (3.3mm)
    DENSAH Bur-G3 VT3545 – Short (4.0mm)
    DENSAH Bur-G3 VT3848 – Short  (4.3mm)
    Membrane Sinus Lift Lateral Reamer Drill Sizes:
    Ø3.3mm Membrane Sinus Lift Lateral Reamer Drill ,
    Ø3.7mm Membrane Sinus Lift Lateral Reamer Drill ,
    Ø3.3mm (Head Size) Membrane Sinus Lift Lateral Reamer Drill
    Ø8.0 Membrane Sinus Lift Lateral Reamer Drill
    Ø6.0Membrane Sinus Lift Lateral Reamer Drill
    Ø8.0mm Lateral Approach Cutter Membrane
    Dental Implant 13 Long & 7 Short Dental implant burs kit With 4 Parallel Pins.
    The Longer Terphine Drills,
    ⌀ 3.0mm
    ⌀ 4.0mm
    ⌀ 5.0mm
    ⌀ 6.0mm
    ⌀ 7.0mm
    Bone Expander:
    1 x Wretched Extender
    5 x Bone Expander Screws
    1 x Ratchet Wrench (4.0mm)
    2 x Parallel Pins
    2 x SAW Disks (7.0mm, 10.0mm)
    1 x Drill Guide
    1 x Hand Driver
    Mini Drivers Hex Screws Drivers 6 Pcs
    6 x Long & Short Hex Screw Drivers
     


    Add to wishlist

    Add to cart
    Quick view





      Compare

      DENSAH Bur- (2.0mm)


      $145.00
      Availability: Usually Ships within I Business
      Day
      Maximum Purchase: 12 units
      Total Length: 37mm
      Apical Diameter: 1.5mm
      Coronal Diameter: 2.5mm
      Average Diameter: 2.0mm
      Connection Type: 20:1 Right Angle Latch
      Handpiece


      Add to wishlist

      Add to cart
      Quick view



      Compare

      DENSAH Bur- (3.0mm)


      $145.00
      Availability: Usually Ships within I Business
      Day
      Total Length: 37mm
      Apical Diameter: 2.5mm
      Coronal Diameter: 3.5mm
      Average Diameter: 3mm
      Connection Type: 20:1 Right Angle Latch
      Handpiece


      Add to wishlist

      Add to cart
      Quick view



      Compare

      DENSAH Bur- G3 (2.3mm)


      $145.00
      Availability: Usually Ships within I Business
      Day
      Total Length: 37mm
      Apical Diameter: 1.8mm
      Coronal Diameter: 2.8mm
      Average Diameter: 2.3mm
      Connection Type: 20:1 Right Angle Latch
      Handpiece


      Add to wishlist

      Add to cart
      Quick view



      Compare

      DENSAH Bur- G3 (4.0mm)


      $145.00
      Availability: Usually Ships within I Business
      Day
      Total Length: 38mm
      Apical Diameter: 3.5mm
      Coronal Diameter: 4.5mm
      Average Diameter: 4.0mm
      Connection Type: 20:1 Right Angle Latch
      Handpiece


      Add to wishlist

      Add to cart
      Quick view



      Compare

      DENSAH Bur- G3 (5.0mm)


      $145.00
      Availability: Usually Ships within I Business
      Day
      Total Length: 38mm
      Apical Diameter: 4.5mm
      Coronal Diameter: 5.5mm
      Average Diameter: 5.0mm
      Connection Type: 20:1 Right Angle Latch
      Handpiece


      Add to wishlist

      Add to cart
      Quick view



      Compare

      DENSAH Parallel Pin


      $5.00
      Availability: Usually Ships within 1 Business
      Day
      Total Length: 22mm
      Side 1 Apical Diameter: 1.5mm
      Side 1 Coronal Diameter: 2.5mm
      Side 2 Apical Diameter: 2.5mm
      Side 2 Coronal Diameter: 3.5mm


      Add to wishlist

      Add to cart
      Quick view



      Compare

      DENSAH Parallel Pin XL


      $5.00
      Availability: Usually Ships within 1 Business
      Day
      Total Length: 22mm
      Side 1 Apical Diameter: 3.5mm
      Side 1 Coronal Diameter: 4.5mm
      Side 2 Apical Diameter: 4.5mm
      Side 2 Coronal Diameter: 5.5mm


      Add to wishlist

      Add to cart
      Quick view



      Compare

      Short DENSAH Bur


      $30.00
      Availability: Usually Ships within I Business
      Day
      Total Length: 33mm
      Apical Diameter: 1.5mm
      Coronal Diameter: 2.5mm
      Average Diameter: 2mm
      Connection Type: 20:1 Right Angle Latch
      Handpiece


      Add to wishlist

      Add to cart
      Quick view



      Compare

      Short DENSAH Bur-G3-S


      $30.00
      Availability: Usually Ships within I Business
      Day
      Total Length: 33mm
      Apical Diameter: 3.5mm
      Coronal Diameter: 4.5mm
      Average Diameter: 4.0mm
      Connection Type: 20:1 Right Angle Latch
      Handpiece


      Add to wishlist

      Add to cart
      Quick view



      Compare

      Short DENSAH Bur-S


      $30.00
      Availability: Usually Ships within I Business
      Day
      Total Length: 33mm
      Apical Diameter: 2.5mm
      Coronal Diameter: 3.5mm
      Average Diameter: 3mm
      Connection Type: 20:1 Right Angle Latch
      Handpiece


      Add to wishlist

      Add to cart
      Quick view



      Compare

      Short DENSAHO Bur-G3-S


      $30.00
      Availability: Usually Ships within I Business
      Day
      Total Length: 33mm
      Apical Diameter: 4.5mm
      Coronal Diameter: 5.5mm
      Average Diameter: 5.0mm
      Connection Type: 20:1 Right Angle Latch
      Handpiece


      Add to wishlist

      Add to cart
      Quick view



      Compare

      Short Tapered DENSAH Pilot Drill-G3-S 1.6mm


      $20.00
      Availability: Usually Ships within I Business
      Day
      Total Length: 33mm
      Apical Diameter: 1.5mm
      Coronal Diameter: 1.7mm
      Average Diameter: 1.6mm
      Connection Type: 20:1 Right Angle Latch
      Handpiece


      Add to wishlist

      Add to cart
      Quick view

        Osseodensification Burs Kit's New Innovations


        The NEW Densah Sinus Lift Kit features Guided Densah Burs and G3 Vertical Stops, engineered to enhance precision and confidence in both routine and advanced sinus procedures.

        Universal Guided Surgery Densah Bur Kit

        The Universal Guided Surgery Densah Bur Kit introduces an innovative approach to optimize clinical care and workflow with confidence.

        • Guided Densah Burs and G3 Vertical Stops allow easy snap-on, snap-off functionality for accurate depth control
        • Streamlined precision designed to integrate with existing guided surgery systems
        • Compatible with universal guided workflows for intelligent treatment planning

        Densah Burs

        Discover the Difference

        Densah Bur Technology is the innovation that makes osseodensification possible.
        Instantly familiar yet dramatically different.

        How It Works
        Why It Works

        Versahtile Clinical Solutions


        Osseodensification Burs Kit's help facilitate Crestal Sinus Lift, Ridge Expansion, Immediate Implant Placement, Guided Expansion Graft, Molar Septum Expansion, Guided Surgery.

        Osseodensification Burs Kit's are compatible with multiple implant systems and aren’t just for special cases – they help facilitate implant placement with various geometries in both the upper and lower jaw.

        Evidence Based Technology through a decade of Biomechanical, Histological, and Clinical Research

        Osseodensification Burs Kit's are worldwide patented, proprietary technology. They are precisely engineered to preserve patients' bone and help clinicians optimize their care with several validated clinical protocols.

        “Thank you for the developrttent Of It has been a rnassive quality shift on what I can accomplish for my patients, who also thank you!
        This technique has allowed me to be able to have consistent results. ” – James
        Shepler, DDS

        Osseodensification Burs Kit's help facilitate Crestal Sinus Lift, Ridge Expansion, Immediate Implant Placement, Guided Expansion Graft, Molar Septum Expansion, Guided Surgery.

        Osseodensification Burs Kit's are compatible with multiple implant systems and aren’t just for special cases – they help facilitate implant placement with various geometries in both the upper and lower jaw.

        Evidence Based Technology through a decade of Biomechanical, Histological, and Clinical Research

        Osseodensification Burs Kit's are worldwide patented, proprietary technology. They are precisely engineered to preserve patients' bone and help clinicians optimize their care with several validated clinical protocols.

        “Thank you for the developrttent Of It has been a rnassive quality shift on what I can accomplish for my patients, who also thank you!
        This technique has allowed me to be able to have consistent results. ” – James
        Shepler, DDS

        Who We Are

        About Us

        We specialize in providing high-quality osseodensification burs kits designed to enhance precision and efficiency in implant dentistry. Our products are engineered to improve bone density, ensure optimal implant stability, and support predictable clinical outcomes. Committed to innovation and reliability, we aim to equip dental professionals with advanced tools that elevate patient care and surgical performance.

        Osseodensification Burs Kit
        0
        Clinicians enjoy the superiority of Densah Burs
        0
        Implantologists Trained Worldwide
        0
        Years of Innovative Clinical Solutions
        0
        Published Scientific Papers

        Universal Densah Bur Kits

        Universal Densah Burs Kit

        $235
        Choose Options
        Total Universal Densah Bur Kit

        • G Stop® Holder
        • Regular and Short Pilot Drills
        • Regular and Short Densah® Burs
        • (3) Parallel Pins
        • (3) XL Parallel Pins
        • Drill Extender

        Universal DENSAH Bur Holder

        $95
        Choose Options
        Universal Densah X Bur Kit

        • X Holder
        • Regular Pilot Drill
        • Regular Densah® Burs
        • (3) Parallel Pins
        • (3) XL Parallel Pins
        • Drill Extender

        Universal Regular Densah Bur Kit

        $170
        Choose Options

        • G Stop® Holder
        • Regular Pilot Drill
        • Regular Densah® Burs
        • (3) Parallel Pins
        • (3) XL Parallel Pins
        • Drill Extender

        Universal Short Densah Bur Kit

        $120
        Choose Options
        Universal Short Densah Bur Kit

        • G Stop® Holder
        • Short Pilot Drill
        • Short Densah® Burs
        • (3) Parallel Pins
        • (3) XL Parallel Pins
        • Drill Extender

        Product Excellence • Clinical Precision

        At Osseodensification Burs Kit, we design and manufacture advanced surgical instruments that enable dental professionals to perform with confidence, accuracy, and consistency in every procedure.

        Innovation • Future-Driven Growth

        Guided by innovation and continuous development, we embrace new technologies and ideas to create solutions that meet the evolving demands of modern implantology.

        Continuous Improvement • Optimized Performance

        Through ongoing refinement and attention to detail, we enhance our products and processes to deliver reliable performance, efficiency, and long-term clinical value.

        Global Reach • Trusted Partnerships

        From local practices to international markets, we are committed to building strong partnerships by delivering high-quality instruments backed by trust, service, and consistent excellence worldwide.

        Our Areas of Competence

        Quality Management • From Start to Finish

        We maintain strict quality management standards at every stage of production, ensuring consistency, reliability, and excellence.

        🏭

        ⚙️ Advanced Cleaning Systems

        Automated cleaning and drying ensure hygiene and durability.

        💻

        📐 Computer-Aided Design

        Precise 3D modeling and technical design support.

        🔧

        🛠 Precision Assembly

        Expert polishing and assembly ensure perfect finishing.

        ✔️

        ✅ Quality Control

        Strict inspection guarantees consistent quality.

        The osseodensification kit has significantly improved implant stability in my practice. Results are consistently predictable.

        Dr. Michael Thompson

        Excellent control during osteotomy preparation. It has reduced complications in soft bone cases.

        Dr. Olivia Bennett

        A game-changer for implant dentistry. Bone preservation is noticeably better compared to conventional drills.

        Dr. Daniel Roberts

        The precision and smooth performance of this system are outstanding in daily clinical use.

        Dr. Sophia Williams

        I’ve seen a clear improvement in primary stability, especially in low-density bone.

        Dr. Ethan Clark

        Highly reliable system with excellent outcomes in sinus lift and ridge expansion cases.

        Dr. Isabella Moore

        After switching to osseodensification, my implant success rate has improved significantly.

        Dr. James Anderson

        Very predictable and safe when used with proper technique and irrigation control.

        Dr. Emma Johnson