Osteotome Insert, Angulated, Size 1 | Helmut Zepf No. 47.991.10
The Osteotome Insert, Angulated, Size 1 is a component of the VGO Ost-Set, angulated (posterior) osteotome kit, developed by Dr. Pavel Krastev DDS as part of the patented VGO Ost-Set system (U.S. Patent No. 9,333,058 B1). It is one of eight graduated angulated osteotome inserts, numbered 1 through 8, used for atraumatic ridge expansion in posterior implant site preparation.
Product Overview
This size 1 insert has a tapered working end of Ø 1 – 3 mm with a convex shank diameter of Ø 3 mm. Unlike the straight kit's threaded tips, angulated inserts are unthreaded since turning motion is limited by the angled approach; a 5 mm mark on every tip indicates the minimum recommended bone threshold for crestal lift.
Key Specifications
- Size: 1 (of 8, angulated kit)
- Tapered Working End: Ø 1 – 3 mm
- Convex Shank Diameter: Ø 3 mm
- Graduation Scale: 5 / 8 / 10 / 13 / 16 mm
- Connection: Hex connection for Z-Shape Universal Handle
- System: VGO Ost-Set, angulated (posterior) kit — No. 47.991.00
- Item Number: 47.991.10
1-Year Warranty
This Helmut Zepf instrument is covered by a 1-year warranty against defects in materials and workmanship from the date of delivery.
60-Day Returns — Any Reason, Even If Used
Put this instrument to work in your practice. If it is not right for you, return it within 60 days of delivery for a full refund — for any reason, even if it has been used.

FAQ
Why are angulated inserts unthreaded? Because the angled approach limits turning motion, so the design forgoes threading in favor of the same passive-engagement taper geometry as the straight kit.
What does the 5 mm mark on the tip indicate? It marks the minimum available bone recommended for a crestal sinus lift, giving the clinician a visual threshold during use.
What are the tapered and shank dimensions of size 1? Size 1 has a tapered working end of Ø 1 – 3 mm and a convex shank diameter of Ø 3 mm.
Manufacturer literature: ZEPF Dental Catalog (PDF) — more in our Surgical Instrument Library.
Specifications: Helmut Zepf No. 47.991.10
| Zepf No. | 47.991.10 |
| Instrument type | VGO osteotome insert, angulated |
| Pattern / designer | VGO Ost-Set (Dr. Pavel Krastev) |
| Working end | Angulated, size 1 |
| Size / gauge | Size 1 |
| Part of set | VGO Ost-Set, angulated (posterior) kit (47.991.00) |
| Pack / sold as | Single instrument |
This is insert size 1 of eight in the angulated (posterior) VGO Ost-Set by Dr. Pavel Krastev, used for step-by-step ridge expansion and crestal sinus lift in the posterior maxilla. Each numbered insert widens the site a step further than the one before it, and the angulated shank gives access in the molar region. It is the first and narrowest size.
Read the guides: Dental Osteotomes Explained · Implantology & Bone Regeneration · Osteotomes & Sinus Lift Instruments · All implantology instruments · All Helmut Zepf instruments
Backed by our Helmut Zepf Warranty — lifetime on extraction and explantation forceps, one year on every other Zepf instrument. Full terms and how to make a claim are on the Warranty page.
