Stainless steel cross-head impression screw, Ø 1mm, L 4mm, with identification cap - Helmut Zepf (47.573.04S) - Delynov

What is the Helmut Zepf cross-drive screw?

The cross-drive screw developed by Helmut Zepf is a micro-osteosynthesis device designed for oral and implant surgery. Manufactured from high-quality stainless steel, it features a 1mm diameter and a 4mm length. Its structure is optimized by a cross-drive recess allowing for efficient force transmission during screwing, thereby limiting the risks of insert slippage. This specific model integrates a colored or marked identification cap, facilitating rapid recognition of its dimensions within the surgical tray. It is primarily used for the mechanical stabilization of bone fragments or filling materials during pre-implant reconstruction phases.

What are the clinical indications for this 1mm osteosynthesis screw?

The use of this 1mm osteosynthesis screw is indicated in reconstructive surgery protocols of the jaws. It is particularly requested during the shell technique or onlay grafting to firmly fix a cortical bone block harvested from the patient. In implantology, its short 4mm length makes it suitable for areas where available depth is limited, allowing for the maintenance of a non-resorbable membrane or a protective shield without interfering with underlying anatomical structures. Its role is crucial to ensure the immobility of the graft, a sine qua non condition for optimal revascularization and future osseointegration of the implants.

What are the technical characteristics of reference 47.573.04S?

Reference 47.573.04S corresponds to a precision technical screw featuring a 1mm body diameter for a total length under the head of 4mm. Its stainless steel design guarantees high mechanical resistance to torsional stress during insertion into dense cortical bone. The cross-drive recess of the screw head ensures compatibility with standard Helmut Zepf system screwdrivers, offering a stable grip. The included identification cap allows for rigorous operating room organization. These technical specifications meet the requirements of guided bone regeneration (GBR) surgery requiring miniaturized but robust components for the manipulation of small bone volumes.

What are the contraindications for the use of this surgical steel screw?

The use of this surgical steel screw is contraindicated in patients with a known hypersensitivity or allergy to the metals composing stainless steel, such as nickel or chromium. Clinically, it must not be used if the bone quality of the recipient site is insufficient to guarantee primary stability of the screw, or in case of active infection at the surgical site. It is also discouraged to use this device in situations where mechanical stresses exceed the structural strength of a 1mm diameter screw. The practitioner must evaluate the benefit/risk ratio in the presence of systemic bone healing disorders or uncontrolled metabolic pathologies.

What are the precautions related to the non-resorbable nature of steel?

Being composed of stainless steel, this Helmut Zepf screw is a non-resorbable device. It remains stable in the body and does not undergo degradation by hydrolysis or enzymatic action. In the majority of bone regeneration cases, a second intervention is necessary to remove the screw once graft consolidation is achieved, generally before or during implant placement. The practitioner must ensure that the screw head does not create an area of irritation for the overlying soft tissues, which could lead to premature exposure. Total and tension-free mucosal coverage is imperative to prevent any septic complication around the osteosynthesis material.

Who is the manufacturer and what are the recommendations for use?

The official manufacturer of this device is Helmut Zepf Medizintechnik GmbH, a company recognized for its expertise in instrumentation and fixation systems for dental surgery. Although specific data on the regulatory class or CE marking are not detailed here, Helmut Zepf products are designed according to rigorous manufacturing standards specific to invasive medical devices. It is imperative for the user to systematically refer to the instructions for use provided by the manufacturer to check sterilization protocols, storage conditions, and cleaning instructions. The handling of these screws must be performed exclusively by healthcare professionals trained in oral surgery and implantology techniques.

State of the art

Guided bone regeneration (GBR) in implantology relies on membrane fixation quality.