From the inside out—a seamless journey from endodontic therapy to restoration

The HyFlex EDM OGSF sequence is an ideal combination for managing canal curvatures in multiple planes, respecting the natural anatomy and minimising the risk of file fracture. When the sequence is combined with the Jeni in Jeni mode, the clinician no longer needs advanced operating skills, because the system automatically adjusts file movement under stress, safely guiding it to the apex. This makes the procedure highly predictable, even in difficult cases.

The HyFlex EDM (electrical discharge machining) technology of the OGSF nickel–titanium files added another layer of safety and efficiency. Their unparalleled flexibility and exceptional resistance to cyclic fatigue ensure predictable shaping even in complex anatomies. By applying the OGSF standard protocol, clinicians benefit from a streamlined workflow and fast preparation of daily cases. The optimised match of tip and taper along the sequence supports controlled enlargement and maintains canal integrity, making the process both reliable and time efficient. Under high magnification, the 3D canal anatomy was respected throughout instrumentation. The combination of automated feedback and tactile awareness provided an ideal balance between efficiency and control in these complex, curved canals.

Disinfection and obturation

In my clinical routine, I always emphasise that instruments shape, but irrigants clean. Mechanical instrumentation is essential for shaping the root canal, but it alone cannot achieve complete disinfection. For this reason, I rely on a combination of CanalPro sodium hypochlorite and EDTA solutions. These irrigants play a key role in removing biofilm, smear layer and organic tissue, supporting a thorough and effective cleaning process and can be used easily and safely with the accompanying CanalPro SyringeFill station.

After completing thorough chemomechanical disinfection, it was time to prepare the canals for obturation. Drying was achieved with HyFlex EDM paper points (ISO 30/0.04) perfectly matched to the previously used OGSF file sequence. Their high absorbency and precise fit ensured that every trace of moisture was removed, creating ideal conditions for the next step.

For obturation, a modified warm vertical compaction technique was applied at 150 °C using a customised gutta-percha cone. For the final seal and in support of the healing process, ROEKO GuttaFlow bioseal (COLTENE) was chosen. The angulated postoperative radiograph revealed dense filling of all canals and of an additional lateral canal in the distal root, confirming that the modified warm compaction technique and GuttaFlow bioseal had effectively sealed the entire canal system (Figs. 4 & 5).

GuttaFlow bioseal is a bioceramic material that does not just fill space, but interacts with the body. Once in contact with natural fluids, it initiates the formation of hydroxyapatite crystals, essential components of bone and dentine. This chemical reaction strengthens the seal and supports healing, turning a technical step into a biological advantage. Thanks to its tight seal and controlled expansion, it also provides protection against reinfection, ensuring reliable long-term outcomes.

From root canal to restoration

Once the canals had been sealed and the endodontic work completed, the focus shifted to protecting that success. A strong coronal seal is the final safeguard against reinfection and the key to long-term durability. The dentinal surface was carefully etched and bonded for 20 seconds using the light-polymerising ONE COAT 7 UNIVERSAL (COLTENE), creating a secure foundation.

Next, a 1–2 mm layer of BRILLIANT Bulk Fill Flow (COLTENE) was applied as a base, ensuring strength and reducing polymerisation stress (Fig. 6). This layer was light-polymerised according to the manufacturer’s instructions.

For the final aesthetic and functional seal, BRILLIANT EverGlow (Shade A2/B2) was placed and sculpted to achieve smooth contours and a natural appearance (Fig. 7). Thereafter, light polymerisation, finishing and polishing completed the restoration, providing durability, aesthetics and protection against reinfection.

To ensure long-term stability and prevent fractures, it is crucial that all molars have crowns or overlays at the end of endodontic treatment. Therefore, this case was referred back to the referring dentist for the final restoration. The planned approach was to provide cuspal coverage with a BRILLIANT Crios overlay. This innovative reinforced CAD/CAM composite is processed using a digital manufacturing process, enabling reliable, aesthetic and fast restorations without the need for a separate firing process.

Integrated workflow for predictable outcomes

Endodontic phase
The synergy between adaptive motion control and instrument flexibility proved especially beneficial in this case. Throughout preparation, the Jeni motor continuously adapted to canal resistance, while the HyFlex EDM OGSF files followed the natural curvature with remarkable precision. This combination of mechanical intelligence and material design ensured a safe, controlled path to the apex and contributed to the overall predictability of the procedure.

Restorative phase
The system’s material compatibility simplified the workflow and reduced the risk of interfacial defects. Efficient polymerisation, smooth handling and a natural gloss provided both functional stability and aesthetic integration—all within a single session. The one-visit approach minimised patient stress and delivered an immediate functional result. For final restoration, all molars should receive crowns or overlays at the end of endodontic treatment to safeguard the tooth structure and minimise fracture potential.

Conclusion

From canal preparation to the final polish, every step in this treatment was guided by precision and integration. The workflow—from adaptive instrumentation and effective irrigation to a carefully layered restoration—provided safety, efficiency and long-term reliability. This case underscores the value of consistency: each instrument, irrigant and restorative material builds on the last, enabling complex procedures to yield reliable, predictable results.