PMC8245232_01
Preoperative images: radiograph images of tooth 36 (a) and 37 (b) prior to endodontic treatment and postendodontic treatment (c) and clinical view of tooth 37 (d) and 36 (e).
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fig1
After copious irrigation with NaOCl solution (Chloraxid 2%, Cerkamed, Stalowa Wola, Poland), the final irrigation with EDTA solution (MD-Cleanser, Meta Biomed Europe GmbH, Mulheim an der Ruhr, Germany) and ethanol 95% (Chemax Pharma, Sofia, Bulgaria) was done before filling the canals with AH plus root canal sealer (Dentsply DeTrey, GmbH, Konstanz, Germany) and taper-matched gutta-percha cone (Sure Dent, Sagimakgol-ro, Jungwon-gu, Seongnam-si, Gyeonggi-do, South Korea) utilizing a single-cone technique (Figure 1).
The custom-made air machine used in this study. Autoclavable handpiece made from polyacetate material (placed on the side wall of the device) (a, b). Front panel of the device and basic components (c).
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fig2
The key step in the protocol was the silane heat treatment performed with a custom-made hot air machine (Figure 2).
Bonding procedure: silane application (a); postsilanization heat treatment with custom-made device (b); bonding agent application (c); bonding agent solvent evaporation (d).
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fig3
The steps are presented in Figure 3.
Postoperative view of the two overlays immediately after fixation and isolation removal.
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The final result is shown in Figure 4.
Four-year follow-up of the restorations: occlusal view (a); buccal view (b); lingual view (c); a close-up image of the overlay-tooth interface (d), white arrows pointing to the borders of the restorations; radiograph examination (e, f).
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fig5
We observed no hypersensitivity, no secondary or primary caries, very good periodontal response, healthy mucosa, and no general oral symptoms (Figure 5).