Surgical procedure After removing the polyp, a conventional BAY 73-4506 access cavity was prepared in the occlusal surface of the first molar with a 330-carbide bur and widened with an Endo-Z bur (Dentsply Maillefer, Tulsa, OK, USA) to enhance visibility of the root canal system. Irrigation of the canal was done several times with 5% sodium hypochlorite, and the last irrigation solution was left in the canal to dissolve organic material. Determination of the working length was done using an electronic apex locator (Root ZX?, J Morita Corporation, Kyoto, Japan) and the radiograph. Canal enlargement was performed using a hand file, and the root canals were filled with gutta-percha points (Diadent, Seoul, Korea) and sealer (AH26, Dentsply, Konstanz, Germany) using a lateral condensation technique (Figure 3).

A post (ParaPost, Colt��ne/Whaledent Inc., Cuyahoga Falls, OH, USA) was inserted in the mesio-buccal canal (Figure 4), and the core build-up was done with a light-cured resin (Fuji II LC, GC, Alsip, IL, USA) added in layers (Figure 5). Figure 3. Radiograph of the lower right first molar filled with gutta-percha points and sealer using a lateral condensation technique. Figure 4. Radiograph with the post in place. Figure 5. Buccal view with a resin core. Following an injection of 2% lidocaine with 1:100,000 epinephrine local anesthetic, a full-thickness flap was reflected. Crown preparation was done and ostectomy was performed to create an appropriate biologic width (Figure 6). Sutures were placed, and routine postoperative instructions were given (Figure 7).

The patient was prescribed amoxicillin 500 mg 3 times per day for 5 days, mefenamic acid 500 mg initially, then mefenamic acid 250 mg 4 times per day for 5 days, and 0.12% chlorhexidine digluconate 3 times per day for 2 weeks. Figure 6. Crown preparation and crown lengthening procedure were done after a full-thickness flap was reflected. Figure 7. Occlusal view of sutured surgical site showing the prepared tooth. Clinical observations Two weeks after surgery, any remaining sutures were removed. The surgical site showed good healing (Figure 8). A temporary prosthesis was fabricated and cemented (Temp-Bond, Kerr Corp., Romulus MI, USA). A two-month postoperative occlusal view showed good soft tissue healing (Figure 9). Figure 8. A fourteen-day postoperative buccal view showing good healing state. Figure 9.

A two-month postoperative occlusal view showing good healing. The final evaluation at three months shows a healthy state of soft tissue with good adaptation of the final restoration (Figure 10). Figure 10. Buccal view with the permanent restoration at the final evaluation. DISCUSSION Crown lengthening is performed to achieve adequate room for crown preparation and reestablishment of the biologic width.2 Traditional Drug_discovery staged approach forces the periodontist to estimate the approximate location of the crown margin.