Introduction: Panoramic radiographs are frequently used as a radiographic method in the evaluation and preparation of treatment protocols before dental implant procedures. The study aimed to examine the congruence between the planned and placed implant sizes on preoperative panoramic radiographic images in dental implant patients and to evaluate the reliability and adequacy of panoramic radiography in this context. Materials and Methods: In this study, the records of 568 patients who applied to our clinic for dental implant treatment between March 2023 and February 2024 were examined. Patients who received implants in the maxillary and mandibular posterior regions and had preoperative panoramic radiographs were included in the study. Statistical analyses were performed using SPSS 23 (SPSS Inc., Chicago, IL, USA) software. Results: A total of 443 dental implants were included in the study, involving 234 patients. Of the implants, 46.7% (n=207) were placed in the maxillary posterior region, and 53.3% (n=236) were placed in the mandibular posterior region. The intraclass correlation coefficient (ICC) for the concordance between planned and placed implant lengths was found to be 0.9014. This ICC was measured at 0.9036 among male patients and 0.9 among female patients. These results indicate a high level of concordance between the planned and actual implant lengths. Conclusion: Panoramic radiography can be considered a simple, accessible, and useful tool in determining implant length before dental implant treatment. However, advanced radiographic examinations such as cone-beam computed tomography may also be necessary for more consistent implant treatment planning.