Objective To explore the application of simple transcrestal sinus ffoor elevation in severe bone height deffciency in the posterior tooth region. Methods A total of 60 patients with severe bone height deffciency in the posterior tooth region admitted to Beijing Daxing District Hospital of Integrated Chinese and Western Medicine from January 2025 to November 2025 were selected, and they were divided into the reference group and the study group by the random number table method, with 30 patients in each group. The reference group was treated with lateral window sinus ffoor elevation, and the study group was treated with simple transcrestal sinus ffoor elevation. The implant success rate, implant stability coefffcient, osteogenesis effect indicators, treatment satisfaction and complication rate were compared between the two groups. Results The implant success rate of the study group was 96.67%, which was higher than 73.33% of the reference group (P<0.05). There was no statistically signiffcant difference in the immediate postoperative implant stability coefffcient between the two groups (P>0.05). The implant stability coefffcient of the study group at 3 months after operation was higher than that of the reference group (P<0.05). The osteogenesis effect indicators of the study group were better than those of the reference group (P<0.05). The treatment satisfaction rate of the study group (96.67%) was higher than that of the reference group (73.33%) (P<0.05). The incidence of complications in the study group (3.33%) was lower than that in the reference group (26.67%) (P<0.05). Conclusion Compared with lateral window sinus ffoor elevation, simple transcrestal sinus floor elevation in the treatment of severe bone height deficiency in the posterior tooth region can effectively improve the implant effect, enhance osteogenesis indicators and implant stability coefffcient, with good safety, and can achieve high patient treatment satisfaction.