Abstract:Objective To explore the short-term and long-term effects of two kinds of internal maxillary sinus elevation in the treatment of patients with insufficient vertical bone mass in maxillary sinus. [JP2]Methods Fifty-eight patients with insufficient vertical bone mass in maxillary sinus treated from March 2017 to March 2019 were selected and divided into group A (n=30) and group B (n=28) according to the different treatment methods.The operation with hydraulic pressure method was performed in group A,and the operation with osteotome sinus floor elevation technique was conducted in group B.The operative time,visual analogue scale (VAS),lifting height of the maxillary sinus floor,bone resorption height,implant survival rate and adverse reactions were compared between two groups. Results There were no significant differences in the operation time and lighting height of the maxillary sinus floor between two groups (all P>0.05).VAS score in group A was significantly lower than that in group B (P<0.01).At 6-,12- and 24- month after operation,the bone absorption height increased gradually in both groups (P<0.01) and were significantly lower in group A than that in group B (P<0.01).There was no significant difference in implant survival rate between two groups (P>0.05).No maxillary sinus mucosa perforation or hemorrhage occurred during operation and follow-up period in two groups. Conclusions In the treatment of patients with insufficient vertical bone mass in maxillary sinus,both hydraulic pressure method and osteotome sinus floor elevation technique can effectively improve the maxillary sinus floor elevation and the implant retention rate with high safety.The hydraulic pressure method has less bone absorption and pain in the short-term and long-term clinical treatment.