Clinical evaluation of antral septal maxillary sinus floor elevation by the disk-up sinus reamer / 中华口腔医学杂志

Objective: To investigate the clinical effect of disk-up sinus reamer (DSR) in maxillary sinus floor elevation with maxillary sinus septum. Methods: Twenty-four patients were included between January 2019 to January 2020 in Department of Oral Implantology, The Affiliated Hospital of Qingdao University. There were 10 males and 14 females with the age of (39.3±11.7) years old (range 22-56 years). Pre-operative(T0) cone-beam CT (CBCT) was taken for measurement and analysis. All patients were divided into group E (easy situations, septum located anterior to the zygo-matic process), group M (moderate situations, septum located pos-terior to the zygo-matic process) and group D (difficult situations, sagittally oriented septum). The maxillary sinus floor was grafted through the crestal approach by DSR and implants were placed simultaneously. Permanent repair was performed 6-8 months after operation. All patients underwent CBCT before surgery, after surgery immediately (T1), 6 months after surgery(T2), 1 year after surgery(T3), 2 year after surgery(T4). The residual bone height (RBH) and the vertical bone height (VBH) were analyzed. The mucosal perforation rate, implant survival rate were counted. Results: All the 24 patients completed the Maxillary sinus lift surgery successfully and 24 implants were placed simultaneously. All patients had no headache, dizziness. The mucosal perforation rate was 0. The survival rate of implants during the healing period was 100%(24/24). The RBH was (5.81±2.56) mm pre-operation, the VBHT1, VBHT2, VBHT3 and VBHT4 were (11.82±1.09), (10.98±0.52), (10.66±0.44) and (10.40±0.33) mm, respectively. The differences between the groups by pairing test were statistically significant (F=187.70, P0.001), expect VBHT3 and VBHT4 (P=0.071). Bone resorption and remodeling mainly occurred 1 year after surgery. One patient developed peri-implantitis 18 months after surgery. Conclusions: With the RBH of implant site>2 mm and existence of maxillary sinus septum, using DSR for sinus floor elevation has a high success rate. It can obtain enough bone height and complete the simultaneous implantation to form a good osseointegration. The DSR is simple, safe and controllable, and can shorten the operation time.

Clinical study of transcrestal maxillary sinus floor elevation with the disk-up sinus reamer / 中华口腔医学杂志

<p><b>OBJECTIVE</b>To evaluate the clinical effect of the disk-up sinus reamer (DSR) applied to transcrestal maxillary sinus floor elevation with simultaneous placement of implants.</p><p><b>METHODS</b>Thirty-seven patients underwent transcrestal maxillary sinus floor elevation with fifty-one implants placed simultaneously using the DSR. The residual bone height (RBH) was 3 to 8 mm, (5.61 ± 1.61) mm on average. The safety of this technique and the pain index during the operation was evaluated. The final prostheses were restored in 3-6 months postoperatively. The follow-up period was 3 to 24 months. The stability and osseointegration of the implants were clinically evaluated, and the endo-sinus bone gain around the implants were measured.</p><p><b>RESULTS</b>The elevation height ranged from 2 to 8 mm, with an average of (4.75 ± 1.55) mm. There was no detectable sinus membrane perforation, no serious suffering or uncomfortable subjective sensation in any patients during operation with a pain index of (2.22 ± 0.98). During the follow-up period, no sinus complication was observed. Favorable osseointegration was obtained. There were no implants or prostheses which were loose or lost. The survival rate was 100%. The radiographic results demonstrated that the endo-sinus bone gain tended to reach stabilization after 6 months and the marginal bone loss was (1.20 ± 0.72) mm after 12 months.</p><p><b>CONCLUSIONS</b>Transcrestal maxillary sinus floor elevation with simultaneous implant placement by DSR is a safe, invasive and handy technique, with higher elevation height, fewer clinical complications and less pain. It shows satisfactory clinical results in short term and a long-term observation is still needed.</p>

Applied anatomy of adult mandibular ramus / 中华口腔医学杂志

<p><b>OBJECTIVE</b>To study applied anatomy of adult mandibular ramus and condyle.</p><p><b>METHODS</b>Observation and measurement were made on 16 adult mandibular rami and condyles.</p><p><b>RESULTS</b>Thickness became gradually greater within 15 mm from the back edge of ramus. Some adult mandibular rami had no spongy bone at the level of 10 mm above mandibular foramen.</p><p><b>CONCLUSIONS</b>These date are very important for application of lag screw osteosynthesis in condylar fracture.</p>

Maxillary sinus lifting and simultaneously placement of implants from the top of alveoli / 中华口腔医学杂志

<p><b>OBJECTIVE</b>To study the effect of maxillary sinus floor elevation by the Frialit-2 Bone Condenser for implantation.</p><p><b>METHODS</b>11 patients underwent sinus floor lift by The Frialit-2 Bone Condenser and were inserted 14 implants. The time of following up was 10 - 21 months.</p><p><b>RESULTS</b>There were no implant loose or lost, no clinical complaint of maxillary sinus area, and X-ray exam showed well osseointegration.</p><p><b>CONCLUSIONS</b>The Frialit-2 bone condenser can be used for lifting sinus floor, and the sinus elevation without lateral access allows the insertion of implants with no additional surgical stress for the patients.</p>