21st ICOMS 2013 - Abstracts: Oral Papers 1333

T26.OR037

Predictability of chin position after bimaxillary surgery

M. Martins ∗ , J. Claus, C. Marin, L.F. Gil, J.N. Gil

Universidade Federal de Santa Catarina, Brazil

The aim of this job is to evaluate a method to predict the chin alterations throughout the predictivetracings and model surgery in bimaxillary surgeries, without genioplasty procedures. Twenty-sevenpatients who underwent bimaxillary surgery during an 18-month period were included in this study.The antero-posterior chin position was traced from the postoperative cephalogram and predictivetracing onto the original tracing. Comparison between the planned chin position in the cephalometrictracing and actual position was made using the paired t-test when data distribution was symmetric orWilcoxon’s signed-rank test when data distribution was non-symmetric. Association between plannedsurgical movements and post-surgical changes was investigated with Pearson’s correlation. Statisticalsignificance was set at p < 0.05. The mean difference in chin position from predictive tracings tofinal position was −0.72 mm (SD: 1.72 mm) and the mean difference from model surgery to finalposition of the chin was −1.11 mm (SD: 2.08 mm). There was no statistically significant differencebetween the predicted values of chin position change and the real change in the cephalometric tracings(p = 0.536). Neither it was observed a statistically significant difference between the values of chinposition change in model surgery and the real change in the cephalometric tracings (p = 0.621). Thechanges in the final position of the chin presented a strong and statistically significant correlationwith the planned position in model surgery (r2 = 0.85; p < 0.001) and predictive tracings (r2 = 0.91;p < 0.001). The results of this study suggest that is possible to predict the final position of the chinduring bimaxillary surgeries. The changes in the final position of the chin presented a strong andstatistically significant correlation with the planned position in model surgery.

http://dx.doi.org/10.1016/j.ijom.2013.07.563

T26.OR038

Orthognathic surgery: nasogastric tube responsable of the nausea and vomiting?

C. Maza ∗ , A.M. López, A. Kulyapina, B. Leno, M. Tousidonis, A. Garcia, R. Arellano, J.I.Salmerón

Gregorio Maranon Hospital, Spain

Introduction: Orthognathic surgery often requires intermaxillary fixation with wires or elastics.Nausea and vomiting are common (40–50%) despite of antiemetic drugs.

Target: Check if the nasogastric tube is effective in reducing the incidence of nausea and vomitingin orthognathic surgery during first 48 h.

Material and methods: We present a prospective observational study approved by EthicsCommittee. Patients included are ones elected for orthognathic surgery. Exclusion criteria were con-traindications to either drug or controlled hypotension. Patients received antiemetic prophylaxis with4–8 mg dexamethasone and 1.25 mg droperidol. We randomly assigned patients into 2 groups depend-ing on the placement of nasogastrict tube and intermittent aspiration (NG group) or not (NoNG group).After that, we supply 4 mg ondasetron each 8 h at post-operative care unit and at ward.

Results: Five-months sample consists on 29 patients: 12 patients NG group and 17 patientsNoNG group. The groups are homogeneous in preoperative data as well as surgical and anesthetictechnique used. The first 6 h nausea incidence at post-operative care unit is less at NoNG group (25%vs 50%, p = 0.19), the same as vomiting (12.5% vs 25%, p = 0.6). The need to administer ondansetronbolus at post-operative care unit is higher in NG group (83.3% vs 17.6%, p = 0.004).

Conclusions: Nasogastric tube with intermittent aspiration seems to increase nausea and vomi-ting incidence and intensity.

http://dx.doi.org/10.1016/j.ijom.2013.07.564

T26.OR039

Mandibular basal osteotomy: an innovative technique for correction of inferior third facialdeformities

B. Mejia 1,∗ , S. Leon 2, P. Restrepo 2

1 Hospital Universitario De La Samaritana-Universidad Nacional De Colombia, Colombia2 Universidad Nacional de Colombia, Colombia

The mandibular basal or osteotomy or Chin Wing osteotomy, is an innovative technique initiallydescribed by Albino Triaca in 2009, and later popularized by Cesar Guerrero, for the management ofpatients with facial abnormalities that require correction of mandibular basal flange at different levels.It can be used singly or simultaneously with other techniques. This osteotomy has precises indicationsand requires an experienced surgeon. Its versatility allows changes at mandibular transverse, sagittaldimensions. Reducing the risk of injury to the inferior alveolar nerve, and less noticeable step bonethat created with a traditional mentoplasty. Its main advantage is to produce great changes withoutaltering or modifying facial occlusion, allowing use in dentally compensated cases of patients or inwhich movements are contraindicated orthodontic decompensation. We report the application of thetechnique and follow up in 8 patients at the University Hospital of the Samaritan, Bogota, Colombia.

http://dx.doi.org/10.1016/j.ijom.2013.07.565

T26.OR040

Have the indications for tads increased?

B. Melsen

University of Aarhus, Department of Orthodontics, Denmark

The TADs were introduced into the orthodontic world to make it possible to treat patientslacking sufficient teeth for conventional anchorage. Later the TADs were used to avoid the effect ofundesirable forces action on the reactive units, but it was especially the option of offering compliancefree treatments that made the skeletal anchorage popular. Lately it has been demonstrated that TADsmay have several other applications that just serving as an aid facilitating orthodontics. Transcorticalinsertion of TADs can be used as bone maintainers if the time for the insertion of e dental implanthas to be postponed for various reasons, age or economy. The TADS may thus serve as an adjunctto prosthodontics. Finally the TADs can serve as handles when bony units have to be displaced inrelation to distraction osteotomy of alveolar bone or when a rapid palatal expansion without loadingof teeth is indicated. The lecture will demonstrate the different applications.

http://dx.doi.org/10.1016/j.ijom.2013.07.566