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简介：AbstractObjectives:To demonstrate three-hundred and sixty degrees of maxillary sinus (MS) surgical approaches using cadaveric dissections, highlighting the step-by-step anatomy of each procedure.Methods:Two latex-injected cadaveric specimens were utilized to perform surgical dissections to demonstrate different approaches to the MS. The procedures were documented with macroscopic images and endoscopic pictures.Results:Dissections were performed to approach the MS medially (endoscopic maxillary antrostomy and ethmoidectomy), anteriorly (Caldwell-Luc), superiorly (transconjunctival/transorbital approach), inferiorly (transpalatal approach), and posterolaterally (preauricular hemicoronal approach).Conclusion:A number of approaches have been described to address pathology in the MS. Surgeons should be familiar with indications, limitations, and surgical anatomy from different perspectives to approach the MS. This paper illustrates anatomic approaches to the MS with detailed step-by-step cadaveric dissections and case examples.

简介：Gingivaladenoidcysticcarcinoma(ACC)isararemalignancy.Wedescribethediagnosisandtreatmentofa43year-oldwomanwhopresentedwithapersistentoralulcerforapproximately1year,andsubsequentpainintheleftposteriormaxillaryregion.Clinicalexaminationrevealedanulcerintheleftuppermolargingiva,withswellingintheregionfromthesecondpremolartothethirdmolar.X-rayimagesdemonstratedtheinvolvementofthemaxillaryalveolarbone.ThehistopathologicalandimmunohistochemicalfeatureswerediagnosticofACC.ACCisoftenpresentedasagingivallesion;thus,itmayeasilybeneglectedbypatients.Theidentificationofthistumorusingspecificpathologicalanalysespreventsmisdiagnosisandenablesclinicianstodeterminetheappropriatetreatment.Inthiscase,norecurrenceordistantmetastasiswasobservedafter2yearsoffollow-up.

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简介：AbstractObjective:For the treatment of obstructive sleep apnea in adults, mandibular advancement devices (MADs) are often used. Since adults with a prognathic mandibular phenotype are at risk of developing an unfavorable facial profile, midfacial development using biomimetic oral appliance therapy might provide a suitable alternative. However, the effect of this procedure on the maxillary air sinuses is unknown; therefore, changes in sinus pneumatization were investigated in this study.Methods:After obtaining informed consent, 16 consecutive Korean adults with midfacial hypoplasia had 3D cone-beam (CB) CT scans taken, and biomimetic upper appliances (DNA appliance®, Vivos Therapeutics, Inc., USA) were constructed. All subjects were instructed to wear the device 12-16 h/day. Each month, examination for the progress of midfacial development was recorded. Post-treatment, a follow-up 3D CBCT scan was undertaken with no device in the patient’s mouth. Pre- and post-treatment linear and volumetric measurements were obtained using appropriate software, and compared statistically using t-tests.Results:The mean age of the sample was 25.0 yrs ± 8.7. The mean treatment time was 15.5 mths ± 5.2. Post-treatment, the transpalatal bone width increased from 35.3 mm ± 3.0 to 38.5 mm ± 2.0 (P < 0.001); the maxillary air sinus volume on the left side increased from 18.8 cm3 ± 6.5 to 20.0 cm3 ± 6.0 (P < 0.05), and from 18.5 cm3 ± 5.7 to 19.7 cm3 ± 5.8 (P < 0.05) on the right side.Conclusions:Biomimetic oral appliance therapy may be able to increase the maxillary air sinus volume in adults. In view of these preliminary findings, further studies on the effect of enhanced pneumatization on paranasal sinus function and sleep parameters are warranted.

简介：Diastemaoftenoccuredinmaxillarycompletedentureresinbaseintheclinic,although"Lucitone199"hadbeenusedwithmoretensilestrength.Mechanicalex-perimentshaveprovedthehightransversetensilestress(σ_x~+)concentratinginanteri-orteethregionandtheirpalatalsurfaceofmaxillarycompletedentureresinbasewhileitwasexposedtoverticalloadingincenterocclusion.Settingstrengtheningnetinresinbasehasachievedbetterresults.Forevaluatingpurpose,twentykinds