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作者： Manju Bajracharya 重庆医科大学

学位级别：硕士

Objectives: To determine and analyze the incisal jaw morphology of maxillary bone of class II division 1 malocclusion among different vertical skeletal facial types.Materials and methods: 121 subjects of pretreatment lateral cephalometric radiographs with class II division 1 malocclusion including 54 males and 67 females of early permanent dentition aged from 12-14 years were studied. SN-MP angle was used to select 59 average angle, 30 high angle and 32 low angle vertical skeletal facial types Chinese patients. To observe the incisal jaw morphology of maxilla and mandible much index were traced from lateral cephalograms were analyzed and measured using factorial analysis. 53 parameters including linear, area ratio and angular measurements were processed using t-test and ANOVA. The characteristics of abnormal jaw morphology at incisor area of upper and lower incisors among three vertical facial skeletal types were discussed in detail.Results: At the upper and lower central incisors low angle individuals presented a greater dentoalveolar and basal bone thickness than high and average angle individuals. The distance from the root apex of upper and lower central incisors were far away from the lingual cortex in low angle than high angle individuals. The region between point PA, PC and TB, TC may be regarded as the limitations of palatal and lingual movement of maxillary and mandibular incisors. The compensation inclined changes on the palatal cortical plates relating to SN and PP plane and lingual cortical plates relating to GoGn plane brings compensation changes in the morphological structure of maxillary and mandibular jaws at incisor area in anterioposterior dimension. The areas of maxillary and mandibular basal bones showed consistent because of the inverted compensation changes in the height and thickness of the incisor jaw bones. The ability of compensation changes may be stronger in maxillary jaw at incisor area than mandibular jaw at the incisor area.

关键词： class II division 1 malocclusion maxillary bone incisor jaw morphology cephalometrics

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Cone-Beam Computed Tomography Evaluation of the Positions of Unerupted Maxillary Canines with incisor Root Resorption

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Open Journal of Stomatology 2017年第3期7卷 169-179页

作者： Sachio Tamaoki Hiroyuki Ishikawa Kyoko Oka Masao Ozaki Akiko Abe Shunsuke Takata Shozaburo Hata Section of Orthodontics Department of Oral Growth & Development Division of Clinical Dentistry Fukuoka Dental College Fu-kuoka Japan Fukuoka Dental College Fukuoka Japan Section of Pediatric Dentistry Department of Oral Growth & Development Division of Clinical Dentistry Fukuoka Dental College Fukuoka Japan

Purpose: To establish a new coordinate system using the incisive canal and incisive foramen in cases confirmed to have root resorption in the maxillary incisor region by cone beam computed tomography (CBCT) to investigate the positions of the central and lateral incisor roots and erupting maxillary canine tooth crowns in the horizontal plane. Methods: Nine patients (two males;mean age: 10.5 years old) with suspected incisor root resorption due to erupting maxillary canines on panoramic X-ray images and in whom incisor root resorption was confirmed on CBCT images were evaluated. A control group of 12 patients with a supernumerary tooth on one side (three males;mean age: 8.6 years old) was also examined. X, Y, and Z-axes were defined, and the positions of the centers of the central incisor root (U1) and lateral incisor root (U2) and the canine cusp (U3) were examined, along with alveolar process width and length. Results: In the control group, U1, U2, and U3 were located within a certain range without overlap, while, in the incisor root resorption group, U3 overlapped with U1 and U2 and tended to deviate centrally. U2 tended to be located further posteriorly than U3. The anteroposterior diameter of the alveolar process was 1.2 mm shorter in the incisor root resorption group (p incisor root resorption accompanying canine eruption can be evaluated early by investigating the canine position on a horizontal plane established on the upper anterior tooth dentition CT images with a coordinate system using the incisive canal and incisive foramen.

关键词： CBCT incisor Root Resorption Maxillary Canine Incisive Canal Alveolar Process

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Treatment of Skeletal CL II Patient with Maximum Lower incisor Protrusion and Minimum Overjet with Rahhal Functional Appliance

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Open Journal of Stomatology 2018年第12期8卷 319-325页

作者： Ahmad Abdallah Rahhal Department of orthodontics Faculty of Dentistry Arab American University Jenin Palestine

Treatment of skeletal Cl II includes functional orthopedic treatment, head-gears, extraction of the upper premolars and orthognathic surgery. To treat any patient with functional appliances (bite jumping) an adequate overjet is necessary. In this case an 11 years old female patient has skeletal CLII due to mandibular deficiency with ANB angle 8 degrees, overbite: 3 mm, overjet: 1 mm, extremely convex profile and underdeveloped chin due to the hyper muscle contraction of the lower lip to obtain oral seal. To obtain an adequate overjet lower first premolars were extracted and maximum retraction using mini screws (for maximum anchorage) was applied. Afterwards Rahhal functional appliance was used by the patient 16 hours a day for 6 months and 10 hours a day for another 6 months for retention. After that fixed orthodontic treatment was completed. Lateral cephalometrics were taken, traced and analyzed. In the result Skeletal CLI was obtained (ANB 4 degree), straight facial profile, normal over bite overjet and particular chin development were noticed. As a conclusion, in skeletal CLII malocclusions, lower incisor protrusion will cause a contraindication for functional treatment. Extraction of the lower premolars and retraction of the lower incisors followed by functional orthopedic treatment is an efficient method to treat these cases instead of waiting for orthognathic surgery, also reducing the muscle pressure on the chin will change the development characteristics of it.

关键词： Rahhal Functional Appliance Lower incisor Protrusion Minimum Overjet Maximum Anchorage Chin Development

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Molar incisor hypomineralization and pre-eruptive intracoronal lesions in dentistry-diagnosis and treatment planning

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World Journal of Stomatology 2019年第2期7卷 20-27页

作者： Uri Zilberman Jomanna Hassan Shirley Leiboviz-Haviv Pediatric Dental Clinic Barzilai Medical University Center

The aim of this study is to report the diagnostic features, prevalence, mineral content, clinical significance and treatment options of molar incisor hypomineralization(MIH) and pre-eruptive intracoronal lesions(PEIR), in order to minimize miss-treatment of primary and permanent teeth in young *** was defined as the occurrence of hypomineralization of one up to four permanent first molars from a systemic origin and frequently associated with affected incisors. PEIR are lesions that are located in the occlusal portion of the crown of unerupted permanent or primary teeth. The prevalence of MIH was reported between 2.5%-40% in the permanent first molars and 0%-21.8% in primary second molars. PEIR was observed in 2%-8% of children, mainly in mandibular second premolars and second and third permanent molars. A number of possible causes for MIH were mentioned, including environmental changes, diet and genetics in prenatal and postnatal periods, but all are questionable. In PEIR, the resorption of the intracoronal dentine begins only after crown development is complete and is caused by giant cells resembling osteoclast observed histologically on the dentine surface close to the pulp. The mineral content in MIH is reduced in comparison to normal enamel and dependent on the severity of the lesion. In PEIR the resorbed surface of enamel showed less mineral content. The hypomineralized enamel in MIH is not suitable for restorations with amalgam or composite materials, and the best material should be based on remineralization material like glass-ionomers. Similar, the resorbed dentin surface in PEIR should be covered by the biocompatible and remineralizing glass-ionomer cement.

关键词： Molar incisor hypomineralization Pre-eruptive intracoronal lesions Glassionomer cements Enamel Dentin

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Alveolar Ridge Preservation of an Extraction Socket of Fractured Maxillary Lateral incisor

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Case Reports in Clinical Medicine 2016年第1期5卷 19-24页

作者： Hasan Ayberk Altug Abdullah Tugrul Coskun Aydın Ozkan Tamer Zerener Metin Sencimen Department of Oral and Maxillofacial Surgery Gulhane Military Medical Academy Ankara Turkey

Background: Alveolar ridge resorption still continues to be a problem in oral surgery. Cause of bone resorption is including tooth extraction, periodontal disease and inflammatory periapical pathologies. Various methods and materials have been suggested to minimize this resorption. Aim: Goal of this case report is to present alveolar ridge preservation (ARP) following horizontally fractured maxillary lateral incisor with allograft in the aesthetic zone. Case presentation: 30-year-old female patient with fractured tooth was treated by grafting and insertion dental implant. Fractured tooth extraction was performed and extraction socket augmentation was performed by allograft and covered with collagen membrane. Augmented area was treated with bone-level implant. Definitive prosthesis single-tooth porcelain-fused-to-zirconia restorations were fabricated. Conclusions: Before implant insertion, extraction and grafting socket procedure is appropriate treatment for of fractured teeth with granulation tissue.

关键词： Dental Trauma Maxilla incisor Allograft Dental Implant

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A study of the rotation rate of single-rooted teeth in dogs

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Journal of Medical Colleges of PLA(China) 1992年第1期7卷 70-72页

作者：段银钟陈华张巧余 Department of Orthodontics Stomatological CollegeFourth Military Medical UniversityXi'an 710032

Sixteen one-year-old dogs were used in our *** rotated the maxillary secondincisors of the dogs,applying a force of 100g and a moment of 550g·*** duration of theexperiment varied from 72h to 8 *** was performed once every 2 weeks and the impressions were taken in order to measure the angles of *** results of our experiment showthat the rotation rate of single-rooted tooth in dogs is 3.04/*** graph shows the form ofgradual *** paper introduces a new specialized experimental apparatus for tooth *** angles of rotation are measured geometrically.

关键词： tooth rotation tooth root incisor animal experiment dogs

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