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1.
Fa Yi Xue Za Zhi ; 40(2): 149-153, 2024 Apr 25.
Artigo em Inglês, Zh | MEDLINE | ID: mdl-38847029

RESUMO

OBJECTIVES: To investigate the age-related changes of the mandibular third molar root pulp visibility in individuals in East China, and to explore the feasibility of applying this method to determine whether an individual is 18 years or older. METHODS: A total of 1 280 oral panoramic images were collected from the 15-30 years old East China population, and the mandibular third molar root pulp visibility in all oral panoramic images was evaluated using OLZE 0-3 four-stage method, and the age distribution of the samples at each stage was analyzed using descriptive statistics. RESULTS: Stages 0, 1, 2 and 3 first appeared in 16.88, 19.18, 21.91 and 25.44 years for males and in 17.47, 20.91, 22.01 and 26.01 years for females. In all samples, individuals at stages 1 to 3 were over 18 years old. CONCLUSIONS: It is feasible to determine whether an individual in East China is 18 years or older based on the mandibular third molar root pulp visibility on oral panoramic images.


Assuntos
Determinação da Idade pelos Dentes , Polpa Dentária , Dente Serotino , Radiografia Panorâmica , Raiz Dentária , Humanos , Dente Serotino/diagnóstico por imagem , Masculino , Adolescente , Feminino , Adulto , Adulto Jovem , China , Raiz Dentária/diagnóstico por imagem , Determinação da Idade pelos Dentes/métodos , Polpa Dentária/diagnóstico por imagem , Mandíbula/diagnóstico por imagem , Odontologia Legal/métodos , Fatores Etários
2.
Forensic Sci Int ; 350: 111801, 2023 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-37536075

RESUMO

Recently, 3D dental intraoral scanning technology has been developed rapidly and applied widely in everyday dental practice. Since 3D dental scanning could provide valuable personal information, it enabled researchers to develop novel procedures for individual identification through 3D-3D dentition superimposition. This study aimed to test the applicability of this method in an Eastern Chinese population and propose a threshold for personal identification. For this purpose, 40 volunteers were recruited, and the initial 80 (upper and lower) 3D intraoral scans (IOS) were collected. After one year, 80 IOS of these volunteers were repeatedly collected. In addition, the other 120 IOS of 60 patients were extracted from the database. The 3D models were trimmed, aligned, and superimposed via Geomagic Control X software, and then the root mean square (RMS) value of point-to-point distance between the two models was calculated. The superimposition of two IOS belonging to the same individual was considered as a match, and superimposition of two IOS belonging to different individuals was considered as a mismatch. Totally, superimpositions of 80 matches and 3120 mismatches were obtained. Intra- and inter-observer errors were assessed through the calculation of relative technical error of measurement (rTEM). Mann-Whitney U test verified possible statistically significant differences between matches and mismatches (P < 0.05). The rTEM of intra- and inter-observer repeatability analyses was lower than 4.7 %. The range of RMS value was 0.05-0.18 mm in matches and 0.72-2.28 mm in mismatches without overlapping. The percentage of accurate identification reached 100 % in blind test through an arbitrary RMS threshold of 0.45 mm. The results indicated that individual identification through the 3D-3D dentition superimposition was effective in Eastern Chinese population. Successful identification could be achieved with high probability when the RMS value of the point-to-point distance of two dentitions is <0.45 mm.


Assuntos
Dentição , Imageamento Tridimensional , Humanos , Imageamento Tridimensional/métodos , População do Leste Asiático , Software , Povo Asiático
3.
Shanghai Kou Qiang Yi Xue ; 30(4): 419-423, 2021 Aug.
Artigo em Zh | MEDLINE | ID: mdl-34693438

RESUMO

PURPOSE: To analyze the relationship between upper airway and mandible morphology in patients with skeletal Class Ⅱ malocclusion with cone-beam CT (CBCT). METHODS: Thirty-three volunteers with individual normal occlusion and thirty-three patients with skeletal Class Ⅱ malocclusion were selected to undergo CBCT. All samples were outputted to Dicom and reconstructed using Mimics 19.0 medical software. SPSS 19.0 software package was used to analyze the differences between the two groups. Correlation between the two groups was evaluated using Pearson's coefficient analysis. RESULTS: Fifteen parameters showed significant difference between individual normal occlusion and the skeletal Class Ⅱ malocclusion(P<0.05). There were 10 significant correlational parameters between mandible length and upper airway of the skeletal Class Ⅱ malocclusion group. There were 13 significant correlational parameters between the arch width of the maxilla and upper airway of the skeletal Class Ⅱ malocclusion group. There were 3 significant correlational parameters between the arch width of the mandible and upper airway of the skeletal Class Ⅱ malocclusion group. CONCLUSIONS: The upper airway morphology of skeletal Class Ⅱ malocclusion is correlated with maxillary and mandibular parameters..


Assuntos
Má Oclusão Classe III de Angle , Má Oclusão Classe II de Angle , Má Oclusão , Adulto , Cefalometria , Tomografia Computadorizada de Feixe Cônico , Humanos , Má Oclusão Classe II de Angle/diagnóstico por imagem , Mandíbula/diagnóstico por imagem , Maxila/diagnóstico por imagem
4.
J Plast Reconstr Aesthet Surg ; 74(10): 2622-2628, 2021 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-33952433

RESUMO

BACKGROUND: Digital technology has been widely used in mandibular curved osteotomy to improve accuracy. However, the planning process still highly dependent on the experience and judgement of the surgeon. This study describes an automatic method to design the new gonion and osteotomy line based on the aesthetic standards in attractive women, and assesses its clinical outcomes. METHODS: An automatic surgical planning method for mandibular curved osteotomy was developed based on our previous research of mandibular angle aesthetics. A prospective clinical study was conducted from April 2016 to April 2018. Twenty-five female patients with prominent mandibular angle were enrolled. Pre- and postoperative skull computed tomography (CT) was performed. Three-dimensional (3D) CT data were obtained and processed by Mimics 18.0. Surgical templates were designed according to the automatic surgical planning method and 3D printed for the surgery. Preoperative measurements, surgical simulation and postoperative measurements were taken to evaluate the surgical outcomes. RESULTS: There were significant differences between the preoperative and the postoperative groups' results (p < 0.01). There was no difference between the surgical simulation and the postoperative results. All postoperative measurements were consistent with aesthetic features of mandibles. Patients were satisfied with their outcomes in terms of outline, symmetry and lower facial width. CONCLUSIONS: Our study developed an automatic method to position the new aesthetic gonion and osteotomy line for prominent mandibular angle patients. We proved that this method is safe, effective and reliable.


Assuntos
Técnicas Cosméticas , Mandíbula/cirurgia , Osteotomia Mandibular/métodos , Cirurgia Assistida por Computador , Adolescente , Adulto , Automação , Simulação por Computador , Estética , Feminino , Humanos , Imageamento Tridimensional , Mandíbula/anormalidades , Mandíbula/diagnóstico por imagem , Satisfação do Paciente , Período Pós-Operatório , Período Pré-Operatório , Impressão Tridimensional , Crânio/diagnóstico por imagem , Tomografia Computadorizada por Raios X , Adulto Jovem
5.
Shanghai Kou Qiang Yi Xue ; 18(6): 656-60, 2009 Dec.
Artigo em Zh | MEDLINE | ID: mdl-20143033

RESUMO

The crown inclination, representing an angle formed by the clinical crown axis and a line which bears 90 degrees to the occlusal plane, reflects the labiolingual or buccolingual inclination of the long axis of the crown. The crown inclination is related to the races. And it is compensated by different vertical or sagittal jaw relationships. It plays an important role in fine occlusal relationship and achieving functional, artistic and stable treatment goal. The torque design of the straight wire bracket is based on the normal crown inclination. There is much discrepancy in the torque design of the different straight wire bracket because of the different race and philosophy. This review gave a brief introduction of the influential factors, the clinical meaning of the crown inclination and the torque design of the different bracket system.


Assuntos
Coroas , Braquetes Ortodônticos , Oclusão Dentária , Humanos , Coroa do Dente , Torque
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