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1.
Dental Press J Orthod ; 26(1): e211928, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-33759965

RESUMO

OBJECTIVE: To study the influence of black space between the maxillary central incisors on the aesthetic visual perception of the face, via eye-tracking and visual analogue scale (VAS). METHODS: Black space between the central incisors was created, for both sexes, as follows: control, 1-mm black space, 2-mm black space and 3-mm black space. Ninety raters participated in this study, divided into three groups: 30 laypeople, 30 nonorthodontists, and 30 orthodontists. After the visual calibration of each observer, eight photographs were presented in the Ogama® software concomitant with the use of the hardware The Eye Tribe®. Ogama generated information depending on the eye-tracking of each rater, regarding the time until the first fixation, time of fixation, heatmap, scanpath, and total time of fixation, to evaluate the areas deemed to be of interest according to the raters. Later on, the VAS was used, where each rater evaluated the images in an album on a scale of zero to 10 points. RESULTS: The eyes and mouth were the areas more often noticed by the raters according to the heatmaps, while no significant difference was observed in time until the first fixation between the three groups of raters (p> 0.05). However, regarding the time of fixation on the mouth, a significant difference was observed (p< 0.05) when comparing the three groups. CONCLUSION: Black space has a negative effect on the aesthetic perception of the face. The amount of attention on the mouth is correspondent to the size of the black space.


Assuntos
Estética Dentária , Incisivo , Afro-Americanos , Feminino , Humanos , Incisivo/anatomia & histologia , Incisivo/diagnóstico por imagem , Masculino , Sorriso , Escala Visual Analógica
2.
Medicine (Baltimore) ; 99(43): e22778, 2020 Oct 23.
Artigo em Inglês | MEDLINE | ID: mdl-33120788

RESUMO

BACKGROUND: To analyze the sagittal positions of the mandibular prominence and maxillary central incisors in adult Chinese Han men to establish their aesthetic profile characteristics. METHODS: Seventy-four Chinese Han men aged 18 to 40 years underwent cone beam computed tomography for detecting the distances between Glabella and Subnasale, Subnasale and Menthon of soft tissue, Condyle and Gonion, Pogonion and Pogonion's Anterior Limit Line, Facial Axis point of maxillary central incisor and the Goal Anterior Limit Line as well as the angle of the Occlusal Plane. Dolphin Imaging and Photoshop software packages were used to generate silhouette profiles. Thirteen orthodontists assessed the silhouette profiles and assigned visual analog scale scores. Scores >70 were assigned to the aesthetic (group 1), scores of 60to 70 to the general (group 2), scores of 50 to 60 to the acceptable (group 3), and scores of <50 to the unaesthetic profile (group 4). RESULTS: A total of 15 men were assigned to group 1, 35 to group 2, 14 to group 3, and 10 to group 4. There were no significant differences in the variables examined between groups 1, 2, and 3, but comparing group 1 with group 4, Pogonion and Pogonion's Anterior Limit Line (1.16 ±â€Š2.61 mm vs -1.44 ±â€Š2.92 mm, P = .046) and Facial Axis-Goal Anterior Limit Line (-0.61 ±â€Š2.54 mm vs 1.70 ±â€Š2.62 mm, P = .038) there were significant differences. CONCLUSION: Compared with the unaesthetic profile group, the sagittal positions of the maxillary central incisors were slightly posterior, and the chin was slightly anterior in adult Chinese Han men with an aesthetic profile.


Assuntos
Grupos Étnicos , Incisivo/anatomia & histologia , Incisivo/diagnóstico por imagem , Maxila/anatomia & histologia , Maxila/diagnóstico por imagem , Adolescente , Adulto , Cefalometria/métodos , Queixo/anatomia & histologia , Queixo/diagnóstico por imagem , China , Tomografia Computadorizada de Feixe Cônico/métodos , Humanos , Masculino , Mandíbula/anatomia & histologia , Mandíbula/diagnóstico por imagem , Estudos Prospectivos , Valores de Referência , Adulto Jovem
3.
Acta Odontol Latinoam ; 33(1): 22-26, 2020 Apr 01.
Artigo em Inglês | MEDLINE | ID: mdl-32621595

RESUMO

Cone Beam Computed Tomography (CBCT) has modified the perspective of dentistry images, providing manipulable threedimensional images with a 1:1 patient:image ratio. Treatments and diagnosis are modified or corroborated by CBCT; however, its accuracy in thin structures such as cortical bone has been subjected to critical review. The aim of this study is to correlate the measurement of vestibular alveolar bone height using direct measurements and measurements performed with cone-beam tomographic images with standard (SD) voxel resolution. Thirty incisor and premolar teeth of patients undergoing open curettage were measured with a high-precision caliper and with Cone Beam Computed Tomography (CBCT) at an SD resolution of 0.16 mm voxels in a 3D Orthophos XG Sirona scanner. Intra-observer evaluation was performed using the intraclass correlation coefficient (ICC). Direct measurements and CBCT measurements were correlated using Pearson correlation (PCC). The mean difference between indirect and direct measurements was 3.15 mm. Paired t test and Pearson Correlation coefficient determined that all measurements differed statistically from each other with p<0.05. With the CT scanner and protocol used in this study, CBCT images do not enable accurate evaluation of vestibular alveolar bone height.


Assuntos
Processo Alveolar/diagnóstico por imagem , Dente Pré-Molar/diagnóstico por imagem , Tomografia Computadorizada de Feixe Cônico/normas , Incisivo/diagnóstico por imagem , Processo Alveolar/anatomia & histologia , Dente Pré-Molar/anatomia & histologia , Tomografia Computadorizada de Feixe Cônico/métodos , Precisão da Medição Dimensional , Humanos , Incisivo/anatomia & histologia , Reprodutibilidade dos Testes
4.
Acta Odontol Latinoam ; 33(1): 33-37, 2020 Apr 01.
Artigo em Inglês | MEDLINE | ID: mdl-32621597

RESUMO

This study evaluated the internal morphology of lower incisors using computerized microtomography (micro-CT) images. Eighty-nine lower incisors were scanned by micro-CT and reconstructed with NRecon software. 2D parameters (perimeter, root length, circularity and canal diameter) and 3D parameters (volume, surface area and structure model index) were evaluated with CTAn and CTVol software. The results are presented descriptively. It was found that 89.9% of the canals had a single main root canal (type I), followed by type II (6.7%) and III (3.4%), while 5.6% of the specimens presented lateral canals and 1.1% had an apical delta. Mean volume and surface area were 31.80mm³ and 90.58mm², respectively. The most prevalent shape of the root canal at CEJ level was circular (41.6%) and 1mm from the apex, 73% of the samples were classified as oval. Lower incisors with internal anatomical variations may offer a high degree of technical complexity and may result in treatment failure.


Assuntos
Cavidade Pulpar/diagnóstico por imagem , Incisivo/anatomia & histologia , Mandíbula , Microtomografia por Raio-X/métodos , Humanos , Processamento de Imagem Assistida por Computador , Incisivo/diagnóstico por imagem
5.
J. oral res. (Impresa) ; 9(2): 93-97, abr. 30, 2020. ilus, tab
Artigo em Inglês | LILACS | ID: biblio-1151849

RESUMO

Objective: To determine regression models to predict the mesiodistal widths of the maxillary anterior teeth from interalar width of the nose in subjects with facial harmony. Materials and Methods: A cross-sectional study was carried out in a sample of 75 subjects with facial harmony and ages ranging from 18 to 30 years (21.28±3.75 years). The mesiodistal width of the central (CI), lateral (LI) incisors, and canines (C), as well as the interalar width (IW) of each subject were measured using a digital vernier caliper. Simple linear regression analyses were used to predict the width of the maxillary anterior teeth from the nasal interalar width, from which formulas for predicting the dimensions of each anterior tooth were obtained. Results: A statistically significant relationship was found between the nasal interalar width and the mesiodistal widths of the upper central incisor (p=0.019, R2=5.23%), upper lateral incisor (p=0.019, R2=2.31%), and upper canine (p=0.016, R2=12.04%) that allowed to develop simple linear prediction models for each tooth represented by the following formulas: CI=7.04+0.04(IW); LI=6.01+0.03 (IW); C=6.19+0.05 (IW). Conclusion: The nasal interalar width is a good predictor of the mesiodistal widths of the maxillary anterior teeth.


Objectivo: Determinar modelos de regresión para predecir los anchos mesiodistales de los dientes anterosuperiores a partir del ancho interalar de la nariz en individuos con armonía facial. Materiales and Métodos: Se realizó un estudio transversal con una muestra de 75 sujetos con armonía facial entre 18 a 30 años (21.28 ± 3.75 años), se midió el ancho mesiodistal de incisivos centrales (IC), laterales (IL) y caninos (C) así como el ancho interalar (AI) de cada sujeto empleando un calibrador vernier digital. Para la predicción del ancho de los dientes anterosuperiores a partir del ancho interalar nasal se emplearon análisis de regresión lineal simple, a partir de los cuales se obtuvieron fórmulas de predicción de las dimensiones de cada pieza dentaria anterior. Resultados: Se encontró relación estadísticamente significativa entre el ancho interalar nasal y los anchos mesiodistales del incisivo central superior (p=0.019, R2 5.23%), incisivo lateral superior (=0.019, R2=2.31%) y canino superior (p=0.016, R2=12.04%) que permitieron generar modelos de predicción lineal simple para cada pieza dentaria representados mediante las siguientes fórmulas: IC=7.04+0.04(AI); IL=6.01+0.03(AI); C=6.19+0.05(AI). Conclusión:El ancho interalar nasal es un buen predictor de los anchos mesiodistales de los dientes anterosuperiores.


Assuntos
Humanos , Masculino , Feminino , Adolescente , Adulto , Adulto Jovem , Nariz/anatomia & histologia , Dente Canino/anatomia & histologia , Incisivo/anatomia & histologia , Maxila/anatomia & histologia , Peru , Modelos Lineares , Estudos Transversais , Análise de Regressão
6.
BMJ Case Rep ; 13(3)2020 Mar 12.
Artigo em Inglês | MEDLINE | ID: mdl-32169975

RESUMO

Mandibular incisors show variations in their root canal anatomy from regular pattern in some cases. Magnification plays a vital role to identify those unusual canal morphologies. A certain modification in access cavity preparation is required to locate those extra canals. Not only the functional restoration but also aesthetic harmony should be restored while treating anterior teeth. In these cases, post space preparation should be done with extra care to prevent vertical root fracture. This case report illustrates the importance of proper radiograph and magnification in the successful identification and management of complex canal systems in mandibular incisors.


Assuntos
Resinas Acrílicas/uso terapêutico , Resinas Compostas/uso terapêutico , Cavidade Pulpar/diagnóstico por imagem , Incisivo/lesões , Poliuretanos/uso terapêutico , Fraturas dos Dentes/diagnóstico por imagem , Coroas/normas , Cavidade Pulpar/anatomia & histologia , Estética , Humanos , Incisivo/anatomia & histologia , Masculino , Traumatismos Mandibulares/complicações , Radiografia/métodos , Tratamento do Canal Radicular/métodos , Fraturas dos Dentes/terapia , Raiz Dentária/anatomia & histologia , Resultado do Tratamento , Adulto Jovem
7.
BMC Oral Health ; 20(1): 59, 2020 02 19.
Artigo em Inglês | MEDLINE | ID: mdl-32075626

RESUMO

BACKGROUND: In this study, we conducted a quantitative analysis of the clinical parameters of crown and gingival morphology (CGM) of the maxillary anterior teeth (MAT). We also analyzed the correlation of these parameters with periodontal biotype (PB), with a view to providing objective standards for PB diagnosis. METHODS: The three-dimensional (3D) maxillary digital models of 56 individuals were obtained using an intra-oral scanner. The following parameters were measured with the SpaceClaim software: gingival angle (GA), papilla width (PW), papilla height (PH), crown length (CL), crown width (CW), crown width/crown length ratio (CW/CL), bucco-lingual width of the crown (BLW), contact surface width (CSW), and contact surface height/crown length ratio (CS/CL). The PB were determined based on the transparency of the periodontal probe through the gingival sulcus. Independent factors influencing PB were analyzed by logistic regression, and the optimal cutoff values for the independent influencing factors were analyzed using receiver operating characteristic curves (ROC curves). RESULTS: There was no significant difference in the parameters of CGM of the MAT at the left and right sides. The thick biotype accounted for 69.6%, and the parameters of GA, PW, PH, CW, CW/CL and CS/CL were significantly correlated with PB (P ≤ 0.2). GA (odds ratio (OR) = 1.206) and PW (OR = 5.048) were identified as independent predictive factors of PB, with areas under the ROC curve (AUC) of 0.807 and 0.881, respectively, and optimal cutoff values of 95.95° and 10.01 mm, respectively. CONCLUSION: The CGMs of the MAT at the left and right side are symmetrical. The thin biotype accounts for a small proportion, and GA and PW are independent influencing factors of PB. GA of 95.95° and PW of 10.01 mm are the optimal cutoff values for categorization of individuals as thick biotype. This indicates that when the GA and PW of the right maxillary central incisor are G ≥ 95.95° and ≥ 10.01 mm, respectively, there is a higher probability that these individuals will be categorized as thick biotype.


Assuntos
Coroas , Gengiva/anatomia & histologia , Incisivo/anatomia & histologia , Humanos , Maxila/anatomia & histologia , Periodontia/instrumentação , Coroa do Dente/anatomia & histologia
8.
Plast Reconstr Surg ; 145(3): 524e-529e, 2020 03.
Artigo em Inglês | MEDLINE | ID: mdl-32097304

RESUMO

BACKGROUND: The depressor septi nasi is a facial muscle with many different descriptions of its anatomy. Therefore, the aim of this study was to clarify the relationship of the depressor septi nasi, incisivus labii superioris, and surrounding structures. METHODS: Twenty sides from 10 fresh-frozen cadaveric heads were used in this study. The depressor septi nasi and incisivus labii superioris were dissected intraorally and extraorally, and the relationship with surrounding structures was observed. RESULTS: Eighteen of 20 sides had a depressor septi nasi. When present, the depressor septi nasi originated from the orbicularis oris above the central incisor and the medial portion of the inferior part of the incisivus labii superioris and inserted into the base of the medial crus of the major alar cartilage and nasal septum. These three muscles were three-dimensionally fused at the insertion point of the depressor septi nasi. There was no specimen where the depressor septi nasi originated directly from the maxilla. The depressor septi nasi runs obliquely from the nasal septum and the base of the medial crus of the major alar cartilage to the orbicularis oris and inferior part of the incisivus labii superioris. CONCLUSION: A better understanding of the depressor septi nasi, incisivus labii superioris, and surrounding structures might be important during various surgical techniques, especially rhinoplasty.


Assuntos
Músculos Faciais/anatomia & histologia , Lábio/anatomia & histologia , Septo Nasal/anatomia & histologia , Rinoplastia/métodos , Idoso , Idoso de 80 Anos ou mais , Cadáver , Músculos Faciais/cirurgia , Feminino , Humanos , Incisivo/anatomia & histologia , Lábio/cirurgia , Masculino , Pessoa de Meia-Idade , Septo Nasal/cirurgia
9.
Medicine (Baltimore) ; 99(2): e18069, 2020 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-31914012

RESUMO

This study aims to find and locate foramens exactly in maxilla and mandible in case of complications during surgeries.Computer topographic angiography (CTA) images of 120 cases were reviewed. The measurements were performed on coronal, sagittal and axial planes after the 3 dimension volume reconstruction. The distances among foramens, bony landmarks, teeth, and facial artery were all measured with the angles as adjustments.The incisive foramen (IF) was measured 20.55 ±â€Š2.81 mm to margo inferior of incisor, and 45.27 ±â€Š5.27 degree from the axial midline. The greater palatine foramen located 43.17 ±â€Š2.55 mm from the IF, while 21.08 ±â€Š3.75 degree from the midline in axial plane. The lesser palatine foramina located 44.56 ±â€Š5.74 mm from the IF and 20.05 ±â€Š3.59 degree to the midline. The Mandibular foramen (MBF) was 91.15 ±â€Š1.86 mm horizontally to the margo inferior of incisor. The angle that the MBF-margo inferior of incisor line made with the axial midline was 31.25 ±â€Š2.89 degree. The shortest horizontal distance from the mental foramen (MF) to the facial artery in sagittal plane was 21.90 ±â€Š1.86 mm, while it became 13.00 ±â€Š2.05 mm in coronary section. The horizontal distance from the MF to the margo inferior of incisor in sagittal plane was 22.04 ±â€Š3.22 mm. It turned out to be 25.78 ±â€Š5.23 mm between MF and mid-sagittal line in coronary section. The vertical distance was 25.20 ±â€Š3.06 mm from the upper margin of the second premolar to the MF.The foramens were clearly seen through CTA. Moreover, linear and angular measurements were presented, which makes it safer and wiser for surgeons to consider the biometric data before operations.


Assuntos
Pontos de Referência Anatômicos/diagnóstico por imagem , Angiografia por Tomografia Computadorizada/métodos , Mandíbula/anatomia & histologia , Forame Mentual/diagnóstico por imagem , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Artérias , Osso e Ossos/diagnóstico por imagem , Osso e Ossos/cirurgia , Criança , Face/irrigação sanguínea , Face/diagnóstico por imagem , Feminino , Humanos , Incisivo/anatomia & histologia , Incisivo/diagnóstico por imagem , Masculino , Mandíbula/diagnóstico por imagem , Mandíbula/patologia , Mandíbula/cirurgia , Forame Mentual/cirurgia , Pessoa de Meia-Idade , Adulto Jovem
10.
Int J Oral Sci ; 12(1): 4, 2020 01 14.
Artigo em Inglês | MEDLINE | ID: mdl-31932579

RESUMO

The morphology of the alveolar bone at the maxillary anterior teeth in periodontitis patients was evaluated by cone-beam computed tomography (CBCT) to investigate the distribution of alveolar defects and provide guidance for clinical practice. Ninety periodontitis patients and 30 periodontally healthy individuals were selected to determine the morphology of the alveolar bone at the maxillary anterior teeth according to the degree of bone loss, tooth type, sex and age. The differences in the dimensions between periodontitis patients and healthy individuals were compared, and the distribution of alveolar bone defects was analyzed. A classification system was established regarding the sagittal positions and angulations of the teeth. The buccal residual bone was thicker and the lingual bone was thinner in the periodontitis patients than in the periodontally healthy individuals, and there were differences between the different tooth types, sexes and age subgroups. The buccal undercut was close to the alveolar ridge, while fenestration was reduced and the apical bone height was higher in periodontitis patients than in periodontally healthy individuals. The apical bone height increased with the aggravation of bone loss and age. The proportions of different sagittal positions changed with the aggravation of bone loss. Moreover, the teeth moved more buccally regarding the positions of the maxillary anterior teeth. The morphology of the alveolar bone at the maxillary anterior teeth differed between periodontitis patients and healthy individuals, and the differences were related to the degree of bone loss, tooth type, sex and age.


Assuntos
Processo Alveolar/diagnóstico por imagem , Tomografia Computadorizada de Feixe Cônico/métodos , Incisivo/diagnóstico por imagem , Maxila/diagnóstico por imagem , Periodontite/diagnóstico por imagem , Adulto , Processo Alveolar/anatomia & histologia , Feminino , Humanos , Incisivo/anatomia & histologia , Masculino , Maxila/anatomia & histologia , Estudos Retrospectivos , Ápice Dentário/anatomia & histologia , Ápice Dentário/diagnóstico por imagem , Colo do Dente/anatomia & histologia , Colo do Dente/diagnóstico por imagem
11.
PLoS One ; 14(11): e0224573, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31774826

RESUMO

Early modern humans (EMH) are often touted as behaviorally advanced to Neandertals, with more sophisticated technologies, expanded resource exploitation, and more complex clothing production. However, recent analyses have indicated that Neandertals were more nuanced in their behavioral adaptations, with the production of the Châtelperronian technocomplex, the processing and cooking of plant foods, and differences in behavioral adaptations according to habitat. This study adds to this debate by addressing the behavioral strategies of EMH (n = 30) within the context of non-dietary anterior tooth-use behaviors to glean possible differences between them and their Neandertal (n = 45) counterparts. High-resolution casts of permanent anterior teeth were used to collect microwear textures of fossil and comparative bioarchaeological samples using a Sensofar white-light confocal profiler with a 100x objective lens. Labial surfaces were scanned, totaling a work envelope of 204 x 276 µm for each individual. The microwear textures were examined for post-mortem damage and uploaded to SSFA software packages for surface characterization. Statistical analyses were performed to examine differences in central tendencies and distributions of anisotropy and textural fill volume variables among the EMH sample itself by habitat, location, and time interval, and between the EMH and Neandertal samples by habitat and location. Descriptive statistics for the EMH sample were compared to seven bioarchaeological samples (n = 156) that utilized different tooth-use behaviors to better elucidate specific activities that may have been performed by EMH. Results show no significant differences between the means within the EMH sample by habitat, location, or time interval. Furthermore, there are no significant differences found here between EMH and Neandertals. Comparisons to the bioarchaeological samples suggest both fossil groups participated in clamping and grasping activities. These results indicate that EMH and Neandertals were similar in their non-dietary anterior tooth-use behaviors and provide additional evidence for overlapping behavioral strategies employed by these two hominins.


Assuntos
Comportamento/fisiologia , Fósseis/anatomia & histologia , Incisivo/anatomia & histologia , Homem de Neandertal/anatomia & histologia , Desgaste dos Dentes/etiologia , Animais , Antropologia Física , Fenômenos Biomecânicos , Ecossistema , Humanos , Incisivo/diagnóstico por imagem , Incisivo/fisiologia , Mastigação/fisiologia , Homem de Neandertal/fisiologia , Propriedades de Superfície , Desgaste dos Dentes/diagnóstico por imagem
12.
Niger J Clin Pract ; 22(11): 1611-1616, 2019 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-31719285

RESUMO

Aims: To investigate the root canal's anatomy, gender differences, and bilateral symmetry of permanent mandibular incisors using cone-beam computed tomography (CBCT). Materials and Methods: A total of 208 patients with 822 well-developed mandibular incisors were evaluated. CBCT images were retrieved from the database of patients who received treatment in the College of Dentistry and Dental Clinics. The following parameters were evaluated using CBCT: (1) the number of roots; (2) the number of canals; (3) canal configuration according to Vertucci's classification; (4) differences between genders; and (5) bilateral symmetry. Results: Two canals appeared in 26.3% of mandibular central incisors, 30.8% of lateral incisors, and 28.6% of all the 822 mandibular incisors. In the teeth with two canals, Type III configuration was dominant. There were no statistically significant differences found between the central and lateral incisors (P = 0.449). There were gender differences in central incisors, while lateral incisors showed none. Slight bilateral asymmetries appeared in central and lateral incisors in relation to some canals and canals configurations. Conclusion: CBCT can be of great use in locating the second canal and determining canal configuration in mandibular incisors. Knowledge of bilateral asymmetry can be of clinical significance when the clinician is treating contralateral teeth in the same patient.


Assuntos
Tomografia Computadorizada de Feixe Cônico/métodos , Cavidade Pulpar/diagnóstico por imagem , Incisivo/diagnóstico por imagem , Mandíbula/diagnóstico por imagem , Raiz Dentária/diagnóstico por imagem , Adulto , Cavidade Pulpar/anatomia & histologia , Feminino , Humanos , Incisivo/anatomia & histologia , Masculino , Mandíbula/anatomia & histologia , Pessoa de Meia-Idade , Arábia Saudita , Fatores Sexuais , Raiz Dentária/anatomia & histologia
13.
Am J Orthod Dentofacial Orthop ; 156(4): 485-492, 2019 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-31582120

RESUMO

INTRODUCTION: The aim of this study was to investigate whether there is any influence on the perception of smile esthetics among orthodontists and laypersons, with regard to different vertical positions of the maxillary central incisors. METHODS: Frontal smile photographs digitally altered at full-face view and close-up view of 2 adult men aged between 20 and 30 years were used. Six vertical positions of the central incisors were created, with changes of 0.5 mm. The images were randomly assembled in an album that was presented to 53 orthodontists and 53 laypersons, who evaluated the attractiveness of the images by using visual analog scales. Comparison among the images was performed using 1-way analysis of variance, with Tukey post-hoc test. To compare the distribution of the mean scores between the full-face and close-up smile views, and between orthodontists and laypersons, the Student t test was used. The level of significance was established at 5%. RESULTS: The best evaluations presented the following: (a) the gingival margins of the central incisors corresponded to, or were up to, 1 mm below the line of the canine gingival margins, and (b) the incisal step between the central and lateral incisors was from 1.0 to 2.0 mm. The smiles considered least attractive showed (a) the central incisor gingival margins were 1.0 mm above or 1.5 mm below the canine gingival margins, and (b) no step, or a step of 2.5 mm, between the central and lateral incisors. CONCLUSIONS: The results of this study suggested that, in men, slightly extruded central incisors were esthetically more attractive than intruded incisors.


Assuntos
Estética Dentária/psicologia , Gengiva/anatomia & histologia , Incisivo/anatomia & histologia , Maxila/anatomia & histologia , Ortodontistas/psicologia , Sorriso/psicologia , Adulto , Atitude do Pessoal de Saúde , Atitude Frente a Saúde , Humanos , Masculino , Percepção , Fotografação , Escala Visual Analógica
14.
Prensa méd. argent ; 105(9 especial): 538-545, oct 2019. graf, fig
Artigo em Inglês | LILACS, BINACIS | ID: biblio-1046465

RESUMO

The incisive canal and its contents are often subject to intervention in maxillofacial surgery, otorhinolaryngology, and various areas of dentistry. The purpose of this paper is to study the variability of the dimensional and topographic characteristics of the incisive and nasal foramina of the incisive canal depending on the gender, shape, and parameters of the craniofacial complex in the first adult age. The authors have studied the parameters of the craniofacial complex, such as the morphological facial height, the upper morphological facial height, and the morphological facial breadth. They also have determined the Garson facial index and the upper face index. Cone-beam computerized tomography has been used in order to determine the number of foramina of Stensen and incisive foramina, their mesiodistal and vestibulo-lingual diameters, the shape of the incisive foramen; the distance from the incisive foramen to the labial inferior and palatal inferior points of the alveolar process; the distance from the incisive foramen to the central incisors, lateral incisors, canines of the maxilla; the bone density around the incisive canal; the length, shape, and type of incisive canal. Quantitative data were processed by variational statistical methods using the Statistica software package for Windows v 10.0. The significance of differences between groups was assessed using the Kolmogorov- Smirnov criterion at a significance level of p<0.05. It has been discovered that the incisive canal, the nasal and incisive foramina had a pronounced individual variability in size, shape, and topography depending on the gender, shape, the Garson facial index and upper face index, as well as the presence of correlations between the diameters and the number of nasal and incisive foramina. The authors have determined the values of bone tissue density in the area of the nasal and incisive foramina.


Assuntos
Humanos , Adulto , Densidade Óssea , Topografia , Cefalometria , Estatísticas não Paramétricas , Tomografia Computadorizada de Feixe Cônico , Incisivo/anatomia & histologia
15.
Homo ; 70(3): 185-192, 2019 Nov 11.
Artigo em Inglês | MEDLINE | ID: mdl-31486821

RESUMO

The aim was to analyze the changes in mandibular dental arch shape during adolescence and assess its relation to late mandibular incisor crowding. Longitudinal study included 68 orthodontically untreated subjects (49% female) and analyzed their data for the ages of 12, 15, 18 and 21 years. Measurements included anterior arch depth, intercanine, interpremolar/anterior and intermolar/posterior width, Little's Irregularity and Bolton's index and the ratio between anterior arch depth and width. Males had significantly greater posterior widths than females at any age (p < 0.05). The anterior arch depth continuously decreased (p < 0.05), while width increased after the age of 18 years. Mandibular incisor crowding increased during all investigated periods (p < 0.05). The increase of intercanine width at 12-21 years of age reduced the risk for mandibular incisor crowding in the same period by 74% (OR: 0.265: 95% CI 0.076-0.931; p = 0.045). The shape of mandibular dental arch continues to change during adolescence becoming more squared while mandibular incisor crowding increases. The increase in mandibular intercanine width reduces the risk of crowding.


Assuntos
Arco Dental , Incisivo , Má Oclusão/patologia , Adolescente , Adulto , Antropologia Física , Criança , Arco Dental/anatomia & histologia , Arco Dental/crescimento & desenvolvimento , Arco Dental/patologia , Feminino , Humanos , Incisivo/anatomia & histologia , Incisivo/patologia , Estudos Longitudinais , Masculino , Odontometria , Adulto Jovem
16.
Homo ; 70(2): 147-154, 2019 Oct 24.
Artigo em Inglês | MEDLINE | ID: mdl-31486824

RESUMO

The aim of this study was to compare the prevalence of anatomical variants of maxillary lateral incisors in archaeological and modern populations from the Maya region. Both populations were derived from the state of Yucatan, Mexico. The archaeological sample consisted of human remains representing 122 individuals from the ancient Maya archaeological site of Xcambo (AD 250-700). The modern sample consisted of 475 dental models from the municipality of Tahdziú, Yucatan. The anatomical variants evaluated included microdontia, barrel-shaped incisors, and talon cusp. The prevalence of each anatomical variant for each population was calculated and compared (Fisher p < 0.05). The prevalence of anatomical variants was 15.57% (n = 19) in the archaeological sample and 14.11% (n = 67) in the modern one; the difference was not significant (p = 0.666). When compared by specific anatomical variants, a significant (p = 0.013) association was observed for microdontia: 2.45% (n = 3) in the archaeological population and 9.05% (n = 43) in the modern population. Barrel-shaped incisors (p = 0.522) and talon cusp (p = 0.466) did not exhibit significant associations. The overall prevalence of anatomical variants in the maxillary lateral incisors in this region has not changed. The prevalence of microdontia has increased over the last 1500 years, and different microevolutionary processes may be called into question for such change.


Assuntos
Incisivo/anatomia & histologia , Incisivo/patologia , Maxila/anatomia & histologia , Anormalidades Dentárias/patologia , Arqueologia , História Antiga , História Medieval , Humanos , México , Paleodontologia , Anormalidades Dentárias/história
17.
Am J Orthod Dentofacial Orthop ; 156(3): 345-354, 2019 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-31474264

RESUMO

INTRODUCTION: Orthodontic mini-implants are frequently used to provide additional anchorage for orthodontic appliances. The anterior palate is frequently used owing to sufficient bone quality and low risk of iatrogenic trauma to adjacent anatomical structures. Even though the success rates in this site are high, failure of an implant will result in anchorage loss. Therefore, implants should be placed in areas with sufficient bone quality. The aim of the present study was to identify an optimal insertion angle and position for orthodontic mini-implants in the anterior palate. METHODS: Maxillary cone-beam computed tomographic (CBCT) scans from 30 patients (8 male, 22 female, age 18.6 ± 12.0 years) were analyzed. To assess the maximum possible length of an implant, a 25-reference-point grid was defined: 5 sagittal slices were extracted along the median plane and bilaterally at 3 mm and 6 mm distances, respectively. Within each slice, 5 dental reference points were projected to the palatal curvature at the contact point between the cuspid (C) and first bicuspid (PM1), midpoint of PM1, between PM1 and PM2, midpoint of PM2, and between PM2 and the first molar (M1). Measurements were conducted at -30°, -20°, -10°, 0°, 10°, 20°, and 30° to a vector placed perpendicular to the local palatal curvature. Statistical analysis was conducted with the use of R using a random-effects mixed linear model and a Tukey post hoc test with Holm correction. RESULTS: High interindividual variability was detected. Maximum effective bone heights were detected within a T-shaped area at the midpoint of PM1 and contact point PM1-PM2 (P < 0.01). Within the anterior region a posterior tipping was advantageous, whereas in the posterior regions an anterior tipping was beneficial (P < 0.01). In the middle of the median plane, tipping did not reveal a significant influence. No gender- or age-related differences were observed. CONCLUSIONS: Within the limitations of this study, optimal insertion positions were found within a T-shaped area at the height of PM1-PM2 in the anterior palate. In general, a posterior tipping was beneficial at anterior positions, and an anterior tipping appeared beneficial at posterior positions. High interindividual variation was found and should be carefully considered by the clinician.


Assuntos
Tomografia Computadorizada de Feixe Cônico/métodos , Implantes Dentários , Maxila/anatomia & histologia , Maxila/diagnóstico por imagem , Procedimentos de Ancoragem Ortodôntica/métodos , Palato/anatomia & histologia , Palato/diagnóstico por imagem , Adolescente , Adulto , Análise de Variância , Dente Pré-Molar , Parafusos Ósseos , Criança , Estudos Transversais , Dente Canino , Feminino , Humanos , Incisivo/anatomia & histologia , Incisivo/diagnóstico por imagem , Masculino , Maxila/cirurgia , Dente Molar , Osso Nasal/anatomia & histologia , Osso Nasal/diagnóstico por imagem , Procedimentos de Ancoragem Ortodôntica/instrumentação , Desenho de Aparelho Ortodôntico , Palato/cirurgia , Adulto Jovem
18.
Forensic Sci Int ; 303: 109928, 2019 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-31493659

RESUMO

Out of all the available methods for estimating age at death from immature human skeletal remains, those based on odontometric variables of deciduous dentition have proved to be one of the most accurate. The development of odontometric methods has been improved through the creation of documented human osteological collections, allowing their validation in different populations. The present study aims to test the regression equations for age estimation proposed by Liversidge et al. 1993, Irurita Olivares et al. 2014, and Cardoso et al. 2019, on the basis of the maximum length of deciduous teeth in an Argentinian sample of 35 infants of known age at death. The results showed that the absolute mean difference between estimated and chronological age was 5.76±6.33 weeks for Liversidge's method, 5.71±6.41 weeks for Irurita Olivares's method, and 6.79±5.80 for Cardoso's method. It was also found that, for Liversidge's method, the canines provided the most accurate and the least biased estimations. For Irurita Olivares's method, mandibular anterior teeth were the most accurate, while the first mandibular molars offered the least biased estimations. For Cardoso's method, the canines presented the most accurate estimations, while the lateral incisors the least biased ones. Finally, 95% confidence intervals of estimated ages were calculated for each method, finding that Irurita Olivares's method provided the most reliable age estimations when using mandibular central incisors and mandibular first molars.


Assuntos
Determinação da Idade pelos Dentes/métodos , Dente Decíduo , Argentina , Pré-Escolar , Dente Canino/anatomia & histologia , Feminino , Odontologia Legal , Humanos , Incisivo/anatomia & histologia , Lactente , Recém-Nascido , Masculino , Mandíbula , Dente Molar/anatomia & histologia , Análise de Regressão
19.
Comput Math Methods Med ; 2019: 7416076, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31379973

RESUMO

In some cases of proclined maxillary incisors, the proclination can be corrected by a fixed prosthesis. The aim of this study was to investigate the magnitude and distribution of (i) principal stresses in the adjacent alveolar bone and (ii) direct and shear stresses that are normal and parallel, respectively, to the bone-tooth interface of a normal angulated maxillary incisor, a proclined one, and a proclined one corrected with an angled prosthetic crown. 2D finite-element models were constructed, and a static load of 200 N on the palatal surface of the maxillary incisor at different load angles was applied. Load angles (complementary angle to interincisal angle) ranging from 20° to 90° were applied. The results indicate that the load angle could have a more significant impact on the overall stress distributions in the surrounding alveolar bone and along the bone-tooth interface than the proclination of the maxillary incisor. Provided that the resulting interincisal angle is 150° or smaller, the stresses in the surrounding bone and at the bone-tooth interface are similar between a proclined maxillary incisor and the one with prosthodontic correction. Hence, such a correction, when deemed appropriate clinically, can be undertaken with confidence that there is little risk of incurring additional stresses over that already in existence, in the supporting bone and at the tooth-bone interface.


Assuntos
Planejamento de Prótese Dentária , Prótese Dentária/instrumentação , Incisivo/anatomia & histologia , Maxila/anatomia & histologia , Algoritmos , Fenômenos Biomecânicos , Cefalometria , Simulação por Computador , Elasticidade , Análise de Elementos Finitos , Humanos , Incisivo/cirurgia , Modelos Lineares , Teste de Materiais , Maxila/cirurgia , Pressão , Software , Estresse Mecânico , Resistência à Tração
20.
J Appl Oral Sci ; 27: e20180722, 2019 Aug 12.
Artigo em Inglês | MEDLINE | ID: mdl-31411266

RESUMO

OBJECTIVES: Age estimation is one of the most important factors in forensic medicine. Measuring secondary dentin deposition using cone-beam computed tomography images is an easy and noninvasive method. The aim of this study was to evaluate cone-beam computed tomography images as a reliable method to estimate chronological age by pulp/teeth ratio in anterior teeth in Iranian population. METHODOLOGY: A total of 649 CBCT images from 377 Iranian patients aged between 20 and 69 years were evaluated. Pulp/teeth ratio (PTR) in maxillary and mandibular canine and central incisor teeth was measured in the axial and sagittal sections using OnDemand 3D Dental software. The Pearson correlation coefficient was determined to evaluate the correlation between the variables. Linear regression analysis, as well as age estimation formula, was used for each tooth separately. RESULTS: The regression analyses indicated that maxillary central incisors were more reliable for age estimation (R2=0.586 and standard error of estimate=7.045) compared with the other anterior teeth studied. Maxillary canine teeth had the lowest predictive power (R2=0.392 and standard error of estimate=8.387). Also, comparison of the axial and sagittal sections showed that the axial sections had a higher predictive power. (R2=0.48 for axial plans and R2=0.328 for sagittal plans). CONCLUSION: The use of cone-beam computed tomography in age estimation by pulp/teeth ratio of anterior teeth is useful and a reliable method for age estimation in Iranian population.


Assuntos
Determinação da Idade pelos Dentes/métodos , Tomografia Computadorizada de Feixe Cônico/métodos , Polpa Dentária/anatomia & histologia , Polpa Dentária/diagnóstico por imagem , Dente/anatomia & histologia , Dente/diagnóstico por imagem , Adulto , Fatores Etários , Idoso , Dente Canino/anatomia & histologia , Dente Canino/diagnóstico por imagem , Feminino , Humanos , Imageamento Tridimensional , Incisivo/anatomia & histologia , Incisivo/diagnóstico por imagem , Modelos Lineares , Masculino , Pessoa de Meia-Idade , Tamanho do Órgão , Valores de Referência , Reprodutibilidade dos Testes , Fatores Sexuais , Adulto Jovem
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