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2.
C R Biol ; 342(5-6): 199-208, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31474523

RESUMO

The wear on the occlusal surfaces of male babirusa cheek teeth was evaluated in 53 skulls of Babyrousa babyrussa from Buru and the Sula Islands and 87 skulls of B. celebensis from Sulawesi, Indonesia. Based on the comparative lengths of their continually growing maxillary canine teeth, the skulls were divided into five 'age categories' (A-E). Numerical and symbolic codes representing tooth wear were applied to each pillar (cusp region) of the mandibular and maxillary permanent third and fourth premolar teeth, and the first, second and third permanent molar teeth. There was no significant difference between the tooth wear patters of skulls in groups A and B, or in groups C and D, and so these were amalgamated. There was close correspondence in wear patterns between each side of the mouth in both species and in each age group. The wear patterns of the mandibular and maxillary teeth, although not identical, were very similar, as were the wear patterns of both species. In group A+B for both species tooth wear was relatively slight, with the M1 teeth experiencing most relative wear. There was almost no wear of the M3 teeth. In group C+D substantial wear of upper and lower M1 was evident. In group E more widespread wear of the cheek teeth was seen, with increased severity of M1 tooth wear, yet there was comparatively much less M2 and M3 tooth wear. The pattern of cheek tooth wear of the Babyrousa spp. was different from that shown by Susscrofa. Differences in diet selection and processing were highlighted as potential contributing factors. The pattern of cheek tooth wear in male babirusa was not adequate for use to monitor their age.


Assuntos
Determinação da Idade pelos Dentes/métodos , Suínos , Erosão Dentária/patologia , Animais , Dente Canino/patologia , Dieta , Masculino , Reprodutibilidade dos Testes , Doenças dos Suínos/patologia , Dente/patologia
3.
Am J Orthod Dentofacial Orthop ; 156(2): 210-219, 2019 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-31375231

RESUMO

INTRODUCTION: More patients are choosing customized orthodontic appliances because of their excellent esthetics. It is essential that clinicians understand the biomechanics of the tooth movement tendency in customized lingual orthodontics. This study aimed to evaluate the tooth movement tendency during space closure in maxillary anterior teeth with the use of miniscrew anchorage in customized lingual orthodontics with various power arm locations. METHODS: Three-dimensional finite element models of the maxilla were created with miniscrews and power arms; the positions were varied to change the force directions. A retraction force (1.5 N) was applied from the top of the miniscrews to the selected points on the power arm, and the initial displacements of the reference nodes of the maxillary teeth were analyzed. RESULTS: After applying force in different directions, power arms located at the distal side of the canines led to larger initial lingual crown tipping and occlusal crown extrusion of the maxillary incisors compared with power arms located at the midpoint between the lateral incisors and canines, and caused a decreasing trend of the intercanine width. CONCLUSIONS: In customized lingual orthodontic treatment, power arms located at the distal side of the canines are unfavorable for anterior teeth torque control and intercanine width control. Power arms located at the midpoint between the lateral incisors and canines can get better torque control, but still cannot achieve excepted torque without extra torque control methods, no matter whether its force application point is higher than, lower than, or equal to the level of the top of the miniscrews.


Assuntos
Parafusos Ósseos , Análise de Elementos Finitos , Procedimentos de Ancoragem Ortodôntica/instrumentação , Procedimentos de Ancoragem Ortodôntica/métodos , Fechamento de Espaço Ortodôntico , Técnicas de Movimentação Dentária/instrumentação , Técnicas de Movimentação Dentária/métodos , Adulto , Fenômenos Biomecânicos , Simulação por Computador , Dente Canino/patologia , Humanos , Imageamento Tridimensional/métodos , Incisivo/patologia , Maxila , Modelos Biológicos , Desenho de Aparelho Ortodôntico , Aparelhos Ortodônticos , Braquetes Ortodônticos , Fechamento de Espaço Ortodôntico/instrumentação , Fechamento de Espaço Ortodôntico/métodos , Fios Ortodônticos , Planejamento de Assistência ao Paciente , Estresse Mecânico , Coroa do Dente , Torque , Resultado do Tratamento
4.
Am J Phys Anthropol ; 168(3): 582-594, 2019 03.
Artigo em Inglês | MEDLINE | ID: mdl-30663051

RESUMO

OBJECTIVES: This study provides a comprehensive analysis of crypt fenestration enamel defects (CFEDs) from the Eten and Mórrope communities, Colonial period (A.D. 1,530-1,750), Lambayeque Valley, Peru. The goal is to help clarify the role of these lesions as reflections of early life environments as well as relationships growth and survival at future ages. MATERIALS AND METHODS: CFED absence/presence was recorded in the mandibular canines of 105 individuals and 202 teeth. Defect prevalence was compared between the Eten and Mórrope sites using a proportions test. Femoral growth residuals were compared between CFED present and absent samples. Mortality risk was evaluated using Kaplan-Meier survival analysis. RESULTS: CFED frequencies at Eten and Mórrope were similar to previous studies. Greater frequencies of CFEDs were found at Eten compared to Mórrope. There was no association between skeletal growth and CFEDs. No differences in mortality were found between CFED present and absent individuals within each site. General survivorship at Eten was significantly greater than Mórrope. However, individuals without CFEDs at Eten had greater survivorship than those with and without CFEDs at Mórrope. Individuals with CFEDs at Eten had greater survivorship than those with CFEDs at Mórrope. These differences begin around 1.7 years. CONCLUSIONS: CFEDs may be associated with stress experience, but associations with growth and survivorship at later ages is context dependent. CFED prevalence is an ambiguous indicator of stress when used in the absence of mortality data, and even under those circumstances, appears limited by differences in local demography.


Assuntos
Esmalte Dentário , Índios Sul-Americanos/estatística & dados numéricos , Doenças Dentárias , Antropologia Física , Dente Canino/patologia , Esmalte Dentário/crescimento & desenvolvimento , Esmalte Dentário/patologia , Feminino , História do Século XVI , História do Século XVII , História do Século XVIII , Humanos , Masculino , Peru , Doenças Dentárias/história , Doenças Dentárias/mortalidade , Doenças Dentárias/patologia
5.
Eur J Orthod ; 40(6): 575-582, 2018 11 30.
Artigo em Inglês | MEDLINE | ID: mdl-30500916

RESUMO

Objectives: To compare parameters related to impacted canines at the cleft versus the normal contralateral side and with non-impacted canines at the cleft side in unilateral cleft lip and palate (UCLP) patients. We also aim to search for possible associated parameters enabling prediction of canine impaction in these patients. Materials and methods: Ninety-five non-syndromic UCLP patients were included and divided into group A (n = 41 patients) with unilateral impacted canines at the cleft side (A1) and spontaneously erupted canines at the non-cleft side (A2) and group B with spontaneously erupted canines at the cleft side (n = 54 patients). Clinical information and radiographic parameters on panoramic radiographs were collected and compared between groups using a generalized linear mixed model, a Mann-Whitney U-test, a Fisher's exact test, and receiver operating characteristic tests. Results: Impaction of the maxillary canine at the cleft side in UCLP patients can be suspected in case of delayed canine root development, a higher vertical position and sector score (P < 0.05) and higher angles between the canine and the midline, as well as between canine and lateral incisor and between first premolar (P < 0.001). Results clearly indicate that the erupting canine position at the cleft side, even when not impacted, is different from the non-cleft side. Conclusion: There is a great risk for canine impaction at the cleft side in UCLP patients when the canine position is more apical than one-third of the root of the adjacent lateral incisor and when the angles between canine and midline and between canine and first premolar are higher than 23.82 and 16.1 degrees, respectively. These associated parameters should have to be studied in a prospective setting to confirm their predictive value.


Assuntos
Enxerto de Osso Alveolar/métodos , Fenda Labial/complicações , Fissura Palatina/complicações , Dente Impactado/etiologia , Dente Pré-Molar/diagnóstico por imagem , Dente Pré-Molar/patologia , Fenda Labial/patologia , Fenda Labial/cirurgia , Fissura Palatina/patologia , Fissura Palatina/cirurgia , Dente Canino/diagnóstico por imagem , Dente Canino/crescimento & desenvolvimento , Dente Canino/patologia , Feminino , Humanos , Incisivo/diagnóstico por imagem , Incisivo/patologia , Lactente , Masculino , Radiografia Panorâmica , Estudos Retrospectivos , Erupção Dentária , Dente Impactado/diagnóstico por imagem , Dente Impactado/patologia
6.
Gac. méd. boliv ; 41(2): 21-23, Dec. 2018. tab.
Artigo em Espanhol | LILACS | ID: biblio-988173

RESUMO

OBJETIVO: evaluar la presencia de desoclusión en dientes molares durante los movimientos excursivos, después del restablecimiento de la guía anterior dental, para brindar estabilidad oclusal y estética en pacientes mujeres que asisten a la clínica de Rehabilitación Oral y Estética de la Universidad Mayor de San Simón. MÉTODOS: la presente investigación es de tipo descriptivo, transversal. Los sujetos de estudio fueron pacientes mujeres que acuden a la Clínica de Posgrado Rehabilitación Oral y Estética de la Universidad Mayor de San Simón, quienes presentan desgaste dental patológico tipo I en los dientes caninos e incisivos; durante la gestión 2016. RESULTADOS: se demuestra la presencia de 100% de desoclusión, durante los movimientos excéntricos de protrusiva; 80% de desoclusión en movimientos excéntricos de lateralidad derecha, debido a que 20% de los pacientes estudiados, no pueden realizar la desoclusión en lateralidad derecha por falta de alineación tridimensional (curva de Wilson ) en el lado derecho. Y 100% de desoclusión en movimientos excéntricos de lateralidad izquierda; restablecida la guía anterior dental con resinas fotopolimerizables. CONCLUSIONES: la guía anterior dental como un factor de la desoclusión tanto en movimientos protrusivos como movimientos laterales, es un mecanismo importante de protección hacia los dientes posteriores y a la articulación temporomandibular, lo que trasciende en la necesidad imperiosa de la rehabilitación de la misma, en el desgaste dental patológico tipo I donde el desgaste es menos severo y no hay pérdida de dimensión vertical de oclusión, con restauraciones directas, porque existe menos desgaste de estructura dental. Es un tratamiento reversible, estético y genera resultados funcionales adecuados.


OBJETIVE: to evaluate the de-occlusion presence in molar teeth during the excursion movements, after the reinstatement of the anterior dental guide, to give occlusal and aesthetic stability to female patients who attend the clinic of Oral and Aesthetic Rehabilitation Clinic of Universidad Mayor de San Simon. METHODS: the current research is a descriptive and transversal type. The subject of study were female patients, that attend the Postgraduate Clinic Oral and Aesthetic Rehabilitation of San Simon University who have a pathological tooth wear in canino teeth, and incisive teeth during 2016 administration. RESULTS: it is shown the presence of the de- occlusion in 100% during the protrusive eccentric movements, 80% in eccentric movements of rigth laterality because of the non-existent tridimensional alignment (Wilson's curve) in the right side. And 100% in eccentric movements of the left laterality; the anterior dental guide was reinstated with light-curing resins. CONCLUSIONS: the anterior dental guide asa de-occlucsion factor in both movements, protrusive and lateral, is an important protection mechanism for the posterior teeth and for temporomandibular joint. It transcends the urgent need for the rehabilitation of it, in pathological tooth wear type I where the wear is less severe and there is no loss of vertical dimension of occlusion, with direct restorations, because there is less wear of dental structure. It is a reversible and aesthetic treatment and it generates adequate functional results.


Assuntos
Humanos , Feminino , Oclusão Dentária , Dente Canino/patologia , Desgaste dos Dentes/diagnóstico
7.
Am J Orthod Dentofacial Orthop ; 154(5): 657-663, 2018 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-30384936

RESUMO

INTRODUCTION: The aims of this study were to investigate the eruption pattern of maxillary permanent canines in the alveolar cleft area after secondary alveolar bone grafting and to assess the risk indicators for canine impaction. METHODS: The sample consisted of 75 patients with unilateral cleft lip and palate who underwent secondary alveolar bone grafting with rhBMP-2 with a mean age of 9.8 years of age at 1 center. A split-mouth study design was used, with the noncleft hemiarch comprising the control group. Panoramic radiographs taken before, immediately after, and 1 year after secondary alveolar bone grafting were used to assess the following parameters in both cleft side (CS) and noncleft side: canine mesiodistal angulation, canine height relative to the occlusal plane, canine mesial displacement, and superimposition with the neighboring maxillary incisors. The frequency of associated dental anomalies was compared between patients with and without CS canine impaction. Data were evaluated using analysis of variance, t tests, Fisher tests, and multiple logistic regression analysis (P <0.05). RESULTS: On the CS, maxillary canines were usually more mesially angulated and more distant from the occlusal plane compared with the noncleft side. The prevalences of canine impaction on the CS and noncleft side were 24% and 1.3%, respectively. Maxillary impacted canines on the CS demonstrated increased mesiodistal angulation and height at all time points. No association between CS canine impaction and mesial displacement (sectors) was found. An increased prevalence of lateral incisor agenesis on the CS was observed in the subgroup with canine impaction. CONCLUSIONS: Increased mesial angulation and lateral incisor agenesis on the CS are early risk indicators for maxillary canine impaction in patients with unilateral cleft lip and palate.


Assuntos
Enxerto de Osso Alveolar/efeitos adversos , Fenda Labial/cirurgia , Fissura Palatina/cirurgia , Dente Canino/fisiologia , Complicações Pós-Operatórias , Erupção Dentária , Dente Impactado/etiologia , Enxerto de Osso Alveolar/métodos , Anodontia/patologia , Proteína Morfogenética Óssea 2/administração & dosagem , Criança , Dente Canino/diagnóstico por imagem , Dente Canino/patologia , Feminino , Humanos , Incisivo/patologia , Masculino , Radiografia Panorâmica , Proteínas Recombinantes/administração & dosagem , Estudos Retrospectivos , Fatores de Risco , Dente Impactado/diagnóstico por imagem , Fator de Crescimento Transformador beta/administração & dosagem
8.
J Med Case Rep ; 12(1): 305, 2018 Oct 10.
Artigo em Inglês | MEDLINE | ID: mdl-30301465

RESUMO

BACKGROUND: Dentigerous cysts are common odontogenic cysts associated with unerupted teeth. We describe a previously unreported case of a multidisciplinary approach using surgical, orthodontic, and implant treatment to establish the occlusion for a patient with a maxillary dentigerous cyst. CASE PRESENTATION: An 18-year-old Japanese woman visited our hospital with a chief complaint of gingival swelling in her anterior maxillary region, midline diastema, and tooth crowding. Her main symptom was this gingival swelling. A panoramic radiograph revealed a radiolucent area, 30 mm in diameter, round in shape, and with well-demarcated margins including the maxillary canine. Computed tomography revealed a cystic cavity filled with homogeneous fluid of the same density as water, and a distolingually inclined canine. Our clinical diagnosis was maxillary dentigerous cyst with an unerupted distolingually inclined canine. The selected treatment was marsupialization of the dentigerous cyst, followed by orthodontic traction of the unerupted canine, and simultaneous orthodontic treatment of the midline diastema and tooth crowding. The orthodontic traction failed because the canine did not erupt completely, and the canine was extracted. The treatment plan was then changed to implant treatment after the tooth crowding and midline diastema had been improved. Because the alveolar ridge width was inadequate, the implant was placed after a two-stage implant treatment; therefore, a satisfactory occlusion could be achieved. Our patient did not experience any complications, and the cyst has not recurred. A radiograph taken 7 years after marsupialization of the dentigerous cyst revealed that the cystic cavity had been replaced by new bone. CONCLUSIONS: In general, orthodontic traction of an unerupted tooth after marsupialization should be the best option. However, if orthodontic traction fails, a multidisciplinary approach involving implant treatment may be necessary. We describe a case in which a multidisciplinary approach involving surgical, orthodontic, and implant treatment was used to establish a satisfactory occlusion for a patient with a dentigerous cyst.


Assuntos
Dente Canino , Implantação Dentária/métodos , Cisto Dentígero , Maxila , Ortodontia/métodos , Adolescente , Dente Canino/diagnóstico por imagem , Dente Canino/patologia , Cisto Dentígero/diagnóstico por imagem , Cisto Dentígero/patologia , Cisto Dentígero/cirurgia , Feminino , Humanos , Má Oclusão/diagnóstico por imagem , Maxila/diagnóstico por imagem , Maxila/cirurgia , Radiografia Panorâmica/métodos , Tomografia Computadorizada por Raios X/métodos , Dente não Erupcionado/diagnóstico por imagem , Dente não Erupcionado/terapia , Resultado do Tratamento
9.
Am J Orthod Dentofacial Orthop ; 154(4): 524-534, 2018 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-30268263

RESUMO

INTRODUCTION: The purpose of this study was to evaluate the short-term impact of rapid maxillary expansion (RME) on the eruption paths of ectopically and normally erupting maxillary canines in the mixed dentition. METHODS: Thirty-two patients with 49 ectopically erupting canines (EEC group; age, 9.53 ± 1.10 years) and 18 patients with 27 normally erupting canines (NEC group; age, 9.25 ± 1.06 years) underwent RME. Thirty-six subjects with 54 normally erupting canines composed the untreated control group (UC group; age, 9.03 ± 0.72 years). Horizontal, vertical, and angular positions of canines and adjacent teeth were evaluated in the expanded (EEC and NEC groups) and unexpanded (UC group) patients using panoramic radiographs taken at 2 times with a 1-year interval. The radiographic evaluation methods included score ranking and proportional measurements to minimize panoramic radiograph limitations. Statistical comparisons were performed among the groups (P <0.05). RESULTS: Before expansion, the EEC group's canines were significantly closer to the midline, more distant from the occlusal plane, and more mesially angulated than those in the UC group. After expansion, the canine positions in the EEC and UC groups were similar, whereas the NEC group had a more favorable canine position for eruption. The EEC and NEC groups showed similar canine positional changes, whereas the UC group had the smallest changes. The positions of teeth adjacent to the canine were also significantly affected by RME, and these changes may be associated with improvement of the ectopic canine position. CONCLUSIONS: The changes produced by RME reduced the percentage of ectopic eruption paths and maintained the nonectopic eruption percentage.


Assuntos
Dente Canino/anatomia & histologia , Dente Canino/patologia , Técnica de Expansão Palatina/efeitos adversos , Reabsorção da Raiz/etiologia , Erupção Ectópica de Dente/etiologia , Erupção Dentária , Brasil , Criança , Dente Canino/efeitos dos fármacos , Arco Dental/diagnóstico por imagem , Dentição Mista , Feminino , Humanos , Incisivo/anatomia & histologia , Incisivo/diagnóstico por imagem , Masculino , Maxila/diagnóstico por imagem , Maxila/patologia , Radiografia Panorâmica , Reabsorção da Raiz/diagnóstico por imagem , Ápice Dentário/anatomia & histologia , Ápice Dentário/patologia , Erupção Ectópica de Dente/diagnóstico por imagem , Técnicas de Movimentação Dentária/efeitos adversos , Raiz Dentária/anatomia & histologia , Raiz Dentária/diagnóstico por imagem , Dente Decíduo
10.
Eur J Oral Sci ; 126(6): 439-448, 2018 12.
Artigo em Inglês | MEDLINE | ID: mdl-30216610

RESUMO

We sought to investigate site-specific expression of bone-regulatory factors expressed by human dental follicles and to compare the stimulated expression of tumour necrosis factor (ligand) superfamily, member 11/tumour necrosis factor receptor superfamily, member 11b (RANKL/OPG) in human dental follicle cells (HDFCs) from different patients. Analysis of bone-regulatory markers in follicles from 12 different study participants was performed using RT-qPCR and immunofluorescence; apical and coronal segments from each dental follicle were processed independently. Four additional dental follicles were used for cell cultures; HDFCs were precultured in osteogenic medium to initiate differentiation and thereafter cultured with 10-6 M forskolin (FSK) to activate the protein kinase cAMP (PKA/cAMP) signalling pathway and induce RANKL/OPG expression. We demonstrate that RANKL expression is significantly higher in the coronal part of follicles than in the apical part. High levels of collagen type 1 (COL1), alkaline phosphatase (ALP) and Gap-junction protein, alpha 1, 43 kDa (CX43) were expressed, whereas expression of Sp7 transcription factor (OSX), bone morphogenetic protein 2 (BMP2), colony-stimulating factor 1 (CSF-1), chemokine (C-C motif) ligand 2 (MCP1), and OPG was low in all samples. The immunofluorescence localization of CSF-1, MCP1, osteocalcin (OCN), RANKL, and BMP2 was not specific for either part of the follicles. In conclusion, a consistently high expression of CX43 suggests that gap-junction communication in HDFCs is essential for the eruption process. Furthermore, the induced expression of RANKL in HDFCs varies significantly between individuals and may relate to clinical variations in tooth eruption.


Assuntos
Reabsorção Óssea/metabolismo , Saco Dentário/metabolismo , Osteogênese/fisiologia , Adolescente , Fosfatase Alcalina/metabolismo , Proteína Morfogenética Óssea 2/metabolismo , Reabsorção Óssea/diagnóstico por imagem , Reabsorção Óssea/genética , Reabsorção Óssea/patologia , Diferenciação Celular , Quimiocina CCL2/metabolismo , Quimiocinas/metabolismo , Criança , Colforsina/farmacologia , Colágeno Tipo I/metabolismo , Conexina 43/metabolismo , Dente Canino/diagnóstico por imagem , Dente Canino/patologia , Saco Dentário/diagnóstico por imagem , Saco Dentário/patologia , Feminino , Expressão Gênica , Humanos , Fator Estimulador de Colônias de Macrófagos/metabolismo , Masculino , Osteoblastos , Osteoclastos , Osteogênese/genética , Ligante RANK/metabolismo , Receptor Ativador de Fator Nuclear kappa-B/metabolismo , Receptores do Fator de Necrose Tumoral/metabolismo , Transdução de Sinais , Fator de Transcrição Sp7/metabolismo
11.
Angle Orthod ; 88(6): 719-725, 2018 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-30102087

RESUMO

OBJECTIVES:: To evaluate association and causation between maxillary lateral incisors' (MxI2) apical root volume (ARV) and palatally displaced canines (PDC). MATERIALS AND METHODS:: In a retrospective cross-sectional study, computed tomography scans of 179 patients with unilateral PDC were analyzed. MxI2 root length and volume on the impaction and eruption side were measured. A mixed logit model was used to infer the association between ARV and PDC and an instrumental variables approach to interpret causality. RESULTS:: MxI2 root length on the impaction side was shorter in 42%, equal in 33% and longer in 25% of the patients. ARV amounted for 13.5% of total root volume on the impaction and 14.9% on the eruption side. Reduced ARV was significantly associated with the impaction side ( P < .001). The causal effect of ARV on PDC in the instrumental variable approach amounted to less than half of the association in a standard noncausal approach. CONCLUSIONS:: An association between PDC and reduced MxI2 root length and volume was confirmed. However, the lack of causality did not allow the researchers to draw a conclusion as to whether a reduced ARV is causing PDC or resulting from it; this should be considered in etiologic theories.


Assuntos
Dente Canino/patologia , Incisivo/patologia , Dente Impactado/etiologia , Adolescente , Adulto , Estudos Transversais , Dente Canino/diagnóstico por imagem , Feminino , Humanos , Incisivo/diagnóstico por imagem , Masculino , Maxila , Radiografia Dentária , Estudos Retrospectivos , Tomografia Computadorizada por Raios X , Dente Impactado/diagnóstico por imagem , Adulto Jovem
12.
Angle Orthod ; 88(6): 726-732, 2018 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-30102088

RESUMO

OBJECTIVES:: To assess palatal vault height, tooth size, and dental arch dimensions in patients with unilateral and bilateral palatally displaced canines compared with a control group. MATERIALS AND METHODS:: A sample of 66 patients (mean age: 11.5 ± 1.0 years) with 22 unilateral palatally displaced canines (UPDCs), 22 bilateral palatally displaced canines (BPDCs), and 22 controls (C) were consecutively recruited. All three groups had dental casts that were scanned digitally using the OrthoX three-dimensional model scanner. Tooth size, palatal vault height, dental arch width, dental arch depth, dental arch length, and dental arch space were measured by the same examiner using the GOM software. Remeasurements were made in 10 randomly identified patients. RESULTS:: The palatal vault height was significantly lower in the BPDC group compared with controls. A significantly smaller mesial-distal crown width and, in general, more spacing in the maxilla were found in the UPDC and BPDC groups. No differences in arch length or arch width at the molar region were seen between the groups, while the arch length at the canine region was smaller in the UPDC and BPDC groups. However, this was observed in BPDC patients with both deciduous canines present and in most UPDC patients where the deciduous canine was present, compared with the control group, who had more permanent canines present. CONCLUSIONS:: Patients with PDC had greater reduction in tooth size compared with the control group. The arch length and arch width were similar in patients with and without PDC.


Assuntos
Dente Canino/patologia , Palato/patologia , Erupção Ectópica de Dente/patologia , Adolescente , Estudos de Casos e Controles , Criança , Técnica de Fundição Odontológica , Feminino , Humanos , Masculino , Estudos Prospectivos
13.
Prog Orthod ; 19(1): 20, 2018 Jul 16.
Artigo em Inglês | MEDLINE | ID: mdl-30009340

RESUMO

BACKGROUND: The aetiology of the canine displacement still remains controversial. Some authors implicated a deficiency in maxillary width as a local mechanical cause for impacted canines. The aim of the study was to examine whether there is a relationship between impacted maxillary canines, early diagnosed by using panoramic radiographs, and the morphology of the maxilla on 3D model casts. METHODS: The displaced maxillary canines (DMC) group consisted of 24 patients (mean age, 9.1 ± 1.1 years), while the control group consisted of 25 subjects (mean age, 8.7 ± 0.9 years). Seven measurements were calculated on the digital casts of each subject: intermolar width (IMW), arch length (AL), depth of the palatal vault (PVD), available arch space (AAS), the sum of the anterior segments (SAS), the right/affected (R-Af) and left/unaffected (L-Un) available spaces. RESULTS: Both IMW and AL in the DMC group were significantly decreased relative to the control group (P < 0.01), indicating that patients with displaced canines presented a shorter and narrower palate than subjects without eruption problems. Moreover, the values of the SAS and AAS were significantly decreased (P < 0.01) in the DMC group relative to the controls. CONCLUSIONS: The shape of the maxillary arch was narrower and shorter in the displaced maxillary canines group compared with the control group.


Assuntos
Dente Canino/patologia , Maxila/patologia , Dente Impactado/diagnóstico , Estudos de Casos e Controles , Criança , Dente Canino/diagnóstico por imagem , Arco Dental/diagnóstico por imagem , Arco Dental/patologia , Técnica de Fundição Odontológica , Modelos Dentários , Diagnóstico Precoce , Feminino , Humanos , Masculino , Maxila/diagnóstico por imagem , Radiografia Panorâmica , Dente Impactado/diagnóstico por imagem , Dente Impactado/patologia
14.
Georgian Med News ; (278): 55-62, 2018 May.
Artigo em Inglês | MEDLINE | ID: mdl-29905546

RESUMO

Transposition of teeth - mutual exchange of the teeth position in the dental arch, it's a rare anomaly of the dentoalveolar apparatus. Most often in the transposition process the upper canines are involved in combination with the first premolars. Anomaly is mainly caused by an incorrect location of the teeth germs. Full correction is optimal in the treatment of transposition in terms of function and aesthetics, but in most cases, the movement of these teeth in their physiological position is impossible. Aim - to define and argue the tactics of the orthodontist in the treatment of patients with teeth transposition. The algorithm for curation of patients with teeth transposition consisted of several blocks: the establishment of etiologic factors, clinical and additional examination methods, planning and making treatment tactics, the stages of active treatment and management of the patient in the retention period. Among additional methods of examination were used: orthopantomography, 3D computer tomography, photometry, anthropometry. For a visual demonstration of orthodontic treatment, an curation algorithm of two patients with a teeth transposition was described. The choice of treatment options depended on the location and type of transposition (full or partial), the age of the patient, the condition of the periodontal tissue, the size of the teeth and their roots, the degree of tooth dislocation and root inclination, the type of occlusion, the bone thickness in the region of alveolar process, the level of cooperation between the patient and the doctor. Knowledge of the treatment tactics of patients with teeth transposition allows the orthodontist to normalize the individual teeth position, restore function and aesthetics in an optimal time. After our patient's treatment, positive esthetic, morphological and functional results were achieved.


Assuntos
Algoritmos , Dente Pré-Molar/cirurgia , Dente Canino/cirurgia , Má Oclusão/cirurgia , Mandíbula/cirurgia , Maxila/cirurgia , Adolescente , Antropometria , Dente Pré-Molar/diagnóstico por imagem , Dente Pré-Molar/patologia , Criança , Dente Canino/diagnóstico por imagem , Dente Canino/patologia , Oclusão Dentária , Humanos , Masculino , Má Oclusão/diagnóstico por imagem , Má Oclusão/patologia , Mandíbula/diagnóstico por imagem , Mandíbula/patologia , Maxila/diagnóstico por imagem , Maxila/patologia , Tomografia Computadorizada Multidetectores , Braquetes Ortodônticos , Radiografia Panorâmica
15.
J Coll Physicians Surg Pak ; 28(6): S133-S134, 2018 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-29866248

RESUMO

Excluding all third molars, the most common impaction is of maxillary canine. Palatal impaction (80%) is much more common than labial impaction (20%). Impaction of maxillary central incisor does not occur frequently. We report an 11-year girl with clinical and radiological features of impacted maxillary canine and maxillary left central incisor. At the age of five years, she had a fell victim to history of trauma of maxillary central incisor with premature exfoliation. Radiograph showed labial impaction of right canine and left central incisor in maxilla.


Assuntos
Dente Canino/diagnóstico por imagem , Incisivo/diagnóstico por imagem , Procedimentos Cirúrgicos Bucais/métodos , Dente Impactado/etiologia , Criança , Dente Canino/patologia , Humanos , Incisivo/patologia , Extrusão Ortodôntica , Técnica de Expansão Palatina , Radiografia Panorâmica , Traumatismos Dentários/complicações , Dente Impactado/diagnóstico por imagem , Dente Impactado/cirurgia , Resultado do Tratamento
16.
Eur J Orthod ; 40(6): 592-596, 2018 11 30.
Artigo em Inglês | MEDLINE | ID: mdl-29726936

RESUMO

Objectives: To evaluate the association between maxillary dental arch transverse dimensions, palatal depths, palatal area and volume with buccally displaced canine (BDC) in mixed dentition subjects when compared to non-BDC subjects using laser scanner 3D technology. Materials and methods: Sixty Caucasian subjects, 8-11 years of age (mean, 9.26 ± 1.48 years), were included. In each group (BDC and non-BDC) 30 children were matched. Digital dental casts were obtained using a 3 Shape D700 laser scanner. Intercanine and intermolar widths (cusp and gingival levels), anterior and posterior palatal depth (cusp level), palatal surface area and volume were measured. An independent sample Student's t-test and an ANOVA were undertaken with significance level set as P < 0.05. Results: Intercanine widths at the cusp (1.76 mm; P = 0.020) and the gingival level (1.6 mm; P = 0.006), palatal area (133 mm2; P = 0.021) and volume (790 mm3; P = 0.046) were significantly lower in the BDC compared to the control group. Limitations: A smaller part of the subjects was in late mixed dentition phase. To overcome this limitation a matched control group was used. Some subjects did not have some teeth because of the transition phase which might have had an influence on the dental measurements. However, these subjects were not excluded to avoid introducing a bias. Conclusions: 3D evaluation of the maxillary arch and palate highlighted significant differences between BDC and non-BDC mixed dentition subjects. Maxillary dental arch dimensions and palate morphology may allow early identification and prevention of maxillary canine impaction.


Assuntos
Dente Canino/patologia , Arco Dental/patologia , Palato/patologia , Dente Impactado/patologia , Estudos de Casos e Controles , Moldes Cirúrgicos , Criança , Dente Canino/diagnóstico por imagem , Arco Dental/diagnóstico por imagem , Dentição Mista , Feminino , Humanos , Imageamento Tridimensional , Masculino , Maxila/diagnóstico por imagem , Maxila/patologia , Odontometria/métodos , Palato/diagnóstico por imagem , Dente Impactado/diagnóstico por imagem
17.
Eur J Orthod ; 40(6): 583-591, 2018 11 30.
Artigo em Inglês | MEDLINE | ID: mdl-29617758

RESUMO

Objective: To test whether early headgear (HG) treatment and space conditions in the dental arch affect the eruption pathway of the maxillary canines in young children with mixed dentition. Subjects and methods: Data from two randomized controlled trials studying the effects of early HG treatment were pooled, yielding a study sample comprising 99 children (38 girls and 61 boys, mean age 7.6 years) with Angle Class II occlusion. Fifty-one children were treated with HG and 48 children served as an untreated control group (CG). Digital 3D models and panoramic radiographs were taken before (T0) and after (T1) treatment, and changes in the maxillary canine eruption angle and interdental spaces were measured at T0 and T1. A paired samples t-test was used to assess changes in maxillary canine angulation, and an independent samples t-test was used to evaluate the effect of HG treatment on spacing in the dental arch. Associations between intra-arch space conditions and changes in maxillary canine angulation were estimated with linear regression models. Results: The eruption pattern of the permanent canine was significantly more vertical in the HG group than in the CG. The linear regression models showed a statistically significant association among the intercanine distance, crowding in the anterior part of the maxilla, and changes in the maxillary canine eruption angle. The maxillary canine eruption pattern changed significantly more to a vertical direction in spaced dental arches than in crowded dental arches in the HG group. Conclusion: This study shows that early HG treatment in children with Angle Class II occlusion may change the eruption pattern of permanent maxillary canines to a more vertical direction. This change appears to be related to space conditions in the maxillary arch, especially in the intercanine region, with more effect in children with spaced dental arches than in children with crowded dental arches.


Assuntos
Dente Canino/crescimento & desenvolvimento , Aparelhos de Tração Extrabucal , Má Oclusão de Angle Classe II/terapia , Erupção Dentária , Criança , Dente Canino/diagnóstico por imagem , Dente Canino/patologia , Arco Dental/diagnóstico por imagem , Arco Dental/patologia , Dentição Mista , Feminino , Humanos , Masculino , Má Oclusão de Angle Classe II/diagnóstico por imagem , Má Oclusão de Angle Classe II/patologia , Maxila/diagnóstico por imagem , Maxila/patologia , Radiografia Panorâmica , Ensaios Clínicos Controlados Aleatórios como Assunto
18.
Indian J Dent Res ; 29(2): 206-211, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-29652016

RESUMO

Introduction: The circumferential 2 mm ferrule during the fabrication of the crown is strongly advocated for the long-term clinical success. During the routine clinical practice, the dentist encounters the endodontically treated tooth (ETT) with inadequacy of the ferrule in some segment due to caries, abrasion, and erosions. The aim of this in vitro study was to investigate the consequence of inadequate segmental ferrule location on fracture strength of the root canal-treated anterior and posterior teeth. Materials and Methods: Fifty each maxillary canine and mandibular premolar intact human teeth were root canal treated and sectioned at 2 mm above the cementum-enamel junction. The teeth samples were divided into 5 groups of 10 each. The G-I and G-V samples had the 360° ferrule and complete absence of the ferrule, respectively. The G-II had the inadequate ferrule on the palatal surface, while G-III and G-IV had inadequate ferrule at buccal and proximal area. Teeth samples were subsequently restored with glass-reinforced fiber post, composite core, and full veneer metal crown. The samples were tested with universal testing machine under static load to record the fracture resistance. The acquired data were subjected to ANOVA and Tukey's post hoc statistical analysis. Results: The G-I with circumferential ferrule showed the higher fracture resistance. The teeth samples with lack of the ferrule had the least fracture resistance. Among the segmental absence of ferrule, teeth samples with lack of the proximal ferrule were least affected. Deficiency of a ferrule on the lingual wall significantly affected the fracture strength in both anterior and posterior ETT. Conclusions: The ETT with sectional inadequacy of the ferrule is significantly more effective in resisting the fracture in comparison to the complete absence of the ferrule.


Assuntos
Fraturas dos Dentes/patologia , Dente não Vital/patologia , Dente Canino/patologia , Análise do Estresse Dentário , Humanos , Fraturas dos Dentes/prevenção & controle
19.
Niger J Clin Pract ; 21(3): 301-305, 2018 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-29519977

RESUMO

Objective: The aim of the present study was to evaluate the changes of incisor root resorption associated with impacted maxillary canines and health of periodontal tissues around maxillary canines erupted with orthodontic treatment. Materials and Methods: Twenty patients with a unilateral palatally impacted maxillary canine were included in the study. Cone-beam computed tomography images taken before and after orthodontic treatment were compared with the contralateral canines serving as control teeth. Results: Root resorption was present in 10% of central and 40% of lateral incisors before treatment. After treatment, the incidence of resorption decreased. The thickness of the buccal bone surrounding the impacted canines was similar to that surrounding the contralateral canines, except in the apical area. Periodontal pocket depth and alveolar bone loss were greater for the impacted canine teeth than for the contralateral canines. Conclusions: Incisor root resorption associated with impacted canine teeth showed signs of repair after orthodontic treatment. Slight differences related to periodontal health were found between the previously impacted teeth and contralateral canine teeth.


Assuntos
Tomografia Computadorizada de Feixe Cônico/métodos , Dente Canino/patologia , Maxila , Reabsorção da Raiz/etiologia , Dente Impactado/complicações , Dente Impactado/diagnóstico por imagem , Adolescente , Adulto , Criança , Dente Canino/diagnóstico por imagem , Feminino , Humanos , Processamento de Imagem Assistida por Computador , Incisivo/diagnóstico por imagem , Incisivo/patologia , Masculino , Odontometria/métodos , Reabsorção da Raiz/diagnóstico por imagem , Erupção Dentária , Raiz Dentária/diagnóstico por imagem , Resultado do Tratamento
20.
Prog Orthod ; 18(1): 37, 2017 Nov 20.
Artigo em Inglês | MEDLINE | ID: mdl-29152679

RESUMO

BACKGROUND: Root resorptions are assessed and diagnosed using different radiographical techniques. A comparison of the ability to assess resorptions on two-dimensional (2D) and three-dimensional (3D) radiographs is, hitherto, lacking. The aims of this study were to evaluate the accuracy of 2D (periapical radiographs, PA and panoramic radiograph, PAN) and 3D (cone beam computed tomography, CBCT) radiographic techniques in measuring slanted root resorptions compared to the true resorptions, a histological gold standard, in addition to a comparison of all the radiographic techniques to each other. METHODS: Radiographs (CBCT, PA, and PAN), in addition to histological sections, of extracted deciduous canines from thirty-four patients were analyzed. Linear measurements of the most and least resorbed side of the root, i.e., "slanted" resorptions, were measured using an analyzing software (Facad ®). For classification of slanted root resorptions, a modified Malmgren index was used. RESULTS: PAN underestimated the root length on both the least and most resorbed side. Small resorptions, i.e., low modified Malmgren scores, were more difficult to record and were only assessed accurately using CBCT. The root resorption scores were underestimated using PA and PAN. In assessment of linear measures, PAN differed significantly from both CBCT and PA. CONCLUSIONS: CBCT is the most accurate technique when measuring and scoring slanted root resorptions.


Assuntos
Tomografia Computadorizada de Feixe Cônico , Imageamento Tridimensional , Radiografia Dentária , Radiografia Panorâmica , Reabsorção da Raiz/diagnóstico por imagem , Criança , Dente Canino/diagnóstico por imagem , Dente Canino/patologia , Feminino , Humanos , Masculino , Reabsorção da Raiz/classificação , Reabsorção da Raiz/patologia
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