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1.
J Forensic Odontostomatol ; 1(38): 18-25, 2020 May 15.
Artigo em Inglês | MEDLINE | ID: mdl-32420909

RESUMO

Non-metric Dental Crown Traits are a principal source of information in forensic dentistry. However, inadequate data on the prevalence of these traits prompted this study to determine the frequency, sexual dimorphism and degree of inter-trait association in two different populations of India. Dichotomized data on the existence of non-metric features were recorded among individuals from Odisha (n=506) and Kerala (n=536) between 15 to 30 years of age. Cusp of Carabelli is the most common trait to occur (48 %) followed by shovelling of incisors (15%) and Bushman canine (14%). Bushman canine (p=0.045) and Cusp of Carabelli (p = 0.041) were found to be significantly expressed in Odisha and Kerala populations respectively. A strong association between shovelling of central incisor and Bushman canine with a likelihood ratio of 14.041 (p=0.001) was observed. This study will help in characterizing the Indian dentition and post-mortem dental profiling.


Assuntos
Dentição Permanente , Coroa do Dente , Adolescente , Adulto , Coroas , Humanos , Índia , Dente Molar , Adulto Jovem
2.
Compend Contin Educ Dent ; 41(5): 264-270; quiz 271, 2020 May.
Artigo em Inglês | MEDLINE | ID: mdl-32369383

RESUMO

The sequelae associated with anterior oral trauma during childhood growth may require a protracted period of clinical management to achieve an optimal foundation for future prosthetic therapy. This article presents two case examples of long-term ridge development and preservation in children after anterior dental and alveolar trauma. These two patients were managed for periods of 11 years, one from age 8 to 19 and the other from age 9 to 20, until they were old enough to receive implantsupported restorations. Two different treatment plans were prescribed based on whether or not the teeth in question were ankylosed. In one case, fractured roots that were not ankylosed were retained; in the other, decoronation of an ankylosed tooth was performed.


Assuntos
Anquilose Dental , Avulsão Dentária , Traumatismos Dentários , Processo Alveolar , Criança , Humanos , Coroa do Dente
3.
Zhonghua Kou Qiang Yi Xue Za Zhi ; 55(4): 280-284, 2020 Apr 09.
Artigo em Chinês | MEDLINE | ID: mdl-32268631

RESUMO

With the wide application of digital technology in the field of stomatology, the acquisition of three-dimensional tooth and dentition information through three-dimensional (3D) image data and optical scan data has become an indispensable process in clinical diagnosis and analysis. Cone-beam CT images and optical scanning images have their own characteristics in terms of data acquisition range and the accuracy of data. Single data source is not accurate enough or complete in the delivery of tooth and dental information. At present, two data sources are used to construct a 3D crown root model with high-precision crown and complete root information to meet the requirement of clinical orthodontic functional setup and implant surgical guide design. The integration of tooth crown and root is one of the focused topics of clinical research. This review will summarize the research progress of 3D crown root model construction method, introduce the application of various algorithms, and analyze the characteristics of these approaches, in order to provide reference for clinical application and scientific research.


Assuntos
Imageamento Tridimensional , Coroa do Dente , Dente , Tomografia Computadorizada de Feixe Cônico , Humanos , Coroa do Dente/diagnóstico por imagem , Raiz Dentária
4.
Prim Dent J ; 8(4): 48-53, 2020 Jan 29.
Artigo em Inglês | MEDLINE | ID: mdl-32127094

RESUMO

The term 'crown lengthening surgery' refers to a variety of techniques which aim to expose a greater amount of tooth structure around a tooth or group of teeth. The decision to treat and which technique to use will depend upon: the underlying aetiology; a thorough history and examination; results of any supporting investigations and a clear understanding of the intended outcome of treatment. This paper aims to provide an overview of crown lengthening surgery and is illustrated with clinical cases.


Assuntos
Aumento da Coroa Clínica , Coroa do Dente , Coroas , Humanos
5.
Am J Orthod Dentofacial Orthop ; 157(3): 329-339, 2020 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-32115111

RESUMO

INTRODUCTION: The purpose of this study was to comparatively evaluate the effects of Twin-block (TB) appliance and sagittal-guidance Twin-block (SGTB) appliance on alveolar bone around mandibular incisors in growing patients with Class II Division 1 malocclusion, using cone-beam computed tomography. METHODS: The sample consisted of 25 growing patients with Class II Division 1 malocclusion (14 boys and 11 girls, mean age 11.92 ± 1.62 years) and was randomly distributed into the TB group (n = 13) and the SGTB group (n = 12). The treatment duration was 11.56 ± 1.73 months. Pretreatment (T1) and posttreatment (T2) cone-beam computed tomography scans were taken in both groups. Height, thickness at apex level, and volume of the alveolar bone around mandibular left central incisors were measured respectively on labial and lingual side, using Mimics software (version 19.0; Materialise, Leuven, Belgium). Based on the stable structures, 3-dimensional (3D) registrations of T1 and T2 models were taken to measure the sagittal displacement of incisors. Intragroup comparisons were evaluated by paired-samples t tests and Wilcoxon tests. Independent-samples t tests and Mann-Whitney U tests were used for intergroup comparisons. RESULTS: In both groups, alveolar bone height and volume on the labial side of the incisors significantly decreased after treatment (P <0.05). Lingual alveolar bone height, lingual and total alveolar bone volume, labial, lingual and total alveolar bone thickness showed no significant difference between T1 and T2 (P >0.05). In both groups the incisors tipped labially and drifted to the labial side. Compared with the TB group, less labial alveolar bone loss, less incisor proclination and crown edge drift were found in the SGTB group (P <0.05). CONCLUSIONS: Labial alveolar bone loss around mandibular incisors was observed after both types of appliances treatment in growing patients with Class II Division 1 malocclusion. Less labial alveolar bone loss, less incisor proclination, and crown edge drift were found in the SGTB group than in the TB group during treatment.


Assuntos
Perda do Osso Alveolar , Má Oclusão de Angle Classe II , Aparelhos Ortodônticos , Adolescente , Cefalometria , Criança , Tomografia Computadorizada de Feixe Cônico , Feminino , Humanos , Incisivo , Masculino , Má Oclusão de Angle Classe II/diagnóstico por imagem , Má Oclusão de Angle Classe II/terapia , Mandíbula , Coroa do Dente
6.
J Am Dent Assoc ; 151(5): 358-367, 2020 05.
Artigo em Inglês | MEDLINE | ID: mdl-32209245

RESUMO

BACKGROUND: Teeth with dens evaginatus (DE) are more commonly observed in Western countries than previously. This is due to the increase in populations of patients of Asian origin, in whom DE is more common than in people of European origin. The interest in DE has also increased with the introduction of a procedure called regenerative endodontics. CASE DESCRIPTION: A narrative review of treatment options for teeth with DE is presented, based on pulpal conditions and maturity of the teeth. PRACTICAL IMPLICATIONS: Early recognition of teeth with DE allows for treatment choices that generally lead to good outcomes and can aid in preserving developing teeth in young patients.


Assuntos
Doenças da Polpa Dentária , Anormalidades Dentárias , Dente Pré-Molar , Humanos , Incisivo , Coroa do Dente
7.
Am J Orthod Dentofacial Orthop ; 157(2): 218-227, 2020 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-32005474

RESUMO

INTRODUCTION: The aim of this study was to investigate the vestibular anatomy of teeth in samples of adult Italian and Mozambican subjects in ideal occlusion and permanent dentition and identify any anatomic characteristics that may influence bonding in the straight-wire technique. METHODS: Linear measurements and coordinates of each curve representing the clinical crown height and width of each tooth were acquired from digital models of each subject categorized to 1 of 2 groups: Italian (18 males, 22 females; mean age, 29.6 ± 5.7 years) or Mozambican (14 males, 15 females; mean age, 23.4 ± 5.9 years). All subjects had normal dentition and no previous orthodontic treatment, fillings, or prostheses. Method error and systematic error were calculated according to the Dahlberg formula (S2 = ∑ d2/2n) and dependent Student t test (P <0.05), respectively. Tooth symmetry was investigated through a paired-samples t test (P <0.05) and sex difference via an independent-samples t test (P <0.05). After neither asymmetry nor sexual dimorphism was found, all data were pooled, inverting the signs of the X coordinates and then mirroring data. Subsequently, a 2-samples t test (P <0.05) and a multivariate cluster analysis were performed on the mirrored data to compare the 2 groups and to identify any within-group diversity for number of clusters for each tooth. Means of all linear measurements and coordinates (crown height and width) calculated for each cluster were reported and compared using a standard 2-samples t test (P <0.05). RESULTS: Two clusters were identified for the maxillary second premolars and molars in Italian subjects, whereas in the Mozambican subjects, there were 2 clusters for the maxillary first premolars and lateral incisors and 3 clusters for the maxillary canines and central incisors. The mandibular arch was remarkably homogeneous, with only 1 cluster per tooth in each group. In the mandibular arch, statistical differences were recorded between ethnic groups in crown height at the central incisors and second molars and in crown width in the sector from the second premolar to the second molar. CONCLUSIONS: There were considerable differences both between and within racial groups in crown height, crown width, and numbers of clusters, which should be taken into account during bonding. Although single-bracket placement guides specific for ethnicity may be feasible for the mandibular arch, the significant diversity in number of clusters in the maxillary arch indicates that more accurate bracket placement guides that take into account such heterogeneity are required.


Assuntos
Odontometria , Dente , Adolescente , Adulto , Dente Pré-Molar , Dente Canino , Feminino , Humanos , Itália , Masculino , Dente/anatomia & histologia , Coroa do Dente , Adulto Jovem
8.
Artigo em Inglês | MEDLINE | ID: mdl-32032405

RESUMO

This case report aimed to describe a soft tissue approach to restore a buccal soft tissue dehiscence (BSTD) combined with the loss of peri-implant papillae and loss of periodontal attachment on the adjacent teeth. The first step of the proposed approach was the removal of the crown and abutment to leave the interproximal soft tissue to fill the space previously occupied by the crown. After 3 months, during which time the patient was wearing a provisional restoration (a temporary Maryland bridge), the implant site was treated as an edentulous area with a soft tissue augmentation procedure: the most substantial modification with respect to the original connective tissue platform technique was the use of the wide mesial and distal papillae of the implant, once de-epithelialized on the occlusal surface, as a "partial" connective platform to suture the connective grafts and submerge the implant. At the 4-month reevaluation visit, a minor soft tissue defect remained in both apico-coronal and buccolingual dimensions, and thus a second surgery was performed to obtain further soft tissue augmentation. A flapless punch procedure was used to expose the implant head, and after conditioning the augmented peri-implant soft tissue with a new provisional crown, the definitive restoration was delivered. Complete coverage of the BSTD was achieved, and both papillae entirely filled the interproximal spaces. The results were well maintained up to the 5-year follow-up visit.


Assuntos
Implantes Dentários para Um Único Dente , Implantes Dentários , Tecido Conjuntivo , Coroas , Humanos , Coroa do Dente
9.
Eur Arch Paediatr Dent ; 21(1): 1-11, 2020 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-31414395

RESUMO

AIM: To discuss prevalence, characteristics, aetiology and pathophysiology, diagnosis and management of pre-eruptive intra-coronal radiolucency/resorption (PEIR) defects, and to highlight the clinical significance of PEIR. METHODS: A literature research from Pubmed Medline database was adopted to identify the relevant published articles related to PEIR using keyword search strategy; other papers were obtained through searching the reference lists. Significant findings were summarised and presented in this review. RESULTS: Subject prevalence was (0.2-27.3%) and tooth prevalence was (0.2-3.5%); depending on factors such as type of radiograph used for assessment, demographic factors, age range included, and dentition stage. Currently, the most acceptable etiologic theory for PEIR is intra-coronal resorption by invasion of resorptive cells into forming dentine via an interruption of crown formation; most likely to be caused by local factors such as ectopic position of affected tooth or adjacent tooth next to it. Diagnosis of PEIR lesions occurs, as they are noted incidentally on routine dental radiographs of unerupted teeth. A management protocol for PEIR defects has been suggested based on the literature. The clinical significance of these lesions is that they could constitute a large proportion of occult caries, and can be associated with developmental defects, ectopic positioning and supernumerary teeth, and a delay in dental development. CONCLUSIONS: Early diagnosis of PEIR defects by careful viewing of radiographs of unerupted teeth is important as part of clinical examinations to allow early treatment.


Assuntos
Reabsorção de Dente , Dente não Erupcionado , Dentina , Humanos , Coroa do Dente , Erupção Dentária
10.
Dent Traumatol ; 36(1): 51-57, 2020 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-31373162

RESUMO

BACKGROUND/AIMS: Following coronal tooth fracture, keeping the fragment hydrated is of the utmost importance in the tooth fragment bonding technique. The aim of this study was to evaluate the effects of different immersion times in different storage media on multimode adhesive bonding between reattached fragments and teeth. MATERIALS AND METHODS: A total of 195 bovine incisors were fractured and randomized into the following storage groups (n = 15): G0-control group (sound tooth); GA-saline solution: for 1 hour (A1) or 24 hours (A2); GB-artificial saliva: for 1 hour (B1) or 24 hours (B2); GC-coconut water: for 1 hour (C1) or 24 hours (C2); GD-tap water: for 1 hour (D1) or 24 hours (D2); GE-milk: for 1 hour (E1) or 24 hours (E2); GF-dry (dehydration): for 1 hour (F1) or 24 hours (F2). Tooth fragments were then reattached using a multimode adhesive in a self-mode technique with a flowable resin composite. Fracture resistance was evaluated in a universal testing machine under a compressive load (1 mm/min). The data were submitted to two-way analysis of variance and the post hoc Tukey test (5%). RESULTS: The group submitted to the dehydration factor (GF) exhibited a mean value of 599.1 ± 144.2 N, while those submitted to all hydration protocols (GA, GB, GC, GD, GE) exhibited a mean value of 751.8 ± 285.4 N. Dehydration significantly affected the fracture strength values (P = .005). No significant interaction between the rewetting solutions was observed (P > .05). CONCLUSIONS: Hydration of the tooth fragment increased fracture resistance, regardless of the storage solution and/or immersion time.


Assuntos
Colagem Dentária , Cimentos Dentários , Restauração Dentária Permanente , Fraturas dos Dentes , Animais , Bovinos , Resinas Compostas , Análise do Estresse Dentário , Cimentos de Resina , Coroa do Dente
11.
Clin Oral Investig ; 24(2): 867-874, 2020 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-31218460

RESUMO

OBJECTIVES: Although dental trauma and its unfavorable sequelae are considered major public health problems worldwide, the published data on the prevalence of traumatic crown injuries (TCIs) in Germany are lacking. Therefore, the present study assessed the prevalence of TCIs among adolescents in Bavaria, Germany. MATERIAL AND METHODS: Ethical approval and parental consents were obtained, and population-based information from 10- (N = 1158), 12- (N = 416), and 15-year-olds (N = 1302) from two different cohort studies performed in Bavaria (GINIplus/LISA and LAGZ) were examined for the presence of TCIs, dental caries, and restorations. Statistical comparisons were made using Mann-Whitney U test and Wilcoxon signed-rank test. RESULTS: The prevalence of TCIs was 6.3% in the 10- and 12-year-old children and 14.0% in 15-year-old children, and a higher prevalence was observed in boys than in girls. Most (87.5%) of the traumatized teeth were maxillary incisors. The caries prevalence was low in all three populations. CONCLUSION: The prevalence of TCIs in Bavarian adolescents at a low risk for caries was found to be low. CLINICAL RELEVANCE: Dental trauma is a prevalent event in children and adolescents, and incisors are the most affected teeth. Therefore, dental practitioners should be able to manage the spectrum of traumatic injuries.


Assuntos
Coroas , Cárie Dentária , Adolescente , Criança , Feminino , Alemanha , Humanos , Masculino , Prevalência , Coroa do Dente , Traumatismos Dentários
12.
Anthropol Anz ; 77(1): 27-45, 2020 Feb 13.
Artigo em Inglês | MEDLINE | ID: mdl-31822880

RESUMO

Developmental plasticity, or the ability of physiological development to change in response to environmental pressures (external and internal), results in permanent physiological changes that can shape the later life health experiences of an individual. The timing of non-specific stress in relation to growth and development is critical to this interaction. Dental enamel provides detailed information on the timing of non-specific stress experiences, which may be considered in relation to growth in other physiological systems developing at the same time to elucidate the impact of one on the other. Examples of parallel developing systems include the immune, nervous, cardiovascular, respiratory, renal, and digestive systems (Chamley et al. 2005; MacGregor 2008; Bee & Boyd 2010). This research investigates these patterns through the consideration markers of enamel growth disruption known as accentuated striae of Retzius (AS) in relation to stature and body proportions in human skeletal remains. Anthropometrics and dental samples were collected from two medieval Danish cemetery samples. Residuals were calculated using linear regression from stature in the grave and all metrics were considered in relation to a total number of AS for each individual. A life course approach was also taken by considering AS at different stages of crown development in relation to each metric. Results indicate potential associations between AS and skeletal metrics (particularly tibial length and stature). These are most apparent in relation to AS rates in enamel developing from approximately 2 to 4.8 years of age. These results point to the utility of taking a life course approach in which enamel development is considered in relation to patterns of skeletal growth. Certain limitations and the need for further developments are highlighted by the nature of the results.


Assuntos
Estatura , Dente , Animais , Dinamarca , Esmalte Dentário , História Medieval , Humanos , Coroa do Dente
13.
Dent Mater J ; 39(1): 126-134, 2020 Jan 31.
Artigo em Inglês | MEDLINE | ID: mdl-31611495

RESUMO

The purpose of the study was to test new method for in vitro evaluation of dental material wear with 3D digitization procedure. Thirty dental crowns, made of polyetheretherketone and veneered with composite material, were subjected to wear test. The crown surface was digitized using coordinate measuring machine before and after the performed wear test. Mesh 3D models were reconstructed and average and maximum depth of lost material and volume loss was calculated (GOM Inspect 2016 software). Mean average depth value amounted 12±7 µm, maximum depth value was 42 µm, while mean volume loss was 0.0024 mm3. The smallest measured values were 4 µm for depth value and 0.0003 mm3 for volume loss. Coefficient of variation was very high for all tested parameters (>50%) as a result of data inconsistency. Within the limitations of applied methodology, the possibility of using coordinate measuring machine in measurement of dental material wear was confirmed.


Assuntos
Desgaste dos Dentes , Dente , Coroas , Materiais Dentários , Desgaste de Restauração Dentária , Humanos , Teste de Materiais , Propriedades de Superfície , Coroa do Dente
14.
Arch Oral Biol ; 109: 104575, 2020 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-31589998

RESUMO

OBJECTIVE: The aims of this study were to assess the reliability, reproducibility and validity of mesiodistal and buccolingual measurements comparing these measurements collected using an electronic hand-held digital calliper, on dry dentitions and on dental casts, with measurements obtained from 3D digital models created using a portable intra-oral scanner. DESIGN: The mesiodistal and buccolingual diameter of the crown of 1304 teeth were measured on dry dentitions and on dental casts, and secondly on 3D digital models created using an intra-oral 3D scanner. Reliability, reproducibility and validity were evaluated using the intraclass correlation coefficient (ICC) and the Bland-Altman graphic method. RESULTS: The results of the intraclass correlation coefficient expressed an excellent degree of agreement in the intra- and inter-observer error analysis, as well as in the comparison of the mesiodistal and buccolingual dimensions taken with the calliper and those taken in digital 3D models. The results of the Bland-Altman method showed that the greatest differences were found in the mesiodistal diameter of the molars and in the buccolingual diameter of the upper premolars. CONCLUSIONS: Mesiodistal and buccolingual measurements obtained from digital 3D models are suitable for recording dentitions for forensic purposes.


Assuntos
Modelos Dentários , Imageamento Tridimensional , Coroa do Dente , Dente Pré-Molar , Humanos , Dente Molar , Reprodutibilidade dos Testes
15.
Hua Xi Kou Qiang Yi Xue Za Zhi ; 37(6): 642-647, 2019 Dec 01.
Artigo em Chinês | MEDLINE | ID: mdl-31875444

RESUMO

OBJECTIVE: This study evaluates the effects of different endodontic access methods and full-ceramic crown on the stress distribution in the maxillary central incisor by using three-dimensional finite element analysis. METHODS: Computed tomography scans of the maxillary central incisor were used to construct a three-dimensional finite element model of the maxillary central incisor. According to the different methods of endodontic and the prosthetic treatments, four models were established, namely, group A (traditional access cavity preparation with resin filling), group B (traditional access cavity preparation restored full-ceramic crown), group C (minimally invasive endodontics with resin filling) and group D (minimally invasive endodontics restored full-ceramic crown). A static force of 100 N and a direction of 45° was applied to the long axis of the tooth at the junction of the incisal section one-third and middle section one-third. The maximum principal stress, the von Mises stress and the modified von Mises stress of the tooth tissue were analyzed using the finite-element analysis software. RESULTS: 1) Stress peaks: the stress peaks of the maximum principal stress, the von Mises stress and the modified von Mises in group A were the largest, except that the stress peak of von Mises stress in group D was slightly lower than that in group C. The stress peaks of the maximum principal stress and the modified von Mises in group C were the lowest. The stress peaks of the maximum principal stress and the modi-fied von Mises stress in group D were lower than those in groups A and B. 2) Stress distribution: compared with group A, the stress distribution of cervical dentin and the area of stress concentration in group C was lower and smaller. In the root dentin, the stress distribution in group C was more uniform than that in group A, and the stress was dispersed to several areas of the root apex. After crown restoration, no significant difference was observed in stress distribution between groups B and D in the root region. The stress distribution state of group B was not significantly different from that of group A. No significant difference was observed in the stress distribution state between groups D and C. CONCLUSIONS: 1) From the perspective of biomechanics, the minimally invasive access was adopted for the maxillary central incisor. 2) Full crown restoration is recommended after traditional access cavity preparation. No obvious advantage is observed in stress analysis for minimally invasive endodontics-restored full-ceramic crown.


Assuntos
Incisivo , Técnica para Retentor Intrarradicular , Coroas , Análise do Estresse Dentário , Dentina , Análise de Elementos Finitos , Estresse Mecânico , Coroa do Dente
16.
Hua Xi Kou Qiang Yi Xue Za Zhi ; 37(5): 551-555, 2019 Oct 01.
Artigo em Chinês | MEDLINE | ID: mdl-31721507

RESUMO

Crown lengthening is one of the most common surgeries in clinical practice. Under the premise of ensuring the biologic width, the adequate crown is exposed by resecting the periodontal soft tissue and (or) hard tissue to meet the prosthodontic and (or) aesthetic requirements. Considering the various advantages of oral laser, such as safe, precise, minimally invasive and comfort, laser has become a promising technology which can be used to improve the traditional crown lengthening. In this review, the principles and characteristics of laser application in crown lengthening, especially in the minimally invasive or flapless crown lengthening will be reviewed. Its pros and cons will also be discussed.


Assuntos
Aumento da Coroa Clínica , Dente , Coroas , Estética Dentária , Coroa do Dente
17.
Prog Orthod ; 20(1): 43, 2019 Nov 22.
Artigo em Inglês | MEDLINE | ID: mdl-31754914

RESUMO

BACKGROUND: The aim of the study was to assess the accuracy of commercially available software in estimating anterior tooth root inclination from digital impressions of the crowns of the teeth. SUBJECTS AND METHODS: Following sample size calculation and application of inclusion and exclusion criteria, 55 anterior natural teeth derived from 14 dry human skulls were selected. Impressions were taken and plaster study models were fabricated. Plaster models were scanned using the high-resolution mode of an Ortho Insight 3D laser scanner. The teeth on the digital scans were segmented and virtual roots were predicted and constructed by the Ortho Insight 3D software. The 55 natural teeth were removed from the dry skulls and scanned using the Identica extraoral white-light scanner in order to calculate their actual root angulation. The teeth were scanned twice, once to acquire the crown and the cervical part of the root, and a second time to acquire the remaining part of the root, including the apex. The two scanned segments were joined in software by superimposing them along their common part. The accuracy of the digital models generated by the Ortho Insight 3D scanner in predicting root angulation was assessed by comparing these results to the corresponding measurements of the 55 natural teeth. The long axes of the tooth models obtained from the software prediction and the scanning of the actual teeth were computed and the discrepancy between them was evaluated. The error of the methods was evaluated by repeating the measurements on 14 teeth and showed an acceptable range. RESULTS: The predicted tooth angulation was found to differ significantly from the actual angulation, both statistically and clinically. The angle between the predicted and actual long axes ranged from 2.0 to 37.6°(average 9.7°; median 7.4°). No statistically significant difference was found between tooth categories. CONCLUSIONS: Further investigations and improvements of the software are needed before it can be considered clinically effective.


Assuntos
Imageamento Tridimensional , Dente , Modelos Dentários , Humanos , Software , Coroa do Dente
18.
Spec Care Dentist ; 39(6): 624-630, 2019 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-31661162

RESUMO

The presence of dental abnormalities in the same individual may be related to syndromic cases and occur through associated systemic changes. Kabuki syndrome presents well-defined systemic changes, but its clinical characteristics related to the oral cavity have not been fully explained. This study aimed to report the dental changes in a child diagnosed with Kabuki syndrome. A male brown patient aged 2 years and 7 months, accompanied by his mother to the dental visit, they main complaint was the presented of an additional tooth behind upper right central incisor. Anamnesis, intra- and extraoral examinations, and dental X-rays were performed, revealing a talon cusp. Considering the dental clinical findings, the patient was referred to a medical geneticist who additionally requested cardiological and genetic examinations, which established the Kabuki syndrome. The caregivers were advised that the talon cusp would not cause any injury to the natural exfoliation of the tooth and that oral hygiene should be performed carefully. Abnormalities in the oral cavity and developmental delay may be associated with a potential undiagnosed syndrome. The medical evaluation becomes decisive for investigation, diagnosis, and final conduct of the case.


Assuntos
Anormalidades Dentárias , Coroa do Dente , Anormalidades Múltiplas , Criança , Pré-Escolar , Dentição , Face/anormalidades , Seguimentos , Doenças Hematológicas , Humanos , Masculino , Doenças Vestibulares
19.
Mymensingh Med J ; 28(4): 862-865, 2019 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-31599252

RESUMO

Although esthetic factors might limit by the presentation of materials used, all-metal complete cast crown should always be offered to patients requiring restoration of endodontically treated posterior tooth. The complete cast crown has the highest longevity of all fixed restorations. It could be used to rebuild a single tooth or a retainer for a fixed prosthesis. It involves all the axial walls as well as the occlusal surface of the tooth to be restored. All restorations are placed in the oral environment in contact with the gingival tissue. Thus clinicians must choose nontoxic or least toxic metal alloys, since any release of elements that might cause reactions. This study was designed to observe clinical responses of nickel chromium alloy and gold alloy cast crown and provide guidance to ascertain the best alloy for cast metal crown, which serves better functional restoration.


Assuntos
Ligas de Ouro , Níquel , Coroa do Dente , Cromo , Ligas de Cromo , Corrosão , Ouro , Humanos
20.
Gen Dent ; 67(6): 59-61, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31658027

RESUMO

Tooth fusion, the union of 2 developing dental germs, can affect the primary and permanent dentitions as well as supernumerary teeth. The anatomy of fused teeth represents a challenge when endodontic treatment is needed. This case report describes the endodontic treatment performed in a permanent maxillary incisor fused to a supernumerary tooth. A 10-year-old girl was referred for endodontic treatment in her maxillary left central incisor, which displayed a wide and bifid crown. Periapical radiographs showed that the tooth had 2 crowns with fused roots; the pulp chambers of the crowns communicated with each other at the cervical third of the tooth. Local anesthetic was administered, and a rubber dam was used to isolate the tooth. The clinician then completed preparation of the access cavity and examined the root canals of the fused teeth. After chemical-mechanical instrumentation, the clinician obturated the root canals using Tagger's hybrid technique. The pulp chamber was sealed with glass ionomer cement, and the patient was referred for restorative treatment. Teeth with morphologic abnormalities must be treated with a multidisciplinary approach to ensure a better prognosis.


Assuntos
Dentes Fusionados , Dente Supranumerário , Criança , Feminino , Humanos , Incisivo , Maxila , Tratamento do Canal Radicular , Coroa do Dente
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