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1.
Am J Dent ; 33(5): 227-234, 2020 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-33017523

RESUMO

PURPOSE: To evaluate the influence of different post-endodontic techniques on the fatigue survival and biomechanical behavior of crowned restored central incisors. METHODS: The crowns of 69 bovine incisors were cut, and the roots were treated endodontically and assigned randomly into three groups (n=23): resin composite buildup (BUP), glass fiber post-retained resin composite buildup (GFP), and cast post-and-core (CPC). They received full crown preparation with 2 mm ferrule, and a leucite-reinforced ceramic crown was cemented adhesively. Three specimens from each group were tested monotonically. The remaining specimens were subjected to the stepwise stress fatigue test until fracture or suspension after 1.5 x 106 cycles in a chewing simulator. The load and step at which each specimen failed were analyzed by Kaplan-Meier and Mantel-Cox (log-rank test) statistics, followed by multiple pairwise comparisons, at 5% significance level. The three groups tested (BUP, GFP, and CPC) were 3D modeled (Rhinoceros 4.0) and the maximum principal stress (MPa) criteria were used to calculate the results using FEA. RESULTS: There was no statistical difference between the treatments regarding the load or the number of cycles (Mantel-Cox log-rank test for trend, X²= 0.015, df=1, P= 0.901, X²=3.171, df=1, P= 0.995). Crown cracks were the predominant failure mode, and oblique root fractures were only observed in groups GFP and CPC. In endodontically treated incisors with a 2-mm ferrule, the post-endodontic treatment had no significant effect on fatigue survival. Non-restorable fractures only occurred in teeth restored with posts. CLINICAL SIGNIFICANCE: Although the clinical significance of laboratory studies has some limitations, this study suggests that composite buildups without posts may be an option for restoring endodontically treated incisors with 2 mm ferrule height.


Assuntos
Incisivo , Técnica para Retentor Intrarradicular , Animais , Bovinos , Resinas Compostas , Coroas , Análise do Estresse Dentário
2.
J Contemp Dent Pract ; 21(7): 723-727, 2020 Jul 01.
Artigo em Inglês | MEDLINE | ID: mdl-33020353

RESUMO

AIM: To compare the angulation of maxillary left (UL) and right (UR) incisors and the width of alveolar bone. MATERIALS AND METHODS: This study was conducted using archived cone-beam computed tomography (CBCT) images of 50 male and 50 female patients. The UL and UR incisors were compared in terms of incisor/palatal plane angle, collum angle, labiopalatal crown-root position, and alveolar bone width (ABW). The comparison, with reference to gender and age, was analyzed using one-way analysis of variance and independent sample t test. RESULTS: There is no substantial variance in the average differences of the assessed variables for UR and UL central incisors (p > 0.05). No significant association was found between crown labial to root and root labial to crown positions for both central incisors (p > 0.05). Statistical analyses revealed that tooth type has no significant association with the central incisors-related variables. Alveolar bone width, at various areas assessed, showed significant relation to gender. On the other hand, incisor/palatal plane angle and ABW at the cementoenamel junction and at level of Point A (subnasale) were significantly affected by age. CONCLUSION: Gender can significantly affect the development of ABW. Also, incisor/palatal plane angle and ABW at certain areas are correlated with age. CLINICAL SIGNIFICANCE: Understanding the similarities or differences between right and left maxillary central incisors may give better indication if cephalometric images are accurate in attaining such measurements. This in turn will also help orthodontist to choose the proper tool for treatment decision-making related to incisor tooth movement.


Assuntos
Incisivo/diagnóstico por imagem , Maxila/diagnóstico por imagem , Tomografia Computadorizada de Feixe Cônico , Feminino , Humanos , Masculino , Palato , Coroa do Dente
3.
J Contemp Dent Pract ; 21(7): 803-807, 2020 Jul 01.
Artigo em Inglês | MEDLINE | ID: mdl-33020367

RESUMO

AIM: To demonstrate an exceptional result in the treatment of an avulsed tooth that had been stored in a dry environment for over 2 hours before being replanted. BACKGROUND: Sixteen percent of all traumatic injuries to the permanent dentition are avulsions. Maxillary central and lateral incisors are most commonly affected. CASE DESCRIPTION: In this report, a 7-year-old girl sustained trauma to the upper right maxillary incisor during a bicycle accident. The tooth was avulsed and remained outside the oral cavity for more than 2 hours in a dry napkin before eventual reimplantation in the emergency room. Upon presentation to the endodontic clinic at the University of Southern California, the case was assessed, and the available treatment options discussed with the patient's parents. Revascularization using BC putty was the chosen mode of treatment. At a 6-month recall appointment, the patient presented with a sinus tract. A decision was then made to perform apexification using the mineral trioxide aggregate (MTA) as an apical filling material. To date, the tooth remains intact and functional. CONCLUSION: Although both of the described treatment modalities are acceptable and commonly used in modern endodontics, apexification of a tooth following a failed attempt of a regenerative procedure has not been described. In this case, a chronic abscess formed and the ultimate goal of revascularization was not achieved. However, the performance of the revascularization procedure was not without benefit since it allowed the tooth to develop in both length, dentinal volume, and aided in the partial closure of the apical foramen. Additional studies are needed regarding the treatment of avulsed teeth. This case study may provide a viable treatment alternative in a number of clinical situations. CLINICAL SIGNIFICANCE: The procedures described in this case report may be of clinical significance in the treatment and retention of teeth, which may otherwise be considered to have a poor prognosis and extracted.


Assuntos
Apexificação , Avulsão Dentária/cirurgia , Avulsão Dentária/terapia , Criança , Feminino , Humanos , Incisivo , Maxila/cirurgia , Ápice Dentário
4.
Shanghai Kou Qiang Yi Xue ; 29(3): 298-303, 2020 Jun.
Artigo em Chinês | MEDLINE | ID: mdl-33043348

RESUMO

PURPOSE: To explore the percentage of residual support height (Ph) and the percentage of residual root surface area (Ps) in evaluating periodontal support ability by simulating different stages of periodontitis based on the curved surface modeling. METHODS: Fifteen cone-beam CT (CBCT) images including 420 teeth in total were collected. The data were reconstructed into 3-dimensional teeth models by Mimics software.The 3D surface model of the tooth was then optimized by Geomagic software and then imported into Solidworks software to simulate different periodontal support height. Ph and Ps were measured and calculated to evaluate the consistency of Ph and Ps results in all tooth types. The data were analyzed with SPSS 22.0 software package. RESULTS: RSA in incisors, canines and premolars: coronal 1/3>middle 1/3>apical 1/3. RSA in molars: middle 1/3>coronal 1/3>apical 1/3. Maxillary first molar had the largest RSA, accounting for 11.60% of the dentition, which was about 3.18 times than mandibular central incisor. The difference between Ph and Ps in all types of teeth was statistically significant (P<0.01). The 95% confidence interval(CI) of the difference between Ph and Ps in the maxillary incisor, mandibular incisor, mandibular canine was between the clinical consistency limit (-15%, 15%). In the remaining tooth types, 95%CI of the difference between Ph and Ps was beyond the clinical consistency limit (-15%, 15%). CONCLUSIONS: For single-root tooth, except maxillary canine, the remaining periodontal support height could replace periodontal support area. For multi-rooted tooth, judging the ability of periodontal support ability only by alveolar bone absorption ratio in 2D index has significant limitations. Full consideration is needed to focus on root morphological discrepancy when determining the extent of periodontal disease.


Assuntos
Periodonto , Raiz Dentária , Dente Pré-Molar , Tomografia Computadorizada de Feixe Cônico , Incisivo , Periodonto/diagnóstico por imagem
5.
Zhonghua Kou Qiang Yi Xue Za Zhi ; 55(10): 799-802, 2020 Oct 09.
Artigo em Chinês | MEDLINE | ID: mdl-33045795
6.
Beijing Da Xue Xue Bao Yi Xue Ban ; 52(5): 907-912, 2020 Oct 18.
Artigo em Chinês | MEDLINE | ID: mdl-33047728

RESUMO

OBJECTIVE: To evaluate the clinical success of the treatment of maxillary anterior primary incisors caries with composite resin strip crowns. METHODS: Children who presented with severe early childhood caries and were treated comprehensive caries under general anesthesia from January to December 2016 were enrolled in this study. Composite crowns using preformed celluloid crown (3M ESPE, USA) called as "strip crown technique" were applied to treat vital primary incisors with two or multiple surface cavities. Selective etchings of enamel, Universal Bond adhesive and 3M Z350 resin were used to make strip crowns. The patients returned at the end of 6, 12 and 18 months and received clinical and radiologic examinations. Dentists who did not attend the treatment evaluated the strip crowns clinically by modified United States Public Health Service (USPHS) criteria. RESULTS: Four hundred eighteen restorations, placed in 127 children aged 1.17-5.75 years (average of 3.22), were evaluated. The overall retention rate was 97.8% at the end of 6 months, 93.6% at 12 months and 89.2% at 18 months. After 18 months, 28 restorations (6.7%) were totally lost and 4.1% were rated as having lost some resin material. Only four teeth (1.0%) had secondary caries at the end of 18 months and 1.4% teeth had pulpal pathology requiring root canal treatment. Composite crowns had good performance in contour and adjacent contact and improved aesthetics significantly. Twenty-nine teeth (6.9%) showed mild gingivitis and 93.1% showed healthy gingival. 11.2% of the teeth demonstrated color change because plaque accumulation and the polish could remove the stains. The complete loss of strip crowns was mainly related to eating bites. CONCLUSION: Strip crowns performed well for restoring primary incisors with large or multisurface caries for periods of over 18 months. The strip crowns can be a durable and aesthetic restoration for vital carious primary incisors with adequate tooth structure after caries removal. Functional movement is an important cause of complete loss. Because of the high technical sensitivity and its requirement of the cooperation of children, strip crowns are more suitable for older and cooperative children as well as children receiving dental treatment under sedation or general anesthesia.


Assuntos
Incisivo , Dente Decíduo , Criança , Pré-Escolar , Resinas Compostas , Coroas , Humanos , Lactente , Maxila , Estados Unidos
7.
Beijing Da Xue Xue Bao Yi Xue Ban ; 52(5): 924-930, 2020 Oct 18.
Artigo em Chinês | MEDLINE | ID: mdl-33047731

RESUMO

OBJECTIVE: To explore the applicability of integration between three-dimensional (3D) facial and dental data to evaluate the nasolabial morphology variation before and after the cross-arch fixed restoration of the maxillary implant-supported prostheses. METHODS: Twelve patients (4 women and 8 men), mean age (54.82±5.50) years (from 45 to 62 years) referred to the Department of Oral Implan-tology, Peking University School and Hospital of Stomatology, were selected and diagnosed with edentulous maxilla. For all the patients, 4 to 6 implants were inserted into the maxilla. Six months later, the final cross-arch fixed prostheses were delivered. The 3D facial images were collected before and after the final restoration. The 3D data of prostheses were also captured. All the 3D data were registered and measured in the same coordinate system. Then the displacement of all the landmarks [cheilion left (CHL), cheilion right (CHR), crista philtri left (CPHL), crista philtri right (CPHR), labrale supe-rius (LS), subnasale (SN), stomion (STO), upper incisor (UI), upper flange border of the prostheses (F-point, F)], and the variation of the distances between these landmarks (SN-LS, CPHR-CPHL, CHR-CHL, LS-STO) were analyzed and compared. RESULTS: The consistency test among three measurements of the length of F-SN indicated that the integration method of the dental prostheses and soft tissue had the good repetitiveness, ICC=0.983 (95%CI: 0.957-0.995). After wearing the final cross-arch maxillary implant-supported prostheses, all the landmarks on the soft tissue moved forward. The nasal base area changed minimally, and the shift of SN in the sagittal direction was only (0.61±0.44) mm. But the sagittal shift of LS was (3.12±1.38) mm. In the vertical direction, SN, LS, CPHL, and CPHR moved upward. But STO, CHL, and CHR moved downward a little. Except for the slight decrease of the length of philtrum (SN-LS), the length of CHL-CHR, CPHL-CPHR, and the height of upper lip were increased together (P < 0.01). In the direction of Z axis, the strong correlations were found not only between the movements of SN and F (r=0.904 3) but also between the movements of LS and UI (r=0.958 4). CONCLUSION: The integration method of 3D facial and dental data showed good repetitiveness. And the strong correlations between the landmarks of prostheses and nasolabial soft tissue in the sagittal direction were found by this new method.


Assuntos
Maxila , Boca Edêntula , Feminino , Humanos , Incisivo , Lábio , Masculino , Maxila/cirurgia , Pessoa de Meia-Idade , Próteses e Implantes
8.
Chin J Dent Res ; 23(3): 183-189, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32974618

RESUMO

OBJECTIVE: To design and fabricate 3D-printed rigid constraint guides for the tooth preparation for laminate veneers and to evaluate the accuracy of guide-assisted preparation. METHODS: Twenty maxillary right central incisor resin artificial teeth were randomly divided into two equal groups and prepared for laminate veneers. Tooth preparations were performed, assisted by guides in the test group and by depth gauge burs in the control group, and both were finished by freehand operation. The typodonts were 3D scanned before preparation, after initial preparation and after final preparation. The tooth preparation depths at each step, including initial preparation depth, final preparation depth and loss of tooth tissue during polishing, were measured by 3D deviation analysis. Statistical analyses were conducted to investigate differences. RESULTS: The initial preparation depth was 0.488 mm (median, quartile 0.013 mm) in the test group and 0.521 mm (median, quartile 0.013 mm) in the control group. A statistically significant difference was found between them (P < 0.05). The final preparation depth in the test group (0.547 ± 0.029 mm) was significantly less than that in the control group (0.599 ± 0.051 mm) (P < 0.05), and closer to the predesigned value (0.5 mm). There was no statistically significant difference in the loss of tooth tissue during polishing between the test group (0.072 ± 0.023 mm) and the control group (0.089 ± 0.038 mm) (P > 0.05). CONCLUSION: In maxillary central incisors, the tooth preparation for laminate veneers could be conducted using 3D-printed rigid constraint guides, the accuracy of which is better than that of depth gauge burs.


Assuntos
Porcelana Dentária , Facetas Dentárias , Incisivo , Lasers , Preparo do Dente
9.
Chin J Dent Res ; 23(3): 199-204, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32974620

RESUMO

OBJECTIVE: To investigate the bilateral symmetry of double root canals, variation in root canal bifurcation and position of canal orifices in mandibular incisors in a Chinese population. METHODS: A total of 149 subjects with mandibular incisors with two canals were selected from 866 patients based on CBCT images and divided into three groups: group 1 (< 21 years), group 2 (21-40 years) and group 3 (> 40 years). The prevalence of bilateral symmetry of double root canals (type III and type V), the distance between the cementoenamel junction (CEJ) and the bifurcation (D1) and the distance between the two canal orifices (D2) were calculated and analysed. RESULTS: The bilateral symmetry of type III for mandibular central incisors (MCIs) (44.4%) was significantly lower than that for mandibular lateral incisors (MLIs) (63.4%). D1 was greater in group 1 (4.63 ± 1.35mm) than in group 2 (3.99 ± 1.02 mm) and group 3 (3.90 ± 1.95 mm). D2 was shorter in in MCIs (0.65 ± 0.20 mm) than in MLIs (0.74 ± 0.22 mm). CONCLUSION: Special attention is required in the root canal treatment of mandibular incisors, especially in patients aged above 21 years.


Assuntos
Cavidade Pulpar/diagnóstico por imagem , Incisivo , Adulto , Tomografia Computadorizada de Feixe Cônico , Humanos , Mandíbula/diagnóstico por imagem , Raiz Dentária , Adulto Jovem
10.
Chin J Dent Res ; 23(3): 205-214, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32974621

RESUMO

This report describes the cases of two patients with a maxillary lateral incisor with palatogingival groove and extensive endodontic-periodontal lesions. Although it is reported that acceptable periodontal status is of great importance in case selection in intentional replantation, it is suggested in this report that intentional replantation could be chosen instead of immediate extraction if extensive endodontic-periodontal lesions exist in a tooth with palatogingival groove. The gingival margin position and gingival papilla were well preserved and the bone defect was almost completely repaired. This was beneficial to the aesthetic prosthodontic treatment and implantation, although external root resorption was observed.


Assuntos
Reimplante Dentário , Raiz Dentária/cirurgia , Gengiva/cirurgia , Humanos , Incisivo/cirurgia , Tratamento do Canal Radicular
11.
Am J Orthod Dentofacial Orthop ; 158(4): e37-e42, 2020 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-32988573

RESUMO

INTRODUCTION: With the increasing demand for facial esthetics, patients' expectations regarding dental treatment have increased. The treatment of maxillary median diastemas (MMDs) stands out as one of the most noticeable esthetic alterations performed on patients. The objectives of the present article were to evaluate the effects of MMD and its restorations on the esthetics of a smile and to determine the differences in esthetic perceptions among 3 different groups of patients: orthodontists, prosthodontists, and laypeople. METHODS: Printed photographic images were randomly arranged in an album that contained the original photograph of the smile, 8 photographs with digitally created diastemas (0.5 mm, 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm, 4.0 mm, and 5.0 mm), and 8 with simulated restorations of these spaces. Each evaluator assigned scores to the images using a 100-mm visual analogue scale. RESULTS: Orthodontists, prosthodontists, and laypeople presented similar perceptions regarding the levels of attractiveness of the original smiles and those of smiles involving restorations of diastemas with widths of 0.5 mm and 1.0 mm. The ratings assigned to the smiles with diastemas differed significantly from those of the corresponding restored smile with the same magnitude of diastema. CONCLUSIONS: The prosthetic space closure of diastemas is better than leaving the space untreated. Restorations of MMD up to 1 mm perform similar to orthodontic closure. Larger MMDs are ideally treated with orthodontics because the restorative treatment is more invasive, leading to incremental damage to the dental tissues.


Assuntos
Diastema/terapia , Atitude do Pessoal de Saúde , Estética Dentária , Humanos , Incisivo , Maxila
12.
Dental Press J Orthod ; 25(4): 23e1-23e7, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32965383

RESUMO

OBJECTIVE: This study aimed to compare the root length of maxillary and mandibular incisors between individuals with open bite versus matched individuals with adequate overbite. METHODS: This comparative, matched and retrospective study included 48 cone beam computed tomographies (CBCTs) obtained at a university radiological center. Scans belonged to 24 individuals with open bite (overbite ≤ 0 mm) and 24 individuals with adequate overbite (controls). Both groups were matched by age, sex, malocclusion classification and skeletal characteristics (ANB and FMA angles). Root length of each maxillary and mandibular incisor was measured in millimeters (mm) in a sagittal section from a perpendicular line to the enamel cement junction until the root apex (384 length measurements were made). The means of root length in both groups were compared using t-tests. In addition, correlations between variables were evaluated with the Pearson correlation coefficient (α = 0.05). RESULTS: In both groups, the root length of the upper central incisors was approximately 12 mm and the root length of the maxillary lateral incisors was approximately 13 mm (p˃ 0.05). Likewise, the root length of lower central incisors in both groups measured approximately 12 mm (p˃ 0.05). However, the mandibular lateral incisor roots of open bite patients were significantly longer than in the normal overbite patients (approximately 1 mm, p= 0.012 right side, p= 0.001 left side). CONCLUSIONS: Root length of maxillary incisors and central mandibular incisor is similar in individuals with or without open bite, but the mandibular lateral incisor roots in open bite patients were significantly longer than in the normal overbite patients.


Assuntos
Mordida Aberta/diagnóstico por imagem , Tomografia Computadorizada de Feixe Cônico Espiral , Cefalometria , Tomografia Computadorizada de Feixe Cônico , Humanos , Incisivo/diagnóstico por imagem , Maxila/diagnóstico por imagem , Estudos Retrospectivos
13.
Dental Press J Orthod ; 25(4): 44-50, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32965386

RESUMO

OBJECTIVE: To perform a numerical simulation using FEM to study the von Mises stresses on Mushroom archwires. METHODS: Mushroom archwires made of titanium-molybdenum alloy with 0.017 x 0.025-in cross-section were used in this study. A YS of 1240 MPa and a Young's modulus of 69 GPa were adopted. The archwire was modeled in Autodesk Inventor software and its behavior was simulated using the finite element code Ansys Workbench (Swanson Analysis Systems, Houston, Pennsylvania, USA). A large displacement simulation was used for non-linear analysis. The archwires were deformed in their extremities with 0° and 45°, and activated by their vertical extremities separated at 4.0 or 5.0 mm. RESULTS: Tensions revealed a maximum of 1158 MPa at the whole part of the loop at 5.0mm of activation, except in a very small area situated at the top of the loop, in which a maximum of 1324 Mpa was found. CONCLUSIONS: Mushroom loops are capable to produce tension levels in an elastic range and could be safely activated up to 5.0mm.


Assuntos
Agaricales , Incisivo , Fenômenos Biomecânicos , Módulo de Elasticidade , Análise de Elementos Finitos , Estresse Mecânico
14.
Eur J Paediatr Dent ; 21(3): 243-247, 2020 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-32893660

RESUMO

AIM: Research aimed to gather aepidemiological parameters of MIH from a sample of Sarajevo children born between the years 1999 and 2003. Prevalence of MIH, distribution according to severity (mild vs. moderate/severe cases) and distribution according to phenotypes (MIH vs MH) were investigated. MATERIALS AND METHODS: Study design: This was a cross-sectional, observational, aepidemiological study that was conducted on a sample of 446 children aged 6 to 9 years. It was conducted as a part of regular dental screening of children attending a randomly selected primary school in the Bosnian capital city of Sarajevo. RESULTS: The overall prevalence of MIH was 11.5%. MIH prevalence varied between 19.9% of examinees born in year 2002 to 8.4% among those born in 2003. Number of teeth affected varied from 1 to 7. The average number of affected teeth was 3.82 ± 1.46. Demarcated opacities were recorded on 13.89%, post-eruptive enamel breakdown on 11.28% and atypical filling on 6.2% index teeth. Mild cases of MIH were rare in our sample, 18% of subject had only demarcated opacities present. A smaller percentage of examinees (35.3%) had hypomineralisation present only on first permanent molars (MH group). Out of 64.7% of subjects in MIH group, 37.25% had one incisor affected and 21.57% had two incisors affected. CONCLUSION: Over 80% of study subjects with MIH were categorised as moderate/severe case of MIH and they represent a major problem with regards to dental treatment. It is necessary to plan a multi-disciplinary approach for dental care of this population. It is necessary to educate primary care dentists to recognise this condition and provide recommended treatment to patients with mild clinical picture, while directing those with more severe problems to specialised doctors.


Assuntos
Hipoplasia do Esmalte Dentário , Dente Molar , Criança , Estudos Transversais , Humanos , Incisivo , Prevalência
15.
Eur J Paediatr Dent ; 21(3): 209-212, 2020 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-32893654

RESUMO

AIM: The aim of this paper is to provide clinicians useful information for the management of impacted central incisor due to early childhood trauma. CASE REPORT: It is reported the case of an impacted right maxillary central incisor in an 8-year-old male patient who had an intrusive luxation trauma of primary tooth at the age of 4. After clinical and radiographic evaluation, a multidisciplinary treatment plan was planned. Therapy involved a surgical and orthodontic approach in order to expose the tooth and move the incisor in the normal position with a self-ligating appliance system. RESULTS: Through a multidisciplinary approach it was possible to move the impacted incisor in the occlusal plane, preserving periodontal tissues and tooth vitality. CONCLUSION: When a permanent tooth is impacted, the multidisciplinary approach of surgery and orthodontic treatment is the best way to obtain a suitable outcome in terms of gingival contour, occlusal plane and aesthetics, when compared with other treatment options.


Assuntos
Incisivo , Dente Impactado , Criança , Pré-Escolar , Dentição Permanente , Humanos , Masculino , Maxila
16.
Eur J Paediatr Dent ; 21(3): 238-242, 2020 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-32893659

RESUMO

BACKGROUND: Molar Incisor Malformation (MIM) or Molar Root Incisor malformation (MRIM) is a recently discovered root malformation with constricted pulp and abnormally located furcation presented in permanent first molars and sometimes incisors. CASE REPORT: Two cases that feature MIM are presented with the description of the characteristic tooth form, clinical/radiographic examination, medical history, the supposed aetiology, treatment procedure and results at the 2-year follow-up. Conservative endodontic treatment was performed in both cases, furcation perforation and canal perforation were filled with MTA (Mineral Trioxide Aggregate), and a good prognosis was observed after 2 years of follow-up. Furthermore, recommended treatment options are discussed to provide a more appropriate treatment for the patients. CONCLUSION: Patients with MIM need to be treated at the right time to avoid severe infection and other problems. Early diagnosis with appropriate treatment is more likely to lead to a more favourable prognosis.


Assuntos
Incisivo , Materiais Restauradores do Canal Radicular , Compostos de Alumínio , Compostos de Cálcio , Polpa Dentária , Cavidade Pulpar , Combinação de Medicamentos , Humanos , Dente Molar , Óxidos , Silicatos , Raiz Dentária
17.
Compend Contin Educ Dent ; 41(8): e10-e15, 2020 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-32870702

RESUMO

The treatment of incisor protrusion by means of tooth extraction can be challenging for orthodontists, especially during the space closure phase. Moreover, the level of difficulty may increase when anterior movement of the posterior teeth is not desirable. Treatment alternatives may include the use of mini implants, mini plates, and extraoral devices to reinforce anchorage; however, some patients may oppose these aggressive methods. This article describes the use of frictionless segmented mechanics that provide differential moments for controlled space closure during full retraction of the incisors without using extraoral forces or temporary anchorage devices.


Assuntos
Implantes Dentários , Procedimentos de Ancoragem Ortodôntica , Cefalometria , Humanos , Incisivo , Fechamento de Espaço Ortodôntico , Técnicas de Movimentação Dentária
18.
Braz Oral Res ; 34: e116, 2020 Sep 04.
Artigo em Inglês | MEDLINE | ID: mdl-32901731

RESUMO

The exposure to amoxicillin has been associated with molar incisor hypomineralization. This study aimed to determine if amoxicillin disturbs the enamel mineralization in in vivo experiments. Fifteen pregnant rats were randomly assigned into three groups to received daily phosphatase-buffered saline or amoxicillin as either 100 or 500 mg/kg. Mice received treatment from day 13 of pregnancy to day 40 postnatal. After birth, the offsprings from each litter continued to receive the same treatment according to their respective group. Calcium (Ca) and phosphorus (P) content in the dental hard tissues were analyzed from 60 upper first molars and 60 upper incisors by the complexometric titration method and colorimetric analysis using a spectrophotometer at 680 nm, respectively. Lower incisors were analyzed by X-ray microtomography, it was measured the electron density of lingual and buccal enamel, and the enamel and dentin thickness. Differences in Ca and P content and electron density among the groups were analyzed by one-way ANOVA. There was no significant difference on enamel electron density and thickness among the groups (p > 0.05). However, in incisors, the higher dose of amoxicillin decreased markedly the electron density in some rats. There were no statistically significant differences in Ca (p = 0.180) or P content (p = 0.054), although the higher dose of amoxicillin could affect the enamel in some animals. The amoxicillin did not significantly alter the enamel mineralization and thickness in rats.


Assuntos
Esmalte Dentário , Amoxicilina , Animais , Hipoplasia do Esmalte Dentário , Feminino , Incisivo , Camundongos , Dente Molar , Gravidez , Ratos
19.
Braz Oral Res ; 34: e118, 2020 Sep 04.
Artigo em Inglês | MEDLINE | ID: mdl-32901733

RESUMO

Agenesis of lateral incisors, besides the functional issues, represents a great esthetic drawback. The selection of an appropriate treatment is a complex decision, which should consider the stability of the clinical outcomes over time. The aim of the present study was a histological and clinical comparison of two-stage split crest technique (SCT), with bone chips alone or mixed with porcine bone in patients affected by unilateral and bilateral agenesis of the upper lateral incisors. Eleven patients were enrolled, and randomly assigned to receive a treatment with autologous bone chips (group 1) or autologous bone chips mixed 1:1 to porcine-derived xenogenic bone (group 2). After a 2-month healing period, implants were placed and biopsies harvested for histomorphometrical evaluation. Clinical assessment, according to ICOI PISA health scale, and radiographic marginal bone loss evaluation at 12- and 24-month follow-ups were conducted. The histomorphometry showed significantly greater new bone formation (p > 0.0229) in group 2. At 12- and 24-month follow-ups, all the evaluated implants, regardless of the group they were allocated, could be categorized as "success" in the ICOI Pisa Health Scale for Dental Implants, and did not show significant difference in crestal bone loss. To the best of our knowledge, these are the first histological and clinical outcomes indicating that the use of bone chips mixed 1:1 to porcine bone in SCT could be a promising technique for the rehabilitation of patients with agenesis of the upper lateral incisors, although studies with a larger number of patients and implants, and a longer follow up are needed.


Assuntos
Incisivo , Perda do Osso Alveolar , Implantação Dentária Endo-Óssea , Implantes Dentários , Seguimentos , Humanos , Projetos Piloto
20.
Oral Health Prev Dent ; 18(1): 719-729, 2020 Sep 04.
Artigo em Inglês | MEDLINE | ID: mdl-32895655

RESUMO

PURPOSE: This study investigated the progression of incisal tooth wear clinically for 4-years, using various diagnostic methods. Effectiveness of occlusal splints (night guards) for patients with nocturnal bruxism was also evaluated. MATERIALS AND METHODS: Forty maxillary incisors from 10 patients with nocturnal bruxism were selected. Group 1 (n=5) wore occlusal splints for 6 months, whereas group 2 (n=5) didn't. Ultrasound, cast-model analysis (control), digital radiography, FluoreCam and colorimeter were used for measurements. Clinical progression of incisal wear monitored at baseline, 3, 6, 12, 24 and 48 months, respectively. RESULTS: Ultrasound, cast-model analysis and FluoreCam readings gradually and statistically significantly decreased during the overall evaluation period for both groups (p<0.001). Regarding colorimeter, statistically significant differences in periodical measurements were observed from 24 months and 12 months, for group 1 and group 2, respectively (p<0.001). There were no statistically significant differences in readings at evaluation periods, between the groups, for ultrasound, digital radiography and cast-model analysis (p≥0.05); however, statistically significant differences were observed for colorimeter at 24 months (p=0.010) and 48 months (p<0.001), and for FluoreCam at 12, 24, 48 months (p<0.001). Annual decrease in mean crown length was determined as 20-30 µm for group 1 and 40-50 µm for group 2. The decreases in mean crown length were statistically significantly lower for group 1 compared to group 2, regarding the assessments for 1 year, 2 years and 4 years (p<0.001). Positive and good correlations were observed between ultrasound, cast-model analysis and FluoreCam measurements (p<0.001). CONCLUSIONS: Ultrasound, FluoreCam and colorimeter showed promising results for monitoring any change and progression of incisal tooth wear clinically. Ultrasound might be considered as a quantitative, reliable and repeatable method. Precision of the measurements varied among the diagnostic methods used. Occlusal splints may have a potential preventive effect for progressive tooth wear.


Assuntos
Radiografia Dentária Digital , Desgaste dos Dentes , Humanos , Incisivo , Estudos Longitudinais , Placas Oclusais
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