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1.
Dental Press J Orthod ; 25(2): 86-102, 2020 03.
Artigo em Inglês | MEDLINE | ID: mdl-32490929

RESUMO

INTRODUCTION: A significant increase in the number of adults in search of orthodontic treatment has raised a new challenge for orthodontists: the need to interact with other specialties to achieve excellent results, particularly when dealing with smile aesthetics and facial balance. Several factors should be considered to respond to their demand: adequate tooth leveling and alignment, individual tooth proportions between adjacent teeth and their contralateral teeth, shape and natural appearance of each tooth and gingival architecture, which should all be in agreement with facial harmony. Maxillary or mandibular incisors congenitally missing or lost due to caries or trauma and tooth-size discrepancies (Bolton) are some of the important aesthetic challenges for an integrated orthodontic treatment. OBJECTIVES: This study describes cases that illustrate the clinical challenges of treating the anterior area, as well as the multidisciplinary strategies required for their resolution. CONCLUSION: The increasingly frequent multidisciplinary orthodontic treatments of complex cases seem to effectively maximize aesthetic and functional results using a combination of procedures conducted by specialists in related areas, such as Surgery, Prosthetics, Implantology, Restorative Dentistry and Periodontics.


Assuntos
Estética Dentária , Incisivo , Adulto , Humanos , Maxila , Ortodontistas , Sorriso
2.
J Contemp Dent Pract ; 21(4): 383-389, 2020 Apr 01.
Artigo em Inglês | MEDLINE | ID: mdl-32584273

RESUMO

AIM: This study aimed to investigate the influence of using dual-cure composite core materials for fiber post luting on the fracture resistance of endodontically treated maxillary central incisors. MATERIALS AND METHODS: Fifty sound and recently extracted maxillary central incisors were endodontically treated and distributed into five groups. In the control group, access cavities were restored with the composite resin. Experimental groups had the coronal structure trimmed 2 mm above the cementoenamel junction. Teeth were restored with fiber posts and different combinations of luting and core materials: RelyX Unicem for post luting and MultiCore for core buildup; MultiCore for post luting and core buildup; RelyX Unicem for post luting and LuxaCore for core buildup; or LuxaCore for post luting and core buildup. All teeth were restored with zirconium crowns and subjected to thermocycling (6000 cycles 5/55°C). Loading of the teeth was applied at 135° to the palatal surface, using a universal testing machine at a cross-speed of 0.5 mm/minute until failure. The mode of failure was analyzed under a digital microscope. RESULTS: The fracture resistance of the control group was significantly higher than the experimental groups (p < 0.05). There was no significant difference between the experimental groups (p > 0.05). All teeth demonstrated nonrestorable failures. CONCLUSION: With the presence of the ferrule effect and crown restoration, the selected materials for post luting and core buildup have no significant influence on the fracture resistance of the endodontically treated teeth. CLINICAL SIGNIFICANCE: The use of the same dual-cure composite core materials for fiber post luting and core buildup would simplify the clinical procedure without enhancement of the fracture resistance of the endodontically treated tooth.


Assuntos
Técnica para Retentor Intrarradicular , Fraturas dos Dentes , Dente não Vital , Resinas Compostas , Coroas , Falha de Restauração Dentária , Análise do Estresse Dentário , Humanos , Incisivo
3.
Eur J Paediatr Dent ; 21(2): 163-166, 2020 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-32567950

RESUMO

MIH is still a challenge in paediatric dentistry, due to the high sensitivity caused to the first permanent molars, that can greatly reduce the cooperation either for home oral hygiene or for in-office treatment. In this contest the use of ozone emphasises the ART technique (Atraumatic Restorative Treatment) and introduces modern "no aerosol" concept.


Assuntos
Tratamento Dentário Restaurador sem Trauma , Hipoplasia do Esmalte Dentário , Ozônio , Criança , Humanos , Incisivo , Dente Molar , Prevalência
4.
Int J Comput Dent ; 23(2): 119-128, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32555765

RESUMO

AIM: To compare the accuracy and effort of digital workflow for guided endodontic access (GEA) procedures using two different software applications in 3D-printed teeth modeled to simulate pulp canal obliteration (PCO) in vitro. MATERIALS AND METHODS: 32 3D-printed incisors with simulated PCO were fabricated and mounted, four each on maxillary and mandibular study arches. Cone beam computed tomography (CBCT) and 3D surface scans were matched and used to virtually plan and prepare GEA by one operator using two different methods: 1) CoDiagnostiX (CDX; Dental Wings) with 3D-printed templates, and 2) Sicat Endo (SE; Sicat) with subtractive CAD/CAM-manufactured templates. Postoperative CBCT and virtual planning data were superimposed for analysis. Accuracy was assessed by measuring the discrepancies between planned and prepared cavities at the tip of the bur (three spatial dimensions, 3D vector, angle). Virtual planning effort was defined as the time and number of computer clicks. A 95% confidence interval (CI) was computed for each sample. RESULTS: SE successfully located root canals for GEA in 16/16 cases (100%) and CDX in 15/16 cases (94%). SE resulted in less mean deviation at the tip of the bur with regard to distance in the labial-oral direction (0.12 mm), 3D vector (0.35 mm), and angle (0.68 degrees) compared with CDX (0.54 mm, 0.74 mm, 1.57 degrees, respectively; P < 0.001). CDX required less mean planning time and effort for each four-tooth arch (10 min 50 s, 107 clicks) than SE (20 min 28 s, 341 clicks; P < 0.05). CONCLUSIONS: Both methods enabled rapid drill path planning, a predictable GEA procedure, and the reliable location of root canals in teeth with PCO without perforation.


Assuntos
Endodontia , Fluxo de Trabalho , Tomografia Computadorizada de Feixe Cônico , Cavidade Pulpar , Humanos , Incisivo
5.
Int J Esthet Dent ; 15 Suppl 1: S14-S31, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32467932

RESUMO

In patients with missing maxillary anterior teeth, orthodontic space closure is an evidence-based, effective treatment option: probably the best if the goal is long-term periodontal health. Nowadays, this approach is possible in all malocclusions as the first step of an interdisciplinary approach, which aims not only at an optimum esthetic and functional result, but moreover at reducing the -invasiveness of the subsequent restorative treatment. Space closure should be considered the first alternative in growing patients and when the gingival margins are visible. This essay presents the rationale for space closure and provides clinical tips for interdisciplinary treatment planning and finishing.


Assuntos
Anodontia , Má Oclusão , Estética Dentária , Humanos , Incisivo , Fechamento de Espaço Ortodôntico
6.
Int J Esthet Dent ; 15 Suppl 1: S32-S45, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32467933

RESUMO

Bilateral or unilateral congenitally missing maxillary lateral incisors is a common clinical situation that requires an interdisciplinary approach. It is often complicated by the presence of narrower teeth. Occlusal, periodontal, and esthetic considerations will influence the decision to close the space for a canine-lateral substitution or to open the space for a prosthodontic replacement of the missing lateral incisor. The team should define the proper dental position to provide a stable occlusion and dental esthetics obtained with a minimally invasive preparation. The restorative approach should provide a long-term functional and esthetic solution in the transitional period from adolescence to adulthood, reversible for future possible interventions.


Assuntos
Anodontia , Estética Dentária , Adolescente , Adulto , Oclusão Dentária , Humanos , Incisivo , Maxila
7.
Int J Esthet Dent ; 15 Suppl 1: S88-S97, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32467939

RESUMO

It is common knowledge that dental implants should not be inserted in adolescents, before completion of skeletal growth, because they behave as ankylosed teeth and remain in a fixed position while the surrounding bone and teeth are still developing, with consequential worsening esthetic damage. However, there is growing evidence that this phenomenon may continue throughout life in a large number of adult patients, although with a great variability in onset, progression, and extent. Infraocclusion and interproximal contact loss are the more common complications, and the majority of clinically significant cases are located in the anterior maxilla. The esthetic impact is mostly minimal, but in some cases the patient's smile may be severely compromised. Therefore, adult patients need to be informed when dental implants are considered to replace anterior missing teeth.


Assuntos
Perda do Osso Alveolar , Implantes Dentários para Um Único Dente , Adolescente , Adulto , Implantação Dentária Endo-Óssea , Estética Dentária , Humanos , Incisivo , Maxila , Erupção Dentária
8.
Int J Esthet Dent ; 15(2): 184-194, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32467947

RESUMO

BACKGROUND: Gingival tissue circumforaneous to the maxillary anterior teeth has been known to play a crucial role in smile esthetics. Reports in the literature suggest that both tooth and gingival display in the premolar areas are relevant for a beautiful smile. The present study examines the amount of tooth and gingiva exhibited in relation to the gingival smile line (GSL) and the interdental smile line (ISL). MATERIALS AND METHODS: The study population comprised 120 periodontally healthy patients within an age range of 20 to 40 years who were equally divided into two groups based on gender. The gingival zenith position (GZP), gingival zenith level (GZL), presence or absence of interdental papillae, GSL, and ISL were determined for the maxillary anterior teeth up to the second premolars. RESULTS: The mean GZL for the second premolars was found to be highest, followed by that for the first premolars and the lateral incisors. The GZL for female patients was slightly higher than that for males. The difference between the GZL for the first and second premolars in both the males and females was statistically significant (P < 0.0001). The majority of participants - 36 (60%) of the males and 33 (55%) of the females - displayed first premolars, whereas both the premolars were visible in 18 (30%) males and 22 (36%) of the females. CONCLUSIONS: Within the smile corridor, the majority of participants exhibited tooth and gingival display in the maxillary anterior teeth and premolar region. The GZL was greatest for the second premolars and smallest for the lateral incisors, indicating a considerable amount of gingival tissue display during smile for both GSL and ISL.


Assuntos
Estética Dentária , Gengiva , Adulto , Dente Pré-Molar , Feminino , Humanos , Incisivo , Masculino , Maxila , Sorriso , Adulto Jovem
9.
J Contemp Dent Pract ; 21(2): 207-210, 2020 Feb 01.
Artigo em Inglês | MEDLINE | ID: mdl-32381829

RESUMO

AIM: The aim of the study was to quantify the specific spatial displacement of gingival zenith (GZ) and determine a representative value for the interdental papilla height as a percentage ratio of clinical crown length (CL), as measured from GZ in the maxillary anterior dentition. MATERIALS AND METHODS: A total of 100 subjects and 1,200 interdental papillae were included. Eighty percent of the population presented with the gingival margin of lateral incisor (LI) teeth positioned coronally to the GZ of the ipsilateral canine (C) and central incisor (CI). RESULTS: No significant difference was found between mesial and distal papilla proportion (DPP) of maxillary incisor groups. In the C group, numerical values showed higher DPP. CONCLUSION: The data achieved provide the ideal numerical values for prosthetic, restorative, periodontal, implant, postorthodontic, and esthetic treatment outcomes. CLINICAL SIGNIFICANCE: The study describes the importance of quantifying the ideal numerical values for prosthetic, restorative, periodontal, implant, postorthodontic, and esthetic treatment outcomes. The readers should understand to quantify the specific spatial displacement of GZ and determine a representative value for the interdental papilla height as a percentage ratio of clinical CL, as measured from GZ in the maxillary anterior dentition.


Assuntos
Estética Dentária , Gengiva , Estética , Incisivo , Maxila
10.
Swiss Dent J ; 130(5): 397-406, 2020 May 11.
Artigo em Alemão | MEDLINE | ID: mdl-32390410

RESUMO

In the prosthetic treatment planning there is an important question either you will have an surgery procedure or you will solve the requirement with a conventional treatment. It requires the discussion with the patient of all different parameters like risk factors in the pink - and white esthetic, condition of the adjacent teeth, outcome, long-term stability, costs, etc. In consideration of all facts a decision must be made of which adequate therapy is feasible. In this case on request of the patient the missing right central incisor will be replaced with a new zirconia-layered ceramicbridge. The article describes the approach in detailed steps how to manage in an easy conservative way the pontic area and how to create an esthetic outcome. Therefore the author manufactured different kind of temporaries and reconfigure them. After the stabilization of the desired result the situation can be transferred in the definitive zirconia framework-design. Final it is the responsibility of the dental technician to get the right colour and more important the right shape of the teeth for an esthetic result.


Assuntos
Estética Dentária , Incisivo , Prótese Parcial Fixa , Humanos
11.
J Adhes Dent ; 22(3): 249-254, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32435765

RESUMO

PURPOSE: The management of complicated crown-root fractures is challenging for endodontic restoration. The present case describes a patient who sustained trauma to the maxillary right central incisor. MATERIALS AND METHODS: Clinical and radiographic examination showed a complicated crown-root fracture and incomplete root development with periapical radiolucency and inadequate endodontic treatment with overfilling. Orthograde retreatment with MTA apical closure combined with a microsurgical approach to remove of extruded material was performed. Coronal sealing was accomplished with a direct adhesive restoration and marginal relocation. RESULTS: A 5-year follow-up showed complete healing of the periapical lesion and correct preservation of function and esthetic parameters. CONCLUSION: A modern minimally invasive treatment protocol allows the maximum conservation of residual dental tissues.


Assuntos
Incisivo , Fraturas dos Dentes , Seguimentos , Humanos
12.
Indian J Dent Res ; 31(2): 175-179, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32436893

RESUMO

Aims: To calculate the relative distance between the incisive canal and maxillary central incisors using cone beam computed tomography (CBCT) and utilize the results in treatment planning in a clinical setting. Methods and Materials: A retrospective study was conducted on CBCT taken for other purposes in the Oral and Maxillofacial Radiology Department. All the quantitative measurements were performed between the incisive canal and both maxillary central incisors using CBCT on 61 subjects. The anterior-posterior measurements were taken on both sides and the average of both values was considered for the statistical analysis. All the linear measurements were performed on the axial plane at three different vertical reference points located on the sagittal plane. Statistical Analysis: The interexaminer reliability was tested by interclass correlation coefficient using two-way mixed and absolute agreement model. The comparison of linear measurement among each level was done by "Repeated measure ANOVA" and contrast method was used for pair-wise comparison when repeated measure analysis of variance (ANOVA) was significant. Results: The average anterior-posterior distance between the maxillary central incisor roots and the incisive canal measured was approximately 5-6 mm. The incisive canal width increases from the root apex level of maxillary central incisors (P3) to the oral opening level of the incisive canal (P1). Conclusions: The results of our study could be helpful in a clinical setting requires significant retraction of maxillary incisors or implant placement in maxillary anterior region.


Assuntos
Incisivo , Maxila , Tomografia Computadorizada de Feixe Cônico , Reprodutibilidade dos Testes , Estudos Retrospectivos
13.
Indian J Dent Res ; 31(2): 236-240, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32436903

RESUMO

Aims: Considering new ceramic systems, doubts about the appropriate combination of ceramics and cement are common. Settings and Design: To evaluate the influence of the elastic modulus (E) of cement agents associated with different indirect veneers on the stress distribution using finite element analysis. Methods and Materials: The finite element analysis was applied to evaluate the stress distribution on the structures. For that, a computer-aided design software was used for a three-dimensional (3D) modeling of an upper central incisor with preparation for an indirect veneer. The model was imported into the analysis software in STEP (Standard for Exchange of Product data) format. Tetrahedral elements formed the mesh. Solids were considered isotropic, linearly elastic, homogeneous, and with ideal contacts. Load application (100N, 45°) occurred on the lingual face. Cement agents have their E classified as low, intermediate, and high. The ceramic materials used were a hybrid ceramic, a zirconia reinforced lithium silicate and a lithium disilicate. Results: It was observed that none of the factors significantly influenced the stress concentration in dentine. Groups with high E cementing agent showed the highest stress peaks. The E of restorative material was significant for the stress generated in the veneer, and groups with hybrid ceramic presented more homogeneous stress results. Conclusions: The higher E of the cement agent and the ceramic, the higher the stress concentration, suggesting that hybrid ceramic associated with low elastic modulus resinous cement has superior biomechanical behavior.


Assuntos
Porcelana Dentária , Incisivo , Cerâmica , Cimentos Dentários , Materiais Dentários , Análise do Estresse Dentário , Análise de Elementos Finitos , Teste de Materiais , Estresse Mecânico
14.
J Clin Pediatr Dent ; 44(2): 112-115, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32271657

RESUMO

The present case report describes a rare case of dens evaginatus on the labial surface of mandibular incisor and interdisciplinary management including endodontic and periodontal treatment. A 10-year-old girl presented unusual whitish tubercle-like structure penetrated through the buccal gingiva of mandibular later incisor. In cone-beam computed tomographic view, pulpal tissue was extended from the principal root to the tubercle. Following full thickness flap reflection, the tubercle was carefully removed, resulting in dentin and pin-point pulp exposure. In order to prevent pulp necrosis and facilitate periodontal attachment to this area, Biodentine and enamel matrix derivative were applied. Gingival defect was compensated using a collagen matrix. Up to 2 years, harmonious gingiva state and no loss of tooth vitality were observed. In summary, dens evaginatus on mandibular later incisor could be successfully treated by means of interdisciplinary approach.


Assuntos
Necrose da Polpa Dentária , Incisivo , Criança , Tomografia Computadorizada de Feixe Cônico , Esmalte Dentário , Dentina , Feminino , Humanos
15.
J Clin Pediatr Dent ; 44(2): 123-126, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32271662

RESUMO

A modified pontic technique is presented that simplifies the management of patients with missing anterior teeth during the course of comprehensive orthodontic care. This technique demonstrates a lingual arch attached to lingual sheaths with the pontic placed on the lingual arch. Information presented includes appliance design, improved bond strength of the bracket on the pontic tooth, preparing the appliance for use as anchorage, and the incorporation of an anterior biteplate in the appliance. A modified pontic appliance improves esthetics and function when treating patients with missing maxillary anterior teeth.


Assuntos
Incisivo , Procedimentos de Ancoragem Ortodôntica , Prótese Parcial Fixa , Estética Dentária , Humanos , Desenho de Aparelho Ortodôntico , Fios Ortodônticos , Técnicas de Movimentação Dentária
16.
J Oral Sci ; 62(2): 180-183, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32224571

RESUMO

This study aimed to evaluate the prevalence of internal symmetry (the number and morphology of root canals) in the mandibular incisors using cone beam computed tomography (CBCT). A total of 302 CBCT scans involving 1,208 mandibular incisors were evaluated using the Vertucci's classification regarding the number and configuration of root canals. The central mandibular incisors exhibited two root canals in 22.6% of patients and lateral incisors in 24.3% of patients. Most teeth (76.4%) had a type I configuration (a single root canal, 1-1), 21.7% had type II (2-1), 1.1% had type V (1-2), and 0.8% had type IV (2-2). Teeth with a type-III configuration (1-2-1) were not found. In total, 17.5% of patients had a symmetric appearance of the two-canalled central mandibular incisors and 20.5% had a bilateral appearance of the two-canal lateral incisors. Moreover, in 12.3% of the patients, all four incisors showed two root canals. The highest degree of symmetry was found in incisors that had one root canal (central incisors: 217 of 302, lateral incisors: 229 of 302), followed by type 2-1 incisors (central incisors 50, lateral incisors 58). The influence of sex and age on the prevalence of symmetries was not significant. Concluding, the internal anatomy of the mandibular incisors cannot not be sufficiently predicted from the root canal anatomy of the contralateral tooth. Thorough clinical and radiographic inspection of each tooth remains mandatory to address the internal anatomy of the mandibular incisors correctly.


Assuntos
Cavidade Pulpar , Incisivo , Tomografia Computadorizada de Feixe Cônico , Humanos , Mandíbula , Raiz Dentária
17.
J Med Life ; 13(1): 56-63, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32341702

RESUMO

Our aim was to evaluate the location of impacted canines and their proximity to the lateral and central incisor to assess the prognosis of the impacted canine and compare the reliability of 2D versus 3D imaging solutions. We carried a prospective study on 17 subjects with impacted maxillary canines. Later, the patients underwent radiologic examination, i.e., sectional computed tomography and orthopantomography. The obtained records were compared regarding the location of the impacted maxillary canine, the proximity and resorption of the impacted canine to the lateral and central incisors, the prognosis of the impacted canine, and the linear distance of the canine from the vertical and horizontal reference lines drawn. Eleven males (45.8%) and 13 females (54.1%), 11 (45.8%) impacted canines on the right side, and 13 (54.1%) on the left side, as well as 2 (8.3%) transpositions, were noted. Buccally impacted teeth caused less resorption of the adjacent teeth. Among the 24 teeth examined using orthopantomography with the sector method, 3 (12.5%) teeth were found in sector 1. There were 8 (33.33%) teeth in sector 2, and 11 (45.8%) of the impacted canines were in sector 3. In localizing impacted maxillary canines, computed tomography revealed an increased accuracy of 31% compared to orthopantomography. Even though both computed tomography and orthopantomography revealed similar records, computed tomography showed more accuracy, also having an added advantage of its 3D viewing capabilities in precise localization of the impacted maxillary canine.


Assuntos
Incisivo/diagnóstico por imagem , Radiografia Panorâmica , Tomografia Computadorizada por Raios X , Dente Impactado/diagnóstico por imagem , Dente Canino/diagnóstico por imagem , Feminino , Humanos , Imageamento Tridimensional , Masculino , Estudos Prospectivos , Reprodutibilidade dos Testes
18.
Pediatr Dent ; 42(2): 134-140, 2020 Mar 15.
Artigo em Inglês | MEDLINE | ID: mdl-32276681

RESUMO

Purpose: The purpose of this case-control study was to investigate the relationship between molar-incisor hypomineralization (MIH) and pre-, peri-, and postnatal conditions of children and mothers in South Korea. Methods: The Korean Academy of Pediatric Dentistry con- ducted this study to examine factors associated with MIH among six- to 13-year-olds. The European Academy of Pediatric Dentistry criteria and self-administered questionnaires associated with MIH were used. Results: In multivariable logistic regression analysis, the odds ratio (OR) of MIH for children whose mothers used health supplements during pregnancy was 0.65 (P=0.009). Also, children with more than three hours of out- door activities per day tended to have a lower MIH (P=0.03) than did those with zero hours of outdoor activity. Additionally, the OR of MIH for children whose mothers smoked during pregnancy was 2.37 (P=0.019) and the MIH found to be 1.33 times more frequent in children with respiratory infections during the first three years of life (P=0.048). Conclusions: Maternal smoking during pregnancy and child's pediatric respiratory infection suffered within three years after birth are factors associated with the MIH among Korean children. Further study is needed because the prevalence of MIH in children whose mothers taking health supplements (vitamins or folic acid or iron) during pregnancy is low.


Assuntos
Hipoplasia do Esmalte Dentário , Incisivo , Estudos de Casos e Controles , Criança , Feminino , Humanos , Dente Molar , Gravidez , Prevalência
19.
Pediatr Dent ; 42(2): 146-149, 2020 Mar 15.
Artigo em Inglês | MEDLINE | ID: mdl-32276683

RESUMO

Developmental defects of enamel (DDE) in children range from moderate to severe and may predispose to dental fractures and early childhood caries. The prevalence of DDE in the primary dentition range from 24 to 75 percent, and the right time to diagnose DDE should be as soon as the teeth erupt. However, early detection of DDE in primary incisors is difficult because parents seldom visit the dentist at this age and, later on, caries lesions mask the original alteration. The purpose of this paper was to present three cases of unique and similar dental defects appearing in very young children from different countries-defects that probably share the same etiology. Given the severity of the defects and the children's' age, these could be the first reported cases of preeruptive intracoronal resorption (PEIR) in primary incisors. This paper also discusses the differentiation between DDE and PEIR.


Assuntos
Cárie Dentária , Hipoplasia do Esmalte Dentário , Criança , Pré-Escolar , Esmalte Dentário , Humanos , Incisivo , Prevalência , Dente Decíduo
20.
Int J Prosthodont ; 33(3): 321-327, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32320186

RESUMO

PURPOSE: To assess the influence of ferrule thickness on the fracture resistance and failure mode of endodontically treated bovine incisors and to predict the long-term prognosis, as well as choose the most suitable clinical treatment, for teeth with different ferrule thicknesses. MATERIALS AND METHODS: A total of 50 endodontically treated bovine incisors were restored with quartz fiber posts and metal crowns and separated into five groups (n = 10 each): no ferrule (group A); 0.5-mm-thick ferrule (group B); 1.0-mm-thick ferrule (group C); 1.5-mm-thick ferrule (group D); and 2.0-mm-thick ferrule (group E). All specimens were subjected to a fatigue loading test (2.33 Hz, 50 N, 300,000 cycles). Survived specimens were loaded until fracture on a universal testing machine at an angle of 135 degrees and a crosshead speed of 0.5 mm/minute. Failure modes and fracture resistance were recorded. Data were analyzed using one-way ANOVA and least significant difference tests. RESULTS: A significant increase (P < .05) was detected in fracture resistance with increase in ferrule thickness. Group D (1.5 mm) and group E (2.0 mm) showed significantly higher fracture resistance than the other three groups. All failures belonged to restorable fracture patterns. CONCLUSION: Ferrule thickness contributed significantly to the fracture resistance of endodontically treated bovine incisors restored with quartz fiber posts and metal crowns. Teeth with ferrule thickness of ≥ 1.5 mm can achieve higher fracture resistance and have a better long-term prognosis.


Assuntos
Técnica para Retentor Intrarradicular , Fraturas dos Dentes , Dente não Vital , Animais , Bovinos , Resinas Compostas , Coroas , Análise do Estresse Dentário , Incisivo , Metais
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