Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 4.016
Filtrar
1.
Prog Orthod ; 21(1): 36, 2020 Oct 01.
Artigo em Inglês | MEDLINE | ID: mdl-33000308

RESUMO

OBJECTIVE: To compare the accuracy of complete-arch scans and quadrant scans obtained using a direct chairside intraoral scanner. MATERIAL AND METHODS: Intraoral scans were obtained from 20 adults without missing teeth except for the third molar. Maxillary and mandibular complete-arch scans were carried out, and 4 quadrant scans for each arch were performed to obtain right posterior, right anterior, left anterior, and left posterior quadrant scans. Complete-arch scans and quadrant scans were compared with corresponding model scans using best-fit surface-based registration. Shell/shell deviations were computed for complete-arch scans and quadrant scans and compared between the complete-arch scans and each quadrant scans. In addition, shell/shell deviations were calculated also for each individual tooth in complete-arch scans to evaluate factors which influence the accuracy of intraoral scans. RESULTS: Complete-arch scans showed relatively greater errors (0.09 ~ 0.10 mm) when compared to quadrant scans (0.05 ~ 0.06 mm). The errors were greater in the maxillary scans than in the mandibular scans. The evaluation of errors for each tooth showed that the errors were greater in posterior teeth than in anterior teeth. Comparing the right and left errors, the right side posterior teeth showed a more substantial variance than the left side in the mandibular scans. CONCLUSION: The scanning accuracy has a difference between complete-arch scanning and quadrant scanning, particularly in the posterior teeth. Careful consideration is needed to avoid scanning inaccuracy for maxillary or mandibular complete-arch, particularly in the posterior area because a complete-arch scan might have potential error than a quadrant scan.


Assuntos
Anodontia , Mandíbula/diagnóstico por imagem , Adulto , Algoritmos , Humanos
3.
Am J Orthod Dentofacial Orthop ; 158(4): 587-598, 2020 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-32839074

RESUMO

A boy aged 8 years 11-months with 4 missing teeth in his mandibular arch and with a skeletal Class II pattern was treated with autotransplantation of developing premolars from his maxillary arch with the aid of temporary skeletal anchorage devices. The active treatment duration was 25 months. After treatment, he had a normal occlusion, and his profile was improved. Posttreatment records at 12 months showed stable occlusion and successfully autotransplanted premolars.


Assuntos
Anodontia , Perda de Dente , Autoenxertos , Dente Pré-Molar , Criança , Humanos , Masculino , Transplante Autólogo
4.
Oral Health Prev Dent ; 18(1): 271-275, 2020 Apr 01.
Artigo em Inglês | MEDLINE | ID: mdl-32618450

RESUMO

PURPOSE: The aim of this study was to assess the genetic evaluation of a three-generation consanguineous family with isolated oligodontia. MATERIALS AND METHODS: A 16-year-old male patient who had been referred for orthodontic treatment due to the presence of oligodontia, and his family members who presented several missing teeth had been enrolled in the study. Clinical and radiological assessments and genetic analysis including whole-exome sequencing were performed. RESULTS: Genetic evaluations revealed both homozygous and heterozygous mutations (c.T682A:p.F228I) in the WNT10A gene of six affected members of the family. Higher frequency of agenesis of mandibular second molar was found in homozygous relative to heterozygous WNT10A mutations. CONCLUSION: The present findings have provided evidence for a known variant in the WNT10A gene in a three-generation consanguineous family with isolated oligodontia, while the results confirmed that cases with homozygous mutation revealed clinical heterogeneity.


Assuntos
Anodontia , Adolescente , Humanos , Masculino , Mutação
5.
Niger J Clin Pract ; 23(6): 805-810, 2020 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-32525115

RESUMO

Background: Hypodontia and hyperdontia may occur with other dental anomalies such as microdontia, taurodontism, talon cusp, macrodontia and germination. Aims: The aim of this study to evaluate the relationship between hypodontia and hyperdontia with taurodontism, macrodontia and microdontia. Subjects and Methods: In this retrospective study, 2,348 Turkish patients aged 7 to 12 years and treated between 01.01.2017 and 01.01.2018 in Bahcelievler Oral and Dental Health Hospital were evaluated. Data were collected and differences in the distribution of hypodontia and hyperdontia including other dental anomalies were analysed. Results: Of the total sample of 2,348 patients, 1,126 (48%) were girls, 1,222 (52%) were boys. Hypodontia was found in 177 children (93 girls (53%), 84 boys (47%)). The prevalence of hypodontia and hyperdontia were 7.5% and 0.9%. Taurodontism is the most common dental anomalies in hypodontia patients (39%) followed by microdontia (10%). Taurodontism was more prevalent in girls (42%) than in boys (36.5%). Microdontia was found in 10 patients and macrodontia was observed in 9 hypodontia patients. Hyperdontia was found in 21 children [8 girls (38%), 13 boys (62%)]. The most common supernumerary tooth found was mesiodens (85%) and it's more prevalent in boys (67%) than in girls (33%). Taurodontism is the most common dental anomaly (48%) following macrodontia (19%) and were found to be much more prevalent in boys (53%) (23%) than in girls (37.5%) (12.5%). Microdontia was found in only 1 boy (%7.7) in hyperdontia patients. Conclusion: Hypodontia and hyperdontia with taurodontism, microdontia, and macrodontia need much more complex treatment plan. All cases should be evaluated using interdisciplinary approach for appropriate treatment choice. This helps in longterm and effective treatment planning according to a child's individual requirements.


Assuntos
Anodontia/epidemiologia , Cavidade Pulpar/anormalidades , Anormalidades Dentárias/epidemiologia , Dente Supranumerário/epidemiologia , Adolescente , Anodontia/diagnóstico por imagem , Criança , Pré-Escolar , Cavidade Pulpar/diagnóstico por imagem , Feminino , Humanos , Masculino , Saúde Bucal , Prevalência , Radiografia Panorâmica , Estudos Retrospectivos , Anormalidades Dentárias/diagnóstico por imagem , Dente Supranumerário/diagnóstico por imagem , Turquia/epidemiologia
6.
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
7.
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
8.
Int J Periodontics Restorative Dent ; 40(3): e111-e118, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32233191

RESUMO

Agenesis of the permanent dentition is rare. This report describes a 20-year-old woman with 19 deciduous teeth, a single permanent mandibular premolar, and other physical traits associated with ectodermal dysplasia. The patient demonstrated esthetic parameters associated with maxillomandibular alveolar insufficiency, and her chief complaints were directed toward esthetics and the potential impact of restorative choices on function. Three typical options for restoration include overdentures, removable partial dentures, or implant-supported prostheses replacing her natural dentition. This report illustrates a fully integrated digital approach to treatment planning, the fabrication of a computer-aided design/computer-assisted manufacture surgical guide and provisional restoration, guided implant placement, and definitive restoration using monolithic zirconia implant-supported fixed dental prostheses. The lifelong management of this rehabilitation is an acknowledged challenge.


Assuntos
Anodontia , Prótese Parcial Removível , Adulto , Prótese Dentária Fixada por Implante , Dentição Permanente , Revestimento de Dentadura , Feminino , Humanos , Adulto Jovem
9.
Prog Orthod ; 21(1): 9, 2020 Apr 06.
Artigo em Inglês | MEDLINE | ID: mdl-32249341

RESUMO

BACKGROUND: The aim of the present study was to assess if genetic polymorphisms in tooth agenesis (TA)-related genes are associated with craniofacial morphological patterns. METHODS: This cross-sectional, multi-center, genetic study evaluated 594 orthodontic Brazilians patients. The presence or absence of TA was determined by analysis of panoramic radiography. The patients were classified according to their skeletal malocclusion and facial growth pattern by means of digital cephalometric analysis. Genomic DNA was extracted from squamous epithelial cells of buccal mucosa and genetic polymorphisms in MSX1 (rs1042484), PAX9 (rs8004560), TGF-α (rs2902345), FGF3 (rs1893047), FGF10 (rs900379), and FGF13 (rs12838463, rs5931572, and rs5974804) were genotyped by polymerase chain reaction using TaqMan chemistry and end-point analysis. RESULTS: Genotypes (p = 0.038) and allele (p = 0.037) distributions for the FGF3 rs1893047 were significantly different according to the skeletal malocclusion. Carrying at least one G allele increased in more than two times the chance of presenting skeletal class III malocclusion (OR = 2.21, CI 95% = 1.14-4.32; p = 0.017). There was no association between another skeletal craniofacial pattern and some polymorphism assessed in the present study. CONCLUSION: Our results suggest that the genetic polymorphism rs1893047 in FGF3 might contribute to variations in the craniofacial sagittal pattern.


Assuntos
Anodontia , Má Oclusão , Brasil , Cefalometria , Estudos Transversais , Genótipo , Humanos
10.
Am J Orthod Dentofacial Orthop ; 157(4): 571-583.e16, 2020 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-32241364

RESUMO

Many treatment options are available to address the problem of missing second premolars. Extraction of retained deciduous second molars and subsequent space closure are often appropriate because this option alleviates the need for implants or other restorations. This article describes the conventional orthodontic closure of unilateral and bilateral congenitally missing second premolar spaces after the extraction of retained deciduous second molars.


Assuntos
Anodontia , Fechamento de Espaço Ortodôntico , Dente Pré-Molar , Humanos
11.
Niger J Clin Pract ; 23(3): 392-397, 2020 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-32134041

RESUMO

Background: Tooth agenesis is the congenital lack of one or more primary or permanent teeth and it is the most frequently seen dental anomaly. The prevalence of third molar agenesis is significantly higher than the agenesis of other teeth varying from 10% to 40% and shows geographical variance. Aims: The aim of this study was to investigate the prevalence of third molar agenesis and its association with other tooth agenesis of jaws. Subjects and Methods: A total of 594 Turkish subjects with or without agenesis of third molars (M3) were included in the study. Dental records and panoramic radiographs were evaluated for M3 agenesis, hypodontia and hyperdontia. Significant differences in the prevalence rate of M3 agenesis between genders among with evaluation of coexistence of M3 and other tooth agenesis were determined by Fisher's exact test. Results: The prevalence of M3 agenesis was determined as 28.7% with no statistically significant gender or location difference. Most common form of M3 agenesis involved one molar followed by two, four and three molars. Agenesis of other teeth was seen among both patient groups with and without M3 agenesis, without significant difference. Conclusions: Turkish population with M3 agenesis did not show increased prevalence of other tooth agenesis, indicating no association between occurrence of agenesis of other teeth and M3.


Assuntos
Anodontia/epidemiologia , Dente Serotino/anormalidades , Estudos Transversais , Humanos , Prevalência , Turquia/epidemiologia
12.
Niger J Clin Pract ; 23(3): 425-428, 2020 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-32134045

RESUMO

Congenital agenesis of lateral incisor is one of the most prevalent dental anomalies and is commonly treated by correcting the axes of maxillary central and canine teeth deviated toward the deficient area orthodontically, replacing the missing maxillary lateral incisor with dental implants and prosthetic restorations. Conducting treatment in interdisciplinary manner is the main criterion for the successful outcome. If this is ignored, clinicians may experience biological, mechanical or combined complications. As encountered in this case, bone resorption may occur if there is very limited bone-width or if there is a past of orthodontic treatment. In contemporary dentistry, this biological complication can be treated with the aid of a mixture including bovine bone graft material and advanced platelet-rich fibrin.


Assuntos
Anodontia/terapia , Incisivo , Fibrina Rica em Plaquetas , Transplante Ósseo , Humanos , Incisivo/anormalidades , Incisivo/cirurgia
13.
Acta Odontol Scand ; 78(6): 417-424, 2020 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-32125202

RESUMO

Objective: Dental anomalies occurring in deciduous teeth can affect the eruption of the permanent dentition and the occlusion stability. The occurrence of dental anomalies such as double teeth during the primary dentition in the daily practice might be frequent. The study aimed to qualitatively summarize the therapeutic management of double teeth in primary incisors.Material and Methods: A systematic review regarding the therapy of primary fused incisors in the mandible was performed and the obtained data were assessed according to Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines. The following electronic databases were screened from 1st January, 1996 until 30th July, 2019: PubMed, Scopus, EBSCO and the archives of paediatric dental journals. The search terms were grouped in anatomic entity: (tooth OR teeth OR incisor), pathological condition: (fused OR fusion OR geminated OR double), intervention: (treatment OR intervention OR therapy OR prevention OR control OR management OR restoration), observed parameters: (primary dentition OR primary tooth OR primary teeth).Results: Ten articles met all inclusion criteria. The data disclosed the occurrence of double teeth in mandibular incisors. The main management of this clinical condition is either preventive or surgical involving the extraction of fused teeth, based on the deciduous nature of the teeth, the degree of caries and malocclusion development risk.Conclusion: An early diagnosis of dental anomalies is fundamental for the application of proper preventive strategies to avoid a potential malocclusion in permanent dentition and to maintain these teeth sound and caries-free until the eruption of the permanent dentition.


Assuntos
Incisivo , Anodontia , Criança , Dentes Fusionados , Humanos , Mandíbula , Dente Decíduo
14.
Eur J Prosthodont Restor Dent ; 28(1): 43-52, 2020 Feb 27.
Artigo em Inglês | MEDLINE | ID: mdl-32036635

RESUMO

The aims of this study were as follows: 1) to retrospectively evaluate clinical situations of patients with congenitally missing permanent maxillary lateral incisors (CMPMLI) who were referred to three dental clinics specialised in prosthodontics over a 14-year period and 2) to investigate the factors affecting decision-making for patients with CMPMLI. The records of 46 patients with CMPMLI who were treated over a period of 14 years were examined to determine the mechanism of decision-making for treatment planning and factors affecting the decision. Descriptive statistics were used in the initial analysis of the entire data set. In addition, a correlation coefficient-the nonparametric Spearman's rho coefficient-was calculated to trace any possible relation between variables or rank orders. The significance level was set at 0.05 for the analysis. The results of this study revealed that decision-making for treatment of CMPMLI is directly dependent mainly on the following four factors: 1. Patient's age at treatment commencement 2. Individual characteristics of each clinical situation, which play a crucial but not an exclusive role in the treatment approach 3. Synthesis of the participating specialists in the treating team, which plays a crucial role in the decision-making 4. Use of pin-retained resin-bonded bridges (RBBs), either bilaterally attached or cantilevered, proved to be a reliable solution in terms of aesthetics, function and soft tissue response during the study period. Clinical implication: The rationale in the decision-making process for patients with congenitally missing permanent maxillary lateral incisors was investigated in this study to determine whether specific treatment options are superior to others.


Assuntos
Anodontia , Incisivo , Humanos , Maxila , Estudos Retrospectivos , Técnicas de Movimentação Dentária
15.
Am J Orthod Dentofacial Orthop ; 157(2): 212-217, 2020 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-32005473

RESUMO

INTRODUCTION: This study aimed to investigate the association between root morphology of maxillary incisors and nonsyndromic tooth agenesis in patients compared with a control group without agenesis. METHODS: This controlled cross-sectional pilot study (1:4) was performed with a random sample of 335 records from Brazilian applicants for orthodontic treatment, paired by sex and age. Panoramic and periapical radiographs were analyzed to diagnose tooth agenesis and to assess root morphology. The agenesis group (n = 67) included patients with nonsyndromic tooth agenesis, and the control group (n = 268) included patients without tooth agenesis. The statistical analysis included the Student t test and z test, conditional logistic regression, and odds ratio estimates. RESULTS: Occurrence of root morphological changes was significantly higher among patients with agenesis (P <0.05). Significant morphological changes (short, blunt, apically bent, and pipette-shaped roots) were found in the roots of remaining teeth when comparing agenesis and control groups (P <0.05). Patients with agenesis were more likely to show root morphological changes (odds ratio, 74.23; 95% confidence interval, 16.93-325.46; P <0.001). CONCLUSION: Patients with agenesis are more likely to present root morphological changes, which should be considered to minimize problems during orthodontic treatments.


Assuntos
Anodontia , Incisivo , Raiz Dentária , Anodontia/diagnóstico por imagem , Brasil , Estudos Transversais , Humanos , Incisivo/diagnóstico por imagem , Maxila , Projetos Piloto , Radiografia Panorâmica , Raiz Dentária/diagnóstico por imagem
16.
PLoS One ; 15(1): e0227287, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-31914153

RESUMO

Tooth agenesis is one of the most common developmental anomalies in humans and can affect dental occlusion and speech pronunciation. Research has identified an association between mutations in MSX1, PAX9, EDA, AXIN2, WNT10A, WNT10B and LRP6 and human tooth agenesis. Two unrelated individuals with non-syndromic tooth agenesis and their families were enrolled in this study. Using Sanger sequencing of the candidate genes, we identified two novel mutations: a missense mutation c.572 T>C and a frameshift mutation c.590_594 dup TGTCC, which were both detected in the homeodomain of MSX1. After identifying the mutations, structural modeling and bioinformatics analysis were used to predict the resulting conformational changes in the MSX1 homeodomain. Combined with 3D-structural analysis of other MSX1 mutations, we propose that there is a correlation between the observed phenotypes and alterations in hydrogen bond formation, thereby potentially affecting protein binding.


Assuntos
Anodontia/genética , Fator de Transcrição MSX1/genética , Adolescente , Análise Mutacional de DNA , Feminino , Mutação da Fase de Leitura , Humanos , Fator de Transcrição MSX1/química , Masculino , Modelos Estruturais , Mutação de Sentido Incorreto , Linhagem , Conformação Proteica em alfa-Hélice/genética , Domínios Proteicos/genética , Adulto Jovem
17.
Orthod Craniofac Res ; 23(1): 16-26, 2020 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-31608577

RESUMO

OBJECTIVE:  To provide an overview on the prevalence and types of dental anomalies in patients with craniofacial microsomia (CFM). Eligibility criteria: Inclusion criteria were CFM and dental anomalies. The following data were extracted: number of patients, methodology, mean age, sex, affected side, severity of mandibular hypoplasia, dentition stage and dental anomalies. INFORMATION SOURCES: Cochrane, EMBASE, PubMed, MEDLINE Ovid, Web of Science, CINAHL EBSCOhost and Google Scholar, searched until the 30 August 2019. Risk of bias: The quality was examined with the OCEBM Levels of Evidence. INCLUDED STUDIES: In total, 13 papers were included: four retrospective cohort studies, four prospective cohort studies, four case-control studies and one case series. Synthesis of results: The studies reported information on dental agenesis, delayed dental development, tooth size anomalies, tooth morphology and other dental anomalies. Description of the effect: Dental anomalies are more often diagnosed in patients with CFM than in healthy controls and occur more often on the affected than on the non-affected side. Strengths and limitations of evidence: This is the first systematic review study on dental anomalies in CFM. However, most articles were of low quality. INTERPRETATION: Dental anomalies are common in CFM, which might be linked to the development of CFM. The pathophysiology of CFM is not entirely clear, and further research is needed.


Assuntos
Anodontia , Síndrome de Goldenhar , Humanos , Prevalência , Estudos Prospectivos , Estudos Retrospectivos
18.
Eur J Orthod ; 42(1): 8-14, 2020 Jan 27.
Artigo em Inglês | MEDLINE | ID: mdl-31579919

RESUMO

BACKGROUND: Children born with unilateral cleft lip and palate (UCLP) are reported to display several dental anomalies including agenesis, supernumeraries, as well as variations in dental size, shape, and path of eruption. The extensive sample of individuals with UCLP included in the Scandcleft randomized control trials offers the opportunity to study more rare conditions, which is seldom possible with limited samples. OBJECTIVES: The aim was to study dental anomalies at 8 years of age in children born with UCLP included in the Scandcleft randomized control trials. METHODS: Panoramic and intraoral radiographs from 425 individuals (279 males and 146 females) with a mean age of 8.1 years were assessed by four orthodontists regarding dental anomalies. RESULTS: Agenesis was found in 52.5 per cent and supernumerary teeth in 16.9 per cent of the participants. The cleft lateral was missing in 43.8 per cent and was found peg shaped in 44.7 per cent. The distribution of ectopic eruption was 14.6 per cent, mainly affecting maxillary first molars, while transposition was found in 3.4 per cent of the individuals. In addition, infraocclusion of one or several primary molars was registered in 7.2 per cent of the participants. CONCLUSION: We conclude that 8-year-old children born with UCLP display multiple dental anomalies. The Scandcleft sample allowed rarely studied conditions such as infraocclusion of primary molars and transposition to be studied in children born with UCLP. TRIAL REGISTRATION: ISRCTN29932826.


Assuntos
Anodontia , Fenda Labial , Fissura Palatina , Anodontia/diagnóstico por imagem , Anodontia/etiologia , Criança , Fenda Labial/complicações , Fenda Labial/cirurgia , Fissura Palatina/complicações , Fissura Palatina/cirurgia , Feminino , Humanos , Masculino , Radiografia Panorâmica , Ensaios Clínicos Controlados Aleatórios como Assunto
19.
Arch Oral Biol ; 109: 104556, 2020 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-31568994

RESUMO

OBJECTIVES: To investigate the association of MSX1 rs12532 polymorphism with the risk of nonsyndromic unilateral complete cleft lip and palate (NSCLP) and tooth agenesis. MATERIALS AND METHODS: The study is comprised of 384 individuals divided into 4 groups: group 1, patients with unilateral complete NSCLP and premolar agenesis (n = 57); group 2, patients with unilateral NSCLP without tooth agenesis (n = 117); group 3, patients with premolar agenesis without oral cleft (n = 53) and group 4 (n = 157), a control group with individuals without tooth agenesis and oral cleft. Genotyping of rs12532 was carried out with Taqman chemistry, and associations were investigated using logistic regression analyses. RESULTS: Overall rs12532 allele and genotype distributions revealed no significant differences between the groups of NSCLP or tooth agenesis. CONCLUSION: Although our results are consistent with a lack of association of MSX1 rs12532 and the risk of unilateral NSCLP and tooth agenesis, further studies with additional SNPs and a more diverse ethnic cohort are warranted.


Assuntos
Fenda Labial/genética , Fissura Palatina/genética , Fator de Transcrição MSX1/genética , Adolescente , Adulto , Alelos , Anodontia , Estudos de Casos e Controles , Criança , Feminino , Humanos , Masculino , Polimorfismo de Nucleotídeo Único , Adulto Jovem
20.
Arch Oral Biol ; 111: 104629, 2020 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-31865033

RESUMO

OBJECTIVE: This study aimed to suggest criteria for the early diagnosis of agenesis of the maxillary second premolars (U5) based on the developmental stages of the maxillary canines (U3), first premolars (U4), and second molars (U7). DESIGN: Overall, 303 control patients and 72 patients with agenesis who met the inclusion criteria were analyzed among 5136 patients aged 5-11 years for whom panoramic radiographs were obtained at Seoul National University Dental Hospital from June 2008 to December 2009. All developmental stages of U3, U4, U5, and U7 in both groups were evaluated and categorized into the stages proposed by Demirjian et al. To confirm the delayed dental development in the agenesis group, the Wilcoxon rank sum test was used. For verifying the tooth with the most similar developmental pattern to U5, the Kendall tau Rank Correlation and Bootstrap methods were used. Moreover, survival analysis and leave-one-out-cross-validation were performed to identify the earliest developmental stages of U3, U4, and U7 at which agenesis of U5 can be confirmed. RESULTS: The developmental stage of U4 in the agenesis group was significantly delayed compared with that in the control group at ages 5-10. All of the stages of U3, U4, and U7 showed high correlation coefficients with U5. CONCLUSION: U5 agenesis can be confirmed with high prediction accuracy when at least two of the three conditions are satisfied: U3, U4, and U7 in Demirjian stages E, D, and C, respectively.


Assuntos
Dente Molar , Anodontia , Dente Pré-Molar , Criança , Pré-Escolar , Humanos , Radiografia Panorâmica
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA