Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 5.513
Filtrar
1.
J Clin Pediatr Dent ; 45(1): 54-57, 2021 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-33690829

RESUMO

OBJECTIVES: This study examines how accurate pediatric dentists are at estimating dental arch lengths by comparing their model estimations (guesstimating the arch length without measuring) to the Tanaka and Johnston mixed dentition arch length analysis. STUDY DESIGN: This study consisted of two parts, a survey of practitioners and a model estimating and measuring component. The survey was designed and given to 44 pediatric dentists to determine how many were practicing orthodontics and using arch length analyses routinely. Then 18 pediatric dentists and 13 pediatric dental residents examined 20 sets of mixed dentition models and estimated how much space was available. These estimations were compared to the calculated gold standard, the Tanaka and Johnston arch length analysis of the same models. RESULTS AND CONCLUSIONS: More than half of the dentists surveyed that practice comprehensive orthodontics use arch length estimates. Pediatric dentists and pediatric dental residents are just as good as each other at estimating arch length. Pediatric dentists and pediatric dental residents underestimated arch length by -3.6 and -3.1 mm, respectively. More research needs to be done to determine if model estimation is a clinically acceptable way to judge arch length.


Assuntos
Dentição Mista , Ortodontia , Dente Pré-Molar , Criança , Arco Dental , Humanos , Odontometria
2.
Am J Orthod Dentofacial Orthop ; 159(2): e169-e177, 2021 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-33546831

RESUMO

INTRODUCTION: The present study aimed to analyze possible factors involved in irreversible (IRR) ectopic eruption (EE) of the first permanent molar and explore potential predictors for the IRR outcome. METHODS: Children aged 4-11 years, with at least 1 EE and who took their first panoramic radiograph before the age of 8 years, were selected in this study. The subjects were assigned to the self-correcting (SC) and IRR groups. Patients' age, sex, distribution of EE, and accompanying dental anomalies were recorded. Eruptive angulation (EA) of the first permanent molar, the grade of root resorption in the second deciduous molar, the magnitude of impaction index (MOII), and horizontal distance were measured on the panoramic radiographs. Chi-square tests and independent-sample t test were used for nominal and continuous variables, respectively. The receiver operative characteristic curve was used to determine the critical value. RESULTS: A total of 406 children with 634 first permanent molars, presenting EE, were enrolled, with 61.3% of the teeth in the SC group. Sex of children with EE and distribution of EE were not relevant to the IRR outcome. The presence of supernumerary teeth might be a protective factor for the IRR outcome. The increasing severity of root resorption in the second primary molar indicated an IRR outcome. A higher MOII and a larger EA suggested an IRR outcome with moderate-to-high quality. The horizontal distance exhibited debatable results, with a low predictive quality. CONCLUSION: Close monitoring and early intervention would benefit children with increasing severity of distal atypical resorption in the second primary molar, higher MOII, and larger EA.


Assuntos
Erupção Ectópica de Dente , Criança , Pré-Escolar , Arco Dental , Humanos , Dente Molar/diagnóstico por imagem , Radiografia Panorâmica , Erupção Dentária , Erupção Ectópica de Dente/diagnóstico por imagem , Dente Decíduo
3.
Int J Prosthodont ; 34(1): 101-108, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-33570525

RESUMO

PURPOSE: To compare the accuracy of six intraoral scanners in two different partially edentulous maxillary models and to evaluate the effect of scanning sequence on accuracy. MATERIALS AND METHODS: Maxillary Kennedy Class I and Class IV situations were used as reference models. The reference datasets were obtained by scanning the models using a highly accurate industrial scanner (ATOS Core 80, GOM). The following six intraoral scanners were evaluated: Trios 3 (3Shape), iTero Element 2 (Align Technology), Emerald (Planmeca), CEREC Omnicam (Dentsply Sirona), CEREC Primescan (Dentsply Sirona), and Virtuo Vivo (Dental Wings). A total of 120 scans from both models were obtained using the six intraoral scanners and divided into two groups based on scanning sequence. Accuracy was evaluated by deviation analysis using 3D image processing software (Geomagic Studio 12, 3D Systems). Kruskal Wallis and Mann-Whitney U tests were performed (P ≤ .05) for statistical analysis. RESULTS: There were significant differences in the accuracy of digital impressions among intraoral scanners and scanning sequences. The trueness of the Trios scanner and the precision of the Trios, Primescan, and iTero scanners were significantly higher than for the other scanners. The Emerald had the lowest accuracy among the six intraoral scanners tested. Accuracy was affected by scanning sequence when using the Virtuo Vivo, Emerald, Primescan, and iTero. CONCLUSION: In Kennedy Class I and Class IV partially edentulous cases, it is useful to consider that the intraoral scanner used may affect the accuracy of the digital impression.


Assuntos
Técnica de Moldagem Odontológica , Modelos Dentários , Desenho Assistido por Computador , Arco Dental , Dentição , Imageamento Tridimensional
4.
Am J Orthod Dentofacial Orthop ; 159(2): 202-209.e2, 2021 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-33388198

RESUMO

INTRODUCTION: This study aimed to establish mathematical equations to describe the dental and basal arch forms in skeletal Class II malocclusion and to investigate correlations between these forms to facilitate clinical diagnosis and treatment design. METHODS: Cone-beam computed tomography images of 60 patients (30 each with skeletal Class II malocclusion and normal occlusion) were subjected to 3-dimensional volume rendering, image reconstruction, and measurement. Using a computer program written in Java on the Eclipse platform (Eclipse Foundation, Ottawa, Canada), a beta function was used to establish mathematical models of dental and basal bone arch forms, and model-fitting was performed. RESULTS: A mathematical model was developed to describe the dental and basal arch forms in skeletal Class II malocclusion. The maxillary and mandibular dental arch lengths were significantly longer in skeletal Class II malocclusion than in normal occlusion, whereas the width of the maxillary molar segment was smaller. The maxillary molar and mandibular intercranial segments in the basal arch were significantly longer in skeletal Class II malocclusion than in normal occlusion, whereas the mandibular intercranial segment width was smaller. CONCLUSIONS: The dental arch and basal bone arch forms in the maxilla and mandible follow individual curves, described by a beta function. In skeletal Class II malocclusion, the dental and basal arches are discrepant in horizontal and anteroposterior dimensions, which should be considered during orthodontic treatment planning to improve arch matching.


Assuntos
Arco Dental , Má Oclusão de Angle Classe II , Canadá , Cefalometria , Arco Dental/diagnóstico por imagem , Humanos , Má Oclusão de Angle Classe II/diagnóstico por imagem , Má Oclusão de Angle Classe II/terapia , Mandíbula/diagnóstico por imagem , Maxila/diagnóstico por imagem
5.
Angle Orthod ; 91(2): 178-186, 2021 03 01.
Artigo em Inglês | MEDLINE | ID: mdl-33434282

RESUMO

OBJECTIVES: To compare the effects of a hybrid miniscrew-supported expander versus a conventional Hyrax (CH) expander in growing patients. MATERIALS AND METHODS: Forty patients were randomized into two groups: a hybrid Hyrax (HH) expander group using a Hyrax expander with two miniscrews and a CH expander group. The final sample had 18 subjects (8 female, 10 male; initial age of 10.8 years) in the HH group and 14 subjects (6 female, 8 male; initial age of 11.4 years) in the CH group. Cone-beam computed tomography examinations and digital dental models were obtained before expansion and 11 months postexpansion. The primary outcomes included the orthopedic transverse effects of expansion. Intergroup comparison was performed using analysis of covariance (P < .05). RESULTS: Significantly greater increases in the nasal cavity width, maxillary width, and buccal alveolar crest width were found for the HH group. No intergroup differences were observed for dental arch width or shape changes. CONCLUSIONS: The HH group showed greater increases in the nasal cavity width, maxillary width, and buccal alveolar crest width. No differences were observed for intermolar, interpremolar, or intercanine widths; arch length; or arch perimeter. Arch size and shape showed similar changes in both groups.


Assuntos
Procaviídeos , Processo Alveolar , Animais , Criança , Tomografia Computadorizada de Feixe Cônico , Arco Dental , Feminino , Humanos , Masculino , Maxila , Técnica de Expansão Palatina
6.
J Clin Pediatr Dent ; 44(6): 459-463, 2020 Dec 01.
Artigo em Inglês | MEDLINE | ID: mdl-33378471

RESUMO

OBJECTIVE: The aim of this study was to evaluate changes in the mandibular dental arch and incisor alignment induced by combined bonded Rapid Maxillary Expansion (RME) and Face Mask (FM) therapy in the mixed dentition stage in which leeway space was used throughout the treatment. STUDY DESIGN: This retrospective study evaluates pretreatment (T0) and posttreatment (T1) cephalometric radiographs and orthodontic models of 25 patients (mean age: 10.75±2.64), in mixed dentition, having skeletal Class 3 anomaly (ANB<0) with maxillary retrognatism (SNA=77.2±0.68) and bilateral posterior crossbite treated with bonded Hyrax RME-FM. Mean treatment duration was 10.4 months. Dental model measurements were performed using the 3Shape OrthoAnalyzerTM 2013-1 program. Changes in the mandibular incisor and first molar positions were determined on cephalometric radiographs. Statistical evaluation was done with a paired t-test. RESULTS: A significant increase of 1.2 mm was found in intermolar width (p<0.001) in the mandibular dental arch. There was a significant decrease (1.4 mm) (p<0.001) in arch depth and an increase in arch length discrepancy (1.7mm)(p<0.01). There was a significant increase (0.8mm) (p<0.05) in the incisors' irregularity score (LII). IMPA showed a significant decrease (p<0.05). CONCLUSION: Clinicians should be aware that mandibular crowding tends to increase during this type of combined therapy.


Assuntos
Má Oclusão , Máscaras , Adolescente , Cefalometria , Criança , Arco Dental/diagnóstico por imagem , Dentição Mista , Humanos , Má Oclusão/terapia , Maxila , Técnica de Expansão Palatina , Estudos Retrospectivos
7.
Angle Orthod ; 90(4): 500-506, 2020 07 01.
Artigo em Inglês | MEDLINE | ID: mdl-33378499

RESUMO

OBJECTIVE: To assess and compare the effects produced in the maxillary dental arch by means of Connecticut intrusion arch (CIA) with or without a cinch back on the distal end of the tube of the first molars. MATERIALS AND METHODS: This study included 44 patients with a mean age of 13.1 ± 1.8 years treated for deep bite with a CIA randomly divided into two groups: group 1 (G1), 22 patients with initial mean age of 12.72 ± 1.74 years treated with the CIA in the upper arch without a cinch back on the distal surface of the tube of the first molars, and group 2 (G2), 22 patients with an initial mean age of 13.67 ± 2.03 years treated with the CIA with a cinch back. Lateral cephalograms were available before treatment (T1) and after intrusion of maxillary incisors (T2). The mean treatment period was 5.5 ± 1.45 months. Intragroup and intergroup changes in the maxillary incisor and molar positions were analyzed by paired and independent t-tests associated with the Holm-Bonferroni correction method for multiple comparisons (P < .05). RESULTS: There were significant differences between groups in terms of maxillary incisor displacement. The maxillary incisors flared labially (2.17°) and proclined (1.68 mm) in group 1, whereas a palatal inclination (-1.99°) and retroclination (-1.13 mm) was observed in group 2. No significant differences were found for the molar positions between the groups. CONCLUSIONS: The presence or absence of a distal bend in CIA affects incisor tipping and proclination during intrusion mechanics.


Assuntos
Arco Dental , Técnicas de Movimentação Dentária , Adolescente , Cefalometria , Criança , Connecticut , Arco Dental/diagnóstico por imagem , Humanos , Maxila , Estudos Prospectivos
8.
Angle Orthod ; 90(3): 397-404, 2020 05 01.
Artigo em Inglês | MEDLINE | ID: mdl-33378431

RESUMO

OBJECTIVE: To evaluate three-dimensional (3D) accuracy and reliability of nonradiographic dentofacial images integrated with a two-step method. METHODS: 3D facial images, cone-beam computed tomography (CBCT) images and digital maxillary dental casts were obtained from 20 pre-orthodontic subjects. Digital dental casts were integrated into 3D facial images using a two-step method based on the anterior tooth area. 3D coordinate values of five dental landmarks were identified in both dentofacial images and CBCT images. The accuracy of the integration method was assessed with paired t-tests between dentofacial images and CBCT-based reference standards. Intraclass correlation coefficients (ICCs) were assessed for the reliability of dentofacial images and CBCT-based images. Analysis of variance and Kruskal-Wallis tests evaluated the accuracy of the method in different dimensions. RESULTS: There was no statistical difference between dentofacial images and CBCT reference standards in both translational and rotational dimensions (P > .05). Translational mean absolute errors for full dentitions were within 0.42 mm and ICCs were over 0.998 in x, y, and z directions. Rotational mean absolute errors for full dentitions were within 0.92° and ICCs over 0.734 in pitch, yaw, and roll orientations. Integration errors were significantly greater in the first molar, z-translation, and pitch rotation (P < .05). CONCLUSIONS: Integrating 3D dentofacial images with the two-step method is precise and acceptable for clinical diagnostics and scientific purposes. Errors were greater in the molar region, z-translation, and pitch rotation.


Assuntos
Imageamento Tridimensional , Maxila , Tomografia Computadorizada de Feixe Cônico , Arco Dental , Humanos , Maxila/diagnóstico por imagem , Reprodutibilidade dos Testes
9.
Am J Orthod Dentofacial Orthop ; 158(6): 807-815, 2020 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-33012595

RESUMO

INTRODUCTION: Maintenance of the intercanine and intermolar distances reduces the risk of relapse and increases the chance of stability; these values represent the limits of the arch, resulting from the muscular balance of each patient. The ideal would be to reproduce the patient's arch form individually. The Ricketts pentamorphic arch forms allow the clinician to choose among 5 shapes, the one that best fits the patient's arch form. The objective of this study was to evaluate the effect of orthodontic treatment without extraction according to the pentamorphic arch forms on mandibular arches of different forms. METHODS: Fifty patients were included in the study. For each patient, the pretreatment and end-of-treatment models were scanned by 3Shape Trios (3Shape, Copenhagen, Denmark) and transferred to the OrthoAnalyzer software (3Shape) version 2017-11.7.1.3 for measurements and superimpositions. The following measurements were made on the mandibular arches for both initial and final digital models: arch depth; intercanine distance, the distance between the first premolars, the distance between the second premolars, the distance between the first molars, and the distance between the second molars. Three superimpositions were made: superimposition between the initial arch and the corresponding form of the pentamorphic arch forms, superimposition between the final arch and the corresponding form of the pentamorphic arch forms, and superimposition between the initial arch and the final arch. The largest difference between the superimposed arches in each region was measured. RESULTS: This study showed that intercanine distance (P = 0.236), the distance between the first premolars (P = 0.074), and the distance between the first molars (P = 0.616) did not significantly change after orthodontic treatment. In contrast, the distance between the second molars (P = 0.028) and the arch depth (P <0.001) increased significantly after orthodontic treatment. The mean of the largest difference in the absolute value of all the superimpositions is significantly different from the theoretical value 0 (P <0.001), but clinically, this difference is significant only in certain premolars and molars regions. CONCLUSIONS: This study has shown that the pentamorphic arch forms maintained the arch shape in the sagittal and transverse directions, except for an expansion of the distance between the mandibular second molars.


Assuntos
Arco Dental , Modelos Dentários , Dente Pré-Molar , Arco Dental/diagnóstico por imagem , Humanos , Mandíbula , Dente Molar , Software
10.
Zhonghua Kou Qiang Yi Xue Za Zhi ; 55(10): 737-742, 2020 Oct 09.
Artigo em Chinês | MEDLINE | ID: mdl-33045784

RESUMO

Objective: To explore the accuracy of occlusal contacts on digital model made by intraoral scanner. Methods: Twenty healthy subjects [6 males, 14 females, (24.4±1.4) years old] with intact dentition were randomly recruited from postgraduate students in Capital Medical University School of Stomatology who volunteered to participate in this study. For each participant, the 2nd and 3rd quadrant of natural dentition was scanned. A diagnostic test design was performed. The occlusal contacts of the maximal intercuspal position (MIP) were extracted with the transillumination of silicone interocclusal records, and the extraction threshold was set as ≤50 µm. Intraoral scanning system was used to scan in MIP and generate occlusal contacts on digital model. Five groups were designed as test groups according to included tooth position: group 1 (buccal scanning ranged from tooth 21 to 23), group 2 (buccal scanning ranged from tooth 23 to 26), group 3 (buccal scanning ranged from tooth 24 to 26), group 4 (buccal scanning ranged from tooth 25 to 26), group 5 (buccal scanning ranged from tooth 21 to 26). Five groups occlusal contacts on digital model were generated respectively. According to the relevant literature, the upper occlusal surface was divided into 28 partitions, and the accuracy of occlusal contacts on digital model was calculated with the transillumination of silicone interocclusal records as the reference standard. Subgroup analysis was performed according to anterior teeth area, premolars area and molars area. Results: The accuracy of occlusal contacts on digital models of the half dentition in five buccal scanning positions were: group 1 (86.8%), group 2 (92.0%), group 3 (90.7%), group 4 (91.1%), group 5 (90.4%), and the accuracy of occlusal contacts in group 1 was significantly lower than those in the other four groups (P<0.05). The accuracy of anterior teeth area were 85.6%-93.9%; the accuracy of premolar area were 92.5%-94.4%; the accuracy of molar area were 77.3%-93.6%, group 1 was significantly lower than those in the group 4 in molars area (P<0.05), the accuracy of anterior area was statistically less than premolars area and molars area in group 1 (P<0.05). There was no statistical difference in pairwise comparison between the three sections (P>0.05). Conclusions: The digital models scanned intraoral methods provide accurate, quantitative measures of occlusal contacts when transillumination contacts are the reference standard.


Assuntos
Oclusão Dentária , Testes Diagnósticos de Rotina , Adulto , Dente Pré-Molar , Arco Dental , Feminino , Humanos , Masculino , Dente Molar , Adulto Jovem
11.
Int J Oral Implantol (Berl) ; 13(3): 291-298, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32879933

RESUMO

AIMS: Immediate fixed full-arch implant-supported prosthetic rehabilitation of the severely atrophic maxilla is a challenging treatment modality with favourable patient interest. The delivery of the treatment is challenging due to the difficulty in providing adequate posterior implant positioning with high primary stability in the absence of alveolar bone distal to the maxillary lateral incisors. Current trends in posterior implant placement and immediate loading include the placement of zygomatic implants or distally tilted implants placed anterior to the sinus cavity. The development of an extended-length subcrestal angulated implant gives an additional option to provide posterior occlusal support for reconstruction of the severely atrophic maxilla with an immediate full-arch fixed prosthesis. MATERIALS AND METHODS: This article describes a trans-sinus nasal protocol for fixed full-arch rehabilitation in the severely atrophic maxilla when the residual alveolar bone does not extend distally from the permanent maxillary lateral incisors. The extended-length distally tilted implant transverses a simultaneously augmented sinus cavity and engages the anterior maxilla and bone of the lateral nasal wall. RESULTS: The placement of an extended-length distal tilted implant placed the implant head at the crest of the alveolar ridge in the first permanent molar position, promoting favourable prosthetic biomechanics for a full-arch fixed prosthesis. Passivity of fit of the fixed prosthesis was achieved due to the 24-degree subcrestal angulation feature of the implant and use of multi-unit abutments.


Assuntos
Implantes Dentários , Seios Paranasais , Arco Dental , Prótese Dentária Fixada por Implante , Humanos , Maxila
12.
Niger J Clin Pract ; 23(8): 1120-1126, 2020 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-32788490

RESUMO

Background: Dental arch dimensions are important considerations in orthodontic treatment planning and monitoring. Objective: This study aimed to compare the dental arch dimensions in wind and non-wind instrument players (WIP and non-WIP). Methods: This was a cross-sectional study which compared a group of 50 male subjects aged 18-45 years that had been playing wind instruments for a minimum of 2 years with a control group matched for age in the same environment. The arch dimensions were assessed for both groups by measuring their dental casts using a digital caliper. Data was analyzed using statistical Software Package for Social Sciences (SPSS Inc, Chicago, IL) version 17. Statistical significance level was set at P < 0.05. Results: The mean number of years of playing wind instrument among the WIP was 9.26 ± 6.21 years. All the maxillary arch dimensions were larger in the WIP group except for the palatal depth while the mandibular arch parameters in the non-WIP group were larger than the WIP group except the mandibular arch length. The differences were not statistically significant (P > 0.05). The mean maxillary inter-canine width (37.48 ± 1.12 mm), inter-molar width (57.27 ± 1.99 mm), arch length (29.80 ± 2.2.09 mm), and palatal depth (22.21 ± 2.33 mm) for class B instrument (Saxophone and clarinet) players were larger than either the class A instrument (Trumpet and trombone) players or the non-WIP group. These differences were not statistically significant (P > 0.05). Conclusions: Playing a wind instrument as well as the type of instrument played, duration, and frequency of play did not significantly affect dental arch dimensions.


Assuntos
Arco Dental/anatomia & histologia , Oclusão Dentária , Música , Adolescente , Adulto , Cefalometria , Estudos Transversais , Dente Canino , Feminino , Humanos , Masculino , Maxila , Pessoa de Meia-Idade , Ortodontia , Adulto Jovem
13.
Indian J Dent Res ; 31(3): 382-388, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32769271

RESUMO

Context: Anterior open bite is a complex condition involving a combination of various dental and skeletal components in three dimensions. The data on the differences and changes in the transverse relation in individuals with anterior open bite are limited. Aims: To assess the dental arch widths in individuals with anterior open bite using study casts and facial widths using frontal cephalogram and to compare these widths with that of individuals without anterior open bite. Materials and Methods: Eighty adults [40 with and 40 without anterior open bite, mean (standard deviation) age = 20.68 years] were selected. The study group was divided into skeletal (n = 19) and dental (n = 21) open bite groups according to Jarabak's ratio. Posteroanterior cephalograms and study casts were analyzed. Results: The mean width of zygomatic arch (112.18 mm) and condylar region (100.55 mm) in the control group was significantly higher (P < 0.05). The mean gonial width in the skeletal open bite group (81.143 mm) was significantly (P < 0.05) lesser than the dental open bite group (84.842). The maxillary intercanine width for the skeletal open bite group (36.48 mm) was significantly (P < 0.01) higher than that of the dental open bite group (34.26 mm). Conclusion: A transverse deficiency was seen in in the zygomatic and condylar regions in adults with anterior open bite. Individuals with a skeletal open bite showed a narrow gonial and wider maxillary intercanine width compared with individuals with dental open bite.


Assuntos
Mordida Aberta , Adulto , Cefalometria , Arco Dental , Humanos , Maxila , Radiografia , Zigoma
14.
Am J Orthod Dentofacial Orthop ; 158(4): 572-578, 2020 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-32828610

RESUMO

INTRODUCTION: This study aimed to establish maxillary basal arch forms using the root apices and to determine the differences in the basal arch forms in adult women with different sagittal skeletal patterns. METHODS: This retrospective study included 91 adult women, with either a Class I (n = 24), Class II Division 1 (n = 22), Class II Division 2 (n = 23), or Class III (n = 22) malocclusion, who underwent cone-beam computed tomography. Three-dimensional coordinates of the root apices were determined using the multiplanar reformation mode of OnDemand3D software (Cybermed Inc, Seoul, South Korea). Two-dimensional coordinates were converted from acquired 3-dimensional coordinates via projection on the palatal plane, and the Procrustes superimposition method was used to build the basal arch form. Finally, interroot width measurements were performed for basal arch form comparisons. RESULTS: There were significant differences among the 4 groups (P <0.05) with respect to the intercanine width. The intercanine width of Class II Division 1 group was significantly narrower than that of the other groups. The Class II Division 1 and Class II Division 2 groups tended to have tapered arch forms and squared arch forms, respectively. CONCLUSIONS: We established maxillary basal arch forms using the root apices. The Class II Division 1 group had a significantly narrower intercanine distance. The use of the root apex to depict the basal arch form seems reasonable.


Assuntos
Arco Dental/diagnóstico por imagem , Má Oclusão de Angle Classe II/diagnóstico por imagem , Adulto , Cefalometria , Feminino , Humanos , Maxila/diagnóstico por imagem , Projetos Piloto , República da Coreia , Estudos Retrospectivos
15.
Am J Orthod Dentofacial Orthop ; 158(4): e5-e15, 2020 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-32843251

RESUMO

INTRODUCTION: The objective of this research was to evaluate the anterior tooth alignment and dental arch dimension changes after orthodontic treatments with and without premolar extractions in the long-term. METHODS: Fifty-seven patients with Class I and Class II malocclusion were divided into 2 groups. Group 1 included 16 patients treated with nonextraction therapy, with mean initial (T1), final (T2), and long-term follow-up (T3) ages of 13.20 years, 15.07 years, and 50.32 years, respectively. The mean treatment (T2 - T1) and long-term follow-up (T3 - T2) times were 1.86 years and 35.25 years, respectively. Group 2 included 41 patients treated with extraction of 4 first premolars, with T1, T2, and T3 ages of 13.31 years, 15.63 years, and 53.60 years, respectively. The mean treatment and long-term follow-up times were 2.32 years and 37.96 years, respectively. The mean retention time was 2.26 years for both groups. The dental casts were obtained and digitized at T1, T2, and T3 stages. The following measurements were obtained: Little irregularity index, arch length, perimeter, and intercanine, interpremolar, and intermolar widths. Intragroup and intergroup comparisons were performed with repeated measures analysis of variance and t tests, respectively. RESULTS: Anterior tooth irregularity index increased at T3 in both groups. In addition, all arch dimensions, except the intercanine width, were significantly smaller in the extraction group at T3. Both groups showed similar arch dimension changes at T3, except for the mandibular arch perimeter. The percentage of mandibular anterior tooth alignment change was significantly greater in the nonextraction than in the extraction group. CONCLUSIONS: There was no difference in the changes of anterior alignment and transverse arch dimensions in patients treated with and without premolar extraction at T3, but the percentage of mandibular anterior tooth alignment changes was higher in the nonextraction than in the extraction patients at T3. The mandibular arch perimeter showed more of a decrease at T3 in extraction patients.


Assuntos
Arco Dental/diagnóstico por imagem , Má Oclusão de Angle Classe II/diagnóstico por imagem , Má Oclusão de Angle Classe II/terapia , Adolescente , Dente Pré-Molar/cirurgia , Cefalometria , Seguimentos , Humanos , Extração Dentária
16.
Wiad Lek ; 73(6): 1103-1107, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32723934

RESUMO

OBJECTIVE: The aim is development and analysis of regression models of linear dimensions necessary for the construction of the correct form of dental arches in young men with a wide face, depending on the features of odontometric and cephalometric indicators. PATIENTS AND METHODS: Material and methods: Primary computed tomographic indices of tooth size and cephalometric parameters of 44 young men with normal occlusion were obtained from the data bank of the National Pirogov Memorial Medical University, Vinnytsya. Face type was determined using the Garson morphological index. In licensed statistical package "Statistica 6,0" developed regression models of linear dimensions necessary for the construction of the correct form of dental arches. RESULTS: Results: As a result of researches, it is established that all 18 reliable models of the sizes used for construction of the correct form of dental arches, depending on peculiarities of odontometric and cephalometric indices with a coefficient from 0.645 to 0.944 are constructed. Built models in adolescents with a broad face type more often include odontometric than cephalometric indicators. The most commonly used odontometric indices are: the width of the crowns of the teeth in the mesio-distal and vestibulo-oral directions, as well as the distance from the middle of the cutting edge to the apex of the root of the teeth in the vestibulo-oral direction. CONCLUSION: Conclusions: In adolescents with a broad type of face with normal occlusion, all 18 possible reliable regression models of reproduction of the individual characteristics of the dental arches of the upper and lower jaws were determined and analyzed.


Assuntos
Arco Dental , Dente , Adolescente , Cefalometria , Face/anatomia & histologia , Humanos , Masculino , Mandíbula
17.
Prog Orthod ; 21(1): 28, 2020 Jul 28.
Artigo em Inglês | MEDLINE | ID: mdl-32719906

RESUMO

AIM: The aim of the present study was to compare the accuracy of the actual space obtained through interproximal enamel reduction (IPR) compared to the amount of IPR planned through the digital setup during clear aligner treatment (CAT). MATERIALS AND METHODS: A total of 10 clinicians were randomly recruited using the Doctor Locator by Align Technology (California). For each clinician, four consecutive patients treated with CAT and manual stripping were selected for a total of 40 subjects and 80 dental arches. For each patient, the amount of planned IPR and the amount of actual IPR performed were recorded. Each arch was considered individually. For each arch, the mesio-distal tooth measurements were obtained from second to second premolars. RESULTS: No systematic measurement errors were identified. In 25 cases, stripping was planned and performed in both arches; in 4 cases only in the upper arch and in the remaining 7 cases only in the lower arch. The difference between planned IPR and performed IPR was on average 0.55 mm (SD, 0.67; P = 0.022) in the upper arch and 0.82 mm (SD, 0.84; P = 0.026) in the lower arch. The accuracy of IPR in the upper arch was estimated to be 44.95% for the upper arch and 37.02% for the lower arch. CONCLUSION: Overall, this study showed that the amount of enamel removed in vivo did not correspond with the amount of IPR planned. In most cases, the performed IPR amount was lower than planned. When considering the actual amount in millimeter, these differences may not be considered clinically relevant.


Assuntos
Esmalte Dentário , Aparelhos Ortodônticos Removíveis , Dente Pré-Molar , Arco Dental , Humanos
18.
J Clin Pediatr Dent ; 44(3): 185-189, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32644898

RESUMO

Infraocclusion occurs at an early age and becomes worse with age, causing increased damage in young children. Extraction of affected teeth is the preferred treatment modality for prevention of possible complications. It is rare for a primary molar to temporarily exhibit secondary failure of eruption, followed by regeneration of full eruptive capacity. This report was written to describe two patients who experienced spontaneous eruption of an infraoccluded primary molar at approximately 7 years of age. While watchful waiting is not always a suitable treatment option, we propose that extraction be deferred until the first permanent molar erupts, unless significant problems occur.


Assuntos
Dente Molar , Dente Decíduo , Criança , Pré-Escolar , Arco Dental , Humanos , Erupção Dentária
19.
J Biol Regul Homeost Agents ; 34(3 Suppl. 1): 107-116, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32618168

RESUMO

The aim of this study was to evaluate the shape and the average size of the maxillary and mandibular arch in an Italian adolescents' sample with correct occlusion, using the digital technology. The study sample was composed, after the use of an extra-oral scanner and after the application of inclusion and exclusion criteria, by the digitized dental casts of 79 Italian adolescents (39 females and 40 males), aged 14±1 years, with correct occlusion. On each model, both upper and lower, the reference points of the dental arches (FA), of the alveolar bone (WALA ridges) and of the incisal edge of the central incisors were identified. With these points, using a software, fourteen parameters were evaluated for each cast: basal and dental intermolar and inter-canine width, basal and dental molar and canine depth, basal and dental molar and canine ratio, overjet, overbite. Finally, the shape of the arches was assessed, dividing it into ovoid, triangular or square. Chi-square test and Student's T-test for each parameter were adopted with a p<0,05 significance level. The results showed that the ovoid form was the most frequent, followed by the triangular one for the upper arch and by the rectangular one for the lower arch. On the canine level, both upper and lower, both for dental and for basal references, the triangular shape showed the lowest width and ratio values and the highest depth values in comparison with the other two groups. The square one showed the opposite situation, and the ovoid one presented in the intermediate value. On the molar level the trend is quite similar to the canine one. The results obtained maybe suggest that on a significant percentage of the patients of the sample is expected to use a preformed ovoid arch wire, and the data found could be useful to study the adequacy of the arch wires currently on the market or to design new ones. .


Assuntos
Má Oclusão de Angle Classe II , Dente , Adolescente , Arco Dental/diagnóstico por imagem , Modelos Dentários , Feminino , Humanos , Itália , Masculino , Mandíbula/diagnóstico por imagem , Maxila/diagnóstico por imagem , Dente Molar
20.
Rev. Soc. Odontol. La Plata ; 30(58): 13-17, jul. 2020. ilus, graf
Artigo em Espanhol | LILACS | ID: biblio-1119236

RESUMO

Las compresiones del maxilar superior son alteraciones transversales por discrepancia óseo-dentaria. .En la dentición mixta temprana puede establecerse la estrechez mediante índices que relacionan el tamaño dental con el ancho transversal del arco dentario. Se analizaron 33 modelos superiores de niños en el tercer período de desarrollo clínico según Barnett. Se estableció la estrechez realizando el análisis métrico del arco dental mediante el índice de Pont. Se describió la anomalía de posición anterior según las siguientes variables: A) Apiñamiento dentario: 1-Escalón de los dientes anterosuperiores; 2-Rotación mesial de los cuatro incisivos; 3-Rotación mesial de los incisivos centrales y rotación distal de los incisivos laterales y 4-Rotación distal de los incisivos centrales. B) Ausencia de apiñamiento: 1-Reabsorción atípica y 2- Ausencia de reabsorción atípica. Las anomalías de posición y/o reabsorciones atípicas anteriores en este período de desarrollo clínico se asocian a estrechez transversal del maxilar superior Siendo la malposición más frecuente la rotación mesial de los cuatro incisivos, siguiendo las reabsorciones atípicas y el escalón de los dientes anterosuperiores, luego la rotación mesial de los incisivos centrales y distal de los laterales y por último la rotación distal de los incisivos centrales (AU)


Inside the traverse alteration of the maxillary the compressions are described as uni or bilateral where an imbalance is settled down between the dental size and the size of the maxillary causing alterations in the position of the teeth. In the early mixed teething the narrowness of the maxillary can be settled by means of indexes that relate the dental size with the traverse width of the dental arch. Thirty models of the maxillary of children according to Barnett's third development period were analyzed. The metrical analysis of the dental arch form was carried out through Pont's index. The theoretic values were compared with the real ones establishing the deviations of the norm that is to say the narrow nest. Out of the 30 cases analyzed, 40% presented mesial rotation of the 4 incisors; 27% showed a stop of the front teeth; 27% atypical reabsorption; 20% mesial rotation of the central incisors and distal rotation of the lateral incisors and the 10% presented a distal rotation of the central incisors. With regard to the front atypical discrepancy 36.66% of the cases had a discrepancy above 6 mm and the 23.33% below 3 mm (AU)


Assuntos
Humanos , Masculino , Feminino , Criança , Arco Dental/anormalidades , Dentição Mista , Diagnóstico Precoce , Anormalidades Maxilomandibulares/diagnóstico , Análise Estatística , Incisivo/anormalidades , Má Oclusão/diagnóstico , Maxila/anormalidades
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA
...