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Comparative study of dental arch width in plaster models, photocopies and digitized images

ROSSETO, Maria Cristina; PALMA, Fernanda Maria Cassinelli; FERREIRA, Rívea Inês; PINZAN, Arnaldo; VELLINI-FERREIRA, Flávio
Fonte: Sociedade Brasileira de Pesquisa Odontológica Publicador: Sociedade Brasileira de Pesquisa Odontológica
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
37.04%
The aim of this study was to comparatively assess dental arch width, in the canine and molar regions, by means of direct measurements from plaster models, photocopies and digitized images of the models. The sample consisted of 130 pairs of plaster models, photocopies and digitized images of the models of white patients (n = 65), both genders, with Class I and Class II Division 1 malocclusions, treated by standard Edgewise mechanics and extraction of the four first premolars. Maxillary and mandibular intercanine and intermolar widths were measured by a calibrated examiner, prior to and after orthodontic treatment, using the three modes of reproduction of the dental arches. Dispersion of the data relative to pre- and posttreatment intra-arch linear measurements (mm) was represented as box plots. The three measuring methods were compared by one-way ANOVA for repeated measurements (α = 0.05). Initial / final mean values varied as follows: 33.94 to 34.29 mm / 34.49 to 34.66 mm (maxillary intercanine width); 26.23 to 26.26 mm / 26.77 to 26.84 mm (mandibular intercanine width); 49.55 to 49.66 mm / 47.28 to 47.45 mm (maxillary intermolar width) and 43.28 to 43.41 mm / 40.29 to 40.46 mm (mandibular intermolar width). There were no statistically significant differences between mean dental arch widths estimated by the three studied methods...

Influence of adenotonsillectomy on hard palate dimensions

Vieira, Bruno Boaventura; Meng Sanguino, Ana Carolina; Mattar, Sara Elisa; Itikawa, Carla Enoki; Anselmo-Lima, Wilma T.; Pereira Valera, Fabiana Cardoso; Nakane Matsumoto, Mirian Aiko
Fonte: ELSEVIER IRELAND LTD; CLARE Publicador: ELSEVIER IRELAND LTD; CLARE
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
27.17%
Objective: To evaluate hard palate width and height in mouth-breathing children pre- and post-adenotonsillectomy. Methods: We evaluated 44 children in the 3-6 year age bracket, using dental study casts in order to determine palatal height, intercanine width, and intermolar width. The children were divided into two groups: nasal breathing (n = 15) and mouth breathing (n = 29). The children in the latter group underwent adenotonsillectomy. The study casts were obtained prior to adenotonsillectomy, designated time point 1(11), at 13 months after adenotonsillectomy (T2), and at 28 months after adenotonsillectomy (13). Similar periods of observation were obtained for nasal breathing children. Results: At T1, there was a significantly lower intercanine width in mouth breathing children; intermolar width and palate height were similar between groups. After surgery, there was a significant increase in all the analyzed parameters in both groups, probably due to facial growth. Instead, the increase in intercanine width was substantially more prominent in mouth breathing children than in nasal breathing children, and the former difference failed in significance after the procedure. Conclusions: There were no significant differences between the nasal-breathing and mouth-breathing children in terms of intermolar width and palatal height prior to or after tonsillectomy. Although intercanine width was initially narrower in the mouth-breathing children...

Estabilidade da correção do apinhamento ântero-inferior na má oclusão de classe II de angle tratada com extração de dois e quatro pré-molares ; Stability of the lower anterior crowding correction, in angle class II malocclusion patients treated with two and four premolars extractions

Busato, Mauro Carlos Agner
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 04/02/2003 PT
Relevância na Pesquisa
26.46%
O objetivo desse estudo foi comparar a estabilidade de correção do apinhamento ântero-inferior, em pacientes portadores de má oclusão Classe II de Angle, que haviam se submetido à tratamento ortodôntico com duas ou com quatro extrações de pré-molares. Para tanto, foram selecionados 66 pacientes que apresentavam inicialmente uma má oclusão de no mínimo meia Classe II, e que foram tratados com uma das formas de tratamento propostas. Esses pacientes foram divididos em dois grupos, sendo o grupo 1 (pacientes tratados com extração de dois pré-molares superiores), constituído de 19 pacientes, com idade média de 14,04 anos; e o grupo 2 (pacientes tratados com extração de quatro pré-molares) composto de 47 pacientes, com idade média de 13,03 anos. Para verificação das diferenças entre os grupos da recidiva do apinhamento inferior, utilizou-se o Índice de Irregularidade de Little, medindo-se os modelos referentes às fases pré-tratamento, pós-tratamento, e em média cinco anos após o final do tratamento ativo. Adicionalmente, realizou-se avaliações do comportamento da largura e do comprimento do arco inferior, durante o período do tratamento e pós-tratamento, buscando-se evidenciar possíveis diferenças entre as duas abordagens terapêuticas. As alterações do índice de Little e das dimensões do arco inferior...

Alterações das dimensões dos arcos dentários e das inclinações dos incisivos produzidas pelo Sistema Damon; Arch width and incisor torque changes produced by the Damon System

Bezerra, Valeria Matos
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 19/12/2012 PT
Relevância na Pesquisa
36.38%
PROPOSIÇÃO: O objetivo deste trabalho foi descrever as alterações das dimensões dos arcos dentários e das inclinações dos incisivos produzidas pelo Sistema Damon, durante a fase de alinhamento e nivelamento. Outro objetivo foi verificar a correlação destas alterações com o padrão de crescimento dos indivíduos. MATERIAL E MÉTODOS: modelos de estudo, telerradiografias convencionais e telerradiografias reconstruídas a partir de tomografias computadorizadas cone-beam de 22 casos tratados com o bráquetes Damon 3MXTM foram avaliados durante a fase de alinhamento e nivelamento. Os modelos de estudo foram obtidos ao início do tratamento (T0), após a primeira troca de fio (T1) e na inserção do fio de aço 0,019 x 0,025 (T2). Foram verificados os comprimentos de arco e as dimensões transversais nas regiões de caninos, primeiros e segundos pré-molares e primeiros molares mensuradas a partir das pontas de cúspides e margens gengivais linguais dos dentes, a cada etapa. Nas telerradiografias foram verificadas as alterações das inclinações dos incisivos inferiores e superiores, bem como o padrão de crescimento dos indivíduos. RESULTADOS: os comprimentos dos arcos e todas as distâncias transversais apresentaram aumentos significantes...

Análise em 3D das alterações dimensionais dos arcos dentários de crianças com fissura labiopalatina; 3D analysis of changes in dental arch dimensions in children with cleft lip and palate.

Sakoda, Karine Vaz Laskos
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 16/07/2014 PT
Relevância na Pesquisa
27.02%
O propósito deste trabalho foi uma avaliação longitudinal das dimensões dos arcos dentários de crianças com fissura labiopalatina após a realização das cirurgias primárias. A amostra foi composta por modelos digitais tridimensionais obtidos a partir de modelos de gesso de 25 indivíduos com fissura transforame incisivo unilateral (Grupo FTIU) e 29 pacientes com fissura pós-forame incisivo (Grupo FP). As dimensões maxilares foram avaliadas aos 3 meses de idade (previamente à queiloplastia), com 1 ano de idade (previamente à palatoplastia) e aos 2 anos de idade. As seguintes dimensões foram obtidas: comprimento anterior do arco maxilar, comprimento total do arco maxilar, distância intercaninos e distância intertuberosidades. Após a queiloplastia, houve redução na distância intercaninos e no comprimento anterior do arco no grupo FTIU. Após a palatoplastia, as dimensões maxilares apresentaram aumento significativo, com exceção da distância intercaninos no grupo FTIU e da distância intertuberosidades em ambos os grupos. Pode-se concluir que, no grupo FTIU, a queiloplastia teve maior influência na porção anterior do arco. A palatoplastia inibiu o crescimento no sentido transversal nas regiões anterior e posterior do arco. No grupo FP...

Effect of heat treatment on stainless steel orthodontic wires

Cuoghi, Osmar Aparecido; Kasbergen, Geraldo Francisco; Santos, Paulo Henrique dos; Mendonça, Marcos Rogério de; Tondelli, Pedro Marcelo
Fonte: Sociedade Brasileira de Pesquisa Odontológica (SBPqO) Publicador: Sociedade Brasileira de Pesquisa Odontológica (SBPqO)
Tipo: Artigo de Revista Científica Formato: 128-134
ENG
Relevância na Pesquisa
26.23%
This study evaluated the effect of heat treatment on CrNi stainless steel orthodontic archwires. Half of forty archwires of each thickness - 0.014 (0.35 mm), 0.016 (0.40 mm), 0.018 (0.45 mm) and 0.020 (0.50 mm) (totalling 160 archwires) - were subjected to heat treatment while the remainder were not. All of the archwires had their individual thickness measured in the anterior and posterior regions using AutoCad 2000 software before and after compressive and tensile strength testing. The data was statistically analysed utilising multivariance ANOVA at a 5% significance level. All archwires without heat treatment that were subjected to tensile strength testing presented with anterior opening, which was more accentuated in the 0.020 archwires. In the posterior region, the opening produced by the tensile force was more accentuated in the archwires without heat treatment. There was greater stability in the thermally treated archwires, especially those subjected to tensile strength testing, which indicates that the heat treatment of orthodontic archwires establishes a favourable and indispensable condition to preserve the intercanine width.

Nasal width as a guide for the selection of maxillary complete denture anterior teeth in four racial groups

Varjão, Fabiana Mansur; Nogueira, Sergio Sualdini
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Artigo de Revista Científica Formato: 353-358
ENG
Relevância na Pesquisa
27.11%
Purpose: Selecting artificial teeth for edentulous patients is difficult when pre-extraction records are not available. Various guidelines have been suggested for determining the width of the maxillary anterior denture teeth. This study was undertaken to evaluate the use of the nasal width as a guide for the selection of proper width maxillary anterior denture teeth in four racial groups of the Brazilian population. Materials and Methods: One hundred and sixty subjects (40 Whites, 40 Mulattos, 40 Blacks, and 40 Asians) were selected. Using a sliding caliper, the nasal width and the intercanine distance were measured. The Pearson product-moment correlation coefficient was used to determine the relationship between the above measurements. A prediction was made of the percentage of subjects of the White, Mulatto, Black, and Asian populations in which the selection error due to the clinical application of the method of the nasal width would be within 0 to 2 mm, within 2 to 4 mm, and greater than 4 mm. Results: The four racial groups showed a weak correlation between the intercanine distance and the nasal width. In 39.7% of the White, 55.7% of the Mulatto, 81.9% of the Black, and 48.2% of the Asian populations, errors greater than 4 mm would be present with the use of the nasal width. Conclusions: The correlation found between the intercanine distance and the nasal width was not high enough to be used as a predictive factor. The relationship between natural tooth width and artificial tooth width as predicted by the nasal width showed that the nasal width method is not accurate for all the studied groups. Copyright © 2006 by The American College of Prosthodontists.

Lower intercanine width and gingival margin changes. A retrospective study.

Closs, Luciane; Squeff, Karine; Raveli, Dirceu; Rösing, Cassiano
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Artigo de Revista Científica Formato: 41-45
ENG
Relevância na Pesquisa
47.07%
OBJECTIVE: To determine if changes in the lower intercanine widths during orthodontic treatment with fixed appliances result in gingival margin changes around the lower canines and incisors. METHOD: Pre- and post-treatment intra-oral photographs and orthodontic study models of 178 Caucasian adolescents (101 female, 77 male) were used. All subjects were treated with fixed appliances. The subjects had mean ages of 11.41 (SD: 1.83) years and 14.91 (SD: 1.78) years on their initial and final records respectively. The latter were taken 28 days or more after the appliances had been removed. The inclusion criteria were: Angle Class I or Class II malocclusion (with or without transverse and/or vertical discrepancies); nonextraction treatment; less than 4 mm crowding or spacing; fully erupted lower incisors and good periodontal health. The intercanine widths and the positions of the gingival margins relative to the maximum curvatures of the labial surfaces of the lower canines and incisors were measured with digital calipers. RESULTS: A significant association was found between unaltered intercanine widths and coronal migration of the gingival margins (p = 0.045). There were no significant associations between either increased or reduced intercanine widths and changes in the gingival margins. CONCLUSIONS: Following orthodontic treatment coronal migration of the gingival margins around the lower incisors and canines is more likely to be associated with an unaltered intercanine width.

Associação de fatores relacionados à movimentação ortodôntica e o desenvolvimento de recessões gengivais

Closs, Luciane Quadrado
Fonte: Universidade Estadual Paulista (UNESP) Publicador: Universidade Estadual Paulista (UNESP)
Tipo: Tese de Doutorado Formato: 158 p. ; il.
POR
Relevância na Pesquisa
26.77%
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES); Pós-graduação em Ciências Odontológicas - FOAR; O presente estudo teve por objetivo determinar a ocorrência de recessões gengivais pós-tratamento ortodôntico e os fatores a elas associados, como quantidade de gengiva ceratinizada pré-tratamento ortodôntico, alteração na inclinação dos dentes ântero-inferiores, alteração da distância intercaninos inferiores em incisivos e caninos inferiores. A amostra consistiu de fotografias intra-orais e modelos de estudo de 209 pacientes caucasianos com idade média de 11.20 l 1.83 anos nos exames iniciais e 14.7 l 1.8 anos nos exames finais. Os pacientes foram classificados como Classe I ou II de Angle e foram submetidos a tratamento ortodôntico com aparelho fixo, sem extrações. Recessões gengivais foram avaliadas em fotografias e modelos de estudo nos incisivos e caninos inferiores, nos exames iniciais e finais dos pacientes. A mensuração da gengiva ceratinizada foi feita em fotografias intra-orais e a distância intercaninos em modelos de gesso, em ambas empregando um paquímetro digital. A alteração das inclinações dos dentes ântero-inferiores foi avaliada em telerradiografia de perfil. Observou-se o aumento significativo de recessões em incisivos e caninos após o tratamento ortodôntico. A quantidade de gengiva ceratinizada previamente ao tratamento ortodôntico e a alteração da inclinação dos dentes ântero-inferiores não estão associadas ao desenvolvimento de recessões gengivais pós-tratamento ortodôntico. Também foi observada uma associação entre largura intercaninos inalterada e migração coronal da margem gengival em incisivos e caninos inferiores pós-tratamento ortodôntico.; The aim of the present study was to determine the occurrence of gingival recessions post orthodontic treatment and factors related to orthodontic movement...

Avaliação da oclusão de escolares com lesões cavitadas em dentina em molares decíduos tratados por três abordagens restauradoras : estudo longitudinal

Gomide, Rafael Torminn
Fonte: Universidade de Brasília Publicador: Universidade de Brasília
Tipo: Dissertação
POR
Relevância na Pesquisa
26.69%
Dissertação (mestrado)—Universidade de Brasília, Faculdade de Ciências da Saúde, Programa de Pós-Graduação em Ciências da Saúde, 2014.; Introdução: A lesão cavitada por cárie, quando não tratada, pode ser considerada como fator etiológico da má oclusão. No Brasil, têm ocorrido melhoras constantes dos índices de saúde bucal, como observado pela diminuição do índice ceo-d, principalmente em crianças e adolescentes. Entretanto, lesões cavitadas em dentina ainda são responsáveis por 80% do índice no grupo etário de 5 anos de idade, indicando baixo acesso de pré escolares ao tratamento restaurador. O surgimento de tratamentos minimamente invasivos, como o Tratamento Restaurador Atraumático (ART), e o tratamento ultraconservador (UCT) possibilitam assistência odontológica em locais remotos ou com baixa estrutura física. Entretanto, pouco se sabe a respeito do impacto destas alternativas de tratamento, quando realizadas em dentes decíduos, sobre o desenvolvimento da oclusão. Objetivos: a) avaliar a prevalência de má oclusão em escolares de 6 e 7 anos de idade que apresentavam lesões de cárie cavitadas em dentina envolvendo ou não superfícies proximais e também em crianças que apresentavam perda precoce de molar decíduo em decorrência de lesão cariosa; b) comparar as medidas intra-arcos e entrearcos nas três diferentes relações anteroposteriores...

Correlation between transverse expansion and increase in the upper arch perimeter after rapid maxillary expansion

Claro,Cristiane Aparecida de Assis; Abrão,Jorge; Reis,Silvia Augusta Braga; Fantini,Solange Mongelli de
Fonte: Sociedade Brasileira de Pesquisa Odontológica - SBPqO Publicador: Sociedade Brasileira de Pesquisa Odontológica - SBPqO
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/03/2006 EN
Relevância na Pesquisa
26.69%
The purpose of the present study was to assess the correlation between transverse expansion and the increase in upper arch perimeter, after maxillary expansion. Dental casts of eighteen patients were obtained before treatment and again five months after maxillary expansion. Measurements of intermolar width, intercanine width, arch length and arch perimeter were made with a digital caliper on photocopies taken from the dental casts. After assessment of the method error, a multiple regression model was developed following the identification of the best subset of variables. The resulting equation led to the conclusion that the increase in arch perimeter is approximately given by the addition of 0.54 times the intercanine expansion, and 0.87 times the arch length alteration.

Comparative study of dental arch width in plaster models, photocopies and digitized images

Rosseto,Maria Cristina; Palma,Fernanda Maria Cassinelli; Ferreira,Rívea Inês; Pinzan,Arnaldo; Vellini-Ferreira,Flávio
Fonte: Sociedade Brasileira de Pesquisa Odontológica - SBPqO Publicador: Sociedade Brasileira de Pesquisa Odontológica - SBPqO
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/06/2009 EN
Relevância na Pesquisa
37.04%
The aim of this study was to comparatively assess dental arch width, in the canine and molar regions, by means of direct measurements from plaster models, photocopies and digitized images of the models. The sample consisted of 130 pairs of plaster models, photocopies and digitized images of the models of white patients (n = 65), both genders, with Class I and Class II Division 1 malocclusions, treated by standard Edgewise mechanics and extraction of the four first premolars. Maxillary and mandibular intercanine and intermolar widths were measured by a calibrated examiner, prior to and after orthodontic treatment, using the three modes of reproduction of the dental arches. Dispersion of the data relative to pre- and posttreatment intra-arch linear measurements (mm) was represented as box plots. The three measuring methods were compared by one-way ANOVA for repeated measurements (α = 0.05). Initial / final mean values varied as follows: 33.94 to 34.29 mm / 34.49 to 34.66 mm (maxillary intercanine width); 26.23 to 26.26 mm / 26.77 to 26.84 mm (mandibular intercanine width); 49.55 to 49.66 mm / 47.28 to 47.45 mm (maxillary intermolar width) and 43.28 to 43.41 mm / 40.29 to 40.46 mm (mandibular intermolar width). There were no statistically significant differences between mean dental arch widths estimated by the three studied methods...

Relapse of incisor crowding: A visit to the prince of salina

López-Areal, Luis; Gandía, Jose L.
Fonte: Medicina Oral S.L. Publicador: Medicina Oral S.L.
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
26.38%
The management of the retention period after comprehensive orthodontic treatment is of great importance, as a primary goal of clinician. Considerable controversy still surrounds the problem of stability after the retention period. Many studies analyze factors associated to the presence of crowding or incisor irregularity and find predictive features on its relapse. Most studies have reported little o no correlation between the treatment changes in the biological parameters - clinical, biometric (irregularity index, intermolar width, intercanine width, arch length, overjet, overbite), or cephalometric variables- that ocurred and the posttretament and postretention changes that may predict their future development. This article provides a bibliographical overview on the relapse of dental alignment in treated cases. In a brief historical introduction, the first studies on the long-term stability of orthodontic results are analysed. The article then goes on to assess studies that focus attention on anteroinferior alignment before finally studying relapse of upper crowding. It concludes by making some final comments in the light of the bibliography provided and the differents schools regarding retention needs and methods.

Investigation of the Relationship between the Increase in the Intercanine width and the Children’s Facial Parameters; a 6-month Follow-up Study

Ghaderi, F; Badakhsh, S; Hekmatfar, S
Fonte: Shiraz University of Medical Sciences Publicador: Shiraz University of Medical Sciences
Tipo: Artigo de Revista Científica
Publicado em /06/2013 EN
Relevância na Pesquisa
47.21%
The present study, as a pilot study, aimed to investigate the increase in the intercanine width in different facial forms to predict the amount of future increase in the intercanine width. The results of the pilot study showed that the intercanine width increased more in the boys with wider faces while this relationship was not observed in the girls. Based on the results of this preliminary study, the girls’ facial width could not be considered as a determining criterion in evaluation of the amount of increase in the intercanine width.

A longitudinal study of dental arch dimensions in Australian aboriginals using 2D and 3D digital imaging methods.

Thiyagarajan, Ramya
Fonte: Universidade de Adelaide Publicador: Universidade de Adelaide
Tipo: Tese de Doutorado
Publicado em //2008
Relevância na Pesquisa
36.38%
This study investigated arch dimension changes associated with growth and tooth wear in Australian Aboriginals aged from age 8 to 15 years using 2D and 3D digital imaging systems. Serial dental casts of Australian Aboriginals from Yuendumu were used in the study. The sample comprised 25 females and 24 males for whom casts were available at ages of 8, 12 and 15 years ( a total of 294 dental study casts). The primary method of data acquisition involved obtaining digital photographs and digitizing the images using an Apple IIGS computer and customised software program. A subset of 40 dental stone models (5 individuals at ages 8, 12, 15 and 18 years) were duplicated and scanned using the Minolta Vivid 900 laser surface scanner at the DSIRO Laboratories, National University Singapore. The 3-D images were digitised using the Rapidform software package (Inus, technology, Seoul, Korea). Study variables included mesiodistal crown diameters, arch widths, arch depths and arch lengths. Mesiodistal crown dimensions in males tended to be larger than those in females. All arch dimensions were significantly larger in males than females. Upper and lower Intercanine width increased from age 8 to age 12 years but did not change thereafter. Upper and lower intermolar widths increased with age from 8 years to 15 years while arch depth decreased. No significant reduction in arch lengths was found from age 12 to 15 years. The two imaging systems were comparable in their measurement reliability...

Surgically-assisted rapid maxillary expansion of narrowed maxillae: a case-cohort study

Gamage, Sanjaya Nilantha; Goss, Alastair Norman
Fonte: Australian Society of Orthodontists Publicador: Australian Society of Orthodontists
Tipo: Artigo de Revista Científica
Publicado em //2013 EN
Relevância na Pesquisa
26.38%
Aims: The aim of this study was to investigate a consecutive cohort of surgically-assisted rapid maxillary expansion cases to determine the indications, results and relapse associated with the procedure. Methods: The records of 21 cases of SARME treated by the Oral and Maxillofacial Surgery and Orthodontic units at the University of Adelaide were examined. Overall expansion and subsequent relapse were compared on study models and posteroanterior cephalometric radiographs against the variables of age, gender, surgeon, surgical technique, final occlusion and the retention period. Statistical analysis was performed on paired variables. Results: Maximum expansion was gained across the intermolar width and the most relapse identified across the canines. Male patients showed statistically greater stability across the intercanine width. There were otherwise no significant relationships between the treatment variables, stability or relapse. Conclusions: SARME is a safe surgical technique for narrowed maxillae requiring intermolar expansion of 6 mm or more. Overexpansion of up to 60% is required to compensate for relapse.; Sanjaya N. Gamage and Alastair N. Goss

A longitudinal study of changes in tooth size and dental arch dimensions from the mixed to permanent dentitions in Australian aboriginals.

Tan, Wee Han
Fonte: Universidade de Adelaide Publicador: Universidade de Adelaide
Tipo: Tese de Doutorado
Publicado em //2013
Relevância na Pesquisa
26.85%
Objectives: (i) To investigate tooth size and dental arch dimensional changes from the mixed to permanent dentitions in Australian Aboriginals using a three-dimensional imaging system. (ii) To investigate the extent to which tooth size and dental arch dimensions contribute to dental crowding. Design: Longitudinal retrospective study. Participants/setting: Serial dental models of 49 Australian Aboriginals (28 males and 21 females) from the Yuendumu Study at ages 8, 12 and 15 years (or within a 1 year range). Main Outcome Measures: All the dental models were digitised using a 3D scanner (Optix 400S) and analysed with a 3D modeling software (Rhinoceros ® 3D 4.0). Study variables included mesiodistal tooth widths, arch widths, arch lengths, arch depths and tooth size arch length discrepancy (TSALD). Subjects at age 15 years were then subdivided into crowded (TSALD≤-1mm) and non-crowded (TSALD>-1mm) groups for analysis. Results: The changes in tooth size and dental arch dimensions from the mixed dentition to permanent dentitions are summarized as follows: 1) There was a mean reduction in mesiodistal widths of teeth ranging from 0.07mm to 0.24mm. 2) The intercanine and intermolar widths increased in males and females from the age of 8 to 15 years. 3) Arch length and arch depth showed a progressive reduction between 8 and 15 years of age. 4) Sexual dimorphism was observed whereby males had larger tooth size and dental arch dimensions than females. In crowded subjects...

Evaluation of transverse changes in the dental arches according to growth pattern: a longitudinal study

Ribeiro, Jucienne Salgado; Ambrosio, Aldrieli Regina; dos Santos-Pinto, Ary; Shimizu, Isabella Almeida; Shimizu, Roberto Hideo
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Artigo de Revista Científica Formato: 66-73
ENG
Relevância na Pesquisa
36.98%
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES); Objective: To evaluate changes in intercanine (LICW and UICW) and intermolar (LIMW and UIMW) widths on the dental arches of subjects with normal occlusion and Angle Class I malocclusion during the transition to permanent dentition, and evaluate whether or not facial pattern influences on the normal development of the dentition and occlusion. Methods: Nineteen Caucasian Brazilian children were selected, with ages ranging from 6 to 8.6 years at T1 and from 10.10 to 14.2 years at T2. Their second records consisted of study dental casts and a lateral cephalometric radiograph. To obtain intermolar and intercanine widths a three-dimensional scanner unit (digitizer MicroScribe 3DX) was used connected to a microcomputer. To analyze changes at T1 and T2 Student's paired t-test was applied, whereas Spearman's correlation analysis was used to assess the relationship between measurements obtained at T1 and T2 and the facial pattern, both at 95% level of confidence. Results: The mean values found on each assessment time (T1 and T2) were statistically different (p=0.000 for LICW, p=0.001 for UICW, p=0.000 for UIMW, and p=0.046 for LIMW), regardless of the facial pattern. The anterior dimensions...

Three-dimensional dental arch changes of patients submitted to orthodontic-surgical treatment for correction of Class II malocclusion

Peixoto,Adriano Porto; Pinto,Ary dos Santos; Garib,Daniela Gamba; Gonçalves,João Roberto
Fonte: Dental Press International Publicador: Dental Press International
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/08/2014 EN
Relevância na Pesquisa
26.38%
INTRODUCTION: This study assessed the three-dimensional changes in the dental arch of patients submitted to orthodontic-surgical treatment for correction of Class II malocclusions at three different periods. METHODS: Landmarks previously identified on upper and lower dental casts were digitized on a three-dimensional digitizer MicroScribe-3DX and stored in Excel worksheets in order to assess the width, length and depth of patient's dental arches. RESULTS: During orthodontic preparation, the maxillary and mandibular transverse dimensions measured at the premolar regions were increased and maintained throughout the follow-up period. Intercanine width was increased only in the upper arch during orthodontic preparation. Maxillary arch length was reduced during orthodontic finalization, only. Upper and lower arch depths were stable in the study periods. Differences between centroid and gingival changes suggested that upper and lower arch premolars buccaly proclined during the pre-surgical period. CONCLUSIONS: Maxillary and mandibular dental arches presented transverse expansion at premolar regions during preoperative orthodontic preparation, with a tendency towards buccal tipping. The transverse dimensions were not altered after surgery. No sagittal or vertical changes were observed during the follow-up periods.

Evaluation of transverse changes in the dental arches according to growth pattern: a longitudinal study

Ribeiro,Jucienne Salgado; Ambrosio,Aldrieli Regina; Santos-Pinto,Ary dos; Shimizu,Isabella Almeida; Shimizu,Roberto Hideo
Fonte: Dental Press International Publicador: Dental Press International
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/02/2012 EN
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36.98%
OBJECTIVE: To evaluate changes in intercanine (LICW and UICW) and intermolar (LIMW and UIMW) widths on the dental arches of subjects with normal occlusion and Angle Class I malocclusion during the transition to permanent dentition, and evaluate whether or not facial pattern influences on the normal development of the dentition and occlusion. METHODS: Nineteen Caucasian Brazilian children were selected, with ages ranging from 6 to 8.6 years at T1 and from 10.10 to 14.2 years at T2. Their second records consisted of study dental casts and a lateral cephalometric radiograph. To obtain intermolar and intercanine widths a three-dimensional scanner unit (digitizer MicroScribe 3DX) was used connected to a microcomputer. To analyze changes at T1 and T2 Student's paired t-test was applied, whereas Spearman's correlation analysis was used to assess the relationship between measurements obtained at T1 and T2 and the facial pattern, both at 95% level of confidence. RESULTS: The mean values found on each assessment time (T1 and T2) were statistically different (p=0.000 for LICW, p=0.001 for UICW, p=0.000 for UIMW, and p=0.046 for LIMW), regardless of the facial pattern. The anterior dimensions, UICW and LICW, increased by 3.21 mm and 1.52 mm, respectively. And the posterior dimensions...