Prevalence of Torus Palatinus and association with dental arch shape in a multi-ethnic cohort

INTRODUCTION: This study aims to determine the shape and dimension of dental arches from a lingual perspective, and determine shape and size of a straight archwire used for lingual Orthodontics. METHODS: The study sample comprised 70 Caucasian Brazilian individuals with normal occlusion and at least four of Andrew's six keys. Maxillary and mandibular dental casts were digitized (3D) and the images were analyzed by Delcam Power SHAPET 2010 software. Landmarks on the lingual surface of teeth were selected and 14 measurements were calculated to determine the shape and size of dental arches. RESULTS: Shapiro-Wilk test determined small arch shape by means of 25th percentile (P25%) - an average percentile for the medium arch; and a large one determined by means of 75th percentile (P75%). T-test revealed differences between males and females in the size of 12 dental arches. CONCLUSION: The straight-wire arch shape used in the lingual straight wire technique is a parabolic-shaped arch, slightly flattened on its anterior portion. Due to similarity among dental arch sizes shown by males and females, a more simplified diagram chart was designed.

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Enigma of Fixed Retainers

Orthodontic Journal of Nepal ◽

10.3126/ojn.v7i2.20168 ◽

2018 ◽

Vol 7 (2) ◽

pp. 52-55

Author(s):

Jijo C Eapen ◽

Amit Prakash

Keyword(s):

Orthodontic Treatment ◽

Treatment Result ◽

Dental Arch ◽

Careful Evaluation ◽

Retention Period ◽

Treatment Situation ◽

Patient Cooperation ◽

Time Required ◽

Fixed Retainers ◽

Arch Shape

Fixed retainers are a reliable form of retention for avoiding relapse and maintaining dental arch shape. They function regardless of patient cooperation, and they fulfill high esthetic expectations. Teeth have tendency to return to their former position, as time required for retaining the treatment result. The most appropriate mode of retention for the post-treatment situation should be used, based on a careful evaluation of the patient’s pretreatment diagnostic records, habits, cooperation, growth pattern, and age. Retention after orthodontic intervention is as important part of the therapy as the active treatment. Age and maturity of the patients, result of the orthodontic intervention, origin and character of the anomaly, type of the retainer, compliance of the patients; all can influence the chance of relapse. The retention period should be twice longer than the active orthodontic treatment. This article covers various aspect of fixed retention in detail

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Changes of mandibular dental arch shape during adolescence and its influence on late mandibular incisor crowding

HOMO ◽

10.1127/homo/2019/1070 ◽

2019 ◽

Vol 70 (3) ◽

pp. 185-192

Author(s):

Martina Zigante ◽

Andrej Pavlic ◽

Vaska Vandevska Radunovic ◽

Alana Mathewson ◽

Ana Kotarac Knezevic ◽

...

Keyword(s):

Dental Arch ◽

Mandibular Incisor ◽

Arch Shape

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Dental arch shape and tooth wear variability

American Journal of Physical Anthropology ◽

10.1002/ajpa.1330820314 ◽

1990 ◽

Vol 82 (3) ◽

pp. 385-395 ◽

Cited By ~ 18

Author(s):

Stephen Molnar ◽

Iva M. Molnar

Keyword(s):

Tooth Wear ◽

Dental Arch ◽

Arch Shape

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Mathematical and descriptive classification of variations in dental arch shape in an Australian aborigine population

Archives of Oral Biology ◽

10.1016/0003-9969(88)90020-9 ◽

1988 ◽

Vol 33 (12) ◽

pp. 901-906 ◽

Cited By ~ 2

Author(s):

J.K. McKee ◽

S. Molnar

Keyword(s):

Dental Arch ◽

Australian Aborigine ◽

Arch Shape

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A METHOD FOR MODELING ARTIFICIAL DENTURES IN PATIENTS WITH ADENTIA BASED ON INDIVIDUALSIZES OF ALVEOLAR ARCHES AND CONSTITUTION TYPE

Archiv Euromedica ◽

10.35630/2199-885x/2021/11/1.25 ◽

2021 ◽

Vol 11 (1) ◽

pp. 109-115

Author(s):

Dmitry Domenyuk ◽

Ghamdan Al-Harazi ◽

Vladimir Shkarin ◽

Sergei Dmitrienko ◽

Taisiya Kochkonyan ◽

...

Keyword(s):

Graphical Method ◽

Age Groups ◽

Optimal Shape ◽

Dental Arch ◽

Aesthetic Results ◽

Biometric Measurements ◽

Upper Jaw ◽

Constitution Type ◽

Arch Index ◽

Arch Shape

87 persons of older age groups with complete adentia underwent somatometric (anthropometric) as well as biometric measurements with cast models of the toothless jaws. The linear and index somatometric parameters, and linear and index parameters for the upper jaw alveolar arches, were calculated. Alveolar arches were classified in view of the total sum of the diagonal dimensions (macro-, micro- and normodiagonal type), the arch index (brachy-, dolicho- and mesoarch type). Modelling the projected shape of the dental arch was based on the parameters of length (the sum of the alveolar arches diagonals multiplied by the 1.06 coefficient), width (the product of the width of the alveolar arches by a coefficient of 1.16). The depth of the dental arch frontal segment was calculated as the product of the diagonal by the incisor-canine angle sine, which in case of mesotrusion arches is 0.42 (angle value — 25°), for protrusion arches — 0.5 (angle value — 30°), for retrusion arches — 0.34 (angle value — 20°). Given the regularities of the circle geometry, the frontal segment dimensions served to determine the radius of the circle where the front teeth sat. The graphical method developed to construct the forecasted upper dental arch shape, based on the balance of the alveolar and dental arches major parameters, allows forecasting the optimal shape and size of the artificial dental arch, achieving a balanced relationship between the shapes of the teeth and the alveolar arches, as well as constructing a balanced articulatory relationship while achieving optimal functional and aesthetic results.

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Dental arch size and shape after maxillary expansion in bilateral complete cleft palate: A comparison of three expander designs

The Angle Orthodontist ◽

10.2319/020219-74.1 ◽

2019 ◽

Vol 90 (2) ◽

pp. 233-238 ◽

Cited By ~ 2

Author(s):

Fernando Pugliese ◽

Juan Martin Palomo ◽

Louise Resti Calil ◽

Arthur de Medeiros Alves ◽

José Roberto Pereira Lauris ◽

...

Keyword(s):

Cleft Lip ◽

Cleft Lip And Palate ◽

Procrustes Analysis ◽

Size Analysis ◽

Dental Arch ◽

Maxillary Expansion ◽

Size And Shape ◽

T1 And T2 ◽

Quad Helix ◽

Arch Shape

ABSTRACT Objective: The objective of this study was to compare the effects on upper dental arch size and shape after maxillary expansion with Hyrax, Quad-helix, and a differential opening expander in bilateral cleft lip and palate (BCLP) patients. Materials and Methods: Seventy-five BCLP patients were divided into three groups: Hyrax (H), Quad-helix (QH), and Expander with differential opening (EDO). Digital models were obtained before (T1) and after 6 months (T2) of maxillary expansion. Twelve landmarks were placed by one investigator on T1 and T2 dental models of each group, and x,y coordinates for each landmark were collected. For dental arch size analysis, centroid size of each dental arch at T1 and T2 was calculated from raw coordinates and was used as the measure of size. Procrustes Analysis was performed for dental arch shape analysis. Analysis of variance was used to compare the groups for size and shape differences (P < .05). Results: There were no significant dental arch size differences among the expanders at T1 or T2. Differences in arch shape were found between all groups at T2. Intragroup arch shape showed a significant variation for the QH and EDO groups. while it remained stable in the H group. Conclusions: Both the QH and the EDO create dental arch shape changes with greater intercanine than intermolar increase. The H does not change the dental arch shape.

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Dental arch changes comparison between expander with differential opening and fan-type expander: a randomized controlled trial

European Journal of Orthodontics ◽

10.1093/ejo/cjaa050 ◽

2020 ◽

Author(s):

Camila Massaro ◽

Guilherme Janson ◽

Felicia Miranda ◽

Aron Aliaga-Del Castillo ◽

Fernando Pugliese ◽

...

Keyword(s):

Randomized Controlled Trial ◽

Controlled Trial ◽

Dental Arch ◽

Maxillary Expansion ◽

Nasal Bridge ◽

Arch Width ◽

Randomized Controlled ◽

Permanent Molar ◽

Maxillary Arch ◽

Arch Shape

Summary Objectives To compare posterior crossbite correction frequency and dentoalveolar changes of the expander with differential opening (EDO) and the fan-type expander (FE). Trial design Two-arm parallel randomized controlled trial. Methods Forty-eight patients from 7 to 11 years of age were allocated into two groups. Twenty-four patients were treated with the EDO and 24 patients were treated with the FE. Block randomization was performed. The study was single blind. Digital dental models were acquired before treatment and 6 months after rapid maxillary expansion. The primary outcomes were crossbite correction rate and maxillary arch width changes. Secondary outcomes were interincisal diastema, arch perimeter, length, size and shape, and mandibular dental arch changes. Results The final sample comprised 24 patients (13 female and 11 male; mean initial age of 7.62 years) in the EDO group and 24 patients (14 female and 10 male; mean initial age of 7.83 years) in the FE group. The crossbites were corrected in 100 per cent of subjects from EDO group and in 75 per cent of patients in FE group. EDO showed greater increases in maxillary intermolar region (P < 0.001), while the FE demonstrated greater increases in the intercanine distance (P = 0.008). Increase in mandibular inter-first permanent molar distance was slightly greater in the EDO group (mean difference of 0.8 mm). Changes in arch length and perimeter were similar in both groups. Both expanders changed the maxillary arch shape. The post-treatment arch shape was larger in the anterior region for FE and in the posterior region in the EDO group. Harms Discomfort during activation was reported by 54 per cent of the participants. A temporary change in the nasal bridge was reported by one patient from FE group. Conclusions Maxillary arch width and shape changes were distinct between the EDO and the FE. Greater transversal increases of the anterior and posterior regions were observed for the FE and the EDO, respectively. A slightly greater mandibular spontaneous expansion was observed for the EDO only at the molar region. Trial registration NCT03705871.

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