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The Angle Orthodontist Mar 2021To compare the effects of a hybrid miniscrew-supported expander versus a conventional Hyrax (CH) expander in growing patients. (Randomized Controlled Trial)
Randomized Controlled Trial
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.
Topics: Child; Female; Humans; Male; Alveolar Process; Cone-Beam Computed Tomography; Dental Arch; Maxilla; Palatal Expansion Technique
PubMed: 33434282
DOI: 10.2319/060820-527.1 -
BMC Oral Health Mar 2021Ethnic background has been claimed to affect arch form. The purpose of this study was to describe and elucidate the maxillary and mandibular arch forms in Jordanian...
BACKGROUND
Ethnic background has been claimed to affect arch form. The purpose of this study was to describe and elucidate the maxillary and mandibular arch forms in Jordanian population and to develop a classification method for these forms which could be employed to construct orthodontic archwires accordingly.
METHODS
The sample was comprised of study casts of five hundred and twenty subjects (231 males and 289 females with a mean age of 15.4 ± 1.02 years). All subjects had permanent dentition with normal occlusion. A mathematical method associated with a polynomial function of 6th degree was employed to assess the dental arch forms. The resultant arch forms were classified into 5 groups for both the maxilla and mandible utilizing a computer software with special code designed for this study. Each group was subdivided into 3 subgroup sizes namely: small, medium, and large.
RESULTS
Catenary arch form was found in 47% and 41.2% (p ˂ 0.01) of maxilla and mandible arch forms, respectively. Form 2 (which is halfway between ellipse and U-shaped arch form) was found in 27.7% and 26.7%. Medium size arch form was found in 55.4% of the maxillary and 65.6% of the mandibular arch forms.
CONCLUSION
Catenary arch form was the most prevalent arch form, followed by wide elliptical form. The other forms, which included tudor arch, tapered equilateral and quadrangular forms were less frequent. Regarding size, the medium size was the most prevalent among the studied samples.
Topics: Adolescent; Cephalometry; Dental Arch; Dentition, Permanent; Female; Humans; Male; Mandible; Maxilla; Models, Dental; Orthodontic Appliances
PubMed: 33750357
DOI: 10.1186/s12903-021-01461-y -
Okajimas Folia Anatomica Japonica 2019Dental arch length, bilateral intermolar distance, morphology of the anterior teeth, and bilateral intercanine distance have been reported as factors influencing the...
Dental arch length, bilateral intermolar distance, morphology of the anterior teeth, and bilateral intercanine distance have been reported as factors influencing the determination of dental arch form. However, studies evaluating the factors that influence the determination of the above-mentioned components are limited. Therefore, to verify these points, the present study aimed to examine factors influencing the determination of dental arch form using statistical methods.Data obtained from sample dental casts were analyzed using principal component and cluster analyses. By principal component analysis, 23 sets of information were summarized into three components for the maxilla and four for the mandible. As a result of cluster analysis using principal component scores, the maxillary and mandibular dental arches were classified into four forms, respectively.Dental arch length is an important indicator of dental arch size and is influenced by the bilateral interincisor distance of the maxilla and mandible, and the mesiodistal crown width of the incisors and premolars. In the mandible, canine width also affects dental arch length. Dental arch width also influences the determination of dental arch form. However, the distance between the anterior teeth and the distance between the molars are independent and have no effect on each other.
Topics: Adolescent; Adult; Dental Arch; Female; Humans; Male; Young Adult
PubMed: 31462623
DOI: 10.2535/ofaj.96.31 -
Journal of Dentistry Jun 2023This review was undertaken to evaluate, whether a shortened dental arch (SDA) was a good alternative to a conventional prosthodontic rehabilitation (RPD) in older adults... (Review)
Review
OBJECTIVE
This review was undertaken to evaluate, whether a shortened dental arch (SDA) was a good alternative to a conventional prosthodontic rehabilitation (RPD) in older adults when nutritional and economic factors are compared.
DATA
A total of 92 studies were included for the full-text analysis, and finally 4 reports from two RCTs qualified for data extraction and analysis. The final search update was performed on 06.11.2022 and no further searches and updates were performed after this date.
SOURCES
Electronic databases [PubMed (MEDLINE), Embase, CENTRAL] were systematically searched to identify studies comparing nutritional and economic outcomes in partially edentate adults rehabilitated with conventional RPD and SDA therapy.
STUDY SELECTION
Studies were excluded if there were less than 10 participants per group, and if the subjects were not clinically followed up in recall visits. Two investigators performed the data extraction and were reciprocally blinded. Inter-investigator reliability was assessed using Cohen's unweighted kappa (κ). A meta-analysis could not be performed and the results were reported qualitatively.
RESULTS
The calculated κ ranged between 0.80 and 1.00. Three reports from two studies reported on nutritional outcomes and one report provided information on economic benefits, when comparing between the SDA therapy and conventional prosthodontic rehabilitation. No significant difference was recorded in the nutritional status of patients rehabilitated using the SDA concept compared with RPDs. Higher costs for treatment provision and maintenance for patients in the RPD group was found when compared to SDA treatment.
CONCLUSIONS
This systematic review identified the shortened dental arch concept as a reasonable alternative to the conventional prosthodontic rehabilitation where cost-effectiveness and nutrition are concerned based on the limited evidence obtained from current literature.
CLINICAL SIGNIFICANCE
SDA therapy may be considered as a feasible treatment concept in older adults especially in those with complex medical statuses and limited finances.
Topics: Humans; Aged; Nutritional Status; Dental Arch; Reproducibility of Results; Dental Care; Health Care Costs
PubMed: 37001792
DOI: 10.1016/j.jdent.2023.104483 -
Clinical Oral Investigations Apr 2022The aim of this study was to examine the occlusion of anterior teeth in individuals with shortened dental arch (SDA).
OBJECTIVES
The aim of this study was to examine the occlusion of anterior teeth in individuals with shortened dental arch (SDA).
MATERIAL AND METHODS
In a case-control clinical study, 41 individuals with SDA and 41 individuals with complete dental arch (CDA) participated. The CDA control group was matched for age and gender. Testing for occlusal contacts of anterior maxillary teeth was conducted by biting on foil strips (8 µm) with subjectively normal bite force (NBF) and maximal bite force (MBF). The data was analyzed on individual and tooth levels.
RESULTS
The median rates of anterior maxillary teeth with occlusal contacts were 0.67 (NBF) and 0.83 (MBF) in the SDA group and 0.50 (NBF) and 0.83 (MBF) in the CDA group. Within both groups, the contact rates were significantly higher in MBF. The group difference with NBF was significant. A generalized linear model showed that the odds of an anterior maxillary tooth to have an occlusal contact were greater in the SDA both for NBF with an odds ratio (OR) 2.277 and MBF with an OR 1.691.
CONCLUSIONS
The findings suggest effective compensatory mechanisms relative to the occlusal function in individuals with SDA.
CLINICAL RELEVANCE
The study delivers further evidence regarding the SDA concept as a viable option in the management of posterior tooth loss.
Topics: Bite Force; Dental Arch; Dental Occlusion; Humans; Jaw, Edentulous, Partially; Tooth; Tooth Loss
PubMed: 34889979
DOI: 10.1007/s00784-021-04317-5 -
Journal of the Indian Society of... 2022The aim of this study was to evaluate the dental arch spatial changes in maxillary and mandibular arches after premature loss of primary molars.
AIM
The aim of this study was to evaluate the dental arch spatial changes in maxillary and mandibular arches after premature loss of primary molars.
INTRODUCTION
Primary teeth must be maintained during the change from primary to mixed and then permanent dentition, to preserve and maintain the dental arch. When this normal process is disturbed, usually due to severe decay requiring extraction before normal exfoliation, it can result in migration of adjacent teeth toward the missing space resulting in decreased arch length and malocclusion in the permanent dentition.
MATERIALS AND METHODS
A comprehensive search was conducted using electronic databases such as PubMed Central, Cochrane Database of Systematic Reviews, Google Scholar, LILACS, and ScienceDirect. The title and abstract were screened to find relevant articles, which were then reviewed in full to see if they were worthy of inclusion. All longitudinal and observational studies that looked at space changes after the loss of primary first or second molars were included. Quality assessment of the studies was done based on the Newcastle-Ottawa scale as all the included studies were non-randomized studies.
RESULTS
Four thousand five hundred and seventy-eight articles were identified by screening electronic database and assessed for eligibility, 12 full-text articles were assessed, and 4 full-text articles were excluded as they did not match the inclusion criteria. Thus, eight articles were included in this systematic review. Short term and long term space changes and loss of maxillary and mandibular molars were studied individually. In the short term changes, the distal migration of the primary cuspid towards the missing space within 1 month was attributable to early space changes after premature loss of the mandibular first molar, and the greatest space loss was recorded in the first 3 months after premature loss. After the premature loss of the maxillary first molar, immediate space loss of 1mm was documented due to distal migration of the primary canine. Studies found that space loss was caused by the distal migration of primary canines in the case of mandibular primary first molar loss, and that space loss was larger in the mandibular arch after premature loss of second primary molars.
CONCLUSION
The greatest repercussions occurred during the first 3 months after the deciduous molars were extracted, and a space maintainer was recommended in the majority of cases, mainly when there is premature loss of mandibular second primary molar as it leads to mesial displacement of the first permanent molar.
Topics: Dental Arch; Maxilla; Molar; Tooth, Deciduous
PubMed: 36260463
DOI: 10.4103/jisppd.jisppd_230_22 -
Dental Press Journal of Orthodontics 2017The aim of this systematic review was to analyze the short and long-term spontaneous dentoalveolar changes of the mandibular dental arch after slow (SME) or rapid (RME)... (Review)
Review
OBJECTIVE:
The aim of this systematic review was to analyze the short and long-term spontaneous dentoalveolar changes of the mandibular dental arch after slow (SME) or rapid (RME) maxillary expansion in the mixed and early permanent dentitions.
METHODS:
An electronic search was performed in the following databases: PubMed/Medline, Cochrane Library, Scopus, Embase and Web of Science. Eligibility criteria for article selection included randomized controlled trials and prospective studies written in English, with no restriction of year of publication, involving patients who underwent SME or RME during the mixed or early permanent dentitions. A double-blind search of articles was performed by two reviewers. Initially, the title and the abstract of the studies were read, and their references were also hand-searched for possible missing studies. A methodological quality scoring scale was used to analyze the selected articles.
RESULTS:
The search retrieved 373 articles, but only 6 were selected for review after application of the eligibility and exclusion criteria. Non-clinically significant spontaneous dentoalveolar changes of approximately 1mm were found in the mandibular dental arch in the short and long-term, after slow or rapid maxillary expansions. Furthermore, no significant differences were found between treated and control groups.
CONCLUSIONS:
There is enough evidence to conclude that negligible short and long-term spontaneous dentoalveolar changes tend to occur in the mandibular dental arch after SME or RME in the mixed and early permanent dentitions. More randomized studies with appropriate control group are required to better evaluate this issue.
Topics: Dental Arch; Dentition, Mixed; Dentition, Permanent; Humans; Maxillofacial Development; Palatal Expansion Technique
PubMed: 28746488
DOI: 10.1590/2177-6709.22.3.055-063.oar -
The Journal of Clinical Pediatric... Sep 2023In this study, we investigated dental arch forms in a representative sample of children with mixed dentition. Twenty-four pairs of study models, belonging to twenty-four...
In this study, we investigated dental arch forms in a representative sample of children with mixed dentition. Twenty-four pairs of study models, belonging to twenty-four youngsters (twelve boys and twelve girls aged 8 to 9 years) with acceptable occlusion, were scanned and assessed by Ortho analyzer software. Three transversal and three vertical measurements were acquired to evaluate the lengths and widths of dental arches, and the ratios between these measurements were standardized. Next, the mean standardized parameters were used to define the dental arch form. Unpaired -tests were used to analyze gender differences for all measures. Subsequently, frequencies and percentages were determined for each arch shape in both jaws and genders, and Pearson's Chi-squared test was used to evaluate differences between genders. Males exhibited higher mean values for all measurements, but without statistical significance. The most prevalent dental arch was the mid form (83.3%) for both jaws and genders.
Topics: Humans; Child; Female; Male; Dental Arch; Dentition, Mixed
PubMed: 37732436
DOI: 10.22514/jocpd.2023.045 -
Progress in Orthodontics May 2023The role of interdental widths and palatal morphology on the development of obstructive sleep apnea (OSA) has not been well investigated in adult patients yet. The aim... (Observational Study)
Observational Study
BACKGROUND
The role of interdental widths and palatal morphology on the development of obstructive sleep apnea (OSA) has not been well investigated in adult patients yet. The aim of this paper was to assess the morphology of maxilla and mandibular dental arches on three-dimensional (3D) casts and to correlate these measurements with the severity of OSA.
METHODS
Sixty-four patients (8 women and 56 men, mean age 52.4) with a diagnosis of mild-to-moderate OSA were retrospectively enrolled. On each patient, home sleep apnea test and 3D dental models were collected. Apnea-hypopnea index (AHI) and oxygen desaturation index (ODI) were recorded, as well as the dental measurements including inter-molar distance, anterior and posterior widths of maxillary and mandibular arches, upper and lower arch lengths, palatal height, and palatal surface area. The respiratory and dental variables were then correlated.
RESULT
A statistically inverse correlation was found between ODI and anterior width of lower arch, maxillary arch length, palatal height, and palatal area. AHI showed a significant inverse correlation with anterior width of mandibular arch and maxillary length.
CONCLUSION
A significant inverse correlation between maxillary and mandibular morphology and respiratory parameters was shown in the present paper.
Topics: Male; Humans; Adult; Female; Middle Aged; Retrospective Studies; Dental Arch; Sleep Apnea, Obstructive; Palate; Mandible
PubMed: 37246168
DOI: 10.1186/s40510-023-00464-5 -
TheScientificWorldJournal 2021This study aimed at finding out whether anterior teeth angulation and inclination have a relationship with the maxillary teeth and dental arch dimensions.
OBJECTIVES
This study aimed at finding out whether anterior teeth angulation and inclination have a relationship with the maxillary teeth and dental arch dimensions.
METHODS
Fifty study models with normal occlusion were selected from the archive of the Department of Orthodontics at Baghdad Dental Faculty. Maxillary dental arch width and length at different points were determined in addition to measuring anterior teeth angulation, inclination, crown thickness, overjet, overbite, and Bolton's ratios. The unpaired -test and Pearson's correlation coefficient test were used for data analysis.
RESULTS
No statistical gender differences were reported in all measurements except the dental arch widths and length where males had significantly higher mean values. Only the maxillary incisor's inclination showed a direct weak significant correlation with the total arch length.
CONCLUSIONS
The inclination of upper incisors had a minimal effect on increasing dental arch length.
Topics: Adult; Dental Arch; Dental Occlusion; Female; Humans; Male; Maxilla; Tooth; Young Adult
PubMed: 34650346
DOI: 10.1155/2021/8993734