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British Dental Journal Jul 2017Aims Dental practitioners may hold the view that missing posterior teeth should be replaced to ensure a healthy masticatory system and satisfactory oral function.... (Review)
Review
Aims Dental practitioners may hold the view that missing posterior teeth should be replaced to ensure a healthy masticatory system and satisfactory oral function. However, the shortened dental arch (SDA) concept is still in use, but after 35 years is it acceptable? This review searches the literature for the evidence and opinions regarding the suitability of the SDA as a current treatment modality.Methods Medline and PubMed databases were searched for relevant terms, all the abstracts were assessed and articles selected according to the pre-set exclusion and inclusion criteria.Results The search yielded 1,895 articles and after the assessment of the abstracts and application of the exclusion and inclusion criteria, 44 articles were selected for this review. These included 11 cohort studies, two longitudinal studies, two animal studies, three cross sectional studies, eight clinical studies and 18 case control studies. There appears to be a trend over the past three decades for more papers to be opposed to the SDA concept.Conclusion Evidence that the SDA causes pathology is lacking. Clinicians, healthcare authorities and patients have shown favourable attitudes towards the SDA and this continues, although there is an increase in studies opposing the concept and some are dissatisfied with this option. The concept remains viable particularly for the medically compromised patient or where restorations are considered unsuitable but further more specific studies are warranted.
Topics: Attitude of Health Personnel; Dental Arch; Dentistry; Humans; Tooth Loss
PubMed: 28729593
DOI: 10.1038/sj.bdj.2017.625 -
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 -
Medicine Sep 2016Children with severe airway obstruction tend to have a vertical direction of growth, class II malocclusion, and narrow arches. Adenoidectomy and tonsillectomy were... (Meta-Analysis)
Meta-Analysis Review
BACKGROUND
Children with severe airway obstruction tend to have a vertical direction of growth, class II malocclusion, and narrow arches. Adenoidectomy and tonsillectomy were recommended for the promotion of balanced dentition growth in these children.The aim of this study was to determine the effect of adenoidectomy and tonsillectomy on the growth of dental morphology in children with airway obstruction.
METHODS
A comprehensive search of the Medline, Embase, Web of science, and OVID databases for studies published through to January 17, 2016 was conducted. Prospective, comparative, clinical studies assessing the efficacy of adenoidectomy, or tonsillectomy in children with airway obstruction were included. The weighted mean difference (WMD) and 95% confidence interval (CI) were used for continuous variables. Forest plots were drawn to demonstrate effects in the meta-analyses.
RESULTS
Eight papers were included in our study. We found that adenoidectomy and tonsillectomy led to a significant change in nasal-breathing in children with airway obstruction. Children with airway obstruction had a significantly narrower posterior maxillary dental arch than children without airway obstruction (WMD = -0.94, 95% CI [-1.13, -0.76]; P < 0.001). After surgery, these children still had a significantly narrower dental arch than the nasal-breathing children (WMD = -0.60, 95% CI [-0.79, -0.42]; P < 0.001). In terms of dental arch width, malocclusion, palatal height, overjet, overbite, dental arch perimeter, and arch length, a tendency toward normalization was evident following adenoidectomy or tonsillectomy, with no significant differences evident between the surgical group and the normal group. The small number of studies and lack of randomized controlled trials were the main limitations of this meta-analysis.
CONCLUSIONS
Following adenoidectomy and tonsillectomy, the malocclusion and narrow arch width of children with airway obstruction could not be completely reversed. Therefore, other treatments such as functional training or orthodontic maxillary widening should be considered after removing the obstruction in the airway.
Topics: Adenoidectomy; Adolescent; Airway Obstruction; Child; Child, Preschool; Dental Arch; Female; Humans; Male; Malocclusion; Postoperative Period; Tonsillectomy; Treatment Outcome
PubMed: 27684847
DOI: 10.1097/MD.0000000000004976 -
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 -
Nederlands Tijdschrift Voor... Sep 2018The question addressed by this doctoral research was whether the concept of the shortened dental arch has become an obsolete treatment therapy. To answer this question,... (Review)
Review
The question addressed by this doctoral research was whether the concept of the shortened dental arch has become an obsolete treatment therapy. To answer this question, a systematic review of literature concerning the oral health related quality of life of people with a shortened dental arch was carried out, a questionnaire among people with and without a shortened dental arch was employed to determine the longevity and clinical outcomes of shortened dental arches and finally, semi-structured interviews were conducted to assess perceptions and attitudes regarding absent molars and prostheses. The conclusion is that in certain situations the shortened dental arch concept is still valid. Patients with a shortened dental arch experience an oral health related quality of life comparable to people with a full dental arch and a shortened dental arch can function well for up to 30 years or more. During the joint decision-making process about whether to apply the shortened dental arch concept, it is important to address the underlying issues involved in having or treating a shortened dental arch.
Topics: Decision Making; Dental Arch; Humans; Mastication; Oral Health; Quality of Life
PubMed: 30221642
DOI: 10.5177/ntvt.2018.09.18182 -
Scientific Reports Dec 2019This study aimed to investigate changes in types of dental arch form during adolescence and explore adolescent changes in size and form of dental arch. Hong Kong Chinese...
This study aimed to investigate changes in types of dental arch form during adolescence and explore adolescent changes in size and form of dental arch. Hong Kong Chinese were recruited and digital dental arch models were obtained at ages 12, 15, and 18 years. Geometric morphometrics was used to investigate adolescent changes of dental arch form. There were 225 participants from whom digital models at all three age periods were available. Three types of dental arch form were identified through clustering. Significant changes (p < 0.001) in types of dental arch form were noted during age 12-18 years. During age 12-18 years, significant changes in centroid size and form of dental arch were observed (p < 0.001). No significant changes were observed during 15-18 years. Adolescent changes of dental arch form occur primarily during age 12-15 years, whereas dental arch form was relatively stable during age 15-18 years.
Topics: Adolescent; Adolescent Development; Age Factors; Cephalometry; Child; Dental Arch; Female; Hong Kong; Humans; Longitudinal Studies; Male; Prospective Studies
PubMed: 31811230
DOI: 10.1038/s41598-019-55073-2 -
The Angle Orthodontist Sep 2019To investigate the treatment efficacy and follow-up stability of the asymmetric Forsus appliance by evaluating longitudinal changes in dental arch asymmetry on digital...
OBJECTIVES
To investigate the treatment efficacy and follow-up stability of the asymmetric Forsus appliance by evaluating longitudinal changes in dental arch asymmetry on digital dental models from 21 patients.
MATERIALS AND METHODS
Maxillary and mandibular reference lines were used for measurements of intra-arch asymmetry at pretreatment (T1), posttreatment (T2), and 4.2 years after treatment (T3). Maxillary and mandibular measurements were performed relative to the dental midline and anterior reference line on digital dental models. To determine the amount of asymmetry between the Class I and Class II sides of a given arch, all maxillary and mandibular parameters were measured on each side of the model separately. Repeated-measures analysis of variance/paired sample -tests were performed to evaluate dental arch asymmetries at the < .05 level.
RESULTS
The alveolar transverse dimensions of the posterior segment of both arches were increased during treatment ( < .05) and remained stable during the retention period. Class II subdivision malocclusion was caused by distal positioning of the mandibular canine, premolars, and first molar on the Class II side ( < .05). Asymmetry was resolved by treatment with asymmetric Forsus appliances. The resolved asymmetry remained stable over the long term. There were no significant differences between T2 and T3 ( > .05).
CONCLUSIONS
The asymmetric Forsus appliance can be used to treat dental arch asymmetry in patients with Class II subdivision malocclusions.
Topics: Cephalometry; Dental Arch; Humans; Malocclusion, Angle Class II; Mandible; Maxilla
PubMed: 30920873
DOI: 10.2319/092718-697.1 -
The Angle Orthodontist Mar 2020The 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...
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 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 ( < .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.
Topics: Cleft Lip; Cleft Palate; Dental Arch; Humans; Maxilla; Palatal Expansion Technique
PubMed: 31469593
DOI: 10.2319/020219-74.1 -
L' Orthodontie Francaise Mar 2017A possible relation between an upper airway space decrease and the development of obstructive sleep apnea syndrom explains the importance to know the effect of the... (Review)
Review
INTRODUCTION
A possible relation between an upper airway space decrease and the development of obstructive sleep apnea syndrom explains the importance to know the effect of the modification of dental arch length on the upper airway during orthodontic treatment.
OBJECTIVES
The aim of this article is to expose recent knowledge about upper airway development and dental arch length decrease factors, to determine the influence of this decrease on upper airway development.
METHODS
A review was done to determine the upper airway normal development, to define dental arch to specify if an ideal position of dental arch on apical base exists. All of the length dental arch decrease factors during orthodontic treatment (dental extraction, dental agenesis and dental malpositions) and their upper airway resounding were searched.
RESULTS
Some authors found a diminution of upper airway space after premolars extractions while others didn't found this diminution after extractions premolars when incisor retraction is finished. A decrease of transversal maxillary diameter and nasal cavity may be due to absence of permanent teeth.
CONCLUSION
The effect of dental arch length decrease during orthodontic treatment in the upper airway development was not scientifically proved. However we had to be vigilant and adapt our orthodontic treatment case by case to avoid an upper airway modification.
Topics: Adult; Child; Dental Arch; Humans; Infant; Infant, Newborn; Orthodontics, Corrective; Respiratory System; Sleep Apnea Syndromes; Tongue Habits; Tooth Extraction
PubMed: 28229850
DOI: 10.1051/orthodfr/2016041 -
International Dental Journal Jun 1990Dental care should be aimed at the preservation of a natural functioning dentition for life, within the available resources. In general, preference should be given to... (Review)
Review
Dental care should be aimed at the preservation of a natural functioning dentition for life, within the available resources. In general, preference should be given to dentitions comprising complete dental arches or 14 occluding pairs of teeth. However, in many subjects--such as the elderly--this goal might be neither attainable nor necessary. In these cases, dental care should be aimed at preserving the strategic parts of the dental arch, which are the front and premolar regions (the so-called ultimate occlusal preservation target). Clinical observation as well as research findings indicate that elderly people can function at an acceptable level with a reduced dentition consisting of 10 or even fewer occluding pairs. The minimum size of a functional dental arch differs between individuals and depends on local and systemic factors. Important indicators are the age, the (periodontal) quality of the remaining dentition, the spatial relationship between the lower and upper teeth, the occlusal activity and the adaptive capacity. Dental health care systems should implement guidelines to concentrate the available resources primarily on the strategic regions of the dental arch, especially in high-risk groups. These guidelines should be based on research results. The main objective of this paper is to contribute to defining an acceptable oral status for elderly subjects.
Topics: Adult; Aged; Aged, 80 and over; Aging; Dental Arch; Health Services Needs and Demand; Humans; Jaw, Edentulous, Partially; Middle Aged; Oral Health
PubMed: 2194975
DOI: No ID Found