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American Journal of Orthodontics and... Mar 2008The aim of this study was to analyze the relationship between the circumpubertal phases of the dentition (early mixed, intermediate mixed, late mixed, early permanent)...
INTRODUCTION
The aim of this study was to analyze the relationship between the circumpubertal phases of the dentition (early mixed, intermediate mixed, late mixed, early permanent) and skeletal maturity as assessed by means of the cervical vertebral maturation (CVM) method.
METHODS
The sample of 1000 subjects included 250 (125 boys, 125 girls) in each of the 4 dentition phases. Individual skeletal maturity was determined by using the CVM method. The relationship between the skeletal maturity (stages in CVM) and the phases of the dentition was evaluated statistically by means of indicators of diagnostic test performance.
RESULTS
Prepubertal stage 1 (CS1) was the variable diagnosed in the early mixed and intermediate mixed dentitions; pubertal stage 3 (CS3) was the variable diagnosed in the late mixed and early permanent dentitions.
CONCLUSIONS
The early mixed dentition phase showed a strong diagnostic value for the identification of prepubertal skeletal maturity (CS1), whereas the intermediate mixed dentition phase had a low diagnostic value for the same prepubertal stage. Neither the late mixed dentition nor the early permanent dentition appeared to be a valid indicator for the onset of the pubertal growth spurt.
Topics: Age Determination by Skeleton; Age Determination by Teeth; Cervical Vertebrae; Child; Cross-Sectional Studies; Dentition, Mixed; Dentition, Permanent; Female; Humans; Likelihood Functions; Male; Puberty; Sensitivity and Specificity
PubMed: 18331939
DOI: 10.1016/j.ajodo.2006.02.040 -
The Journal of Prosthetic Dentistry Jul 2020Consensus is lacking regarding the influence of the maxillary dentition on the survival rate of a mandibular metal-resin implant-supported fixed complete denture... (Meta-Analysis)
Meta-Analysis
Does the natural maxillary dentition influence the survival rate of mandibular metal-resin implant-supported fixed complete dentures? A systematic review and meta-analysis.
STATEMENT OF PROBLEM
Consensus is lacking regarding the influence of the maxillary dentition on the survival rate of a mandibular metal-resin implant-supported fixed complete denture (MRISFCD) with distal cantilevers.
PURPOSE
The purpose of this systematic review was to identify whether an opposing natural dentition influences the survival rate of mandibular MRISFCDs.
MATERIAL AND METHODS
A literature search was performed up to February 2018 from MEDLINE/PubMed, Scopus, Web of Science, Cochrane Library, BBO/LILACS databases and also in the non-peer-reviewed literature through Open Grey. Clinical studies regarding natural (ND), removable prostheses (RP), and complete fixed maxillary implant dentitions (ID) with at least a year of follow-up were included. The quality of the included studies was analyzed, and the risk of bias was reported. A meta-analysis comparing the survival rate of ND with RP and ND with ID was performed with a confidence interval (CI) of 95%, and heterogeneity was tested by an I index. Grading of Recommendations, Assessment, Development, and Evaluation (GRADE) approach was used to determine the certainty of the evidence.
RESULTS
From a total of 112 ND, 69 ID, and 204 RP in the maxillary dentition, the overall prevalence of failures was 5.4% (6/112; 95% CI [2.3 to 10.76]) for ND, 13.99% (20/69; 95% CI [0.77 to 39.41]) for ID, and 4.9% (10/204; 95% CI [0.69 to 12.18]) for RP. No statistical differences were detected in the success rates between ND and RP (risk difference = 0.00 [-0.06, 0.06]; P=.93; I=27%) or between ND and ID (risk difference=0.00 [-0.06, 0.07]; P=.97; I=0%), both with moderate evidence.
CONCLUSION
With a moderate certainty of evidence, it is suggested that natural maxillary dentitions do not affect the survival rate of mandibular MRISFCDs differently from other prosthetic designs.
Topics: Dental Implants; Dental Prosthesis, Implant-Supported; Dentition; Denture, Complete; Metals; Survival Rate
PubMed: 31753454
DOI: 10.1016/j.prosdent.2019.06.018 -
Romanian Journal of Morphology and... 2023The first permanent molar (FPM) is the first tooth in the permanent dentition that emerges in the oral cavity, at around the age of six and behind the deciduous teeth,...
BACKGROUND
The first permanent molar (FPM) is the first tooth in the permanent dentition that emerges in the oral cavity, at around the age of six and behind the deciduous teeth, thus converting the primary dentition into a mixed dentition. Its early formation represents a risk factor for the onset of hard dental tissues disorders, the most common being the molar incisor hypomineralization (MIH).
AIM
The aim of the study was to assess the hypomineralization type of developmental defects of enamel at FPM level during the mixed dentition stage, in a group of Romanian children.
PATIENTS, MATERIALS AND METHODS
The research was conducted on 87 patients, 44 females and 43 males, divided into the following age groups: 5-6 years, 6-7 years, 7-8 years, 8-9 years, 9-10 years, 10-11 years, 11-12 years and older than 12 years. All children were examined in the dental office by a pediatric dentist.
RESULTS
Of the subjects, 40.2% presented hypomineralization lesions on the FPM. Among the affected children, 62.9% were girls and 37.1% were boys. Mild forms were the most prevalent, being found in 71.4% of the affected subjects. Moderate forms were present in 22.9% and severe forms in 5.7% of the affected children. MIH prevalence significantly decreased with increasing age. Only two children belonging to the group 8-9 years and 10-11 years, respectively, showed severe MIH lesions. Statistically significant differences were determined in what regards the distribution of MIH children according to the severity of the lesions in relation to age (p=0.007).
CONCLUSIONS
Children 6- to 7-year-old have been the most affected by FPM hypomineralization, which indicates the need for early management of the disease, through a thorough diagnosis, and preventive and interceptive therapeutic approaches.
Topics: Male; Child; Female; Humans; Child, Preschool; Incisor; Dentition, Mixed; Molar; Dentition, Permanent; Prevalence; Dental Enamel
PubMed: 37518882
DOI: 10.47162/RJME.64.2.15 -
Head & Face Medicine May 2020In-vivo accuracy of intraoral scans of complete mixed dentitions of patients in active treatment have not yet been investigated. The aim was to test the hypothesis that... (Clinical Trial)
Clinical Trial Comparative Study
OBJECTIVE
In-vivo accuracy of intraoral scans of complete mixed dentitions of patients in active treatment have not yet been investigated. The aim was to test the hypothesis that dimensional differences between intraoral scans and conventional alginate impressions in the mixed dentition are clinically irrelevant.
METHODS
Trial design: Prospective non-randomized comparative clinical trial. Based on sample size calculation 44 evaluable mixed dentition jaws of patients in active orthodontic treatment were included. Each patient received an alginate impression following an intraoral scan (TRIOS® Ortho). Plaster cast was fabricated and scanned with an external scanner (ATOS-SO®). Both STL datasets were analyzed with the 3D inspection and mesh processing software GOM Inspect®. Statistical analysis comprised sample size calculation, t-test as well as nonparametric tests.
RESULTS
The absolute mean difference between digital plaster casts and intraoral scans is 0.022 mm ± 0.027 mm (median 0.015 mm). The obtained measurements are in the range of comparable studies on full arch permanent dentitions. Gender, the size of the jaw represented by the dentition stage and upper respectively lower jaw, as well the malocclusion have no effect on the total deviations between digital plaster casts and intraoral scans. Detectable impression errors were bubbles in fissures and marginal ridges as well as incomplete alginate flow and detachment from the tray. Detectable scanning errors were incomplete distal surface of the most distal molar.
CONCLUSION
Dimensional differences between intraoral scans and conventional alginate impressions in the mixed dentition are clinically irrelevant for orthodontic purposes. In all clinical situations of active treatment in the mixed dentition, the intraoral scans are more detailed and less error-prone.
Topics: Computer-Aided Design; Dental Impression Technique; Dentition, Mixed; Female; Humans; Imaging, Three-Dimensional; Male; Models, Dental; Prospective Studies
PubMed: 32430023
DOI: 10.1186/s13005-020-00222-6 -
Bio-medical Materials and Engineering 2022Most orthodontic cases consist of varying degrees of crowding. To manage crowded dentitions, nickel-titanium archwires with various ligation methods are often used.
Influence of different ligation methods on force and moment generation in a simulated condition of the maxillary crowded anterior dentition with linguo-version and rotation.
BACKGROUND
Most orthodontic cases consist of varying degrees of crowding. To manage crowded dentitions, nickel-titanium archwires with various ligation methods are often used.
OBJECTIVE
We aimed to investigate the effect of different ligation methods with respect to force and moment and suggest the efficient ligation method for treating rotation and displacement simultaneously.
METHODS
We built a model that simulated the three anterior teeth of the maxilla. The teeth on the two ends were fixed, and the middle tooth was set in several different positions by manipulating the amount of displacement in bucco-lingual direction and rotation angle. The measurements were taken with three different ligation methods of self-ligation (SL), elastomeric o-ring ligation on both side wings (EB), and on one side wings (EO).
RESULTS
The magnitude of linguo-buccal force exceeded the standard optimal force in each condition examined and was significantly larger in EB than in other ligation methods. Moreover, the magnitude of moment generation with SL was suitable in the 0.0 mm linguo-version, whereas it was suitable with EO in the linguo-version ranging 1.0-3.0 mm.
CONCLUSIONS
The ligation method significantly affected the force and moment. SL and EO are recommended in dentitions with light and deep lingual displacements, respectively.
Topics: Maxilla; Orthodontic Wires; Orthodontic Appliance Design; Tooth Movement Techniques; Orthodontic Brackets; Dentition; Rotation; Incisor
PubMed: 35662100
DOI: 10.3233/BME-211288 -
American Journal of Physical... Sep 1969
Topics: Adolescent; Arabia; Bicuspid; Cephalometry; Cuspid; Dentition; Ethnicity; Female; Humans; Incisor; Israel; Male; Molar; Tooth
PubMed: 5348796
DOI: 10.1002/ajpa.1330310209 -
Folia Primatologica; International... 1995A recent discussion of the anterior teeth of adapids led to the conclusion that similarities to anthropoids are convergent. It is shown here that alternative functional...
A recent discussion of the anterior teeth of adapids led to the conclusion that similarities to anthropoids are convergent. It is shown here that alternative functional and phylogenetic interpretations can be supported. These alternative interpretations are based on a different perspective on the anterior dentitions of extant and fossil anthropoids, which cannot be characterized by a single pattern of morphology and occlusion. More importantly, when this interspecific variation is placed within a phylogenetic framework it reveals persistent evolutionary trends that can be extrapolated back to infer a modest range of probable conditions in an Eocene anthropoid ancestor. The morphology and occlusion of adapid anterior teeth fall within this extrapolated range. This is compatible with an adapid ancestry for anthropoids.
Topics: Alouatta; Animals; Bicuspid; Cuspid; Dentition; Female; Fossils; Haplorhini; Male; Mandible; Maxilla; Phylogeny; Saimiri
PubMed: 8707232
DOI: 10.1159/000156872 -
Journal of Prosthodontics : Official... Apr 2021To evaluate the effect of different residual dentitions on the dynamic adjustment of wear facet morphology on a single mandibular first molar crown with a virtual...
PURPOSE
To evaluate the effect of different residual dentitions on the dynamic adjustment of wear facet morphology on a single mandibular first molar crown with a virtual articulator.
MATERIALS AND METHODS
Gypsum casts (N = 12) of natural full dentitions were mounted on an articulator and scanned. The mandibular right first molar (#46) was prepared and a copy of the tooth before it was prepared and used to design the crown. The wear facets on the original #46 were selected and elevated by 0.3 mm in the occlusal direction to generate high points. The #46 with high points was segmented to create a digital wax pattern. Then different teeth were virtually removed to generate 4 types of residual dentitions: Type I (no teeth), Type II (adjacent teeth), Type III (ipsilateral posterior teeth and canine), and Type IV (all teeth). The crowns were adjusted dynamically with different residual teeth to guide mandibular movement of the virtual articulator. Three-dimensional deviations, negative and positive volumes between crowns and wear facets on the original #46 were analyzed. The Kruskal-Wallis test was used to analyze the results.
RESULTS
The mean deviation values and positive volumes decreased with the decrease in residual teeth, and the negative volumes showed an opposite trend. The mean deviation values, root mean square, and positive volumes were not significantly different. The negative volume of the crowns of Type I was different from that of Type IV (p = 0.031).
CONCLUSIONS
Residual dentition affects the dynamic adjustment of wear facet morphology. When there are insufficient residual teeth, mandibular movements should be accurately measured.
Topics: Crowns; Dentition; Molar; Tooth; Tooth Crown
PubMed: 33210775
DOI: 10.1111/jopr.13290 -
Archives of Oral Biology Apr 1973
Topics: Animals; Dental Arch; Dentition; Gestational Age; Incisor; Mandible; Maxilla; Molar; Rabbits; Radiography; Tooth Eruption; Tooth Exfoliation; Tooth Resorption; Tooth Root; Tooth, Deciduous
PubMed: 4516064
DOI: 10.1016/0003-9969(73)90072-1 -
American Journal of Orthodontics Nov 1947
Topics: Dentition; Dentition, Mixed; Humans; Tooth, Unerupted
PubMed: 20272162
DOI: 10.1016/s0096-6347(47)90073-2