Prevalence and patterns of tooth agenesis in Angle Class II Division 2 malocclusion in Japan

Ota, Kanako; Arai, Kazuhito

doi:10.1016/j.ajodo.2015.02.023

Cited by 18 publications

(8 citation statements)

References 24 publications

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“…In the past few years, some studies have evaluated the association between specifics craniofacial patterns and non-syndromic tooth agenesis [ 8-18 ], however, the results pertaining to skeletal malocclusions with tooth agenesis are controversial. Some authors did not find a significant association between tooth agenesis and malocclusions [ 10 , 15 , 18 ], while other authors observed association or tendency with skeletal Class II malocclusion [ 13 , 14 , 16 ]. On the other hand, other studies observed that tooth agenesis is associated or tendency with skeletal Class III malocclusion [ 8 , 9 , 11 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

Association between Tooth Agenesis and Skeletal Malocclusions

Costa

Trevizan

Matsumoto

et al. 2017

JOMR

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ObjectivesThe aim of this study was to evaluate the association between tooth agenesis and skeletal malocclusions in Brazilian non-syndromic orthodontic patients.Material and MethodsPretreatment orthodontic records of 348 patients of both genders and with various skeletal malocclusions were examined. Tooth agenesis was evaluated in panoramic radiographs. Angular measurements were taken from lateral cephalometric radiographs to classify the patient’s malocclusion as skeletal Class I, Class II and Class III. Subjects were divided into 2 groups, “with tooth agenesis” and “without tooth agenesis”. Chi-square or Fisher exact test was used to compare categorical data. ANOVA with Tukey’s post-test was used for means comparisons. An alpha of 5% was established. ResultsFrom 348 analysed patients, 28 presented tooth agenesis. There was no difference between genders (P = 0.27) nor mean age (P = 0.16). The most prevalent skeletal malocclusion was Class I (63.11%), followed by Class II (25.94%), and Class III (10.95%). The mean of congenitally missing teeth was 1.3 (SD 0.13). Thirteen subjects had premolar agenesis, 13 upper lateral incisor agenesis, 4 lower incisor agenesis and 2 molars agenesis. The group with tooth agenesis presented A point-nasion-B point (ANB) angle smaller (1.66 [SD 2.52]) than the group without tooth agenesis (2.86 [SD 2.49]) (P = 0.01). ANB angle had a negative correlation with the number of congenitally missing teeth (P = 0.039; r = -0.39).ConclusionsTooth agenesis is associated with a smaller A point-nasion-B point angle and is negatively correlated with the number of congenitally missing teeth.

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Section: Introductionmentioning

confidence: 99%

Association between Tooth Agenesis and Skeletal Malocclusions

Costa

Trevizan

Matsumoto

et al. 2017

JOMR

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“…Some investigators have shown that the prevalence rate of M3 agenesis is higher in the mandible than in the maxilla (1,3,4), whereas others have indicated that the contrary is the case (5)(6)(7)(8).…”

Section: Introductionmentioning

confidence: 99%

Symmetrical agenesis of the mandibular third molars and agenesis of other teeth in a Japanese orthodontic population

Hirakata

Sanpei

et al. 2016

Journal of Oral Science

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This study was conducted to investigate the association between symmetrical agenesis of the mandibular third molars and agenesis of other teeth in Japanese orthodontic patients. A sample of 64 patients with symmetrical agenesis of the mandibular third molars and without agenesis of the maxillary third molars was selected as the third molar agenesis group. In addition, 585 patients with all 4 third molars were selected as controls. The main materials examined for diagnosis of tooth agenesis were panoramic radiographs. The prevalence rate of tooth agenesis was compared between the groups using the chi-squared or Fisher's test, and the odds ratio. Significantly increased occurrence of overall agenesis of the maxillary lateral incisors, and overall and symmetrical agenesis of other teeth including the maxillary and mandibular second premolars and mandibular first molars were observed in the patients with symmetrical agenesis of the mandibular third molars and without agenesis of the maxillary third molars. Irrespective of the presence or absence of symmetrical agenesis of the mandibular third molars, no significant differences in the prevalence rates of overall or symmetrical agenesis of other teeth and specific teeth were noted between the sexes or between the right and left sides of the jaws in the patients without maxillary third molar agenesis. (J Oral Sci 58, 171-176, 2016) Keywords: tooth agenesis; symmetrical agenesis of the mandibular third molars; incisor agenesis; second premolar agenesis; first molar agenesis.

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“…For example, a significantly higher prevalence of third molar agenesis was found in the Class II Division 2 group in Japan. [ 31 ]…”

Section: Discussionmentioning

confidence: 99%

The relationship between agenesis of third molar and craniofacial morphology in orthodontic patients

Moghadam¹,

Etemadi²,

Akbari³

2018

J Int Soc Prevent Communit Dent

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Aims and Objectives:The aim of this study was to evaluate the association between third molar agenesis and craniofacial morphology in a group of Iranian orthodontic patients.Materials and Methods:A total of 164 high-quality lateral cephalograms and panoramic radiographs were included in the study. Eighty-two radiographs with the absence of at least one-third molar were assigned to agenesis group and other 82 radiographic records were served as control group. Cephalometric analysis was performed, and the results were compared between the two groups using Independent Samples Student's t-test.Results:Significant differences were found in SNA, ANB, sum of posterior angles, and lower gonial angle between the study groups. All of them were smaller in the agenesis group.Conclusion:Third molar agenesis in this group of Iranian subjects is associated with deficient maxillary development and brachyfacial and hypodivergent skeletal pattern.

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Prevalence and patterns of tooth agenesis in Angle Class II Division 2 malocclusion in Japan

Cited by 18 publications

References 24 publications

Association between Tooth Agenesis and Skeletal Malocclusions

Association between Tooth Agenesis and Skeletal Malocclusions

Symmetrical agenesis of the mandibular third molars and agenesis of other teeth in a Japanese orthodontic population

The relationship between agenesis of third molar and craniofacial morphology in orthodontic patients

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