Age- and gender-related incisor changes in different vertical craniofacial relationships

Linjawi, Amal I

doi:10.4103/2278-0203.192116

Cited by 11 publications

(7 citation statements)

References 25 publications

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“…Linjawi A. I. [12,13] in the examination of 210 patients aged 11-15 years and subsequent statistical data processing found strong correlations between the state of molar health and such indicators as sex, vertical growth pattern and overbite, but no correlations with cephalometric indicators. Similar data were also obtained by a group of Indian researchers [16].…”

Section: Discussionmentioning

confidence: 99%

Correlations of linear sizes of molars with cephalometric indicators of practically healthy men of the southern region of Ukraine

Soboń¹,

Cherkasova²,

Gunas³

et al. 2020

Biomed. and Biosoc. Anthrop.

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The high prevalence of pathologies of the dental and tooth-jaw system both in Ukraine and abroad requires scientists to search for new, fundamental discoveries, in particular, to identify patterns of the relationship between cephalometric and odontometric indicators within certain ethnic populations. The purpose of the study is to establish the features of the correlations of computed tomography sizes of molars with cephalometric parameters of practically healthy men in the southern region of Ukraine. 33 practically healthy men of the first mature age, inhabitants of the southern region of Ukraine (from Mykolayiv, Kherson, Odesa, Zaporizhia regions and the Autonomous Republic of Crimea) underwent cephalometry and cone-beam computed tomography followed by odontometry of molars. The correlations between odonto- and cephalometric parameters were assessed in the license package “Statistica 6.1” using non-parametric Spearman statistics. In almost healthy men of the southern region of Ukraine in the qualitative analysis of multiple nature, mostly direct reliable and medium unreliable correlations, found only between most sizes of molars on the lower jaw and the length and height of the nose. Quantitative analysis revealed the most significant correlations between computed tomography sizes of molars and face sizes (7.4 % on the upper jaw, most of which are inverse, and 13.2 % on the lower jaw, almost evenly straight and inverse). With the indicators of the skull, the relative majority of reliable, mostly inverse correlations are observed with the height of the teeth, their crowns and the length of the roots (on the upper jaw 11.4 %, on the lower jaw 5.4 %); and with indicators of the facial skull – almost evenly with the height of the teeth, their crowns and the length of the roots (on the upper jaw 6.4 %, on the lower jaw 14.6 %, in both cases mostly reverse) and with vestibular-lingual and mesio-distal dimensions (on the upper jaw 8.7 %, mostly reverse, on the lower jaw 11.8 %, mostly straight). The obtained results of correlation analysis of computed tomography sizes of molars with cephalometric indicators and indices confirm the population specificity of the features of the dental system and are necessary for the correct construction of regression models.

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Section: Discussionmentioning

confidence: 99%

Correlations of linear sizes of molars with cephalometric indicators of practically healthy men of the southern region of Ukraine

Soboń¹,

Cherkasova²,

Gunas³

et al. 2020

Biomed. and Biosoc. Anthrop.

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“…There were no statistically significant differences between normal-angle and high-angle patients regarding the sagittal jaw relationship. Interestingly, Linjawi [ 24 ] noticed that only patients with a decreased skeletal vertical dimension presented changes in the inclination and position of the lower incisors related to age and gender.…”

Section: Discussionmentioning

confidence: 99%

Personalized Orthodontics: From the Sagittal Position of Lower Incisors to the Facial Profile Esthetics

Derwich¹,

Minch²,

Mituś-Kenig

et al. 2021

JPM

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Background: One of the goals of orthodontic treatment is to obtain maximum facial harmony. The sagittal position of the lower incisors plays a significant role in the planning of orthodontic treatment. The aim of the study was to evaluate the relationship between the sagittal position of lower incisors and facial profile esthetics with reference to the skeletal vertical dimension. Methods: There were 200 patients included in the study. Patients were allocated into three groups, depending on the vertical growth pattern: normal-angle, low-angle, and high-angle cases. Tweed–Merrifield cephalometric analysis was used to assess the sagittal and vertical position of the mandible, as well as to assess the sagittal position of the lower incisors. Results: Z-angle and Frankfort mandibular incisor plane angle (FMIA) decreased significantly (p < 0.001) with the increase of the skeletal vertical dimension. Incisor mandibular plane angle (IMPA) was significantly higher (p < 0.001) in low-angle patients compared to the high-angle ones. Z-angle appeared to be the most accurate parameter (area under curve, AUC = 0.957) describing patients with a convex profile. The cutoff value of Z-angle 68.0° was characterized by the sensitivity of 94.1% and the specificity of 84.3%. Conclusions: The sagittal position of the lower incisors significantly affects the facial profile convexity. The Z-angle is the parameter which most accurately describes the patients with a convex profile.

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“…Considering the change in hyoid bone position, Matsuda et al 33 stated hyoid bone shifted to a posterior, rotated, and lower position with increasing age in their cross sectional study using lateral cephalometric radiographs in 22 to 84 years old patient. Agelower incisor position relationship was evaluated by Linjawi's study 34 and the author argued that age-and gender-related lower incisor changes significant only in subjects with brachifacial pattern. Present study was focused head posture, hyoid bone, tongue position and lower incisor inclination instead of vertical growth pattern.…”

Section: Discussionmentioning

confidence: 99%

Lower Incisor Inclination in Relation to Head Posture, Tongue and Hyoid Positions

Akan

Keçik

2019

Cumhuriyet Dental Journal

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Objectives: To investigate the relationship between head posture, hyoid bone, tongue position and lower incisor inclination. Materials and Methods: The study sample consisted of 98 subjects (35 males, 63 females), who had a mean age of 17.7 years in the permanent dentition and with a skeletal Class I relationship. Lower incisor inclination, craniovertical, craniocervical and craniohorizontal postural variables, tongue and hyoid position and airway measurements were evaluated on lateral cephalograms taken in natural head position. The study sample was divided into two groups according to lower incisor inclination (48 had IMPA<90 with a mean degree of 88.09 and 50 had IMPA>90 with a mean degree of 102.84) and a Student-t test was performed to compare and describe head posture, tongue and hyoid bone positions. Results: The subjects with upright incisors had a more posteriorly positioned hyoid bone relative to the mandibular symphysis compared with the subjects with flared incisors (p<0.05). Tongue length was greater in the flared incisor group than in the upright incisor group (p<0.05). In relation to head posture measurements, the upright incisor group had 3-3.5° larger cranio-cervical angles (NSL-OPT, NSL-CVT, NL-OPT, NL-CVT angles, p<0.05) than the flared incisor group. The airway measurements revealed no statistically significant difference between the groups. Conclusions: The position of the hyoid bone, tongue length and craniocervical head posture showed significant differences between upright and flared lower incisors.

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Age- and gender-related incisor changes in different vertical craniofacial relationships

Cited by 11 publications

References 25 publications

Correlations of linear sizes of molars with cephalometric indicators of practically healthy men of the southern region of Ukraine

Correlations of linear sizes of molars with cephalometric indicators of practically healthy men of the southern region of Ukraine

Personalized Orthodontics: From the Sagittal Position of Lower Incisors to the Facial Profile Esthetics

Lower Incisor Inclination in Relation to Head Posture, Tongue and Hyoid Positions

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