Occlusogram: Its Application to Cleft Palate Rehabilitation
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Abstract:
A camera loaded and mounted on one end of a fixed table was used to photograph dental study casts on a platform at the other end of the same table. These pictures were traced and analyzed for changes in arch form and dimensions.Keywords:
Table (database)
Dental arch
The purpose of this study was to compare dental arch size, mesiodistal and buccolingual crown widths, and crown shapes between 2 groups of children, 1 with anterior crowding in both dental arches and another with anterior spacing in both dental arches.Sixty-one sets (27 crowded and 34 spaced arches) of dental casts of normal occlusions were examined.For both lower and upper arches, crowded arches had statistically significantly smaller arch widths than did the spaced arches. The buccolingual width of the upper second primary molar of the crowded arches was statistically significantly larger than that of the spaced arches. However, there were little significant differences between crowded and spaced arches in arch length, mesiodistal crown width, and crown shape.It can be concluded that the factor that determines whether a primary dental arch is crowded is the absolute width of the arch.
Dental arch
Crowding
Mandibular arch
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Recently, beta function has been shown to be an accurate mathematical model of the human dental arch. In this article a beta function-based nomograph is presented that shows interrelationships between arch width, arch depth, and arch perimeter. This nomograph can be especially useful in predicting the effect of orthognathic surgery on these 3 variables of a dental arch.
Perimeter
Dental arch
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By using only a portion of the dental arch, rather than some geometric construction that conforms to the dental arch, more pertinent information can be gathered regarding the sequelae of some event or insult to the arch. The measurement, D E Space, has been explained and utilized to describe the effectss of unattended dental caries on arch form. Only caries which become severe have a significant effect on the dental arch--a reduction in D E Space, which can be interpreted as relative arch length (depth) and is significant only for the year after its exfoliation. This occurs one year early and is also significant.
Dental arch
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Dental arch
Ovoid
Mandibular arch
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Dental arch
Crowding
Permanent dentition
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Age changes in dental arch shape were assessed by computing the area of the arch and the arch index:Five-hundred and twenty sets of maxillary and mandibular casts were measured. They were taken from British patients within the age range of 3 to 15 years. The results showed that the dental arch areas increased maximally between S to 7 and 11 to 13 years. From examination of the indexes, however, the arches appeared to become broader with advancing age.
Dental arch
Mandibular arch
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This scrutiny assessed the dental arch dimensions and arch forms in a Niger Deltan population from Nigeria. The enquiry identified variations in tooth arch size. The inquiry compared the influence of gender on the dental parameters. This cross-sectional survey was done between February, 2021 and March, 2022. This study is a biometric analysis of dental casts of 206 subjects (104 males and 102 females) recruited from Teem Dental Clinic, Ekpan, Delta State, Nigeria. The dental arch sizes were determined. The proportions detailed are arch length, arch width, and arch form. The data were analyzed via the Statistical Package for the Social Sciences, version 22.0. Dental arch proportions (inter-canine width, inter-premolar width, inter-molar width and arch length) were lesser in females than in males. The Chucks arch form was considered in this scrutiny and the outcome was as follows: Tapered (49.5%), Ovoid (36.4%) and Square (14.1%). The dominant arch form was tapered, and the least common was square. Males mostly portrayed greater dental arch proportions than females.
Dental arch
Premolar
Scrutiny
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AIM: To investigate the human morphological evolution characteristics of lower dental arch by the measurement and comparison of the mandiblular arch shape of excavated samples with modern people in Xi'an City.METHODS: Forty well-preserved mandible samples of people living about 1,000 BC and those of modern people were selected.The existent length of dental arch,the length of dental arch,the length and width of anterior,middle and posterior segment of the dental arch were measured respectively.Data were analyzed with SPSS 13.0 for windows.RESULTS: The existent length of dental arch and the width of posterior segment of the dental arch of people of 1,000 years BC were larger than those of the modern people.There was no significant difference in all the other morphological indexes,including the length of dental arch,the length of anterior,middle and posterior segments of dental arch,the width of anterior and posterior segments of dental arch.CONCLUSION: No uniform decreasingtrend of the whole lower dental arch was observed,although some parts of the mandible dental arch showed slightly decreasing tendency over 3000 years in Xi'an inhahitants.
Dental arch
Mandible (arthropod mouthpart)
Mandibular arch
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Dental arch length, width, and perimeter are considered to be important for the diagnosis and treatment of orthodontic cases. This study aimed to utilize dental arch width and length to create an equation for predicting dental arch perimeter.Sixty-seven pairs of study models for patients with normal occlusion who received dental treatment were included in this study. Dental arch width at the level of the canines, first premolars, and first molars, in addition to dental arch length and perimeter, were measured using a digital vernier with 0.01mm accuracy. Data were subjected to step-wise regression analysis to determine the major predictors of arch perimeters and develop regression equations for both arches. The predicted arch perimeters were compared with the actual measured values using paired sample t-test.For both arches, the perimeter showed a direct, moderate to strong, highly significant correlation with the length and width measurements. Findings from step-wise regression analysis indicated that there was a strong correlation between arch perimeter and the inter-canine width and arch length, which explained 67.7% of the variation in arch perimeter in the maxillary arch. In the mandibular arch, inter-molar width, inter-canine width, and arch length explained 55.1% of the variation in the dental arch perimeter. The arch perimeter values predicted from the developed equations were not significantly different from the actual values that were measured.New regression equations based on dental arch width and length at the level of the premolars, molars, and canines were developed to predict dental arch perimeters for both the mandibular and maxillary arches.
Perimeter
Dental arch
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