Bahman Seraj; Mandana Tosifian; Sara Ghadimi; Mohammad Javad Kharrazifard
Abstract
Background: Tooth size is an important factor that affects alignment of the teeth in the dental arch and occlusion development during dentition transition.
Objectives: This study was carried out to measure mesiodistal dimensions of primary teeth to provide standard for the tooth size. Knowledge of such ...
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Background: Tooth size is an important factor that affects alignment of the teeth in the dental arch and occlusion development during dentition transition.
Objectives: This study was carried out to measure mesiodistal dimensions of primary teeth to provide standard for the tooth size. Knowledge of such a standard of tooth size is significant for a better analysis of the space and more appropriate planning of orthodontic treatments.
Patients and Methods: The current study was conducted on 32 children, aged 5.5 - 6.5 years, in late primary dentition. The dental casts were prepared and the tooth size was measured by a digital caliper. The obtained data were analyzed by ANOVA and t-test.
Results: The mesiodistal width of primary central incisor in the upper left quadrant was larger than those of the rest of quadrants. Also, the mesiodistal widths of primary lateral incisors in the upper left quadrant, primary canines in the upper left quadrant, primary fist molars in the lower right quadrant and primary second molars in the lower left quadrant were larger than those of the other quadrants. Moreover, it was concluded that the mesiodistal diameter of permanent central incisors could be obtained according to the primary central incisors using the formula: 1.12 × (Deciduous central incisor width) + 1.27 = (Permanent central incisor width).
Conclusions: The findings of this study can be used as a base and standard for the measurement of primary dentition in Iranian children. Also, measurement of mesiodistal width of deciduous central incisors can be used to predict the mesiodistal width of permanent central incisors.
Bahman Seraj; Jale Mahmoudiyan; Sara Ghadimi
Abstract
Aim: The premature loss of primary molars and the failure to protect this site during normal growth and developmental events may put the normal occurrence of occlusion at risk in the permanent dentition. Protection of dental arch relations in the premature loss of teeth can only be ensured with placement ...
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Aim: The premature loss of primary molars and the failure to protect this site during normal growth and developmental events may put the normal occurrence of occlusion at risk in the permanent dentition. Protection of dental arch relations in the premature loss of teeth can only be ensured with placement of space maintainers. The purpose of this study was to evaluate the clinical performance of Fiber Reinforced Composite resin(FRC) as a space maintainer.Materials and Method: This study was conducted on 24 children applying 34 space maintainers. Old restorations in buccal surface were removed and grooves in mesiodistal direction were prepared on the decalcified or carious buccal surface of the abutment teeth. Teeth surfaces were etched, rinsed and dried. The required length of fiber was cut and then saturated with a few drops of bonding agent. The fiber was placed and a flowable composite was applied on the prepared grooves and fiber. The patients were followed up for 12 months.Results: Our results showed that median survival time was 11.65 months and the success rate of FRC as a space maintainer was 88.24%. At the end of the study, there was no significant statistical difference between linear and angular measurements in initial and final casts (P>0.05).Conclusion: This study revealed that FRC can be an appropriate substitute appliance in preserving the space of the premature loss of primary teeth to prevent space loss.
Bahman Seraj; Hoorieh Bashizadeh; Arghavan Tonkaboni; Mohsen Shirazi
Abstract
Background and Aim: Assessment of skeletal maturity is an integral part of interceptive diagnosis and treatment planning. The present method of skeletal maturity assessment like handwrist or cervical vertebrae radiographies are expensive, require elaborate equipment and account for high radiation exposure, ...
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Background and Aim: Assessment of skeletal maturity is an integral part of interceptive diagnosis and treatment planning. The present method of skeletal maturity assessment like handwrist or cervical vertebrae radiographies are expensive, require elaborate equipment and account for high radiation exposure, especially for growing children. This study tried to consider the value of the 2nd primary molar in growth stage.
Material and Method: 40 samples aged 8-13 were tested by their panoramic and handwrist radiographs.
Result and Conclusion: there was a coincidence between presence calcified sesamoid and 2nd primary molar as the last tooth. The result showed that it could be a reliable index to predict the growth stage in 1st visit without radiography. (IJO 2006; 1: 58 - 60)
