• Journal of Dental Rehabilitation and Applied Science
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• v.32 no.1
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• pp.8-15
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• 2016

Purpose: The purpose of this research is to determine whether pontic metal substructures, which are currently used in clinical surgeries, are designed appropriately and identify the problems that can occur due to their shape, size, and position. Then it aimed to emphasize the importance of making and designing pontic metal substructures based on basic principles. Materials and Methods: This research measured pontic basal surface (P1) used sample metal substructures in this study, gingiva margin (P2), and the porcelain thickness of maximum infrabulge of labial surface around 1/3 of cervix dentis (P3). One-way ANOVA analysis was carried out to test the differences among groups, Tukey Honestly Significant Difference Test was conducted for statistical analysis among groups. Results: For porcelain thickness and SD value, the P1 part was $1.2-1.8({\pm}0.17)mm$ for experimental group 1, $1.2-1.7({\pm}0.17)mm$ for experimental group 2, and $0.4-2.8({\pm}0.92)mm$ for experimental group 3. Next, the P2 part was $1.4-1.6({\pm}0.07)mm$ for experimental group 1, $1.3-1.8({\pm}0.07)mm$ for experimental group 2, and $0.5-2.7({\pm}0.67)mm$ for experimental group 3. The P3 part was $1.4-1.7({\pm}0.10)mm$ for experimental group 1, $1.5-2({\pm}0.10)mm$ for experimental group 2, and $0.9-3.1mm({\pm}0.90)$ for experimental group 3. There was no significance when One-way ANOVA analysis/Tukey Honestly Significant Difference Test was conducted for statistical analysis among groups (P > 0.05). Conclusion: The suggested metal substructures can be used clinically as they meet the requirements that pontic must have.

• The korean journal of orthodontics
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• v.37 no.3 s.122
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• pp.220-230
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• 2007

Objective: The purpose of this study was to determine the changes of mandibular anterior alveolar bone thickness with age. Methods: Cephalometric radiographs of 160 skeletal class I patients (male 80, female 80) with normal vertical growth pattern was investigated by measuring the buccolingual thickness of mandibular alveolar bone on the basis of root axis. Results: As the age increases, both male and female showed a significant decrease in buccolingual width of the mandibular anterior alveolar bone and in the width of mandibular anterior lingual alveolar bone except the CEJ area of females. However, there was no significant difference in the thickness of mandibular anterior buccal alveolar bone and in the width of maximum prominence of mandibular symphysis with age. Conclusion: From the above results, it is concluded that Korean children whose growth pattern is sagittally skeletal class l with a vertical normal growth pattern have a greater mandibular anterior lingual alveolar bone width than Korean adults; therefore, lingual movement of mandibular incisors, which is usually accompanied in extraction treatment, is considered to be more preferable in younger patients.