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| Author(s): |
Patrícia Bittencourt Dutra dos Santos
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | Bauru. |
| Institution: | Universidade de São Paulo (USP). Faculdade de Odontologia de Bauru (FOB/SDB) |
| Defense date: | 2014-09-12 |
| Examining board members: |
Daniela Gamba Garib Carreira;
Ana Lúcia Pompéia Fraga de Almeida;
Flavia Raposo Gebara Artese;
Jose Fernando Castanha Henriques;
Fabio Henrique de Sá Leitão Pinheiro
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| Advisor: | Daniela Gamba Garib Carreira |
| Abstract | |
Objective: The aim of this study was to evaluate the buccal and lingual bone plate thickness measurements and dehiscences of mandibular second premolars and molars after orthodontic treatment in patients with loss of first permanent molar and to investigate periodontal parameters behavior. Methods: The sample comprised 36 hemiarchs which were divided into 3 groups: GA (15 uprighted molars), GF (12 molars that were moved to atrophic areas) and GC (control grup 9 molars aligned and leveled). Posttreatment CBCT exams of the mandible were taken with voxel dimensions of 0.2 mm using the i-CAT Cone-Beam 3-D Dental Imaging System. Linear measurements were performed using the Dolphin software on cross section slices. Dehiscences and bone plate thickness measurements at middle of root were taken in buccal and lingual surfaces. Fenestrations, root apex position e root coverage were evaluated. Besides, the probing depth, plaque index, recession level and gingival bleeding index were evaluated before and after molar movement. The comparison between groups regarding dehiscence and bone thickness was performed by ANOVA followed by Tukey test. Presence of fenestration and root apex position were investigated by chi-square test. Root coverage measurements were performed by kruskal-wallis and Mann-Whitney. Periodontal parameters investigation were performed by Student t test (intergroup) and ANOVA and Tukey test (intergroup). Results: There were no significant differences for premolars measurements. Other than that, the distance between the CEJ and the alveolar crest was significant higher for molars that were moved to atrophic areas without differences on bone thickness. There was no difference for presence of fenestration between groups. GF showed centralized root apex, while others groups showed a small buccal root displacement. GF showed lower root coverage than GA and GC. Regarding periodontal parameters, there was no differences for intragroup comparison, but bleeding gingival index was higher on GA at end of treatment. Conclusions: It was concluded that molar movement to atrophic areas increased buccal and lingual dehiscences and this movement should be indicated with caution. (AU) | |
| FAPESP's process: | 11/14077-0 - Periodontal effects of second molars moving through atrophic alveolar ridge area |
| Grantee: | Patricia Bittencourt Dutra dos Santos |
| Support Opportunities: | Scholarships in Brazil - Doctorate |