In vitro evaluation of flexural strength of different brands of expansion screws
OBJECTIVE: The objective of this study was to compare the flexural strength of the stems of three maxillary expanders screws of Morelli, Forestadent and Dentaurum brands. METHODS: The sample consisted of nine expander screws (totalizing of 36 stems), three from each brand, all stainless steel and 12...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Dental Press Editora
2012-06-01
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| Series: | Dental Press Journal of Orthodontics |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2176-94512012000300020 |
| _version_ | 1811247378439602176 |
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| author | Kádna Fernanda Mendes de Oliveira Mário Vedovello Filho Mayury Kuramae Adriana Simoni Lucato Heloisa Cristina Valdhigi |
| author_facet | Kádna Fernanda Mendes de Oliveira Mário Vedovello Filho Mayury Kuramae Adriana Simoni Lucato Heloisa Cristina Valdhigi |
| author_sort | Kádna Fernanda Mendes de Oliveira |
| collection | DOAJ |
| description | OBJECTIVE: The objective of this study was to compare the flexural strength of the stems of three maxillary expanders screws of Morelli, Forestadent and Dentaurum brands. METHODS: The sample consisted of nine expander screws (totalizing of 36 stems), three from each brand, all stainless steel and 12 mm of expansion capacity. The stems of the expander screws were cut with cutting pliers close to the weld region with screw body, then fixed in a universal testing machine Instron 4411 for tests of bending resistance of three points. The ultimate strength in kgF exerted by the machine to bend the stem of the 5 mm screw was recorded and the flexural strength was calculated using a mathematical formula. During the flexural strength test it was verified the modulus of elasticity of the stems by means of Bluehill 2 software. The flexural strength data were subjected to ANOVA with one criterion and Tukey's test, with significance level of 5%. RESULTS: Forestadent screw brand showed the greatest bending strength, significantly higher than Dentaurum. Morelli showed the lowest resistance. CONCLUSION: The flexural strength of the screws varied according to the brand. Forestadent screw showed the greatest resistance and Morelli the lowest. All the three screws were found adequate for use in procedures for rapid maxillary expansion. |
| first_indexed | 2024-04-12T15:07:47Z |
| format | Article |
| id | doaj.art-759a2d5315194e7bb87203144ff30257 |
| institution | Directory Open Access Journal |
| issn | 2176-9451 2177-6709 |
| language | English |
| last_indexed | 2024-04-12T15:07:47Z |
| publishDate | 2012-06-01 |
| publisher | Dental Press Editora |
| record_format | Article |
| series | Dental Press Journal of Orthodontics |
| spelling | doaj.art-759a2d5315194e7bb87203144ff302572022-12-22T03:27:52ZengDental Press EditoraDental Press Journal of Orthodontics2176-94512177-67092012-06-0117310310710.1590/S2176-94512012000300020In vitro evaluation of flexural strength of different brands of expansion screwsKádna Fernanda Mendes de OliveiraMário Vedovello FilhoMayury KuramaeAdriana Simoni LucatoHeloisa Cristina ValdhigiOBJECTIVE: The objective of this study was to compare the flexural strength of the stems of three maxillary expanders screws of Morelli, Forestadent and Dentaurum brands. METHODS: The sample consisted of nine expander screws (totalizing of 36 stems), three from each brand, all stainless steel and 12 mm of expansion capacity. The stems of the expander screws were cut with cutting pliers close to the weld region with screw body, then fixed in a universal testing machine Instron 4411 for tests of bending resistance of three points. The ultimate strength in kgF exerted by the machine to bend the stem of the 5 mm screw was recorded and the flexural strength was calculated using a mathematical formula. During the flexural strength test it was verified the modulus of elasticity of the stems by means of Bluehill 2 software. The flexural strength data were subjected to ANOVA with one criterion and Tukey's test, with significance level of 5%. RESULTS: Forestadent screw brand showed the greatest bending strength, significantly higher than Dentaurum. Morelli showed the lowest resistance. CONCLUSION: The flexural strength of the screws varied according to the brand. Forestadent screw showed the greatest resistance and Morelli the lowest. All the three screws were found adequate for use in procedures for rapid maxillary expansion.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2176-94512012000300020Palatal expansion techniqueCorrective orthodonticsMalocclusion |
| spellingShingle | Kádna Fernanda Mendes de Oliveira Mário Vedovello Filho Mayury Kuramae Adriana Simoni Lucato Heloisa Cristina Valdhigi In vitro evaluation of flexural strength of different brands of expansion screws Dental Press Journal of Orthodontics Palatal expansion technique Corrective orthodontics Malocclusion |
| title | In vitro evaluation of flexural strength of different brands of expansion screws |
| title_full | In vitro evaluation of flexural strength of different brands of expansion screws |
| title_fullStr | In vitro evaluation of flexural strength of different brands of expansion screws |
| title_full_unstemmed | In vitro evaluation of flexural strength of different brands of expansion screws |
| title_short | In vitro evaluation of flexural strength of different brands of expansion screws |
| title_sort | in vitro evaluation of flexural strength of different brands of expansion screws |
| topic | Palatal expansion technique Corrective orthodontics Malocclusion |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2176-94512012000300020 |
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