Factors influencing bonding fixed restorations
INTRODUCTION Crown displacement often occurs because the features of tooth preparations do not counteract the forces directed against restorations. OBJECTIVE The purpose of this study was to evaluate the effect of preparation designs on retention and resistance of fixed restorations. METHOD The stud...
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| Format: | Article |
| Language: | English |
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Serbian Medical Society
2008-01-01
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| Series: | Srpski Arhiv za Celokupno Lekarstvo |
| Subjects: | |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/0370-8179/2008/0370-81790806232M.pdf |
| _version_ | 1819240661330690048 |
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| author | Medić Vesna Obradović-Đuričić Kosovka |
| author_facet | Medić Vesna Obradović-Đuričić Kosovka |
| author_sort | Medić Vesna |
| collection | DOAJ |
| description | INTRODUCTION Crown displacement often occurs because the features of tooth preparations do not counteract the forces directed against restorations. OBJECTIVE The purpose of this study was to evaluate the effect of preparation designs on retention and resistance of fixed restorations. METHOD The study was performed on 64 differently sized stainless steel dies. Also, caps which were used for evaluated retention were made of stainless steel for each die. After cementing the caps on experimental dies, measuring of necessary tensile forces to separate cemented caps from dies was done. Caps, which were made of a silver-palladium alloy with a slope of 60° to the longitudinal axis formed on the occlusal surface, were used for evaluating resistance. A sudden drop in load pressure recorded by the test machine indicated failure for that cap. RESULTS A significant difference was found between the tensile force required to remove the caps from the dies with different length (p<0.05) and different taper (p<0.01). The greatest retentive strengths (2579.2 N and 2989.8 N) were noticed in experimental dies with the greatest length and smallest taper. No statistically significant (p>0.05) differences were found between tensile loads for caps cemented on dies with different diameter. Although there was an apparent slight increase in resistance values for caps on dies with smaller tapers, the increase in resistance for those preparation designs was not statistically significant. There was a significant difference among the resistance values for caps on dies with different length (p<0.01) and diameter (p<0.05). CONCLUSION In the light of the results obtained, it could be reasonably concluded that retention and resistance of the restoration is in inverse proportion to convergence angle of the prepared teeth. But, at a constant convergence angle, retention and resistance increase with rising length and diameter. |
| first_indexed | 2024-12-23T14:11:34Z |
| format | Article |
| id | doaj.art-03d0a605d7544045a2287a2fbc94d92b |
| institution | Directory Open Access Journal |
| issn | 0370-8179 |
| language | English |
| last_indexed | 2024-12-23T14:11:34Z |
| publishDate | 2008-01-01 |
| publisher | Serbian Medical Society |
| record_format | Article |
| series | Srpski Arhiv za Celokupno Lekarstvo |
| spelling | doaj.art-03d0a605d7544045a2287a2fbc94d92b2022-12-21T17:44:01ZengSerbian Medical SocietySrpski Arhiv za Celokupno Lekarstvo0370-81792008-01-011365-623224010.2298/SARH0806232MFactors influencing bonding fixed restorationsMedić VesnaObradović-Đuričić KosovkaINTRODUCTION Crown displacement often occurs because the features of tooth preparations do not counteract the forces directed against restorations. OBJECTIVE The purpose of this study was to evaluate the effect of preparation designs on retention and resistance of fixed restorations. METHOD The study was performed on 64 differently sized stainless steel dies. Also, caps which were used for evaluated retention were made of stainless steel for each die. After cementing the caps on experimental dies, measuring of necessary tensile forces to separate cemented caps from dies was done. Caps, which were made of a silver-palladium alloy with a slope of 60° to the longitudinal axis formed on the occlusal surface, were used for evaluating resistance. A sudden drop in load pressure recorded by the test machine indicated failure for that cap. RESULTS A significant difference was found between the tensile force required to remove the caps from the dies with different length (p<0.05) and different taper (p<0.01). The greatest retentive strengths (2579.2 N and 2989.8 N) were noticed in experimental dies with the greatest length and smallest taper. No statistically significant (p>0.05) differences were found between tensile loads for caps cemented on dies with different diameter. Although there was an apparent slight increase in resistance values for caps on dies with smaller tapers, the increase in resistance for those preparation designs was not statistically significant. There was a significant difference among the resistance values for caps on dies with different length (p<0.01) and diameter (p<0.05). CONCLUSION In the light of the results obtained, it could be reasonably concluded that retention and resistance of the restoration is in inverse proportion to convergence angle of the prepared teeth. But, at a constant convergence angle, retention and resistance increase with rising length and diameter.http://www.doiserbia.nb.rs/img/doi/0370-8179/2008/0370-81790806232M.pdfretentionresistancelengthdiameterconvergence angle |
| spellingShingle | Medić Vesna Obradović-Đuričić Kosovka Factors influencing bonding fixed restorations Srpski Arhiv za Celokupno Lekarstvo retention resistance length diameter convergence angle |
| title | Factors influencing bonding fixed restorations |
| title_full | Factors influencing bonding fixed restorations |
| title_fullStr | Factors influencing bonding fixed restorations |
| title_full_unstemmed | Factors influencing bonding fixed restorations |
| title_short | Factors influencing bonding fixed restorations |
| title_sort | factors influencing bonding fixed restorations |
| topic | retention resistance length diameter convergence angle |
| url | http://www.doiserbia.nb.rs/img/doi/0370-8179/2008/0370-81790806232M.pdf |
| work_keys_str_mv | AT medicvesna factorsinfluencingbondingfixedrestorations AT obradovicđuricickosovka factorsinfluencingbondingfixedrestorations |