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KMID : 1004520100260030241
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Journal of Dental Rehabilitation and Applied Science
2010 Volume.26 No. 3 p.241 ~ p.251
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Fracture Resistance of Low Invasive Fixed Partial Dentures
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Choi Jong-In
Kim Yu-Lee
Shin Chang-Yong
Dong Jin-Keun
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Abstract
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This study aims at contributing to the restorative dentistry by examining results in the vertical load test of four different
low invasive fixed partial dentures. Based on a hypothesis on the right upper first molar is missing, three units of FPDs
were made for the second premolar and the second molar abutment. that is, twelve metal dies and FPDs were made for
resin bonded FPD and Two Key Bridges and Human Bridge without occlusal rest and Human Bridge with occlusal rest.
By using universal test machine, the numerical maximum value were recorded during the vertical load test of each FPDs
after the bonding process treated by Maxcem which is resin cement. The failure process and its result of prosthesis were
also observed. The maximum load was 7,295 N, 4,729 N, 2,190 N, 3,073 N from groups of resin bonded FPD, Two Key
Bridge, Human Bridge without occlusal rest and Human Bridge with occlusal rest respectively. There was a statistical
significance among the groups of resin bonded FPD, Two Key Bridge and Human Brides. However, there was no
significant difference between Human Bridge without occlusal rest and Human Bridge with occlusal rest. Regarding the failure of prosthesis, the groups of Resin Bonded FPD and Two Key Bridge showed that one of the abutment teeth in the both side of retention part was highly failed earlier than the other one (83.2% and 66.6% respectively). While, Human Bridge without occlusal rest and Human Bridge with occlusal rest showed high percentage of failure in the abutment teeth in the both side of retention part at the same time (91.6% and 58.3% respectively). This study demonstrates that the group of Human Bridges has low resistance to the vertical loads of low invasive FPDs in comparison with the groups of resin bonded FPD and Two Key Bridge. Nevertheless, the maximum occlusal load of the restorative position, resistance to diverse restoration failure, amount of tooth reduction and patients’ cooperation should be considered when they
are applied in the clinic in order to choose an appropriate restoration for each patient.
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KEYWORD
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Low Invasive Fixed Partial Denture, Human Bridge, Resistance to Vertical Load
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