Premium
Load‐bearing capacity of all‐ceramic posterior inlay‐retained fixed dental prostheses
Author(s) -
Puschmann Djamila,
Wolfart Stefan,
Ludwig Klaus,
Kern Matthias
Publication year - 2009
Publication title -
european journal of oral sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.802
H-Index - 93
eISSN - 1600-0722
pISSN - 0909-8836
DOI - 10.1111/j.1600-0722.2009.00626.x
Subject(s) - inlay , materials science , load bearing , composite material , ceramic , composite number , bearing (navigation) , cubic zirconia , cable gland , weight bearing , dental prosthesis , bearing capacity , structural engineering , engineering , computer science , surgery , medicine , mechanical engineering , artificial intelligence , implant
The purpose of this in vitro study was to compare the quasi‐static load‐bearing capacity of all‐ceramic resin‐bonded three‐unit inlay‐retained fixed dental prostheses (IRFDPs) made from computer‐aided design/computer‐aided manufacturing (CAD/CAM)‐manufactured yttria‐stabilized tetragonal zirconia polycrystals (Y‐TZP) frameworks with two different connector dimensions, with and without fatigue loading. Twelve IRFDPs each were made with connector dimensions 3 × 3 mm 2 (width × height) (control group) and 3 × 2 mm 2 (test group). Inlay‐retained fixed dental prostheses were adhesively cemented on identical metal‐models using composite resin cement. Subgroups of six specimens each were fatigued with maximal 1,200,000 loading cycles in a chewing simulator with a weight load of 25 kg and a load frequency of 1.5 Hz. The load‐bearing capacity was tested in a universal testing machine for IRFDPs without fatigue loading and for IRFDPs that had not already fractured during fatigue loading. During fatigue testing one IRFDP (17%) of the test group failed. Under both loading conditions, IRFDPs of the control group exhibited statistically significantly higher load‐bearing capacities than the test group. Fatigue loading reduced the load‐bearing capacity in both groups. Considering the maximum chewing forces in the molar region, it seems possible to use zirconia ceramic as a core material for IRFDPs with a minimum connector dimension of 9 mm 2 . A further reduction of the connector dimensions to 6 mm 2 results in a significant reduction of the load‐bearing capacity.