Fracture resistance of molars restored with different types of ceramic partial coverage restorations : an in-vitro study

In this study, the survival rate and fracture strength of ceramic inlays, different types of onlays and unprepared teeth were compared, after exposure to the artificial mouth. <br>Ninety-six caries-free human upper first molars were used for the experiment. The teeth were randomly divided into five groups of 16 samples each and a control group (A) with no preparation. In group B, inlay preparation was made in a 6° MOD taper box form with rounded and soft internal line angle and 3 mm deep. The isthmus was 3 mm wide. A mesial and distal finishing 1 mm above cemento-enamel junction has been made. In group C, teeth were prepared in the same manner as the first group, then the mesio-palatal cusp was reduced 2 mm with 45° on the occlusal plane and margins were left in an overlapping form. In group D, teeth were prepared in the same manner as the first group, then both palatal cusps were reduced 2 mm with 45° on the horizontal plane. In group E, teeth were prepared in the same manner as the first group, then the palatal and disto-buccal cusps were reduced. In group F, teeth were prepared in the same manner as the first group, then all cusps were reduced. 16 ceramic inlays (group B) and 64 onlays were fabricated using Experimental Press Ceramic material (EPC). The ceramic inlays and onlays were luted to the teeth using Variolink® II. All test and control samples, were loaded in an artificial mouth to simulate 5 years of clinical work (1.2 million chewing cycles). All test samples survived the exposure to the artificial mouth. Then all samples were loaded until fracture occurred in the universal testing machine. The median fracture strength values (in N), were as follows: group B 1567, group C 1870, group D 1687, group E 1705, group F 1842 and group A (control) 1960. <br>All test groups demonstrated fracture strength values above the maximum suggested load of 500 N. No statistically significant differences in the fracture strength values between the inlay group, the different type

Author dc:creator

• Att, Wael

Contributors dc:contributor

• Strub, Jörg-Rudolf

• Presskeramik
• Teilkronen
• Inlays
• Überlebensrate
• Kausimulator
• fracture strength
• press ceramic
• partial crowns
• survival rate

Repository record source_url

https://freidok.uni-freiburg.de/data/1042

OAI identifier oai:identifier

oai:freidok.uni-freiburg.de:1042