Supervisors info:
Ηρακλής Γούσιας, Επίκουρος Καθηγητής Προσθετικής, Παπαβασιλείου Γεώργιος, Επίκουρος Καθηγητής Προσθετικής,Ζωίδης Παναγιώτης, Λέκτορας Προσθετικής
Summary:
PURPOSE: Aim of this study was to evaluate the fracture strength of failure of
two
different kinds of single tooth implant abutments after static loading.
MATERIALS AND METHOD: Ten single implant-supported CoCr crowns of central
incisors were cemented, using a dual – cure resin cement, on prefabricated
straight
titanium abutments will be used as control group and compared , with 10 CoCr
crowns of central incisors cemented, using a dual – cure resin cement, on
hybridceramic
abutments (titanium sleeve-lithium disilicate coping), which were used as test
group. The abutments, in both groups, were fixed and screwed, before cementation
on 20 endosseous titanium implants, internally connected, with diameter 4,20mm
and
length of 13mm. All the specimens were loaded via Tensometer 10, (Monsanto,
Akron, Ohio, USA). All the specimens were tested for fracture strength
resistance
using compressive load on the palatal surfaces of the crowns.
RESULTS: The results of the static loading of the specimens were as follow:
Group Ι
(control group): Minimum value: 304,87 Ν, Maximum value: 650,04 N, Μean value:
437,85 Ν, Standard deviation: 99,98 Ν.
Group ΙI (test group): Minimum value: 188,76 Ν, Maximum value: 567,09 N, Mean
value: 362,37 Ν, Standard deviation: 82,91 Ν.
After statistical analysis of the results, the fracture strength of the
titanium abutments
wa found significantly different compared to the hybrid abutments (p0,05).
CONCLUSION: Within the limitations of this study, the load to failure was
significantly higher for the titanium abutments than for the hybrid abutments.
Despite
this significant difference, the value recorded for the hybrid abutments group,
shows
that these abutments are able to withstand the loads produced during normal
function
and can be seen as a viable treatment alternative in anterior implant
restorations.
Keywords:
Metalceramic abutment, Hybrid abutment, Fracture strength, Fracture toughness
