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Mechanical fatigue behaviour of different lengths screw‐retained restorations connected to two designs prosthetic connection level
Author(s) -
Pérez León Patricia,
Bartolomé José F.,
Lombardía Carlos,
Pradíes Guillermo
Publication year - 2019
Publication title -
journal of oral rehabilitation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.991
H-Index - 93
eISSN - 1365-2842
pISSN - 0305-182X
DOI - 10.1111/joor.12809
Subject(s) - crown (dentistry) , materials science , connection (principal bundle) , implant , scanning electron microscope , hexagonal crystal system , dentistry , titanium , dental implant , dental prosthesis , cyclic stress , composite material , orthodontics , mathematics , geometry , medicine , chemistry , surgery , metallurgy , crystallography
The aim of this work is to compare the mechanical fatigue behaviour of different crown heights of single crown implant restorations made over two different internal hexagonal titanium dental implant connection levels. Two different groups of internal hexagonal connection were studied: (a) TL group (N = 26) included implants with a transmucosal connection (12.2 mm height and 4.8 mm width) and (b) BL group (N = 26) composed by implants at a bone level connection (10 mm height and 3.8 mm width). Two subgroups (N = 13) were established for each connection level according to crown heights (TL10 = 10 mm, TL15 = 15 mm, BL12 = 12 mm, BL17 = 17 mm). Dynamic load tests were carried out according to ISO Norm 14801. Failed samples and fracture surfaces were analysed with an optical and scanning electron microscope (SEM). The fatigue limit and the fatigue strength degradation (fatigue strength exponent) decreases with increasing crown height (5 mm) in both groups of internal hexagonal titanium dental implant connection levels. Consequently, the mechanical integrity of internal hexagonal dental implants varies with the height of the crown. An increase of 5 millimetres in the crown height appears to significantly decrease the fatigue life of both types of dental implants.