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Importance of Crown Height Ratios in Dental Implants on the Fracture Strength of Different Connection Designs: An In Vitro Study
Author(s) -
Gehrke Sergio Alexandre
Publication year - 2015
Publication title -
clinical implant dentistry and related research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.338
H-Index - 85
eISSN - 1708-8208
pISSN - 1523-0899
DOI - 10.1111/cid.12165
Subject(s) - crown (dentistry) , implant , connection (principal bundle) , dentistry , universal testing machine , dental implant , fracture (geology) , materials science , group (periodic table) , orthodontics , mathematics , geometry , composite material , chemistry , medicine , surgery , ultimate tensile strength , organic chemistry
Purpose The aim of the present in vitro study was to assess the resistance to static fatigue of implants with different connections at various crown heights. Materials and Methods Sixty conical implants and 60 abutments were used with the smallest diameters available for each model. Three groups ( n = 20) were established based on the implant connections: Morse taper Ø3.50 mm (group 1), external hexagon Ø3.50 mm (group 2), and internal hexagon Ø3.50 mm (group 3). Four crown heights were tested: h 1 = 8 mm, h 2 = 10 mm, h 3 = 12 mm, and h 4 = 14 mm. All groups were subjected to quasi‐static loading at a 30° angle to the implant axis in a universal testing machine. Results The mean fracture strengths for group 1 were 1524 N ( h 1 ), 1469 N ( h 2 ), 750 N ( h 3 ), and 729 N ( h 4 ). Those for group 2 were 1504 N ( h 1 ), 814 N ( h 2 ), 491 N ( h 3 ), and 325 N ( h 4 ). Those for group 3 were 1543 N ( h 1 ), 672 N ( h 2 ), 403 N ( h 3 ), and 390 N ( h 4 ). Conclusions Resistance to loading decreases significantly with increasing crown height, and the connection design can affect the performance.