Importance of Crown Height Ratios in Dental Implants on the Fracture Strength of Different Connection Designs: An In Vitro Study

作者：Gehrke Sergio Alexandre^*

来源：Clinical Implant Dentistry and Related Research, 2015, 17(4): 790-797.

DOI：10.1111/cid.12165

• abutment
• crown height
• dental implant
• fracture mode
• fracture strength
• implant connection

PurposeThe 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 MethodsSixty 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 O3.50mm (group 1), external hexagon O3.50mm (group 2), and internal hexagon O3.50mm (group 3). Four crown heights were tested: h(1)=8mm, h(2)=10mm, h(3)=12mm, and h(4)=14mm. All groups were subjected to quasi-static loading at a 30 degrees angle to the implant axis in a universal testing machine.
ResultsThe mean fracture strengths for group 1 were 1524N (h(1)), 1469N (h(2)), 750N (h(3)), and 729N (h(4)). Those for group 2 were 1504N (h(1)), 814N (h(2)), 491N (h(3)), and 325N (h(4)). Those for group 3 were 1543N (h(1)), 672N (h(2)), 403N (h(3)), and 390N (h(4)).
ConclusionsResistance to loading decreases significantly with increasing crown height, and the connection design can affect the performance.

• 出版日期2015-8