Analysis of load transfer and stress distribution by splinted and unsplinted implant-supported fixed cemented restorations

作者：Nissan J^*; Ghelfan O; Gross M; Chaushu G

来源：Journal of Oral Rehabilitation, 2010, 37(9): 658-662.

DOI：10.1111/j.1365-2842.2010.02096.x

• load
• stress distribution
• splinted
• unsplinted

P>Controversy remains over the rehabilitation of implant-supported restorations regarding the need to splint adjacent implant-supported crowns. This study compared the effects of simulated occlusal loading of three implants restored with cemented crowns, splinted versus unsplinted. Three adjacent screw-shaped implants were passively inserted into three holes drilled in a photo-elastic model. Two combinations of cemented restorations were fabricated; three adjacent unsplinted and three adjacent splinted crowns. Strain gauges were connected to the implant necks and to the margins of the overlaying crowns. Fifteen axial static loads of 20-kg loadings were carried out right after each other via a custom-built loading apparatus. Strain gauges located on the implant neck supporting splinted restoration demonstrated significantly (P < 0 center dot 001) more strain (sum of strains = 3348 center dot 54 microstrain) compared with the single crowns (sum of strains = 988 center dot 57 microstrain). In contrast, significantly (P < 0 center dot 001) more strain was recorded on the strain gauges located on the restoration margins of the single crowns (sum of strains = 756 center dot 32 microstrain) when compared with splinted restorations (sum of strains = 186 center dot 12 microstrain). The concept of splinting adjacent implants to decrease loading of the supporting structures may require re-evaluation. The clinical relevance of these findings needs further investigation.

• 出版日期2010-9