Journal of implantology and applied sciences ISSN:2765-7833(Print) 2765-7841(Online) 대한구강악안면임플란트학회지

When implant abutment length is short, cement retained prosthesis is not designed because of low retention. There are many way to increase retentive force. They are changing tapered angle, surface treatment and change of cement but there is no clinical guideline. The purpose of this study was to evaluate the effect of length, surface characteristics of the abutment and cement type on the retention of implant prosthesis. 45 abutments (AVANA cemented abutment) were divided as follows: abutment length surface treatment 3㎜ (n=15) smooth surface, sandblasting, diamond bur preparation 5㎜ (n=15) smooth surface, sandblasting, diamond bur preparation 7㎜ (n=15) smooth surface, sandblasting, diamond bur preparation Temp-bond^®(Zinc oxide-eugenol cement), Flek’s^® (Zinc phosphate cement) and Panavia 21^®(resin cement) were used as a luting agent. Implant prosthesis were made as routine processes. Tensile strength was measured by universal testing machine. Tensile strength values were statistically analyzed. The results were as follows. 1. When abutment length or surface roughness or cement retention was increased, we can get higher retentive values of the implant prosthesis. 2. In the case of 7㎜ abutments, retentives value of surface treated groups was statistically higher than that of smooth surface group (P<0.05). 3. In the case of 5㎜ abutments, retentive value of surface treated groups were statistically higher than that of smooth surface group when they were luted with Panavia 21^®(P<0.05). Retentive values of 5㎜ smooth surface with Fleck’s^® or Panavia 21^® groups was statistically higher than that of 5㎜ smooth surface with Temp-bond^® group (P<0.05). 4. In the case of 3㎜ abutments, retentive values of surface treated groups were not statistically higher than that of smooth surface group when they were luted with same cement. Retentive values of 3㎜ smooth surface with Fleck’s^® or Panavia 21^® groups was statistically higher than that of 3㎜ smooth surface with Temp-bond^® group (P<0.05). In conclusion, this result showed that surface treatment of implant abutment and changing the cement type are good methods to increase the retention of prosthesis when the length of abutment is short.