J Korean Dent Sci.  2018 Jun;11(1):14-20. 10.5856/JKDS.2018.11.1.14.

Impact on Retrievability by Cement Variety for Implant Restorations Equipped with a Lingual Slot

  • 1Department of Dentistry, Graduate School, Kyungpook National University, Daegu, Korea. kblee@knu.ac.kr
  • 2Department of Prosthodontics, School of Dentistry, Kyungpook National University, Daegu, Korea.
  • 3Advanced Dental Device Development Institute (A3DI), Kyungpook National University, Daegu, Korea.


The purpose of this study is to measure and compare the removal torques of different cements applied in attachments of zirconia restorations on titanium (Ti) abutments fitted with retrievable cement-type slot (RCS) on the lingual side for the better retrievablity by use of a slot driver.
Three types of cements were used in the experiment: two permanent cements in RelyX™ U200 (RU) (3M ESPE) which is a resin cement and FujiCem™ (FC) (GC) which is a resin-modified glass ionomer cement, and a temporary cement in Freegenol™ temporary cement (TC) (GC). Measurements of removal torques were conducted as follows; an attached sample was fixed on the equipment customized for the experiment; a slot driver was connected to a MGT12 (Mark-10 Corp.), a torque measurement instrument; the sample had the driver fitted to its RCS and then was rotated until the it was removed; and finally, the maximum torque value was recorded. RESULT: As for the removal torque measurement results, the average values were 47.9±2.6 Ncm for RU, 43.4±1.5 Ncm for FC, and 20.9±1.0 Ncm for TC. The statistical analysis using Kruskal-Wallis test yielded the significance probability of P < 0.05 (P=0.002), which confirmed the presence of significant differences between the three groups.
All three cements exhibit clinically acceptable levels of removal torque when applied to an upper zirconia implant restoration fitted with a lingual slot, with RU and FC, the two permanent cements, having the significantly higher values than that of TC, the temporary cement.


Dental implant; Device removal; Resin cements; Torque
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