IADR Abstract Archives

Temperature rise during photo-polymerization under ceramic restorations

Objective: The purpose of this study was to measure temperature increase induced by various light-curing units during photo-polymerization beneath ceramic restorations.

Method: Three light-curing units were used; a high intensity quartz-tungsten-halogen unit Elipar 2500 (3M ESPE) and two LED units: Translux Power Blue (Hereaus) and Excelled 1400 (Jovident). The 15 ceramic specimens (CEREC Blocks, Sirona) used in this study were of 2.5 mm thickness, 5 mm wide and 6 mm long and made using a slow speed saw (Isomet, Buehler). Using the same slow speed saw the occlusal enamel portion of 15 mandibular third molars was removed and 15 dentin discs of 1 mm height were prepared. The thickness of the luting cement (Rely X Unicem, 3M ESPE) was delimited to 0.5 mm, using a Teflon mold and then brought into contact with the dentin disc. Light-curing time for all the groups was 20 sec. The temperature rise was measured placing underneath the dentin disc a K-type thermocouple wire connected to a data logger. Five measurements were carried out for each group. The difference between the initial and highest temperature readings was recorded and the 5 calculated temperature changes were averaged to determine the mean value in temperature rise. Statistical analysis was performed using ANOVA at a level of significance of a=0.05

Result: The results indicated that there was a lower temperature rise induced from Translux Power Blue than from the other two light-curing units, which did not present statistically significant difference (p<0.05). However, temperature rise from the light-curing units used in this study is lower than 5.5oC, which is the limit of pulpal damage.

Conclusion: Within the limitations of this study, although the type and characteristics of light-curing units may affect temperature rise under ceramic restorations, this influence is possibly not of clinical significance.

Continental European Division Meeting
2013 Continental European Division Meeting (Florence, Italy)
Florence, Italy
2013
527
Scientific Groups
  • Dionysopoulos, Dimitrios  ( Aristotle University of Thessaloniki, Thessaloniki, N/A, Greece )
  • Papadopoulos, Konstantinos  ( Aristotle University of Thessaloniki, Thessaloniki, N/A, Greece )
  • Kouros, Pantelis  ( Aristotle University of Thessaloniki, Thessaloniki, N/A, Greece )
  • Tsitrou, Effrosyni  ( Aristotle University of Thessaloniki, Thessaloniki, N/A, Greece )
  • Koliniotou-koumpia, Eugenia  ( Aristotle University of Thessaloniki, Thessaloniki, N/A, Greece )
  • Poster Session
    Dental Materials - Resin I
    09/07/2013