Cooling Profile Following Prosthetic Preparation of 1-Piece Dental Implants
The aim of this study was to evaluate the effect of water irrigation on heat dissipation kinetics following abutment preparation of 1-piece dental implants. UNO 1-piece dental implants were mounted on Plexiglas apparatus clamping the implant at the collar. T-type thermocouple was attached to the first thread of the implant and recorded thermal changes at 100 millisecond intervals. Implants were prepared using highspeed dental turbine at 400 000 RPM with a coarse diamond bur. Once temperature reached 47°C, abutment preparation was discontinued. Thirty implants were divided into 2 groups. Group A: Passive cooling without water irrigation. Group B: Cooling with turbine's water spray adjacent to the implant (30 mL/min). The following parameters were measured: T47 (time from peak temperature to 47°C), T50%, T75% (time until the temperature amplitude decayed by 50% and 75%, respectively), dTemp50%/dt decay, and dTemp75%/dt decay (cooling rate measured at 50% and 75% of amplitude decay, respectively). Water spray irrigation significantly reduced T47 (1.37 ± 0.29 seconds vs 19.97 ± 3.06 seconds, P < 0.0001), T50% (3.04 ± 0.34 seconds vs 27.37 ± 2.56 seconds, P < 0.0001), and T75% (5.71 ± 0.57 seconds vs 57.61 ± 5.47 seconds, P < 0.0001). Water spray irrigation also increased cooling capacity ninefold: dTemp50%/dt decay (4.14 ± 0.61°C/s vs 0.48 ± 0.06°C/s, P < 0.0001), and dTemp50%/dt decay (1.70 ± 0.29°C/s vs 0.19 ± 0.03°C/s, P < 0.0001). The continuous use of water spray adjacent to the abutment following the cessation of implant preparation might prove beneficial for rapid cooling of the implant.Abstract

UNO implant mounted on a Plexiglas apparatus with T type thermocouples attached at first thread.

Figure 2. Typical thermal changes recording. Group A, without water irrigation; group B, with turbine water spray (30 mL/min). Amp indicates thermal amplitude calculated by subtracting baseline temperature from peak temperature; Amp 50% decay and Amp 75% decay, thermal amplitude decay of 50% and 75%, respectively. Figure 3. Comparison of temperatures in both groups. Note that the temperature in group A is significantly higher at all points except baseline. Temp Bl indicates baseline temperature; Temp Max, maximal temperature recorded; Temp50% and Temp75%, temperature recorded at 50% and 75% of thermal amplitude decay, respectively. Data are presented as mean ± SD. *P < .001 between groups. Figure 4. Time intervals measured in both groups. The time interval in group A was significantly higher at all points. T47 indicates time until peak temperature decayed to 47°C; T50% and T75%, time until the temperature amplitude decayed by 50% and 75%, respectively. Data are presented as mean ± SD. *P < .001 between groups.
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