Many dentists use a device called BUZZY to numb pain with cold and vibration before injections. But this new study reveals that for deep nerve blocks in children, it might not work at all. Children often fear local anesthetic injections, which affects their cooperation during dental treatment.

This study investigated whether the BUZZY device, which transfers cold and vibration, could help. Pain signals travel through specific nerve fibers known as A-delta and C fibers to the central nervous system. Vibration travels via A-beta fibers, which can theoretically block those pain signals from reaching the brain.

While BUZZY has shown promise for vaccines, results in dentistry remain contradictory and unclear. Previous reviews noted a lack of consensus on the best technique for increasing acceptance of injections. The researchers included thirty children aged six to twelve who needed deep restorations or pulpotomies.

Participants had to be healthy and show positive behavior, while those with chronic conditions were excluded. In the intervention session, the BUZZY tool was placed on the skin for two minutes before and during the injection. To ensure blinding, the control group received the device turned off and at room temperature.

This flowchart maps the participant journey through a crossover clinical trial, starting with one hundred twenty children assessed for eligibility. After randomizing forty-two participants, the diagram details how subjects were allocated to either the BUZZY or control group, followed by a two-week washout period before switching treatments.

By tracking specific dropouts at each stage, such as those who did not return for the next session, the figure clarifies how the final sample size of thirty children was reached for analysis. When comparing the intervention to the control within each group, there were no significant differences in pain scores.

Similarly, looking at the difference in pulse rates showed no significant decrease in anxiety with the BUZZY tool. Table 1 presents the means and standard deviations for three pain assessment scales: Wong–Baker, FLACC, and DIF_PR, across Groups A and B.

The authors report p values for treatment effect, period effect, and carry out effect to analyze these metrics. For instance, under the Wong–Baker scale, the treatment effect p value is listed as 0.9, while the period effect is 0.04. This data allows researchers to evaluate the statistical significance of the intervention's impact on pain perception and physiological responses within this split-mouth study design.

Table 2 presents a statistical comparison of pain and anxiety metrics across the entire study population, combining data from both experimental sessions. The authors report that when aggregating all participants, there are no statistically significant differences between the Buzzy intervention and the control group for any of the three measures: Wong–Baker, FLACC, or Diff-PR.

This is evidenced by p-values of 0.80, 0.56, and 0.46 respectively, which indicates that while specific session-based results varied, the overall average effect of the treatment was not distinct from the control condition in this combined analysis. The results of this split-mouth trial showed that the BUZZY tool did not decrease children's pain or anxiety.

This finding contradicts other studies that suggested vibration tools could decrease pain through distraction. Heart rate was used as a physiologic scale, where increased rates indicate pain and discomfort. The mean difference in heart rates did not significantly decrease in any session for either group.

The first conclusion states that the BUZZY tool did not significantly decrease dental pain in children aged six to twelve. The second conclusion confirms that the device also failed to decrease dental anxiety in these children. The authors found that combining precooling and vibration did not significantly reduce pain or anxiety during inferior alveolar nerve block injections.

This suggests we need better strategies for managing fear in pediatric dentistry.