Pain perception during injection of local anesthesia in pedodontics.

OBJECTIVE: Few studies have examined pain levels for the injection of local anesthesia in children, though it is a routine technique in pediatric dentistry. The objective of the study was to evaluate the difference in the assessment of procedural pain by the child, parent, dental practitioner, and independent observers during injection of local anesthesia for dental treatment in pediatric dentistry. METHOD AND MATERIALS: In total, 27 male and 22 female children (5 to 17 years of age, mean ± SD 9.8 ± 4.0 years) received local anesthesia (LA) via infiltration or mandibular alveolar blocks according to a standard protocol. After the dental treatment, the children assessed the pain levels for the procedures on a visual analog scale (VAS), while their parents and the dental practitioner used a numeric rating scale (0 to 10). Independent observers also assessed pain via video tape for an evaluation after blinding. The heart rate was monitored continuously during the procedure. The Bland-Altman method was used to quantify the comparison between pain ratings. RESULTS: The assessed level of pain by dental practitioner, parent, and child during injection of LA differed clearly (child: 3.94 ± 2.71; parent: 3.31 ± 2.60; dental practitioner: 3.02 ± 1.98; video observer 1: 1.76 ± 2.56; video observer 2: 1.89 ± 2.55). In 42.9% of cases the dental practitioner's rating and the self--reported pain by the child during injection of LA differed by ≥ 2 on the numeric rating scale, which is clinically a highly different and relevant assessment. CONCLUSION: As pain perception in children during the injection of local anesthetic and its assessment varies considerably depending on the assessing person and the treated child, dental practitioners and researchers should be cautious in interpreting the patient's pain perception.

Acupuncture Reduces Pain and Autonomic Distress During Injection of Local Anesthetic in Children: A Pragmatic Crossover Investigation.

OBJECTIVES: Stimulation of acupoint LI4 has been shown to result in analgesic effects in patients experiencing acute pain. We aimed to study the effectiveness of LI4 stimulation for pain relief in children receiving an injection of a local anesthetic (LA). MATERIALS AND METHODS: Children scheduled for dental treatment using LA received bilateral acupuncture at LI4 using indwelling fixed needles. During the treatment, the parents of the patients stimulated the needles by massage. Two different treatment regimes were compared: a standardized LA injection given 5 minutes after acupuncture, and an LA injection without acupuncture. The order of treatment was randomized, with the 2 treatments performed in a crossover manner on different days. Pain intensity during LA injection, assessed by the patient with the Verbal Rating Scale or Faces Pain Scale (0 to 10), was used as the primary endpoint. Parent-assessed and dentist-assessed pain intensity and agitation, heart rate, and the patients' satisfaction with the therapy were also recorded. RESULTS: Data were obtained from 49 patients (22 female; mean age 10 y). Patients reported less pain when acupuncture was used: mean 2.3 (95% confidence interval, 1.5-3.1) versus 3.9 (95% confidence interval, 3.0-4.7); P<0.001. The patients' heart rate remained low throughout the dental treatment after LI4 stimulation, when compared with treatment without acupuncture (P<0.05). LI4 stimulation was safe and increased satisfaction levels in both the patients and their parents, when compared with LA injection alone (P<0.05). DISCUSSION: Stimulation of acupoint LI4 reduces pain and autonomic distress in children during LA injection in dental procedures.