Apreliminary study of intra-pocket topical versusinjected anaesthetic for scaling and root planing
: Jill L. Stoltenberg
: Blackwell Synergy
Aim: Compare the efficacy of topical benzocaine gel to injected lidocaine during
scaling and root planing.
Materials and Methods: In each of 21 participants undergoing root planing, two dental
quadrants were randomly assigned to receive topical 20% benzocaine gel delivered
subgingivally (TOP) or injection anaesthesia using 2% lidocaine (INJ). Baseline,
intra- and immediate post-operative pain was assessed using the HeftÃ¢â‚¬â€œParker pain scale.
Intra-subject differences (INJÃ¢â‚¬â€œTOP) were analysed using paired t-tests and mixed models.
Results: Baseline and post-operative pain did not differ between treatments
(p40.50). The injected anaesthetic, however, was associated with less intra-operative
pain than the topical (INJÃ¢â‚¬â€œTOP5 24.9 mm, p50.005) Six participants required
rescue (injected) anaesthesia during treatment with the topical. Eleven participants
(52%) preferred topical over injected anaesthetic. Among these 11, intra-operative
pain scores did not differ significantly (TOP538.6 mm, INJ528.4 mm, p50.23).
Among those who preferred the injected anaesthetic, intra-operative pain scores
differed significantly (TOP584.7 mm, INJ543.8 mm, p50.03).
Conclusions: Intra-pocket benzocaine gel is less effective than injected lidocaine in
controlling pain during scaling and planing. Anaesthetic preference was related to the
level of pain experienced during treatment with the topical. Larger studies are needed
to confirm these findings.
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