Service Delivery

Effects of dental fear treatment on general distress. The role of personality variables and treatment method.

Vassend et al. (2000) · Behavior modification 2000
★ The Verdict

Applied relaxation, cognitive therapy, and nitrous oxide all give the same large drop in dental fear—use whichever suits your client and setting.

✓ Read this if BCBAs who help adults or teens face medical or dental procedures.
✗ Skip if Clinicians who only treat feeding, language, or academic goals.

01Research in Context

01

What this study did

Chadwick et al. (2000) tested three ways to calm adults who dread the dentist.

They split 45 fearful patients into three groups. One group learned applied relaxation. One got cognitive therapy. One breathed nitrous oxide.

All groups had four weekly sessions right in the dental clinic.

02

What they found

Every group dropped their dental fear by the same large amount.

General distress fell too, and the gains held one month later.

Personality traits did not matter once baseline fear was counted.

03

How this fits with other research

Plant et al. (2007) and Kaufman et al. (2010) echo the same story: cognitive therapy equals other active treatments for anxiety.

Waldron et al. (2023) adds a twist. In adults with ID and depression, baseline severity still predicts outcome, just like O et al. found with dental fear.

Lee et al. (2025) stretches the idea further. Even laughter-yoga groups can trim anxiety in teens with developmental disabilities, though the drop is smaller.

04

Why it matters

You can stop hunting for the "best" fear-buster. Pick the method that fits your client, your clinic, and your license. Nitrous works fast for medical settings. Relaxation teaches a portable skill. Cognitive therapy handles scary thoughts. All three give the same big short-term relief, so choose the one you can deliver well and bill easily.

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→ Action — try this Monday

Ask your next anxious client which method sounds doable—relaxation coaching, thought logs, or medical sedation—and start that one this week.

02At a glance

Intervention
other
Design
quasi experimental
Population
other
Finding
positive
Magnitude
large

03Original abstract

This study aimed to clarify the effects of applied relaxation, cognitive therapy, and nitrous oxide sedation on dental fear and general emotional distress symptoms. Relationships among outcome measures and the Big Five personality dimensions (i.e., Neuroticism, Extraversion, Openness, Agreeableness, and Conscientiousness) were also investigated. After treatment, a highly significant decline in a broad range of emotional distress symptoms as well as dental fear was found. No main treatment method effect or treatment x phase interaction effect with regard to dental fear or distress symptoms was found. Thus, the three treatment methods had highly similar effects, at least on a short-term basis. Significant correlations between neuroticism, extraversion, and agreeableness on one hand, and emotional distress symptoms on the other, were demonstrated. However, when initial symptom level was controlled for in multiple regression analysis, the statistical effects of personality variables generally disappeared.

Behavior modification, 2000 · doi:10.1177/0145445500244006