The goal of this clinical trial is to learn whether using a new Post-Dental Extraction Care Kit (PDEC-kit) can help patients better understand and follow their post-extraction instructions, and whether it can also reduce dental anxiety, compared with verbal instructions alone. The study is being conducted among adult patients (18 years and older) undergoing routine tooth extractions under local anaesthesia at a university oral surgery clinic.

The main questions this study aims to answer are:

Does the PDEC-kit improve patients' knowledge retention about post-extraction care?

Does the PDEC-kit improve patient compliance with important post-extraction behaviours (e.g., medication use, diet, activity restrictions)?

Does the PDEC-kit reduce patient anxiety compared with standard verbal instructions?

Researchers will compare two groups of patients:

One group will receive the usual standardised verbal instructions.

The other group will receive the same verbal instructions plus the PDEC-kit.

Participants in the PDEC-kit group will:

Watch a short educational video on post-extraction care.

Review illustrated flashcards showing key "dos and don'ts."

Observe a live demonstration using a dental model to learn how to place and bite on gauze correctly.

Take home a bilingual brochure (English and Bahasa Melayu), also available via QR code.

All participants will be asked to answer short questionnaires about their knowledge, behaviour, and dental anxiety at three time points: before the extraction, immediately after receiving instructions, and one week later.

Scientific Rationale

Tooth extraction is one of the most frequently performed dental procedures. Despite its routine nature, poor comprehension of post-operative instructions may lead to complications such as alveolar osteitis, infection, or delayed wound healing. Evidence from health communication research shows that patients retain only a small proportion of verbal-only instructions, particularly in settings of heightened anxiety. Multimedia learning theory (Mayer, 2021) suggests that simultaneous delivery of verbal, visual, and kinesthetic information enhances encoding and recall.

Building on this theory, the Post-Dental Extraction Care Kit (PDEC-kit) was developed. It integrates audiovisual, pictorial, and demonstration-based teaching into a structured package that supplements standard verbal guidance. The central hypothesis is that the PDEC-kit improves knowledge retention, compliance, and anxiety outcomes compared to verbal instructions alone.

Study Design Overview

This is a prospective, single-centre, two-arm, parallel-group randomized controlled trial. Participants are assigned to intervention or control groups in a 1:1 ratio. Allocation concealment was ensured using block randomisation with opaque, sequentially numbered envelopes. Operators performing extractions were blinded to allocation.

The sample size was determined by a priori power analysis using G*Power 3.1, based on a medium effect size (f = 0.25), α = 0.05, power = 0.80, and repeated measures across two groups. The minimum required sample was 86; recruitment was increased to 208 to account for attrition.

Intervention Details

Control arm: Standardised verbal post-extraction instructions delivered by a single calibrated investigator to minimise variability.

Intervention arm: Same standardised verbal instructions plus the PDEC-kit, which consists of:

Educational video (2 minutes): Demonstrates correct gauze placement, oral hygiene, and activity restrictions.

Illustrated flashcards: Show simplified dos and don'ts using pictorial reinforcement.

Live model demonstration: Gauze placement demonstrated on a dental model for kinesthetic learning.

Bilingual brochure (English and Bahasa Melayu): Provides at-home reference; a QR code enables access to a digital version.

All components were pilot-tested for clarity and developed by a multidisciplinary panel of oral surgeons, dental educators, and communication specialists.

Assessment Schedule

Data collection was performed at three points:

T0: Baseline (pre-extraction) - demographic data, knowledge baseline, and anxiety baseline.

T1: Immediately after instruction - post-intervention knowledge and anxiety assessments.

T2: One-week follow-up via telephone - reassessment of knowledge retention, anxiety, compliance, and complications.

Measurement Instruments

Knowledge retention: Four-item structured quiz (binary scoring).

Dental anxiety: Index of Dental Anxiety and Fear (IDAF-4C+, validated Malay version).

Compliance: Structured checklist covering analgesic use, diet, hygiene, activity, and smoking behaviour.

Pain: 10-point Likert scale.

Complications: Self-reported bleeding, infection, or alveolar osteitis, confirmed by clinic review where indicated.

Analytic Framework

Data were analysed using SPSS v29. Statistical procedures included:

Descriptive statistics for demographic and baseline variables.

Independent-samples t-test for between-group comparisons.

Paired-samples t-test for within-group pre-post changes.

Repeated measures ANOVA (Greenhouse-Geisser correction applied when sphericity violated).

Chi-square test for categorical variables (compliance, complication rates).

Spearman's correlation for anxiety-pain association. Significance threshold: p < 0.05.

Inclusion Criteria

• Adults aged 18 years or older

• Scheduled for routine, non-surgical extraction of one or two adjacent permanent teeth

• Able to read and understand either English or Bahasa Melayu

  -=Classified as American Society of Anesthesiologists (ASA) physical status I or II

• Provide written informed consent

Exclusion Criteria

• Previous participation in this study
• ASA physical status III or higher
• History of diagnosed anxiety disorders, depression, or learning disabilities
• Requirement for surgical, complex, or multiple extractions
• Procedures expected to be difficult or requiring assistance from a supervising specialist
• Inability to understand or follow study instructions

De-identified individual participant data (IPD) that underlie the results reported in published articles will be made available to other researchers.

De-identified individual participant data underlying the primary and secondary outcomes reported in the main publication.

How to access data: Requests should be submitted to the corresponding author (Tan Su Keng, Centre of Studies for Oral & Maxillofacial Surgery, Universiti Teknologi MARA). Approved requests will require a signed data use agreement, and data will be shared via secure e

Beginning 6 months after publication of the primary study results and for up to 5 years thereafter.

Data will be available to researchers with a methodologically sound proposal, subject to approval by the principal investigator and UiTM Research Ethics Committee.

Care providers performing the dental extractions were blinded to group allocation. Randomization occurred only after the extraction was completed, and the operating clinician was not involved in delivering post-operative instructions. Participants and the investigator providing instructions were not masked due to the nature of the intervention.