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HOME > Restor Dent Endod > Volume 47(3); 2022 > Article
Research Article Effects of different topical anesthetics on pain from needle insertion and injection, and the influence of anxiety in patients awaiting endodontic treatment
Fatih Aksoy1orcid, Samet Tosun2orcid
Restor Dent Endod 2022;47(3):e25.
DOI: https://doi.org/10.5395/rde.2022.47.e25
Published online: June 7, 2022

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Correspondence to Fatih Aksoy, DDS, PhD. Associate Professor, Department of Endodontics, Faculty of Dentistry, Adıyaman University, No:411, 02200, Adıyaman, Turkey. dr.f.aksoy@gmail.com
• Received: October 6, 2021   • Revised: December 9, 2021   • Accepted: January 10, 2022

Copyright © 2022. The Korean Academy of Conservative Dentistry

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (https://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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  • Objectives
    This study aimed to evaluate the effects of 5% lidocaine and 2.5% lidocaine/2.5% prilocaine topical anesthetic on pain during needle insertion and infiltration injection in the labial mucosa of anterior maxillary teeth, and to assess the relationship between patients’ anxiety and pain scores.
  • Materials and Methods
    The Modified Dental Anxiety Scale questionnaire was applied and recorded. Patients were randomly divided into 4 groups (n = 30), as follows: G1 group: 5% lidocaine and placebo for 1 minute, G2 group: 2.5% lidocaine/2.5% prilocaine and placebo for 1 minute, G3 group: 5% lidocaine and placebo for 3 minutes, and G4 group: 2.5% lidocaine/2.5% prilocaine and placebo for 3 minutes. Before the application of topical anesthesia, one side was randomly selected as the topical anesthesia and the contralateral side as the placebo. The pain levels were measured with Visual Analog Scale (VAS) immediately after needle insertion and injection and were compared. The correlation between anxiety and pain scores was analyzed.
  • Results
    Administration of 5% lidocaine for 1 minute had significantly higher pain scores for both insertion and infiltration injection than the other groups (p < 0.05). There was a significant moderate positive correlation between dental anxiety and the injection-induced VAS pain score in the placebo side in all groups (p < 0.05).
  • Conclusions
    Topical anesthetics significantly reduced the pain caused by both needle insertion and injection pain in comparison to the placebo side. The pain scores of patients with dental anxiety were lower on the topical anesthesia compared to the placebo side.
  • Trial Registration
    Thai Clinical Trials Registry Identifier: TCTR20201217002
  • Keywords: Anesthesia; Anxiety; Pain
Intraoral local anesthesia is one of the most widely used strategies for managing pain during dental treatments, especially endodontic treatments, but is also feared by many patients [1,2,3,4]. In dental practice, injections into the mouth often cause patients serious anxiety [5]. Psychological factors, such as anxiety and fear, play important roles in pain perception. A previous study reported more intense and prolonged pain in highly anxious than normal subjects [6]. Therefore, evaluations should be made in the former group.
Two types of pain are associated with the administration of local anesthesia, namely at needle insertion and during injection of anesthetic solution [4]. Some patients may consider the anesthetic injection to be as worrisome as the dental treatment itself [7]. Therefore, dentists should try to make injections as painless as possible. Topical anesthetic agents have long been used in dentistry to reduce the pain that occurs during infiltration injections [8].
The topical anesthetic agents routinely used worldwide are 5% lidocaine and a mixture of 2.5% lidocaine/2.5% prilocaine [9,10]. These are classified as amide-type anesthetics, and are also used as gel, solution, ointment, and spray formulations [11]. In previous studies, topical anesthesia was applied to the oral mucosa for varying amounts of time [10,12]. However, there is no consensus on the optimum application time for local anesthetics. In addition, the permeability of the oral mucosal epithelium can be affected by the application method and time [13].
Clinical research is still lacking considering the role of the aforementioned factors in topical anesthesia. Here, we evaluated the effects of topical anesthesia at the needle insertion and injection site (in the labial mucosa of anterior maxillary teeth) according to application time, and assessed the effects of dental anxiety on patient pain levels.
This split-mouth placebo-controlled double-blind clinical study was performed to examine the efficacy of different topical anesthetics for the control of pain, and the influence of anxiety, in patients awaiting endodontic treatment (Figure 1 for a flow diagram).
Figure 1

PRIRATE 2010 flowchart.

rde-47-e25-g001.jpg
Sample size
According to the reference study Visual Analog Scale (VAS) results; they had a large effect size (f = 0.604) [14]. Assuming we can achieve a lower effect size level (f = 0.35), a power analysis (G*Power 3.1 software, Heinrich-Heine-Universität Düsseldorf, Dusseldorf, Germany) was performed before the present study. Accordingly, when at least 96 participants (at least 24 participants for each therapy) were included in the study, that would result in 80% power with 95% confidence level (5% type 1 error rate). We included 120 participants in the present study (30 participants for each group). For VAS results, we had a large effect size (f = 0.518) and with this result, we reached 99.8% power with 95% confidence.
Materials
The commercial topical formulations used in this study were 5% lidocaine (Anestol® 5%, Sandoz, Kocaeli, Turkey) and 2.5% lidocaine/2.5% prilocaine mixture (Jetex® 5%, Pharmet, Istanbul, Turkey). As a placebo for each topical anesthetics, a topical gel with the same appearance and color that consists of polyethylene glycol 1500, polyethylene glycol 6000, propylene glycol, methyl paraben, and propyl paraben was prepared by a pharmacologist.
Patient selection
A total of 120 patients volunteered to participate in this split-mouth double-blind clinical trial. All patients provided written informed consent prior to participating in the study. The eligibility criteria were as follows: aged 18–65 years, American Society of Anesthesiologists category I or II, able to read the informed consent form and willing to participate, and no intolerance and/or allergies to the ingredients of the drugs used in the study. Vital teeth were selected that were clinically asymptomatic without spontaneous, prolonged, severe pain, and radiographic pathology and none had received apical surgery. None of the patients had used sedative analgesics or anxiety medications in the 12 hours prior to the study, and pregnant and breastfeeding women were excluded.
Procedure
Initially, the Modified Dental Anxiety Scale (MDAS) of Humphris et al. [15], consisting of 5 questions each rated from 1 to 5, was used to determine the level of dental anxiety of each patient. MDAS scores were recorded.
To determine the efficacy of topical anesthetics relative to each other and the placebo, 5% lidocaine, 2.5% lidocaine/2.5% prilocaine mixture and placebo creams were placed in identical boxes, which were numbered using a random number table by a clinical nurse. The similar appearance of the boxes ensured that the clinician, patients and study authors were all blinded to the treatment. The nurse placed equal amounts of topical anesthetic and placebo treatment on sterile gauze (2 × 2 inches), and then passed the gauze to the clinician. Prior to the administration of agents (topical anesthesia or placebo), one side of the anterior maxillary region was randomly selected as the topical anesthetic side, with the contralateral side serving as the control (placebo) in each group. The sides to which the substances were applied were systematically alternated. In total, 120 patients were randomly divided into 4 groups (n = 30) using the Research Randomizer program (version 4.0, Urbaniak G.C. and Plous S., Lancaster, PA, USA; accessed at www.randomizer.org). It was implemented as follows: G1 group: 5% lidocaine and placebo cream for 1 minute; G2 group: 2.5% lidocaine/2.5% prilocaine mixture and placebo cream for 1 minute; G3 group: 5% lidocaine and placebo cream for 3 minutes; and G4 group: 2.5% lidocaine/2.5% prilocaine mixture and placebo cream for 3 minutes. In each group, one of the topical anesthetic creams was applied to the labial mucosa of the anterior maxillary tooth for 1 or 3 minutes; placebo creams were also applied for 1 or 3 minutes, to the contralateral side of the same patient.
The patients were instructed to score their pain during needle insertion and injection on a 100-mm horizontal non-graded VAS. In all groups, the same clinician inserted a 27-gauge needle (Ayset, Adana, Turkey) into the labial mucosa of the anterior maxillary tooth on the anesthetic side to a depth of 5 mm and then the patient was asked to provide a VAS score [8]. This was followed immediately by an injection of 0.9 mL of the anesthetic solution (1.8 mL articaine 4% with 1: 100,000 epinephrine) over a period of 30 seconds., and then then the patient was asked again to provide a VAS score. The needle was withdrawn and inserted 5 mm into the labial mucosa of the anterior maxillary tooth on the placebo side, and the patient was then asked to give a VAS pain score again. This was immediately followed by an injection of 0.9 mL of anesthetic solution (1.8 mL of articaine 4% to 1:100,000 epinephrine) over a period of 30 seconds, after which the patient was again asked to give a VAS score. VAS scores were recorded. The means of VAS score for insertion or injection was compared within the group between (the topical anesthetic side and the contralateral side [placebo]), and between all groups.
Moreover, MDAS scores < 12 and ≥ 12 were considered to indicate low and high levels of dental anxiety level, respectively [8]. The means of VAS score for the insertion or the injection was compared to patients with lower MDAS scores and those with higher MDAS scores.
Statistical analysis
All statistical analyses were performed using SPSS 25.0 software (IBM Corp., Armonk, NY, USA). Continuous variables were expressed as mean ± standard deviation (SD) and categorical variables as number and percent. Shapiro-Wilk test was used for testing normality. If parametric test conditions were satisfied, independent samples t-test was used for comparisons among groups. If parametric test conditions were not satisfied, Mann-Whitney U test and Kruskal-Wallis variance was used for comparisons among groups. The post hoc Mann-Whitney U test with Bonferroni correction was used when Kruskal-Wallis variance analysis determined a significant difference. For pairwise comparisons; if parametric test conditions were satisfied paired samples t-test; and if parametric test conditions were not satisfied Wilcoxon signed rank test was used. Chi-square test was used to compare the categorical variables. Spearman correlation coefficient was used for determining the correlation between continuous variables. In all analyses, p < 0.05 was taken to indicate statistical significance.
Ethical approval
All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the version 2008 of Helsinki declaration and registered at Thai Clinical Trials Registry (www.clinicaltrials.in.th; Thai Clinical Trial Registry identification number TCTR20201217002). The present study was approved by the Clinical Researches Ethics Committee of Adiyaman University (Adiyaman/Turkey, Approval No: 13-1/2019). Informed consent Informed consent was obtained from all individual participants included in the study.
A total of 120 patients (61 men and 59 women aged 20–63 years) participated in this study. The sex ratio and mean age were comparable between groups (Table 1). Sex and age were not significant factors among the groups (p > 0.05). The mean VAS pain scores are presented in Figure 2 and Table 2. Topical anesthetics significantly reduced both the insertion and injection pain in comparison to placebo. The administration of 5% lidocaine for 1 minute had significantly higher levels of insertion and injection pain on the topical anesthetic side than all other groups (p < 0.05). Assessment of pain scores at the time of needle insertion indicated that the administration of 2.5% lidocaine/2.5% prilocaine for 1 minute had significantly better results than the administration of 5% lidocaine for 1 minute. Furthermore, the administration of 5% lidocaine for 1 minute also showed significantly higher pain scores than the administration of 5% lidocaine for 3 minutes (p < 0.05).
Table 1

Demographic data of the patients; MDAS scores of the all groups

Demographic data G2 (n = 30) G4 (n = 30) G1 (n = 30) G3 (n = 30) Total (n = 120) p value
Age (yr) 38.30 ± 12.77 38.63 ± 10.04 37.57 ± 12.84 37.60 ± 12.86 38.03 ± 12.06 0.959*a
Sex (M/F) 17/13 (56.7/43.3) 14/16 (46.7/53.3) 13/17 (43.3/56.7) 17/13 (56.7/43.3) 61/59 (50.8/49.2) 0.698*b
MDAS score 12.17 ± 2.57 12.23 ± 2.76 12.13 ± 4.20 12.27 ± 3.62 0.970*a
≥ 12 15 14 18 14 59 (49.2) 0.637*b
< 12 15 16 12 16 61 (50.8)
Values are presented as number (%) or mean ± standard deviation.
MDAS, Modified Dental Anxiety Scale.
*p > 0.05.
aKruskal-Wallis variance analysis; bChi-square test.
Figure 2

The needle insertion and injection VAS scores of the groups.

VAS, Visual Analog Scale; SD, standard deviation.
rde-47-e25-g002.jpg
Table 2

Comparison of Visual Analog Scale scores (mm) between placebo and anesthesia after both the needle insertion and injection in all group

Group G2 (1) G4 (2) G1 (3) G3 (4) Intergroup p value
Insertion
Topical anesthesia 14.00 ± 5.02 11.93 ± 8.17 23.80 ± 12.89 14.50 ± 10.71 0.0001*a (2–3, 3–4, 1–3)
Placebo 40.20 ± 4.79 43.20 ± 12.21 43.90 ± 12.47 45.30 ± 17.42 0.752a
In-group p value 0.0001*f 0.0001*e 0.0001*f 0.0001*f
Injection
Topical anesthesia 42.53 ± 13.35 35.23 ± 14.3 55.8 ± 13.44 38.83 ± 9.31 0.0001*a (2–3, 3–4, 1–3)
Placebo 73.77 ± 7.11 74.53 ± 6.71 74.43 ± 12.4 73.97 ± 12.87 0.960a
In-group p value 0.0001*f 0.0001*e 0.0001*e 0.0001*f
Values are expressed as mean ± standard deviation.
*p < 0.05.
aKruskal-Wallis variance analysis; ePaired samples t-test; fWilcoxon signed rank tests.
The MDAS scores of the patients ranged from 5 to 18 in the present study. There was no statistically significant difference in mean MDAS scores among the groups (p > 0.05) (Table 1). Besides, the mean and SD VAS scores of all groups are shown in Table 3 according to dental anxiety level. Patients with higher or lower MDAS scores showed significantly higher insertion and injection pain scores on the placebo side than on the topical anesthetic side (p < 0.05). In the G1 group, patients with high anxiety after, the administration of 5% lidocaine for 1 minute showed significantly higher pain scores during needle insertion than patients with low anxiety (p < 0.05).
Table 3

Comparison of the Visual Analog Scale scores according to Modified Dental Anxiety Scale anxiety levels in all group

Group Anxiety Intergroup p value
< 12 ≥ 12
G2
Insertion
Topical anesthesia 14.07 ± 5.86 13.93 ± 4.23 0.775d
Placebo 39.6 ± 4.79 40.8 ± 4.87 0.539d
In-group p value 0.001*f 0.0001*e
Injection
Topical anesthesia 38.67 ± 14.65 46.40 ± 11.06 0.187d
Placebo 70.07 ± 6.17 77.47 ± 6.10 0.003*d
In-group p value 0.001*f 0.0001*e
G4
Insertion
Topical anesthesia 11.56 ± 5.21 12.36 ± 10.82 0.423d
Placebo 40.25 ± 7.79 46.57 ± 15.48 0.294d
In-group p value 0.0001*e 0.0001*e
Injection
Topical anesthesia 33.75 ± 7.80 36.93 ± 19.50 0.886d
Placebo 71.31 ± 4.19 78.21 ± 7.27 0.003*c
In-group p value 0.0001*e 0.0001*e
G1
Insertion
Topical anesthesia 17.17 ± 11.53 28.22 ± 12.06 0.022*d
Placebo 36.17 ± 8.57 49.06 ± 12.15 0.003*d
In-group p value 0.0001*e 0.0001*e
Injection
Topical anesthetic 50.08 ± 14.11 59.61 ± 11.88 0.072d
Placebo 65.83 ± 12.28 80.17 ± 8.82 0.001*d
In-group p value 0.004*e 0.0001*e
G3
Insertion
Topical anesthesia 11.06 ± 6.21 18.43 ± 13.43 0.334d
Placebo 44.19 ± 16.8 46.57 ± 18.65 0.715c
In-group p value 0.0001*e 0.001*f
Injection
Topical anesthesia 39.38 ± 6.95 38.21 ± 11.71 0.728d
Placebo 67.69 ± 10.74 81.14 ± 11.51 0.001*d
In-group p value 0.0001*e 0.001*f
Values are expressed as mean ± standard deviation.
*p < 0.05.
cIndependent samples t-test; dMann-Whitney U test; ePaired samples t-test; fWilcoxon signed rank tests.
Patients with high anxiety showed significantly higher pain scores during injections on the placebo side in all groups than patients with low anxiety (p < 0.05). Furthermore, we found a significant moderate correlation between dental anxiety and pain scores on the placebo side in all groups (p < 0.05). Age did not have a significant correlation with VAS pain scores in either the topical anesthetic side or the placebo side (p > 0.05).
According to some studies, topical anesthesia is highly effective for reducing pain during dental procedures; however, others have reported contradictory results [1,16,17,18]. In this study, there were significant differences in pain caused by insertion and injection between the topical anesthetic and placebo-treated sides, as shown in Table 2. These findings are consistent with the results of previous studies using 5% lidocaine and a 2.5% lidocaine/2.5% prilocaine mixture [19,20]. Therefore, we suggest the use of topical anesthesia to reduce pain during needle insertion and infiltration injection for maxillary anterior teeth.
A more realistic reaction to pain may express in actual patients than in healthy volunteers [21]. In the present study, the effects of placebo treatment and topical anesthetic were compared in the same patients, to avoid bias associated with interindividual differences. The design also avoided bias associated with temporal differences, where the discrepancy in pain scores between visits can be quite large if there are changes in emotional, psychological, or physical variables [21]. Many previous studies have compared the efficacy of topical anesthetics to placebo, with varying results [1,8,19,22]. The discrepant results may have been due to methodological differences among the studies.
We used a VAS pain score in this study, which is one of the most commonly used methods for assessing pain perception. Previous studies showed that the VAS pain score is a repeatable and highly sensitive method [23,24].
Different parts of the mouth have been used as injection regions in studies [17,18]. In some studies, the labial mucosa of the maxillary anterior region was the preferred injection site [4,8,25]. In the present study, we preferred the labial mucosa of the maxillary anterior region. Another previous study reported that this was one of the most painful areas in the body in which to receive an injection, and that the severity of pain from needle insertion or injection was not associated with different anterior maxillary teeth to be anesthetized [26]. This area, which is suitable for a bilateral application, is therefore a representative sensitive area [27].
Most of the previous studies provided little information on the application time of topical anesthesia [28]. The main reason for an ineffectual anesthetic solution may be a short application time [22]. In the present study, we compared the effects of 1- and 3-minute topical anesthetic application times. One-minute application of 5% lidocaine was not as effective as 2.5% lidocaine/2.5% prilocaine mixture during needle insertion. However, there was no significant difference in efficacy with regard to needle insertion or injection pain between the 2 anesthetics with the 3-minute application time. In this study, the positive effect of 1-minute application of 2.5% lidocaine/2.5% prilocaine mixture with respect to the pain associated with needle insertion may have been due to its composition, i.e., a eutectic mixture of local anesthetics; such mixtures have a lower melting point, so are more easily absorbed through the oral mucous membrane [29].
A previous study reported that 5% lidocaine was as effective as 20% benzocaine if applied for at least 3 minutes [30]. In the present study, 5% lidocaine applied for 3 minutes was as effective as 2.5% lidocaine/2.5% prilocaine mixture applied for 1 minute. Moreover, similar efficacy was observed between 5% lidocaine and 2.5% lidocaine/2.5% prilocaine mixture applied for 3 minutes. In addition, 5% lidocaine applied for 3 minutes reduced pain more effectively than 5% lidocaine applied for 1 minute. In summary, these observations indicated that 5% lidocaine should be applied for at least 3 minutes to ensure a sufficient topical anesthetic effect. Thus, the optimum application time can differ according to both the concentration and type of topical anesthetic used.
Whether patients have anxiety and concerns regarding anesthesia can be determined using specific scales, which are convenient for the physician and aid treatment planning. In the present study, we used the MDAS questionnaire, which is known to be reliable when applied to Turkish populations, and using it alone does not increase the level of anxiety [31,32]. Some studies have shown that female patients have higher dental anxiety levels than male patients, while other studies found no sex difference [31,33,34,35]. In the present study, no relationship was found between sex and dental anxiety; the differences among the reports may have been due to cultural factors.
It is known that there is a relationship between dental anxiety and pain [34]. In addition, there are studies reporting that patients with dental anxiety suffer from significantly impaired oral health–related quality of life [36]. A systematic review reported that patients’ quality of life improved after endodontic treatment [37]. However, dental anxiety can be a serious obstacle to dental treatments. In patients awaiting endodontic treatment, anticipatory anxiety regarding the pain that may occur before or during treatment procedures can be distressing to patients. Despite the availability of a variety of pain management strategies, effective pain control is still difficult [38,39]. However, it may be concluded that successfully managing dental anxiety individuals is achievable for clinicians but requires a phased treatment approach and good communication [38]. For the dentist, the gains in successfully managing both the patient's oral health and dental anxiety can be counted as job satisfaction and minimizing clinical time loss [38]. In the present study, topical anesthesia was associated with significantly lower pain scores in highly anxious patients compared to placebo. We found a significant relationship between MDAS and VAS scores; patients with higher MDAS scores also had higher VAS scores during infiltration injection on the placebo side. These findings indicated that topical anesthesia reduced the effect of dental anxiety on increasing pain, consistent with results reported previously [8].
In conclusion, topical anesthetics facilitate the control of pain caused by both needle insertion and infiltration anesthesia in the anterior maxillary region. The 5% lidocaine was more effective when applied for 3 minutes than for 1 minute, while pain due to insertion and injection did not differ significantly by 2.5% lidocaine/2.5% prilocaine mixture application time. The presence of anxiety during infiltration injection into the anterior maxillary region had a significant effect on pain scores independent of the topical anesthetic application.
The authors are grateful to Hande Şenol for her assistance as statistical analyzer and Miray Ege as a pharmacologist.

Conflict of Interest: No potential conflict of interest relevant to this article was reported.

Author Contributions:

  • Conceptualization: Tosun S.

  • Data curation: Aksoy F.

  • Formal analysis: Aksoy F, Tosun S.

  • Investigation: Tosun S.

  • Methodology: Aksoy F.

  • Project administration: Aksoy F.

  • Supervision: Tosun S.

  • Validation: Tosun S.

  • Visualization: Tosun S.

  • Writing - original draft: Aksoy F, Tosun S.

  • Writing - review & editing: Aksoy F, Tosun S.

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      Effects of different topical anesthetics on pain from needle insertion and injection, and the influence of anxiety in patients awaiting endodontic treatment
      Restor Dent Endod. 2022;47(3):e25  Published online June 7, 2022
      DOI: https://doi.org/10.5395/rde.2022.47.e25
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    Effects of different topical anesthetics on pain from needle insertion and injection, and the influence of anxiety in patients awaiting endodontic treatment
    Image Image
    Figure 1 PRIRATE 2010 flowchart.
    Figure 2 The needle insertion and injection VAS scores of the groups.VAS, Visual Analog Scale; SD, standard deviation.

    Figure 1

    Figure 2

    Effects of different topical anesthetics on pain from needle insertion and injection, and the influence of anxiety in patients awaiting endodontic treatment

    Demographic data of the patients; MDAS scores of the all groups

    Demographic dataG2 (n = 30)G4 (n = 30)G1 (n = 30)G3 (n = 30)Total (n = 120)p value
    Age (yr)38.30 ± 12.7738.63 ± 10.0437.57 ± 12.8437.60 ± 12.8638.03 ± 12.060.959*a
    Sex (M/F)17/13 (56.7/43.3)14/16 (46.7/53.3)13/17 (43.3/56.7)17/13 (56.7/43.3)61/59 (50.8/49.2)0.698*b
    MDAS score12.17 ± 2.5712.23 ± 2.7612.13 ± 4.2012.27 ± 3.620.970*a
    ≥ 121514181459 (49.2)0.637*b
    < 121516121661 (50.8)

    Values are presented as number (%) or mean ± standard deviation.

    MDAS, Modified Dental Anxiety Scale.

    *p > 0.05.

    aKruskal-Wallis variance analysis; bChi-square test.

    Comparison of Visual Analog Scale scores (mm) between placebo and anesthesia after both the needle insertion and injection in all group

    GroupG2 (1)G4 (2)G1 (3)G3 (4)Intergroup p value
    Insertion
    Topical anesthesia14.00 ± 5.0211.93 ± 8.1723.80 ± 12.8914.50 ± 10.710.0001*a (2–3, 3–4, 1–3)
    Placebo40.20 ± 4.7943.20 ± 12.2143.90 ± 12.4745.30 ± 17.420.752a
    In-group p value0.0001*f0.0001*e0.0001*f0.0001*f
    Injection
    Topical anesthesia42.53 ± 13.3535.23 ± 14.355.8 ± 13.4438.83 ± 9.310.0001*a (2–3, 3–4, 1–3)
    Placebo73.77 ± 7.1174.53 ± 6.7174.43 ± 12.473.97 ± 12.870.960a
    In-group p value0.0001*f0.0001*e0.0001*e0.0001*f

    Values are expressed as mean ± standard deviation.

    *p < 0.05.

    aKruskal-Wallis variance analysis; ePaired samples t-test; fWilcoxon signed rank tests.

    Comparison of the Visual Analog Scale scores according to Modified Dental Anxiety Scale anxiety levels in all group

    GroupAnxietyIntergroup p value
    < 12≥ 12
    G2
    Insertion
    Topical anesthesia14.07 ± 5.8613.93 ± 4.230.775d
    Placebo39.6 ± 4.7940.8 ± 4.870.539d
    In-group p value0.001*f0.0001*e
    Injection
    Topical anesthesia38.67 ± 14.6546.40 ± 11.060.187d
    Placebo70.07 ± 6.1777.47 ± 6.100.003*d
    In-group p value0.001*f0.0001*e
    G4
    Insertion
    Topical anesthesia11.56 ± 5.2112.36 ± 10.820.423d
    Placebo40.25 ± 7.7946.57 ± 15.480.294d
    In-group p value0.0001*e0.0001*e
    Injection
    Topical anesthesia33.75 ± 7.8036.93 ± 19.500.886d
    Placebo71.31 ± 4.1978.21 ± 7.270.003*c
    In-group p value0.0001*e0.0001*e
    G1
    Insertion
    Topical anesthesia17.17 ± 11.5328.22 ± 12.060.022*d
    Placebo36.17 ± 8.5749.06 ± 12.150.003*d
    In-group p value0.0001*e0.0001*e
    Injection
    Topical anesthetic50.08 ± 14.1159.61 ± 11.880.072d
    Placebo65.83 ± 12.2880.17 ± 8.820.001*d
    In-group p value0.004*e0.0001*e
    G3
    Insertion
    Topical anesthesia11.06 ± 6.2118.43 ± 13.430.334d
    Placebo44.19 ± 16.846.57 ± 18.650.715c
    In-group p value0.0001*e0.001*f
    Injection
    Topical anesthesia39.38 ± 6.9538.21 ± 11.710.728d
    Placebo67.69 ± 10.7481.14 ± 11.510.001*d
    In-group p value0.0001*e0.001*f

    Values are expressed as mean ± standard deviation.

    *p < 0.05.

    cIndependent samples t-test; dMann-Whitney U test; ePaired samples t-test; fWilcoxon signed rank tests.
    Table 1 Demographic data of the patients; MDAS scores of the all groups

    Values are presented as number (%) or mean ± standard deviation.

    MDAS, Modified Dental Anxiety Scale.

    *p > 0.05.

    aKruskal-Wallis variance analysis; bChi-square test.

    Table 2 Comparison of Visual Analog Scale scores (mm) between placebo and anesthesia after both the needle insertion and injection in all group

    Values are expressed as mean ± standard deviation.

    *p < 0.05.

    aKruskal-Wallis variance analysis; ePaired samples t-test; fWilcoxon signed rank tests.

    Table 3 Comparison of the Visual Analog Scale scores according to Modified Dental Anxiety Scale anxiety levels in all group

    Values are expressed as mean ± standard deviation.

    *p < 0.05.

    cIndependent samples t-test; dMann-Whitney U test; ePaired samples t-test; fWilcoxon signed rank tests.

    Table 1

    Table 2

    Table 3

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