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Desensitizing Agent Reduces Dentin Hypersensitivity During Ultrasonic Scaling: a Pilot Study Dentistry Section Original Article DOI: 10.7860/JCDR/2015/13775.6495 Desensitizing Agent Reduces Dentin Hypersensitivity During Ultrasonic Scaling: A Pilot Study Dentistry Section TOMONARI SUDA1, HIROAKI KOBAYASHI2, TOSHIHARU AKIYAMA3, TAKUYA TAKANO4, MISA GOKYU5, TAKEAKI SUDO6, THATAWEE KHEMWONG7, YUICHI IZUMI8 ABSTRACT of the dentin hypersensitivity agent. Evaluation of effects on Background: Dentin hypersensitivity can interfere with optimal dentin hypersensitivity was determined by a questionnaire and periodontal care by dentists and patients. The pain associated visual analog scale (VAS) pain scores after ultrasonic scaling. with dentin hypersensitivity during ultrasonic scaling is intolerable The statistical analysis was performed using the paired Student for patient and interferes with the procedure, particularly during t-test and Spearman rank correlation coefficient. supportive periodontal therapy (SPT) for patients with gingival Results: The desensitizing agent reduced the mean VAS pain recession. score from 69.33 ± 16.02 at baseline to 26.08 ± 27.99 after Aim: This study proposed to evaluate the desensitizing effect of application. The questionnaire revealed that >80% patients the oxalic acid agent on pain caused by dentin hypersensitivity were satisfied and requested the application of the desensitizing during ultrasonic scaling. agent for future ultrasonic scaling sessions. Materials and Methods: This study involved 12 patients who Conclusion: This study shows that the application of the oxalic were incorporated in SPT program and complained of dentin acid agent considerably reduces pain associated with dentin hypersensitivity during ultrasonic scaling. We examined the hypersensitivity experienced during ultrasonic scaling. This availability of the oxalic acid agent to compare the degree of pain control treatment may improve patient participation and pain during ultrasonic scaling with or without the application treatment efficiency. Keywords: Oxalic acid, Periodontal health, SPT INTRODUCTION reactions during the treatment makes dental professionals hesitate Dentin hypersensitivity is frequently caused by denudation of root to attach the scaling tip to the root surface, which interferes with surfaces during periodontal treatment [1, 2]. This pain sensation is maintenance therapy. Therefore, studies aiming to reduce dentin caused by thermal, chemical, mechanical, or osmotic stimuli [3]. hypersensitivity during ultrasonic scaling may contribute to maintain During the therapy, gingival tissue recession and extensive root periodontal health. planing may trigger symptoms of dentin hypersensitivity. Because The aim of this study was to evaluate the efficacy of oxalic acid patients with periodontal disease experience progressive alveolar application as a desensitizing agent immediately before ultrasonic bone loss, many patients experience dentin sensitivity. Approximately scaling to reduce the development of dentin hypersensitivity during half of the patients experience dentin hypersensitivity after scaling the subsequent maintenance program. and root planning [4]. This symptom generally interferes with ultrasonic scaling in Supportive Periodontal Therapy (SPT), which MATERIALS AND METHODS may result in the accumulation of dental plaque and negatively A total of 2,460 patients who received periodontal maintenance influence the prognosis after periodontal therapy. at the periodontal department of the Tokyo Medical and Dental The hydrodynamic theory proposed by Brännström [5] is the University Hospital from August 2011 to April 2012 were examined. most accepted mechanism of dentin hypersensitivity [6]. Thermal, Twelve patients with an age range between 39-77 years (mean age tactile, or chemical stimuli on the exposed root surface affect fluid = 59±11) participated in this study. They completed periodontal flow within the dentinal tubules, generating a neural response in active therapy, such as scaling and root planning and periodontal the pulp. The severity of dentin hypersensitivity increases with the surgery, more than 6 months before. The inclusion parameters were number of wider diameter open dentinal tubules [7]. Therefore, it as follows. They must have a minimum of 20 teeth, including some is important to prevent the development of dentin hypersensitivity with dentin hypersensitivity. Selected teeth did not have the lesions, during periodontal treatment. Different types of materials have been such as caries, erosion or wedge-shaped defect and was included designed for dental pulp stimulation, such as bonding adhesive, 5 incisors, 3 canines and 4 molars. These patients should have glutaraldehyde and oxazlate [8]. plaque and calculus removed by ultrasonic scaler during periodontal maintenance and complained of dentin hypersensitivity. Ultrasonic scaling is an essential procedure during periodontal therapy [9] because it effectively eliminates supra- and sub-gingival Following enrollment, the patients were examined for probing pocket plaque or calculus [10,11]. Several sessions are crucial to prevent depth (PPD), clinical attachment level (CAL), recession (REC), tooth recurrence of periodontal infection during maintenance therapy. mobility, bleeding on probing (BOP), gingival index (GI) [12] and However, some patients dislike receiving ultrasonic scaling because plaque index (PlI) [13] of the tooth with hypersensitivity. After clinical of worsening dentin hypersensitivity. In addition, patients’ pain examination, they received ultrasonic scaling and indicated the 46 Journal of Clinical and Diagnostic Research. 2015 Sep, Vol-9(9): ZC46-ZC49 www.jcdr.net Tomonari Suda et al., Effective Pain Analgesic During Ultrasonic Scaling amount of pain related to this treatment using a visual analog scale Overall, the application of the desensitizing agent immediately (VAS) [14]. This score was considered the baseline VAS value. VAS before ultrasonic scaling reduced the pain level to approximately was 10-cm long, with indications of “no pain” and “intolerable pain” 60% of baseline [Table/Fig-1]. The mean VAS score was 69.33 ± on the left and right end, respectively. 16.02 at baseline compared with 26.08 ± 27.99 after application During the next appointment, each patient received the same (p < 0.05). Furthermore, all patients experienced a reduction in VAS treatment immediately after the application of the oxalic acid score in the presence of the desensitizing agent [Table/Fig-2]. We desensitizing agent (Super Seal®, Phoenix Dental Inc., US). First, analysed the relationship between clinical parameter and improving cotton rolls are placed on the vestibule and plaque and saliva value of VAS score. The difference between the baseline VAS value were subsequently removed from teeth surface using a swab. and the post-application VAS value was used as improving score Cotton pellets saturated with the agent were gently rubbed on one of VAS value. Clinical parameters including CAL and REC were not sensitive tooth for 5 seconds. Following application, this situation related with improving score of VAS value (p=0.9906 and p=0.4793, was kept on for one minute. Subsequently, ultrasonic scaling was respectively). initiated, during which the patients were again asked to record their The satisfaction questionnaire, presented as stacked bar charts sensitivity level using the 10-cm VAS (post-application VAS value). [Table/Fig-3], confirmed that approximately 45% subjects The ultrasonic scalers used in this study was selected one of the experienced a noticeable (improved) decrease in pain intensity following devices: Solfy (J. Morita Corp., Tokyo, Japan), ENAC during ultrasonic scaling in the presence of desensitization agent, (Osada Electric Co., Tokyo, Japan), and Mini Piezo (EMS, Nyron, and approximately 90% were satisfied or relatively satisfied by the Switzerland). The patients were treated with the same device treatment. The use of this desensitization agent rendered most and same settings in both treatments by the same investigator. patients (approximately 90%) less apprehensive at the idea of The power setting of each ultrasonic scaler was operated at the their next ultrasonic scaling and willing to repeat this treatment. minimum. After clinical examination, they filled out a questionnaire This study suggests that the application of the desensitization involving questions on this agent. agent on the denuded roots considerably reduces hypersensitivity Ethics: This study was approved by the Ethics Committee of the during ultrasonic scaling treatment, which would improve patient School of Dentistry, Tokyo Medical and Dental University (No. 659). participation and treatment efficiency. All experiment was performed after obtaining written informed consent from the patients. DISCUSSION After the periodontal procedures, optimal plaque control is STATISTICAL ANALYSIS necessary to maintain adequate periodontal conditions [15]. Most The mean baseline and post-application VAS values of the 12 patients suffer from dentin hypersensitivity caused by denuded root patients were compared using the paired Student t-test with Statview surface after nonsurgical and surgical therapy with a prevalence of software (SAS Institute Inc. Cary, NC, USA). The p-values <0.05 62%–90% and from 77%–80%, respectively. The intensity of root were considered statistically significant. Spearman rank correlation sensitivity increases during the first 1–3 weeks following therapy coefficient was used to determine possible correlation between the and subsequently subside over time [16]. It was
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