Journal of Conservative Dentistry

ORIGINAL ARTICLE
Year
: 2022  |  Volume : 25  |  Issue : 1  |  Page : 68--71

Comparison of three different materials used for indirect pulp capping in permanent molars: An in vivo study


KE Selvendran1, A Shafie Ahamed2, Madhuram Krishnamurthy1, V Naveen Kumar1, Vignesh Guptha Raju3,  
1 Department of Conservative Dentistry and Endodontics, Karpaga Vinayaga Institute of Dental Sciences, Kanchipuram, Tamil Nadu, India
2 Department of Conservative Dentistry and Endodontics, Rajah Muthiah Dental College and Hospital, Chidambaram, Tamil Nadu, India
3 Department of Pediatric Dentistry and Preventive Dentistry, Karpaga Vinayaga Institute of Dental Sciences, Kanchipuram, Tamil Nadu, India

Correspondence Address:
Dr. K E Selvendran
Department of Conservative Dentistry and Endodontics, Karpaga Vinayaga Institute of Dental Sciences, Kanchipuram, Tamil Nadu
India

Abstract

Background: Pulp capping should always be considered as the primary treatment of choice for teeth without irreversible pulpitis in lesions approaching dental pulp. The predictability of vital pulp therapy has improved with the introduction of newer bioceramic materials. Aim: The aim of this study was to evaluate the clinical success of Biodentine, calcium hydroxide (CH), and mineral trioxide aggregate (MTA) as pulp capping materials for indirect pulp capping in carious permanent teeth. Materials and Methods: Indirect pulp capping was done for 36 molars of 36 patients with deep caries lesions. They were randomly divided into three groups: Biodentine group (12 teeth), MTA group (12 teeth), and CH group (12 teeth). Patients were recalled at 1, 3, and 6 months to evaluate the clinical success of the treatment outcome. Statistical Analysis: All statistical analysis was performed using SPSS software version 21.0. Pearson's Chi-square test was used to compare the success and failure rates between Biodentine, MTA, and Ca(OH)2 at three different time intervals (30, 90, and 180 days) and also the overall success and failure rates between Biodentine, MTA, and Ca(OH)2 irrespective of the time intervals. P < 0.05 was considered statistically significant. Results: In a statistical trial/study, the pulp capping materials gave different success rates, 91.67% success in the Biodentine group, 83.33% success in the MTA group, and 58.33% success in the CH group. The results were not statistically significant. Conclusion: Indirect pulp capping with calcium silicate materials provided better results compared to that of calcium hydroxide.



How to cite this article:
Selvendran K E, Ahamed A S, Krishnamurthy M, Kumar V N, Raju VG. Comparison of three different materials used for indirect pulp capping in permanent molars: An in vivo study.J Conserv Dent 2022;25:68-71


How to cite this URL:
Selvendran K E, Ahamed A S, Krishnamurthy M, Kumar V N, Raju VG. Comparison of three different materials used for indirect pulp capping in permanent molars: An in vivo study. J Conserv Dent [serial online] 2022 [cited 2022 Aug 15 ];25:68-71
Available from: https://www.jcd.org.in/text.asp?2022/25/1/68/344527


Full Text



 Introduction



Vital pulp therapy is a conservative treatment approach toward teeth with compromised pulp tissue due to dental caries, trauma, and restorative procedures. Treatment options for deep carious lesions differ among dentists and it is still a debate. Complete caries removal has been challenged, and conservative approach is the advised treatment current era. Complete removal of caries-affected dentin is not necessary to terminate the progression of caries. Inadvertent exposure of the pulp in an attempt to completely remove caries would result in direct ingress of microorganisms into the pulp which could substantially reduce the successful outcome. Studies reveal that residual microorganisms in dentin after superficial caries removal could evoke a mild inflammatory response in the pulp which is considered beneficial for pulp regeneration. Management of the deep carious lesion should be aimed at resolution of the inflammation and preservation of pulp vitality.[1]

Indirect pulp capping is a vital pulp therapy procedure in which only infected dentin is removed, leaving a minimal layer of affected dentin as complete removal of affected dentin could lead to pulp exposure and lining the cavity floor with a suitable capping material and to completely seal against microleakage by an intact restoration ensuring complete lesion sterilization and tissue regeneration. Indirect pulp capping is performed in one-step or two-step procedures decided by case selection and clinical requirement.[2]

Researchers are still in search of an ideal material for pulp capping and have made them to evaluate many dental materials. Many materials were investigated for pulp capping, and they are calcium hydroxide (CH), resins, calcium phosphate, zinc phosphate cement, glass-ionomer cement, bioglass, and mineral trioxide aggregate (MTA).[3]

Many materials have been tested and used for deep caries management. CH introduced in 1920 by Herman is still being used and considered as the evidence-based gold standard material for deep caries management. CH is being used due to its high alkaline pH which mainly stimulates the fibroblasts and enzymes. CH promotes healing of pulp tissue by initial formation of matrix with odontoblast-like cells and calcification by mineralization process.[4] Disadvantages of CH are poor marginal seal toward dentin, dissolution, and degradation over time. Dentin formed adjacent to CH can also have tunnel-like defects. Histologically, CH demonstrated cytotoxicity in cell cultures and induced cell apoptosis. CH is dimensionally unstable and will resorb over a period of time.[5]

MTA was introduced in 1993 by modifying Portland cement. MTA consists of tricalcium silicate, tricalcium oxide, tricalcium aluminate, bismuth oxide, and silicate oxide.[3] MTA is a calcium silicate material-based pulp capping material. MTA initiates reparative dentin formation by stimulating growth factors and cytokines. MTA has excellent marginal sealing of dentin.[6] Longer setting time, tooth discoloration potential, and difficulty in handling are constraints for using as an ideal pulp capping material.[7]

Biodentine is a silicate-based cement introduced in 2009 with superior properties. Powder is a mixture of tricalcium silicate, zirconium oxide, and calcium carbonate. Liquid has calcium chloride as an accelerator for setting and a water-reducing agent. It initially sets in 12 min and does not discolor tooth. Biodentine without causing pulpal inflammation promoted reparative dentin formation.[8]

Very few studies have reported on the clinical outcome of indirect pulp capping with Biodentine, CH, and MTA. The trial reported a randomized clinical trial for evaluating the clinical success of three materials, Biodentine, CH, and MTA, used for indirect pulp capping of carious molars.

 Materials and Methods



Study design and sample

The randomized clinical trial was designed with three experimental groups. This clinical trial was performed during November 2018 and October 2020. The clinical trial was assessed and validated by the institutional ethical board and was designed in accordance with CONSORT 2010. The selected patients were adults with age between 19 and 40 years. All patients were explained about the treatment procedure, advantages, disadvantages, and different treatment options before enrolling in the study. Sign was obtained in an informed consent form from all the participants before starting the procedure.

Inclusion criterion

Patients aged between 19 and 40 yearsMolars diagnosed with deep dental caries without pulpal exposurePulpal response on diagnostic tests should be with adjunct to healthy tooth or pulp in reversible pulpitis.

Exclusion criterion

Patients with systemic diseasesTeeth having signs and symptoms related to calcifications in pulp seen in radiograph or internal resorption.

Sample size determination

Sample size was fixed to 12 per group as described by Steven A. Julious; the minimum sample size required for a pilot design is estimated to be 12. Overall, 36 participants were enrolled.

Clinical procedure

Forty patients with deep caries were diagnosed with deep dental caries and 36 patients were selected for the trial. Pulp vitality was assessed by tooth sensitivity tests, thermal test, and electrical stimuli (Digitest II, Parkell, USA). Preoperative radiograph, was taken to assess periodontium and hard tissue. 2% lidocaine hydrochloride local anesthetic solution with epinephrine 1:80,000 (Lignospan, Septodont, France) was administered buccally by infiltration for maxillary teeth and by infra-alveolar nerve block technique for mandibular teeth selected for the experiment. Isolation was achieved with rubber dam (Hygienic; Coltene/Whaledent, USA). Caries was removed manually with spoon excavator and then a sterile BR 31 ball round bur (Mani Inc., Japan) mounted to handpiece. Caries was removed till resistance was felt with hand excavation or the bur. If bleeding occurred in this procedure due to pulp exposure, the pulp-exposed tooth was not incorporated from the trial. The tooth after caries excavation was assigned to one of the three groups by simple randomization technique.

Experimental groups

Group 1: Dycal (Dentsply, USA) was mixed on a paper pad given by the manufacturer. The mixture was placed in the floor of the prepared cavity with plastic filling instrument.

Group 2: MTA (Angelus, Brazil) powder and liquid were manipulated according to manufacturer's guidelines. The manipulated mixture was carried with MTA carrier and placed in the floor of the cavity.

Group 3: Biodentine (Septodont, France) was manipulated according to manufacturer's guidelines. The manipulated mixture was placed in the floor of cavity.

The materials were placed in the floor of the cavity with a thickness ranging between 1 and 2 mm approximately. Provisional restoration with Intermediate Restorative Material (IRM) was completed over the experimental materials. Provisional restoration was removed at 1-month recall visit and restored with direct glass-ionomer cement and occlusion was checked at 1-month recall visit.

Patients were recalled at 1, 3, and 6 months. In follow-up, pulp capped tooth was subjected and assessed by pulp sensitivity tests (cold and electrical) and pain was assessed clinically.

Tooth was declared clinically success if the tooth had no symptoms of disease and responded to sensitivity tests within normal limits.

 Results



A total of 36 patients were included (20 males and 16 females). The details of the patients and teeth enrolled in the trial are shown in [Table 1]. Patients selected and treatment procedure done are shown in [Figure 1]. Twelve molar teeth were indirectly pulp capped with CH, 12 molars with MTA, and 12 molars with Biodentine. Thirty-six molars included for the trial are 8 maxillary molars and 28 mandibular molars.{Table 1}{Figure 1}

The success rate of the experimental materials at various intervals is shown in [Table 2]. Biodentine had a success rate of 100% at 3 months and 91.67% at 6 months, MTA had a success rate of 91.67% at 3 months and 90.91% at 6 months, and CH had a success rate of 75% at 3 months and 77.28% at 6 months.{Table 2}

At 3 months, there were three failures in the CH material group and one failure in the MTA group. At 6 months, four new failures (two in the CH material group, one in the MTA group, and one in the Biodentine group). Treatment was revised and done for the failed cases.

The overall success of Biodentine was 91.67%, MTA was 83.33%, and CH was 58.33%.

 Discussion



The aim of conservative treatment is to preserve the vitality of pulp along with its regular functions. Only a vital and functional pulp can heal on its own by promoting reparative dentin formation and resolving inflammation. Our trial focused on the conservative approach of carious molar pulp capped with newer materials.

This trial was performed to evaluate the efficacy of CH, MTA, and Biodentine in indirect pulp capping of permanent molars by pulp vitality and clinical assessment during 6-month follow-up. CH was included in the trial since it is the gold standard material used nearly a century for pulp capping procedures. CH is known to have many disadvantages, poor adhesion toward dentin, dissolution, and tunnel-like defects in the formed dentin bridge.[9]

However, there is a paradigm shift in the preference of clinicians for pulp capping materials from CH to MTA due to its predictable outcomes.[10] Aeinehchi et al. reported that MTA induction rate of dentinogenic process is better than CH. Few authors have reported the frequency of reparative dentin formation and thickness is better for MTA.[11] MTA has few drawbacks, longer setting time, tooth discoloration, and difficult to handle.[7],[12]

Newer calcium silicate-based materials are developed to overcome the drawbacks of MTA. Biodentine introduced in 2009 is more biocompatible, clinically acceptable setting time, improved mechanical strength, better dentin surface bond, and handling.[13] In our trial, there was 91.67% success in the Biodentine group, 58.33% success in the CH group, and 83.33% success in the MTA group. Nowicka et al. also had compared Biodentine and MTA in premolars without caries planned for extraction due to orthodontic reasons.[8] In their trial, the teeth were caries free and it is known and proved that bacteria are the main reason cause for infection of pulp.[14] In our study, we have attempted to assess the efficacy of three different pulp capping materials in a more challenging clinical scenario where the outcome is unpredictable because of variability in the bacterial load, virulence, and diversity.

Identification of various factors determining the prognosis of pulp capping procedures is important than doing trial in artificial exposures of dentin.[15] Formation of dentin bridge by calcium silicate materials is better than CH and the mechanisms are not known.[16] Calcium silicate materials release CH which does not get dissolved over time like pure CH. Calcium silicate materials induce dentinogenic activity, minimal pulpal inflammation, and stable.[17] Inflammation induced by calcium silicate materials is short term when compared with CH.[18] Although the study's primary disadvantages include a small sample size and a brief assessment time, it was conducted in permanent molars diagnosed with deep dental caries and was clinically assessed. Our results showed s statistically significant difference between the three materials assessed at 6-month follow-up time.

 Conclusion



Clinical success and efficacy of MTA and Biodentine are better than CH and Biodentine is better than MTA for pulp capping procedures. When remaining dentin after caries excavation is minimal, Biodentine can be used as a reliable material for pulp capping procedures.

Acknowledgments

I acknowledge Dr. Mahesh J, MDS, Associate Professor, Department of Public Health Dentistry, Karpaga Vinayaga Institute of Dental Sciences, for his valuable support in statistical analysis.

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.

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