Abstract
This systematic review and meta-analysis aimed to evaluate the success rate of direct pulp capping (DPC) on permanent teeth, comparing the use of MTA with calcium hydroxide and calcium silicate-based cements. A systematic search was carried out in 4 databases until July 2023. The selection was based on PICOS criteria and only randomized clinical trials were included. The risk of bias was assessed using RoB-2 tool, and meta-analyses were performed using RevMan 5.3 software. The overall quality of evidence was determined using the GRADE tool. Thirteen studies were included. Meta-analyses indicated significantly higher success rate for DPC using MTA compared to calcium hydroxide, while no significant difference was observed between MTA and Biodentine, showing a success rate from 80% to 100% even after 3 years of follow-up. Five studies were classified as having high risk of bias and the GRADE assessment revealed low certainty of evidence. DPC is highly effective for permanent teeth when using MTA or Biodentine. There is a need for future well-designed randomized clinical trials to evaluate the efficacy of DPC using newer bioceramic materials.
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Keywords: Bioceramics; Calcium hydroxide; Direct pulp capping; Endodontics; Mineral trioxide aggregate
INTRODUCTION
Direct pulp capping (DPC) is a vital pulp therapy performed when small pulp exposure occurs. Its indication is contingent upon factors such as the cause and dimensions of pulp exposure, the presence of inflammation, and whether bleeding at the site of exposure is controlled [
1,
2]. This procedure involves the application of a dressing material onto the exposed area, with the aim of stimulating reparative dentin formation and the maintenance of pulp vitality [
3]. Therefore, the optimal material should cause minimal or no damage to the pulp, demonstrate biocompatibility, possess antimicrobial activity, and exhibit good sealing ability [
4].
For a long time, calcium hydroxide has been regarded as the prime choice for DPC [
5]. This material has excellent antibacterial properties attributed to its high pH and prompts superficial necrosis within the exposed pulp. This stimulation facilitates repair and the formation of a dentin bridge, in addition to protecting the pulp from thermoelectric stimuli [
6,
7]. However, calcium hydroxide displays pronounced solubility in fluids, along with limited sealing capacity and lack of adhesion, which can impair the success of the DPC [
8,
9,
10].
Calcium silicate-based materials, also known as bioceramics, have been formulated to exceed specific physicochemical requisites in endodontic applications [
11]. Such materials also exhibit an alkaline pH and the ability to release calcium ions, thereby contributing to the reparative and mineralization processes in DPC [
12]. Mineral trioxide aggregate (MTA) was the initial calcium-silicate material developed specifically for endodontic purposes, recognized for its remarkable physicochemical attributes, including the advantage by providing an excellent seal with the tooth structure by a hydration expansion reaction, antibacterial properties, biocompatibility and the ability to stimulate the release of bioactive proteins from the dentin matrix [
13,
14,
15]. Several clinical trials have demonstrated an outstanding success rate ranging from 90% to 100% in DPC procedures using MTA, after 1 year of follow-up [
16,
17,
18,
19,
20].
Recently, new calcium silicate-based cements, such as Biodentine (Septodont, Saint-Maur-des-Fossés, France), have gained prominence attention in the field of endodontology, particularly for vital pulp treatments. These materials are characterized by high biocompatibility, bioactivity, and ability to stimulate dentinogenesis by releasing calcium ions that contribute to dentin bridge formation and pulpal repair [
21,
22]. Additionally, resin-modified calcium silicate materials, such as TheraCal (Bisco, Inc., Schaumburg, IL, USA), have made their way into the market offering a combination of the benefits of calcium silicate cements with the additional advantage of a resin component, enhancing some of the physical properties and handling characteristics [
23]. Both materials have also shown promising results in clinical studies, underscoring their efficacy in DPC procedures [
16,
17,
24].
Recent systematic reviews with meta-analyses assessed the efficacy of DPC on permanent teeth, comparing the use of MTA with using calcium hydroxide or other silicate-based cements [
25,
26]. However, those reviews only included studies that assessed teeth with cariously exposed pulps and included few randomized clinical trials (RCTs). For this reason, the evidence regarding the success rate of DPC on permanent teeth using the evaluated materials remains inconclusive. In the hierarchy of evidence, systematic reviews of RCTs offer the highest level of certainty [
27]. Therefore, the current study aimed to carry out a systematic review of RCTs to answer the following question: what is the success rate of DPC performed on permanent teeth using MTA, compared to DPC performed using calcium hydroxide or other calcium silicate-based material?
MATERIALS AND METHODS
Protocol and registration
The protocol for this systematic review was registered in the PROSPERO database (CRD42023432260) and followed the recommendations of the PRISMA (Preferred Reporting Items for Systematic Reviews) 2020 guidelines [
28].
This systematic review was based on the main question: what is the success rate of DPC performed on permanent teeth using MTA, compared to using calcium hydroxide or other calcium silicate-based material? The null hypothesis tested was that there is no significant difference in the success rate among the different materials.
Search strategy
A systematic search was carried out by 2 independent reviewers (G.R.S. and K.P.P.) in PubMed, Cochrane Library, Scopus and Web of Science databases. The search was conducted without restrictions until July 2023. The search strategy employed a combination of Medical Subject Heading (MeSH) terms and text words related to the study topic, including MTA (MeSH), mineral trioxide aggregate (MeSH), bioceramic, calcium hydroxide, pulp capping (MeSH), vital pulp therapy, permanent teeth, mature teeth, permanent dentition (MeSH), and secondary dentition. The search terms were combined using the Boolean operators ‘AND’ and ‘OR’ to create the search strategies for each database (
Supplementary Table 1). A final screening process involved a manual examination of the references of the selected studies and an additional search on Open Grey.
1. Inclusion criteria
The inclusion criteria for this systematic review were established using the PICOS strategy, as follows [
28,
29]:
• P (population): Mature or immature permanent teeth submitted to DPC due to caries, trauma or restorative procedures.
• I (intervention): DPC using MTA.
• C (comparison): DPC using calcium hydroxide or other calcium silicate-based cements.
• O (Result): Success rate based on clinical and radiographic evaluations with at least 6 months of follow-up.
• S (Study design): RCTs.
The clinical assessment required evaluating at least 2 of the following symptoms: pain, swelling, tenderness to percussion, edema, or increased mobility. For the radiographic assessment, at least 2 of the following indicators needed to be examined: presence of periapical lesions, periodontal ligament widening, root formation continuity, or root resorption.
2. Exclusion criteria
Preliminary studies, non-randomized controlled trials, and articles that were not relevant to the study topic were excluded.
The articles retrieved from the initial search were imported into Endnote X9 software (Thomson Reuters, New York, NY, USA) to remove duplicates. Then, the articles were exported to an Excel sheet and their titles and abstracts were analyzed independently by 2 authors (G.R.S. and K.P.P.). Potential studies were reviewed in full and independently evaluated by the authors (G.R.S. and K.P.P.) to determine their eligibility. In case of discordance, a third author (E.J.N.L.S.) was consulted to make the final decision.
Data extraction
The following information was extracted from each included study by 2 independent authors (G.R.S. and K.P.P.): author and year, teeth, root status (mature or immature teeth), patients age, cause of pulp exposure, pulpal diagnosis, material of comparison, sample size, temporary restorative material, permanent restorative material and time of restoration, follow-up time and success rate, and main findings. Any disagreement was resolved by a third author (E.J.N.L.S.).
Quality assessment
The quality of the included studies was assessed by 2 independent authors (G.R.S. and K.P.P.) using the Cochrane Collaboration tool RoB-2 [
30]. The RoB-2 tool assesses the following 5 domains: randomization process, adherence to intended interventions, missing outcome data, outcome measurement, and reported outcome selection. Each domain was classified as having ‘low risk,’ ‘unclear risk’ or ‘high risk.’ The overall risk of bias in a study was considered as ‘low risk’ if all domains were assessed as ‘low risk,’ ‘unclear risk’ if one or more domains were assessed as ‘unclear risk’ or ‘high risk’ if one or more domains were classified as ‘high risk.’ In case of discordance between the 2 evaluators, a third author (E.J.N.L.S.) was consulted.
RevMan software (Version 5.3, The Cochrane Collaboration) was used to conduct the meta-analyses, with forest plots generated to compare the success rates of DPC with MTA against calcium hydroxide and calcium silicate-based cements at various follow-up intervals, provided when at least 2 studies were available for data aggregation. Success rates were calculated based on the number of successful cases versus the total cases and were presented as dichotomous data. The effect of the intervention was estimated using odds ratios with corresponding 95% confidence intervals (CIs).
Chi-square test was used to detect statistical heterogeneity with p value set at < 0.10. I2 statistics was used to assess the degree of heterogeneity with > 25%, > 50%, and > 75% indicating low, moderate, or high degree of heterogeneity, respectively. Fixed-effect models were utilized in case of low heterogeneity, while random-effect models were used in case of moderate or high heterogeneity.
Grading of evidence
The Grading of Recommendations, Assessment, Development, and Evaluation (GRADE) tool (GRADEpro, McMaster University, Hamilton, ON, Canada) was used to evaluate the certainty of evidence in this systematic review. Two reviewers (K.P.P. and E.J.N.L.S.) assessed the 5 domains and each of them was rated as ‘not serious,’ ‘serious,’ or ‘very serious.’ The overall certainty of evidence was categorized into ‘very low,’ ‘low,’ ‘moderate,’ or ‘high’ based on established criteria [
31,
32,
33,
34,
35].
RESULTS
Study selection
The initial search resulted in the retrieval of 771 studies (
Supplementary Table 1,
Figure 1). After removing duplicate articles, 441 studies underwent title and abstract screening. From these, 19 studies were considered eligible and were read in full. After applying the eligibility criteria, 6 studies were excluded (
Figure 1) and 13 studies were included in the present systematic review [
16,
17,
18,
19,
20,
24,
36,
37,
38,
39,
40,
41,
42]. No additional relevant study was found after screening the references of the selected studies or searching on OpenGray.
Figure 1PRISMA flow diagram.
Data extraction
Table 1 displays the data extracted from the 13 studies included in this review. The primary material for comparison was calcium hydroxide, followed by Biodentine, with Endocem (Maruchi, Wonju, Korea) and TheraCal also undergoing evaluation. In relation to the MTA brand, most studies used ProRoot MTA (Dentsply, Tulsa, OK, USA), while 4 studies used MTA Angelus (Angelus, Londrina, Brazil) and 1 study used MTA Plus (Cerkamed, Stalowa Wola, Poland). One study did not mention the MTA’s brand [
16,
17,
18,
24,
36,
42]. Permanent restoration was performed immediately or within timeframes of 24 hours, 7 days, 1 month or 3 months and the most used permanent material was composite resin. The maximum follow-up period was extended up to 72 months.
Table 1Data from the included studies
|
Author and year |
Teeth |
Mature or immature teeth |
Patients age |
Cause of pulp exposure |
Pulpal diagnosis |
Material of comparison |
Sample size |
Temporary restorative material |
Permanent restorative material and time of restoration |
Follow-up time and success rate |
Main findings |
|
Hilton et al. (2013) [38] |
ND |
ND |
7 yr or more |
Caries, trauma or mechanical exposure |
Excluded spontaneous pain |
CH |
336 (n = 181 for CH and 195 for MTA) |
Resin-modified GIC |
Final restorations were performed as deemed appropriate by the dentist |
24 mon
|
The success rate using MTA was significantly higher compared to CH. |
|
MTA: 80.3%, CH: 68.5% |
|
Jang et al. (2015) [39] |
Incisors, premolars and molars |
ND |
19–79 yr |
Trauma or caries |
Included only reversible pulpitis |
Endocem |
46 (n = 23 for each group) |
MTA: IRM |
Direct resin, inlay or overlay or single crown 3 mon after DPC |
12 mon
|
There was no statistically significant difference between groups. |
|
Endocem: Resin-modified GIC |
MTA: 86.96%, Endocem: 83.33% |
|
Kundzina et al. (2017) [40] |
Molars |
Mature |
18–55 yr |
Caries |
Excluded irreversible pulpitis |
CH |
70 (n = 33 for MTA and 37 for CH) |
GIC |
Composite resin 1 wk after DPC |
36 mon
|
The success rate using MTA was significantly higher compared to CH. |
|
MTA: 85%, CH: 52% |
|
Brizuela et al. (2017) [37] |
Molars |
Mature or immature |
7–16 yr |
Caries |
Included normal pulp and reversible pulpitis |
CH and BD |
169 (n = 53 for CH, 56 for MTA and 60 for BD) |
ND*
|
GIC + Composite resin immediately |
6 mon
|
There was no statistically significant difference between groups. |
|
CH: 93.11%, MTA: 91,89%, BD: 100% |
|
12 mon
|
|
CH: 86.36%, MTA: 86.36%, BD: 100% |
|
Katge and Patil (2017) [18] |
First molars |
ND |
7–9 yr |
Caries, pulp exposure during caries excavation |
Excluded spontaneous pain |
BD |
42 (n = 21 for each group) |
MTA: Resin-modified GIC |
Composite resin 3 mon after DPC |
6 mon
|
There was no statistically significant difference between groups. |
|
BD: All cavity filled with BD |
MTA: 100%, BD: 100% |
|
12 mon
|
|
MTA: 100%, BD: 100% |
|
Linu et al. (2017) [41] |
Mandibular molars |
ND |
15–30 yr |
Caries |
Excluded spontaneous pain |
BD |
30 (n = 15 for each group) |
MTA: Resin-modified GIC |
Composite resin 1 wk after DPC |
18 mon
|
There was no statistically significant difference between groups. |
|
BD: All cavity filled with BD |
MTA: 84.6%, BD: 92.3% |
|
Parinyaprom et al. (2018) [19] |
ND*
|
Mature or immature |
6–18 yr |
Caries |
Included normal pulp, reversible or irreversible pulpitis |
BD |
55 (n = 27 for MTA and 28 for BD) |
MTA: Resin-modified GIC |
Composite resin immediately |
18 mon
|
There was no statistically significant difference between groups. |
|
BD: All cavity filled with BD |
MTA: 92.6%, BD: 96.4% |
|
Awawdeh et al. (2018) [16] |
Incisors, premolars and molars |
Mature |
16–51 yr |
Caries |
Included only reversible pulpitis |
BD |
68 (n = 34 for each group) |
IRM |
Amalgam or composite resin 7 days after DPC |
6 mon
|
There was no statistically significant difference between groups. |
|
BD: 100%, MTA: 100% |
|
12 mon
|
|
BD: 100%, MTA: 100% |
|
24 mon
|
|
BD: 100%, MTA: 100% |
|
36 mon
|
|
BD: 93.3%, MTA: 100% |
|
Suhag et al. (2019) [20] |
Molars |
Mature |
15–40 yr |
Caries |
Included only reversible pulpitis |
CH |
64 (n = 32 for each group) |
MTA: IRM |
MTA: Resin-modified GIC after 24 hr |
12 mon
|
The success rate using MTA was significantly higher compared to CH. |
|
CH: Resin-modified glass ionomer + Composite resin immediately |
MTA: 93%, CH: 69% |
|
Peskersoy et al. (2021) [24] |
Molars |
ND |
18–42 yr |
Caries |
Included only reversible pulpitis |
BD, Theracal LC, conventional CH and light-cured CH (LC Calcihyd) |
525 (n = 105 for each group) |
ND |
Composite resin immediately |
6 mon
|
The success rate using all calcium silicate-based cements was significantly higher than CH cements. |
|
MTA: 86%, BD: 84%, Theracal LC: 81%, CH: 76%, LC Calcihyd: 66% |
|
12 mon
|
|
MTA: 86%, BD: 80%, Theracal LC: 73%, CH: 72%, LC Calcihyd: 64% |
|
36 mon
|
|
MTA: 86.3%, BD: 79.4%, Theracal LC: 72.1%, CH: 69.4%, LC Calcihyd: 61% |
|
Agrawal Aanchal et al. (2021) [36] |
Molars |
ND |
15–52 yr |
Caries |
Excluded irreversible pulpitis |
CH |
45 (n = 15 for each group) |
MTA: IRM |
Policarboxilate liner + Silver amalgam |
6 mon
|
There was no statistically significant difference between groups. |
|
CH: immediately |
MTA: 100%, CH: 100% |
|
MTA: 24 hr after DPC |
|
Holiel et al. (2021) [17] |
Premolars and molars |
ND |
18–40 yr |
Accidental traumatic pulp exposure |
Excluded spontaneous pain |
BD |
45 (n = 15 for each group) |
ND |
Resin-modified GIC + Composite resin immediately |
24 mon
|
There was no statistically significant difference between groups. |
|
MTA: 100%, BD: 100% |
|
Selvendran et al. (2021) [42] |
Molars |
ND |
19–40 yr |
Caries |
Included healthy pulp or reversible pulpitis |
CH and BD |
36 (n = 12 for each group) |
IRM |
After 1 mon |
6 mon
|
The success rate using MTA or BD was significantly higher than CH. |
|
BD: 91.67%, MTA: 81.82%, CH: 44.44% |
For direct capping using calcium hydroxide, success rates ranged from 44% to 100% at 6-month follow-up, 69% to 86% at 12-month, and 52% to 69% at 36-month. Regarding DPC with MTA, success rates varied from 81% to 100% at 6-month follow-up, 86% to 100% at 12-month, 84% to 92% at 18-month, 80% to 100% at 24-month, and 85% to 93% at 36-month. For Biodentine, success rates varied from 83% to 100% at 6-month follow-up, 80% to 100% at 12-month, 92% to 96% at 18-month, and 79% to 100% at 36-month follow-up. Endocem demonstrated a success rate of 83% at 12-month follow-up, and Theracal displayed success rates of 81% at 6-month follow-up, 73% at 12-month, and 72% at 36-month. The success rate was based on a combined assessment of clinical and radiographic evaluations. The separate success rates for clinical and radiographic assessments were not analyzed because of insufficient data from various studies.
Quality assessment
The risk of bias for the 13 included studies is depicted in
Figure 2. Five studies were considered as having high risk of bias in the domain of “deviations from intended interventions” [
18,
24,
37,
41,
42]. The high-risk studies failed to consider potential dropouts during follow-up when calculating sample size or failed to assess how these dropouts could impact the study outcome. In addition, 1 study was considered as having high risk of bias and 2 studies were considered as having unclear risk of bias in the domain “randomization process” [
24,
39,
41]. In these studies, the randomization was not described or performed by one of the study organizers at random. The other 7 studies were considered as having low risk of bias, as none of the evaluated biases was detected [
16,
17,
19,
20,
36,
38,
40].
Figure 2Risk of bias assessment.
Meta-analysis
Different meta-analyses were performed to compare the success rate of DPC using MTA with different materials of comparison. Calcium hydroxide and Biodentine were the only materials evaluated in at least 2 studies. Endocem and TheraCal were evaluated in only 1 study each and, therefore, could not be included in the meta-analyses.
Figures 3 illustrate the meta-analyses for the MTA x calcium hydroxide comparison at 6-, 12- and 36-month follow-ups, respectively. Notably, the success rate for direct capping in permanent teeth using MTA was significantly higher than that of calcium hydroxide at all time points (6-months:
p = 0.01; 12-month:
p = 0.002; 36-month:
p = 0.0002).
Figure 4 exhibit the meta-analyses of the comparison MTA and Biodentine at 6-, 12-, 18- and 36-month follow-ups, respectively. No statistically significant differences were observed between MTA and Biodentine (6-months:
p = 0.72; 12-month:
p = 0.21; 18-month:
p = 0.39; 36-month:
p = 0.23).
Figure 3
Forest plots of success cases of pulpotomy with MTA and calcium hydroxide at (A) 6-months follow-up, (B) 12-months follow-up and (C) 36-month follow-up showing that the success rate of pulpotomy on permanent teeth was significantly higher when using MTA compared to calcium hydroxide.
MTA, mineral trioxide aggregate; CI, confidence interval.
Figure 4
Forest plots of success cases of pulpotomy with MTA and Biodentine at (A) 6-months follow-up, (B) 12-month follow-up, (C) 18-month follow-up and (D) 36-month follow-up showing no significant differences in the success rate between the 2 materials.
MTA, mineral trioxide aggregate; CI, confidence interval.
While the etiology of pulp exposure, root maturation level, and restoration methods are recognized as variables that could impact the efficacy of DPC, it was not possible to perform statistical analysis on their influence on success rate. This is due to the fact that only 1 study exclusively assessed accidental traumatic pulp exposure, no study focused solely on immature teeth, and considerable diversity existed in restorative approaches among the included studies [
17].
The certainty of evidence for the included studies was rated low (
Table 2). The ‘risk of bias’ domain was rated as ‘serious’ due to some studies having limited control over confounding factors in both their design and statistical analysis [
31]. Conversely, the ‘inconsistency’ domain was rated as ‘not serious,’ given that the results were consistent and free from unexplained heterogeneity [
33]. The ‘indirectness’ domain was also rated as ‘not serious’ because the studied populations were representative of those who would receive the recommended interventions and relevant patient outcomes were assessed [
34]. The ‘imprecision’ domain was rated as ‘very serious’ due to the pooled sample size in most meta-analyses being under 300, with 95% confidence intervals including both significant benefit and harm (OR under 0.75 or over 1.25) [
32]. While there were not enough studies for a quantitative assessment of publication bias using funnel plots or regression tests, publication bias was not deemed significant enough to lower the quality of evidence. This assessment was supported by the inclusion of studies from indexed and non-indexed journals and without any funds from the private sector [
35].
Table 2Assessment of the quality of evidence
|
Certainty assessment |
|
Participants (studies) |
Risk of bias |
Inconsistency |
Indirectness |
Imprecision |
Publication bias |
Overall certainty of evidence |
|
1,531 (13 RCTs) |
Seriousa
|
Not seriousb
|
Not seriousc
|
Very seriousd
|
Nonee
|
⊕⊕○○ |
|
LOW |
DISCUSSION
The primary aim of this systematic review was to assess the success rate of DPC on permanent teeth using MTA, in comparison to both calcium hydroxide and other calcium silicate-based cements. The studies included in the present systematic review demonstrated success rates exceeding 80% for MTA and over 70% for the calcium silicate-based cements Biodentine, Endocem and TheraCal, even after 3 years of follow-up. This indicates the effectiveness of these materials used in vital pulp therapy on permanent teeth. In contrast, the studies revealed a significantly lower success rate when using calcium hydroxide, a finding confirmed by the meta-analyses. Therefore, the null hypothesis was rejected.
Over the last decades, calcium hydroxide has been considered the gold standard material for DPC, given its excellent physicochemical properties that stimulate pulp repair [
43]. Despite its extensive application in DPC, studies have shown that calcium hydroxide has weak bonding to dentin, low mechanical strength, and high solubility and degradation over time, resulting in suboptimal sealing [
8,
10]. In fact, the present meta-analyses indicated that the difference in success rates between MTA and calcium hydroxide increased overtime, with odds ratios of 2.22 at 6 months, 2.69 at 1 year and 3.00 at 3 years. Moreover, several studies show tunnel-like defects in calcium hydroxide-induced reparative dentin formation [
8,
10,
44]. In contrast, MTA has shown promising results for DPC. Unlike calcium hydroxide, MTA has excellent sealing ability, long-term stability and low solubility, in addition to resulting in less pulpal inflammation and better dentin bridge formation [
44,
45,
46].
The outcomes of this systematic review revealed no significant difference in the success of DPC on permanent teeth when comparing the use of MTA with Biodentine. Both MTA and Biodentine yielded success rates ranging from 80% to 100%, even after a 3-year span of DPC [
16,
24]. A recent systematic review has also demonstrated a similar success rate when employing either MTA or Biodentine in pulpotomy procedures on permanent teeth [
47]. Biodentine shows excellent physio-chemical properties, including biocompatibility, bioactivity, and adhesion to dentin. Furthermore, its simpler manipulation and handling, facilitated by automatic mixing using a capsule amalgamator, obviates the likelihood of manipulation and proportion errors that commonly occur with other materials [
48].
Endocem and TheraCal, other calcium silicate-based cements, underwent an examination in only 1 study each included in the present review. Consequently, they could not be included in the conducted meta-analyses. However, the results of the included studies also demonstrated no statistically significant difference in the outcomes when comparing the use of MTA with Endocem [
39]. However, MTA showed a significantly better success rate compared to TheraCal after 1 and 3 years of follow-up [
24]. Thus, more long-term studies are needed to evaluate the effectiveness of these materials for DPC on permanent teeth.
In the present systematic review, it was not possible to perform statistical analysis to assess the influence of factors such as the cause of pulp exposure, root maturity status, and restoration procedures on the success rate of DPC. This limitation arises because only 1 study exclusively examined accidental traumatic pulp exposure, none of the studies focused solely on immature teeth, and there was considerable variability in restorative procedures [
17]. In fact, most of the studies included in this review did not differ between permanent teeth with open or closed apex, although some studies included children and teenagers. It is well-established that young teeth with open apex possess greater blood supply, ensuring greater resistance to pulp infection [
49]. However, the consistently high success rate observed in DPC studies, even when considering age groups suggests that this procedure can be highly effective regardless of the stage of root development.
Most studies included in this review did not provide relevant data concerning factors that may influence both the indication and outcome of DPC, such as the location and dimensions of pulp exposure, as well as the extent of bleeding at the exposure site [
1,
2]. In carious-exposed pulps, a higher frequency of pulp exposures, larger pulp exposures and pronounced bleeding have been linked to a worse prognosis for DPC [
1,
2]. These variables are predictive of more extensive pulp damage and underscore the critical nature of accurate clinical diagnosis. One of the included studies showed that pulpal exposure in class V cavities resulted in a significantly higher failure rate (50%) compared to class I, II, and III cavities (5.3%) [
39]. Regarding the size of pulpal exposure, only 2 studies specified that exposures were up to 2 mm
2, while the others did not assess this parameter [
17,
42]. Two studies reported homeostasis times up to 3 minutes and 4 minutes, both showing high success rates for DPC using MTA or Biodentine, exceeding 92% [
16,
19]. Studies indicating homeostasis time of approximately 10 minutes showed success rates for MTA, Biodentine, or Endocem of over 80% [
20,
36,
37,
39,
40,
41,
42]. These high success rates highlight the importance of an accurate diagnosis, as nearly all studies excluded patients with signs and symptoms of irreversible pulpitis.
The solutions used to achieve hemostasis with moistened cotton pellets also varied widely among the included studies. Sodium hypochlorite was the most commonly used solution, with concentrations ranging from 0.5%, 2.5%, 3%, 5%, to 5.25% [
16,
19,
20,
36,
38,
39,
40,
41]. Saline was also used in some studies, and 1 study managed pulpal bleeding with 2% lidocaine with adrenaline [
17,
18,
24,
37,
42]. No differences in success rates were observed among the calcium-silicate-based cements based on the solution used, but the study that employed anesthetic reported the lowest success rate with calcium hydroxide among all studies. Furthermore, a pivotal factor influencing the success of DPC is the restorative procedure. A recent study observed that the main variable impacting the outcome of DPC using calcium hydroxide was the quality of the coronal restoration [
2]. In the present review, a lack of standardized methodology in restorative procedures was observed in the included RCTs. Several studies employed a temporary restoration, followed by permanent restoration at intervals of 7 days, 1 month or 3 months [
10,
16,
18,
39,
41,
42]. However, the latest position statements from both the European Society of Endodontology [
3] and the American Association of Endodontists (AAE) [
50] concerning vital pulp therapies advocate for the immediate restoration of the tooth after DPC. This recommendation is aimed at averting microleakage, protecting the biomaterial and reducing post-operative sensitivity and thermal conductivity [
50].
The present systematic review and meta-analysis has some limitations. The high risk of bias identified in 5 out of the 13 studies included in the present review, the high heterogeneity in methodologies and follow-up times among the included studies, and the lack of control over confounding factors, along with the absence of relevant data, can influence the outcome of DPC within the reviewed studies. Moreover, GRADE analysis indicates an overall low certainty of the evidence, underscoring the need for a cautious interpretation of the present findings. Therefore, the present review highlights the necessity for well-designed future randomized clinical trials focused on evaluating the long-term results of direct capping using newer bioceramic materials.
CONCLUSIONS
The present findings showed that DPC is highly effective for permanent teeth when using MTA or Biodentine. The certainty of the evidence was low and there is a need for future well-designed randomized clinical trials to evaluate the efficacy of DPC using newer bioceramic materials.
-
Conflict of Interest: No potential conflict of interest relevant to this article was reported.
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Author Contributions:
Conceptualization: Pinto KP, Silva EJNL.
Data curation: Pinto KP, Silva GR, Ferreira CMA.
Formal analysis: Pinto KP.
Investigation: Pinto KP, Silva GR.
Methodology: Pinto KP, Silva GR, Ferreira CMA.
Project administration: Pinto KP, Sassone LM, Silva EJNL.
Resources: Sassone LM, Silva EJNL.
Software: Pinto KP.
Supervision: Pinto KP, Silva EJNL.
Validation: Pinto KP, Silva EJNL.
Writing - original draft: Pinto KP, Silva EJNL.
Writing - review & editing: Sassone LM, Silva EJNL.
SUPPLEMENTARY MATERIAL
REFERENCES
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KACD
, Gabriela Ribeiro da Silva1
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