Prevalence and gender comparison of children requiring class I restorations in primary mandibular secondmolars-A retrospective study

Dental caries is a worldwide health problem and about 621 million children are affected around the world. The most common type of caries that affects the children are the class 1 caries, given by GV blacks classi ication. Pediatric restorations of the various lesions are commonly done using GIC and composite. Posteriors molars are more prone to caries when compared to the anteriors as they have deeper pits and issures. This research aims on the assessment of prevalence of class I restorations using GIC and gender comparison of the class 1 restorations in the second molars of pediatric patients between 512 years. The study was performed in the outpatient department of Pediatric andPreventiveDentistry. Data required for the studywas procured by reviewing the patient records visiting the dental college. The datawas sorted in excel and statistically analysed using the IBM SPSS software analysis and the results interpreted in graphs and tabulations. Results revealed that prevalence of GIC restorations were 41.16% and Composite restorations were 58.54% in all the primary teeth. Distribution of GIC and composite restorations on the primary mandibular secondmolars revealed prevalence of GIC restorations as 57.27% and prevalence of composite restorations as 42.73%. Association of gender and types of restorations among children reveals distribution of GIC restorations as 55.11%amongmales and44.89%among females and the distribution of composite restorations as 50.62%amongmales and49.38%among females respectively. This differencewas statistically signi icant (p=0.001). Within the limitations of the current study, glass ionomer restorationswere higher in primary mandibular second molars when compared to composite restorations. On gender comparison, females received higher composite restorations when compared to males who received a Glass ionomer cement restorations.


INTRODUCTION
Dental caries is a highly prevalent worldwide health problem, representing the most common infectious disease in the paediatric population affecting about 621 million children around the world (Weiss et al., 2003). It has multifactorial etiology which leads to initiation and progression of the lesion (Subramanyam et al., 2018), out of which most common ones include high sugar diet, dental plaque (Govindaraju and Gurunathan, 2017) and bacterial invasion. The most common type of caries that affects the children are the class 1 caries, given by GV blacks classi ication. Class 1 caries, According to GV Blacks are the caries on the pits and issures of molars and lingual pits of all teeth (Gilbert, 1982). The contemporary management of dental caries encompasses identi ication of an individual risk for caries progression, understanding of the disease process and active surveillance to assess disease progression and manage with appropriate preventive services, supplemented by the most adequate restorative therapy when indicated (Ruff et al., 2018). Management of dental caries is essential as children who suffer from poor oral health are 12 times more susceptible to have lesser activity days than those who do not (Gurunathan and Shanmugaavel, 2016). It also can affect their life in many different aspects. The awareness of oral hygiene measures such as proper brushing techniques, adequate luoride intake, and luoride gel application are thus important areas of emphasis (Mahesh and Masitah, 2018).
The bene its of restorative therapy include removal of cavitation or defects to eliminate areas that are susceptible to caries; stopping the progression of tooth demineralization; restoring the integrity of tooth structure; preventing the spread of infection into the dental pulp; and preventing the shifting of teeth and space loss due to loss of tooth structure. The risks of restorative therapy include lessening the longevity of teeth by making them more susceptible to fracture, recurrent lesions or cystic lesion such as ranula (Packiri, 2017), restoration failure (Downer et al., 1999) pulp exposure during caries excavation, future pulpal complications and iatrogenic damage to adjacent teeth (Lenters et al., 2006). Tinanoff N et al. in 2001 revealed that carious restorations are 62% more in molars when compared to other teeth . Similar indings were obtained in a study by Frankl SN et al. in 1992, where posterior teeth were the most affected tooth by carious lesions especially from 6-12 years of age (Ricketts et al., 2013).

Previous research by
Research by Gao et al. in 2018 showed that resin modi ied GIC and resin composites are the most recommended paediatric restorative materials, as they have better Esthetics and increased wear resistance (Gao, 2018). Research by Anderson M et al. in 2002 revealed that Materials such as glassionomers, resin ionomers, resin ionomer products, and improved resin-based composite systems had been developed which are having profound impact on the restoration of primary teeth, particularly the treatment of caries on the posterior teeth. The principal advantage of these new materials is that they require less retention form, and this is particularly important in primary teeth to conserve the relatively thin enamel that could help prevent subsequent caries invasion of dentin (Anderson, 2002). However, the previous studies could not associate gender with class 1 restorations and this research aims to overcome the challenges.
This research emphasises on the assessment of prevalence of class I restorations using GIC and gender comparison of the class 1 restorations in the second molars of pediatric patients between 5-12 years.

MATERIALS AND METHODS
The study was performed as a retrospective study under a university setting in the outpatient department of Pediatric and Preventive Dentistry. The advantages of this study include available data, population of various strata of society while the disadvantages account for the study being unicentric, geographical trends not assessed. Ethical approval was obtained from institutional ethical committee (ethical approval number: SDC/SIHEC/2020/DIASDATA/0619-0320).
Data required for this was procured by reviewing the patient records of about 86000 patients visiting the dental college. The sample was collected from June 2019 to March 2020. Dental Information Archiving Software is the database system used in college to record all the details of the patient, which includes their demographic data, photographs, diagnosis and treatment reports. The total sample size of the study is 1127 collected using the college database, out of which according to the inclusion and the exclusion criteria, the samples were grouped accordingly. To eliminate bias, simple random sampling was done to narrow down the sample size to 923. Veri ication of the data was done with the presence of additional reviewers procedure notes and photographs of application of luoride. Strati ication and randomisation were done to minimise sampling error. Data that were incomplete were excluded. There is high internal validity and less external validity for the study. The obtained data were tabulated in excel systematically. Data were then entered in the SPSS analysis software and descriptive analysis and correlation statistics performed. The obtained results were tabulated and graphically represented.

RESULTS AND DISCUSSION
Prevalence of GIC restorations are 41.16% (n=4143) and Composite restorations are 58.54% (n=5921) ( Figure 1) which shows that composite restorations are generally more prevalent when compared to GIC. Distribution of GIC and composite restorations on the primary mandibular second molars revealed prevalence of GIC restorations as 57.27% (n=923) and prevalence of composite restorations as 42.73% (n=688) (Figure 2), thereby an increased number of GIC restorations on primary mandibular second molars. Further, association of gender and types of restorations among children reveals distribution of GIC restorations as 55.11% among males (n=2283) and 44.89% (n=1860) among females and the distribution of composite restorations as 50.62% (n=2997) among males and 49.38% (n=2924) among females respectively. Children who were Males received more glass ionomer restorations when compared to females, who received more composite restorations which were statistically significant. Chi-square test between gender and types of restorations among pediatric patients reveals p value<0.05 statistically signi icant (Figure 3).

Figure 1: Pie chart representing the distribution of GIC and composite restorations among the children requiring class I restorations in all primary teeth
In Figure 1, Blue colour denotes GIC restorations and Red colour denotes composite restorations. Among the restorations, higher percentage of children received composite restorations than glass ionomer cement restorations. In Figure 2, Blue colour denotes glass ionomer cement restorations and Red colour represents composite restorations. Among the restorations in primary mandibular second molars, glass ionomer restorations were more prevalent than composite restorations. In Figure 3, X-axis represents gender and Y-axis represents the number of patients. Blue colour denotes glass ionomer cement restorations and Red colour rep- Caries is a multifactorial bacterial disease that has been identi ied as a worldwide epidemic (Somasundaram et al., 2015). Complete knowledge of caries in pediatric patients and also other aspects such as the type of caries progression, frenal attachment type (Christabel, 2015), presence of any malocclusion is important for a pediatric dentist In paediatric dentistry, the most important concern is the loss of carious primary molars leading to space loss (Jeevanandan, 2017). The objective of treating an infected primary tooth is to retain it till physi-ologic exfoliation to guide the erupting permanent teeth (Govindaraju et al., 2017a). In other words, it is a natural space maintainer (Panchal et al., 2019). Further, primary teeth play an imperative role in the self esteem of the preschool children and also plays a pivotal role in speech development, esthetics and function (Ravikumar et al., 2017). Restoration of the primary molars is thus essential before it becomes grossly decayed and the choice of treatment left is pulpectomy (Jeevanandan and Govindaraju, 2018), to treat the necrosed pulp due to caries (Lakshmanan et al., 2020). Further, Pulpectomy is challenging and time consuming (Govindaraju et al., 2017b) and it is the only choice left to save the teeth from extraction and maintain its form and function (Govindaraju et al., 2017c) Thus it is better to restore it in early stages of disease using materials such as GIC and composites. Study of its prevalence and knowledge is thus essential for a dentist and this study aims to throw some limelight on the same.
Results obtained in our study for prevalence of GIC restorations revealed that Composite has a greater prevalence over GIC restorations. Supporting our results, a study by Manhart J et al. in 2013 stated that the success rate of Class I and II composite restorations is always higher than the success rates of class I and class II GIC restorations (Manhart et al., 2000). However, Dhar Vineet et al. in 2015, in his study, showed that glass ionomer cement or resinmodi ied glass ionomer cement is the ideal restorative material for primary dentition, as it has several advantages such as Adhesion to enamel and dentin, Anticariogenic effect, Low solubility, Biocompatibility and Less technique sensitivity . Our study indings, thereby, are in concordance with similar articles. The reason for increased prevalence of composite restorations over GIC restorations is due to its properties such as Esthetics, Conserves tooth structure, Adhesion, Low thermal conductivity, Universal application, Ease of manipulation and easily Repairable (Rodrigues et al., 2019). In the patient's point of view, aesthetic concerns of parents and increased strength of composites, and compromised luoride release are the prime reasons for opting composites over GIC restorations.
Results obtained in our study for the prevalence of class I GIC restorations revealed that Glass ionomer cement was the most prevalent type of restoration. Similar results were obtained in the study by Ranjdar Mahmood Talabani et al. in 2015 stating that class I occlusal surface caries has the maximum prevalence among pediatric patients, thereby supporting our results (Talabani et al., 2015). Opposing results were seldom found as it is clearly seen that the class I restorations are the most common among the children. The Reason for class I caries is due to the presence of lesser smooth surface caries owing to better oral hygiene measures.
Association of class I restorations in primary mandibular second molars and gender revealed Male predominance with class I restorations in primary mandibular second molars in our study. Supporting our results, EK Zorić et al. in 2014 revealed that Males had a greater number of restorations than females (Zorić et al., 2014), while the study by Shaffer, John & Leslie et al. in 2015 showed that women had more dental restorations, though men had more current decay (Shaffer et al., 2015). However, Our study indings were in concordance with major studies. Reason for Male predilection is due to the increased cariogenic diet and poor oral hygiene that increases caries incidence.
The strength of the study is this study being performed with available data and population of variant economic stature. Limitations of this study include Geographic limitations, Unequal sample size and Unicentered study. Future prospects of this study includes overcoming the limitations Knowledge of prevalence of class I caries is essential for parents to take up better oral hygiene measures. Primary mandibular second molar is an important tooth in the primary dentition that maintains arch length. The key motive of this study is to emphasise Knowledge on restorative therapy, thereby leading to lesser dental mortality.

CONCLUSION
Within the limitations of the current study, glass ionomer restorations were higher in primary mandibular second molars when compared to composite restorations. On gender comparison, females received higher composite restorations when compared to males who received glass ionomer cement restorations.