Abstract
Background and aims. Due to anatomic variation in tooth anatomy between populations, this study compared the buccolingual (BL) and mesiodistal (MD) dimensions of primary molars with those of stainless steel crowns (SSCs) in anIranian population.Materials and methods. Impressions were taken from both dental arches of children, and casts were poured. Teeth with caries, restoration, hypoplasia or other dental anomalies were excluded. 216 primary molars were selected and divided into 4 groups of 54 each (maxillary and mandibular first and second primary molars). MD/BL dimensions were measured using a digital caliper with 0.01 mm precision on casts and SCCs (3M brand). Data were assessed using paired t-test, post hoc test and ANOVA. P < 0.05 was considered statistically significant.Results. The MD dimension of the lower first molar SSC and the BL dimension of the lower second molar SSC had the least difference with the corresponding values of the respective teeth. The MD dimension of the upper second molar SSC and the BL dimension of the upper first molar SSC had the greatest difference with the corresponding values in the respective teeth. Comparison of the two different brands of SSCs for the upper first molar revealed that both types had significant differences with the teeth in terms of both MD (P = 0.0) and BL (P = 0.0) dimensions.Conclusion. In the studied population, best adaptation was seen in second lower molars and the least adaptationswere seen in first and second upper molars.
Highlights
Primary teeth play an important role in growth and development of children
The MD dimension of the lower first molar stainless steel crowns (SSCs) and the BL dimension of the lower second molar SSC had the least difference with the corresponding values of the respective teeth
The MD dimension of the upper second molar SSC and the BL dimension of the upper first molar SSC had the greatest difference with the corresponding values in the respective teeth
Summary
Primary teeth play an important role in growth and development of children. Attempts to maintain the primary teeth until the eruption of theirJODDD, Vol 9, No 2 Spring 2015 permanent successors have resulted in the introduction of many restorative materials and techniques.[1,2] Use of stainless steel crowns (SSCs) is one of these techniques. Variations in SSCs and preparation designs were aimed to help with the selection process.[4] The tooth size discrepancy in different populations and ethnic groups is an important issue in this respect that needs to be taken into account Such differences in some cases are significant.[5,6,7] For instance, evidence shows that black Americans have larger teeth than white Americans.[8] men have larger teeth than women.[9,10] In a research in Iceland on buccolingual and mesiodistal dimensions of primary molar, results showed that they have the largest crown dimensions among European children.[11] A research in Taiwan was performed to design a suitable SSC.
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