Abstract
This study aimed to conduct a stress analysis of four types of cervical finish lines in posterior all-ceramic crowns on the primary roots of molar teeth. Four different types of finish lines (shoulder 0.5 mm, feather-edged, chamfer 0.6 mm, and mini chamfer 0.4 mm) and two all-ceramic crown materials (zirconia and lithium disilicate) were used to construct eight finite element primary tooth models with full-coverage crowns. A load of 200 N was applied at two different loading angles (0° and 15°) so as to mimic children’s masticatory force and occlusal tendency. The maximum stress distribution from the three-dimensional finite element models was determined, and the main effect of each factor (loading type, material, and finish line types) was evaluated in terms of the stress values for all of the models. The results indicated that the loading type (90.25%) was the main factor influencing the maximum stress value of the primary root, and that the feather-edged margin showed the highest stress value (p = 0.002). In conclusion, shoulder and chamfer types of finish lines with a 0.4–0.6 mm thickness are recommended for deciduous tooth preparation, according to the biomechanical analysis.
Highlights
IntroductionDental caries in young children may affect their body weight, growth, and quality of life [1]
Dental caries in young children may affect their body weight, growth, and quality of life [1].If the caries remain untreated, they can rapidly progress into cavitation, involve dental pulp, and lead to dental infection or dangerous fascial space involvement
Comparisons of different types of finish lines showed that the feather-edged type had the highest
Summary
Dental caries in young children may affect their body weight, growth, and quality of life [1]. If the caries remain untreated, they can rapidly progress into cavitation, involve dental pulp, and lead to dental infection or dangerous fascial space involvement. Teeth with large carious lesions or those subjected to pulpotomy/pulpectomy require full-coverage prostheses such as stainless steel crowns (SSCs) [4]. Preformed metal crowns for deciduous molar teeth have been available since the 1950s [7,8]. SSCs are metal caps that are used by dentists to cover decayed primary teeth and to prevent further decay. Traditional SSCs allow dentists to trim, crimp, and shape in order to better adapt to the cervical portion of the primary teeth. Santamaría et al [9], in their questionnaire-based study in Germany, reported that dentists generally find SSCs to be technically complex, esthetically displeasing
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