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KMID : 0358920160430020176
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Journal of the Korean Academy of Pedodontics
2016 Volume.43 No. 2 p.176 ~ p.186
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Three Dimensional Analysis of Primary Maxillary Central and Lateral Anterior Zirconia Crown
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Lee Jung-Min
Lee Hyo-Seol
Nam Ok-Hyung
Kim Mi-Sun
Choi Sung-Chul
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Abstract
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This study was performed to compare the shape and dimension of anterior zirconia crowns to other pediatric crowns using a three-dimensional scanner to investigate adequate amount of tooth preparation. Primary central and lateral anterior zirconia crowns, stainless steel crowns and celluloid strip crowns were scanned by a three-dimensional scanner. Outer and inner surfaces of zirconia and stainless steel crowns, and outer surface of celluloid strip crowns were analyzed.
In outer scanned images, all sizes of central and lateral size 1 zirconia crown had the largest labiolingual diameter among the three crowns. In inner scanned images, zirconia crown’s mesiodistal diameter was 0.7-1.0 mm smaller and crown length was approximately 1 mm shorter than those of stainless steel crowns. Zirconia crown’s labiolingual diameter was larger in central crowns whereas it was smaller in lateral crowns than that of stainless steel crowns. Recommended preparation required for zirconia crown is incisal 2.5-3.0 mm, mesiodistal 1.5-2.0 mm, labial 0.5-1.0 mm. Cingulum should be trimmed parallel to the long axis. No more lingual reduction is needed in central incisors whereas additional 0.5 mm reduction is suggested in lateral incisors.
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KEYWORD
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Zirconia crown, Primary incisors, Tooth preparation, Three dimension
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