Influence of the buccolingual morphology of the crown on the buccolingual pressure of the abutment for the mandibular first molar
LIN Ping-ting
WANG Hui
LI Xiao
GAO Jing
CHEN Ji-hua
Abstract：AIM: To compare the buccolingual pressures between natural mandibular first molar and its homonym crown. METHODS:15 participants with facial symmetry who needed crown restoration of the mandibular first molar were enrolled in this study. Buccal and lingual pressure of the natural teeth and the homonym crowns was measured using pressure sensor on the try-in visit. The neutral zone position of the mandibular first molars was also recorded for further comparison with the corresponding position of the restoration. VAS form was graded by the partici-pants for the foreign body sensation on axial contour of the restoration 1 week after crown cementation. RESULTS:The buccal and lingural pressure of the natural teeth was (2.50 ±1.36)g/cm2 and(3.33 ±1.83)g/cm2, that of the homo-nym crown was (2.22 ±2.03)g/cm2 and(4.40 ±3.77)g/cm2, respectively. The lingual/buccal pressure ratio of the crown was significantly higher than that of the natural tooth (2. 17 ± 0. 52 vs. 1. 38 ± 0. 29, P<0. 05). Positive corre-lation was observed between buccolingual pressures and the buccolingual displacement of the neutral zone of the restora-tion. 46. 67% of the participants graded foreign body sensation at both sides. CONCLUSION:The modality induced buccolingual force balance of the crown restoration is the main factor of the comfort level.
Keywords：mandibular first molarcrownsaxial contourpressure
Publication Date：2016-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 721-724,715 )