J Adv Prosthodont.  2016 Dec;8(6):472-478. 10.4047/jap.2016.8.6.472.

Contour of lingual surface in lower complete denture formed by polished surface impression

• Heo YR
• Kim HJ
• Son MK
• Chung CH

• KMID: 2382593
• DOI: http://doi.org/10.4047/jap.2016.8.6.472

Abstract

PURPOSE
The aim of this study was to analyze the shapes of lingual polished surfaces in lower complete dentures formed by polished surface impressions and to provide reference data for use when manufacturing edentulous trays and lower complete dentures.
MATERIALS AND METHODS
Twenty-six patients with mandibular edentulism were studied. After lower wax dentures were fabricated, wax was removed from the lingual side of the wax denture and a lingual polished surface impression was obtained with tissue conditioner. The definitive denture was scanned with a three-dimensional scanner, and scanned images were obtained. At the cross-sections of the lingual frenum, lateral incisors, first premolars, first molars, and anterior border of the retromolar pads, three points were marked and eight measurements were taken. The Kruskal-Wallis test and a post hoc analysis with the Mann-Whitney test were performed.
RESULTS
Each patient showed similar values for the same areas on the left and right sides without a statistically significant difference. The height of the contour of the lingual polished surface at the lingual frenum was halfway between the occlusal plane and lingual border, it moved gradually in a downward direction. The angle from the occlusal plane to the height of the contour of the lingual polished surface was increased as it progressed from the lingual frenum towards the retromolar pads.
CONCLUSION
The shape of the mandibular lingual polished surface was convex at the lingual frenum, lateral incisors and gradually flattened towards the first molars and retromolar pads.

Keyword

Contour; Lower complete denture; Lower polished surface; Polished surface impression; Shape

MeSH Terms

Bicuspid
Dental Occlusion
Denture, Complete*
Dentures
Humans
Incisor
Lingual Frenum
Molar

Figure

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  Fig. 1 (A) Lower wax denture formed by polished surface impression using a tissue conditioner, (B) Definitive lower compete denture.

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  Fig. 2 (A) Scanning of the definitive denture, (B) Scanned images of definitive denture.

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  Fig. 3 Cross sections of each region. (A) lingual frenum, (B) lateral incisor, (C) first premolar, (D) first molar, (E) anterior border of retromolar pad.

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  Fig. 4 Reference points and measurements at the sectioned lingual polished surface. (a) the lingual margin of the artificial teeth, (b) the height of the contour at the lingual polished surface, (c) the most inferior lingual border, (A) the perpendicular distance between the a-c line and b, (B) the vertical distance from the occlusal plane to b, (C) the vertical distance between b and c, (D) the vertical distance from the occlusal plane to c, (E) the ratio of C to D, (F) the angle formed by the a-b line and the occlusal plane, (G) the angle formed by the b-c line and the occlusal plane, (H) the angle formed by the a-b line and the b-c line.

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  Fig. 5 Contour and mean values of each region. (A) lingual frenum, (B) lateral incisor, (C) first premolar, (D) first molar, (E) anterior border of retromolar pad.

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