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The effect of variation of the lingual shape of mandibular complete dentures on lingual resistance to lifting forces

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The effect of variation of the lingual shape of mandibular complete dentures on lingual resistance to lifting forces

Auteurs : William P. Miller [Royaume-Uni, Nouvelle-Zélande] ; Brian Monteith [Royaume-Uni] ; M. Robin Heath [Royaume-Uni]

Source :

Gerodontology [ 0734-0664 ] ; 1998-12.

RBID : ISTEX:AD91149C96F80CA085A30FBED862CD46EF368EE0

English descriptors

Abstract

Increasing life expectancy, age related reduction in adaptability and progressive severe mandibular resorption all add to the importance of any factor improving the prosthetic success. Objective: To investigate the effect of two different lingual shapes of lower dentures on patients' ability to resist lifting forces. Design: Tongue pressures on the lingual surface of complete mandibular experimental dentures were recorded from mid‐line, premolar and molar transducers. Two experimental prostheses were fabricated for each subject: one conventionally contoured, the other formed by piezography. Setting: A clinical research laboratory. Subjects Five experienced complete denture wearers between age 64 and 82 years. Intervention Lifting forces were applied at the midline, left and right premolar sites in random order. Main outcome measures: Peak resistance to lifting forces and lingual pressures used during these tests. Results: Lingual pressures exerted anteriorly were dramatically higher than those on premolar and molar surfaces. Significantly higher pressures were used to resist lifting forces applied to piezographically than conventionally formed contours; correspondingly, significantly higher lifting peak forces were, on average, resisted. Conclusions: Providing a lower denture with a piezographically produced lingual surface was shown, in this preliminary study, to enhance tongue retentive ability over a conventional design. It seems reasonable to maximise retentive potential with oblique sublingual polished surfaces and minimise the adaptive demand, particularly for older patients, by using a piezographic technique which “customises” the contour and precludes over‐extension.

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DOI: 10.1111/j.1741-2358.1998.00113.x

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<front><div type="abstract">Increasing life expectancy, age related reduction in adaptability and progressive severe mandibular resorption all add to the importance of any factor improving the prosthetic success. Objective: To investigate the effect of two different lingual shapes of lower dentures on patients' ability to resist lifting forces. Design: Tongue pressures on the lingual surface of complete mandibular experimental dentures were recorded from mid‐line, premolar and molar transducers. Two experimental prostheses were fabricated for each subject: one conventionally contoured, the other formed by piezography. Setting: A clinical research laboratory. Subjects Five experienced complete denture wearers between age 64 and 82 years. Intervention Lifting forces were applied at the midline, left and right premolar sites in random order. Main outcome measures: Peak resistance to lifting forces and lingual pressures used during these tests. Results: Lingual pressures exerted anteriorly were dramatically higher than those on premolar and molar surfaces. Significantly higher pressures were used to resist lifting forces applied to piezographically than conventionally formed contours; correspondingly, significantly higher lifting peak forces were, on average, resisted. Conclusions: Providing a lower denture with a piezographically produced lingual surface was shown, in this preliminary study, to enhance tongue retentive ability over a conventional design. It seems reasonable to maximise retentive potential with oblique sublingual polished surfaces and minimise the adaptive demand, particularly for older patients, by using a piezographic technique which “customises” the contour and precludes over‐extension.</div>
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The effect of variation of the lingual shape of mandibular complete dentures on lingual resistance to lifting forces

The effect of variation of the lingual shape of mandibular complete dentures on lingual resistance to lifting forces

Source :

English descriptors

Abstract

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