J Adv Prosthodont.  2016 Apr;8(2):116-124. 10.4047/jap.2016.8.2.116.

Strains around distally inclined implants retaining mandibular overdentures with Locator attachments: an in vitro study

• Elsyad MA
• Setta FA
• Khirallah

• KMID: 2176649
• DOI: http://doi.org/10.4047/jap.2016.8.2.116

Abstract

PURPOSE
The aim of the present study was to evaluate, by means of strain gauge analysis, the effect of different implant angulations on strains around two implants retaining mandibular overdenture with Locator attachments.
MATERIALS AND METHODS
Four duplicate mandibular acrylic models were constructed. Two implants were inserted in the canine regions using the following degrees of distal inclinations: group I (control); 0°, group II; 10°, group III; 20°, and group IV; 30°. Locator pink attachments were used to connect the overdenture to the implants and Locator red (designed for severely angled implants) was used for group IV (group IV(red)). For each group, two linear strain gauges were attached at the mesial and distal surfaces of the acrylic resin around each implant. Peri-implant strain was measured on loading and non-loading sides during bilateral and unilateral loading.
RESULTS
For all groups, the mesial surfaces of the implants at loading and non-loading sides experienced compressive (negative) strains, while the distal implant surfaces showed tensile (positive) strains. Group IV showed the highest strain, followed by group III, group II. Both group I and group IV(red) showed the lowest strain. The strain gauges at the mesial surface of the loading side recorded the highest strain, and the distal surface at non-loading side showed the lowest strain. Unilateral loading recorded significantly higher strain than bilateral loading.
CONCLUSION
Peri-implant strains around two implants used to retain mandibular overdentures with Locator attachments increase as distal implant inclination increases, except when red nylon inserts were used.

Keyword

Strain; Inclined implants; Locator; Overdentures

MeSH Terms

Denture, Overlay*
Nylons
Nylons

Figure

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  Fig. 1 Controlling the degree of distal implant inclination using a conventional transparent plastic semicircular protractor.

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  Fig. 2 (A) Group I (0°) implant inclination, (B) Group II (10°) implant inclination, (C) Group III (20°) implant inclination, (D) Group IV (30°) implant inclination.

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  Fig. 3 The strain gauge positions around the implants.

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  Fig. 4 Bilateral load application.

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  Fig. 5 Unilateral load application.

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