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Influence of abutment height and convergence angle on the retrievability of cement-retained implant prostheses with a lingual slot
Journal article   Open access   Peer reviewed

Influence of abutment height and convergence angle on the retrievability of cement-retained implant prostheses with a lingual slot

Kyu-Hyung Choi, KeunBaDa Son, Du-Hyeong Lee and Kyu-Bok Lee
The journal of advanced prosthodontics, Vol.10(5), pp.381-387
10/01/2018
DOI: 10.4047/jap.2018.10.5.381
PMCID: PMC6202427
PMID: 30370030
url
https://doi.org/10.4047/jap.2018.10.5.381View
Published (Version of record) Open Access

Abstract

PURPOSE. Cement-retained implant prostheses can lack proper retrievability during repair, and residual cement can cause peri-implantitis. The purpose of this in vitro study was to evaluate the influence of abutment height and convergence angle on the retrievability of cement-retained implant prostheses with lingual slots, known as retrievable cement-type slots (RCS). MATERIALS AND METHODS. We fabricated six types of titanium abutments (10 of each type) with two different heights (4 mm and 6 mm), three different convergence angles (8 degrees, 10 degrees, and 12 degrees), a sloped shoulder margin (0.6 mm depth), a rectangular shape (6 mm x 6.5 mm) with rounded edges, and a rectangular ledge (2 mm x 1 mm) for the RCS. One monolithic zirconia crown was fabricated for each abutment using a dental computer-aided design/computer-aided manufacturing system. The abutments and crowns were permanently cemented together with dual-curing resin cement, followed by 24 hours in demineralized water at room temperature. Using a custom-made device with a slot driver and torque gauge, we recorded the torque (N.cm) required to remove the crowns. Statistical analysis was conducted using multiple regression analysis and Mann-Whitney U tests (alpha=.05). RESULTS. Removal torques significantly decreased as convergence angles increased. Multiple regression analysis showed no significant interaction between the abutment height and the convergence angle (Durbin-Watson ratio: 2.186). CONCLUSION. Within the limitations of this in vitro study, we suggest that the retrievability of cement-retained implant prostheses with RCS can be maintained by adjusting the abutment height and convergence angle, even when they are permanently cemented together.
 Dentistry, Oral Surgery & Medicine Life Sciences & Biomedicine Science & Technology

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