Impact of simulated reduced alveolar bone support, increased tooth mobility, and distal post-supported, root-treated abutment tooth on load capability of all-ceramic zirconia-supported cantilever FDP.

Abstract

OBJECTIVES:

The aim of this in vitro study was an analysis of the impact of simulated reduced alveolar bone support and post-restored, endodontically treated distal abutment tooth on load capability of all-ceramic zirconia-based cantilever-fixed dental prosthesis (CFDP).

MATERIAL AND METHODS:

The roots of human lower sound premolars (n = 80) were divided into five experimental groups to be restored with all-ceramic zirconia-supported three-unit CFDP regarding bone loss (BL) relative to the cement-enamel junction (CEJ): 2 mm below CEJ = 0% BL (control group), group 25% distal BL, group 50% distal BL, group 50% mesial and distal BL, and group 50% distal BL and adhesive post-supported restoration. Specimens were exposed to simulated clinical function by thermo-mechanical loading (6.000 cycles 5°-55°; 1.2 × 106 cycles 0-50 N) and subsequent linear loading until failure.

RESULTS:

Tooth mobility increased significantly for groups with simulated bone loss (p < 0.001). Four specimens failed during thermal cycling and mechanical loading (TCML). The maximum load capability ranged from 350 to 569 N, and did not differ significantly between experimental groups (p = 0.095). Groups with simulated bone loss revealed more tooth fractures at distal abutment teeth, whereas technical failures were more frequent in the control group (p = 0.024).

CONCLUSIONS:

Differences of alveolar bone support and respectively increased tooth mobility between mesial and distal abutments did not influence load capability. A distal adhesively post-and-core-supported, root-treated abutment tooth did not increase risk of three-unit CFDP failure.

CLINICAL RELEVANCE:

CFDPs are a treatment option used with caution when reduced alveolar bone support, increased tooth mobility, and distal post-supported, root-treated abutment teeth are involved.

• Authors: M Naumann, M von Stein-Lausnitz, M Rosentritt, C Walter, H Meyer-Lückel, G Sterzenbach
• Journal: Clinical oral investigations (Clin Oral Investig) Vol. 22 Issue 8 Pg. 2799-2807 (Nov 2018) ISSN: 1436-3771 [Electronic] Germany
• PMID: 29404813 (Publication Type: Journal Article)

Topics

• Alveolar Bone Loss
• Bicuspid (surgery)
• Ceramics
• Dental Abutments
• Dental Restoration Failure
• Dental Stress Analysis
• Denture, Partial, Fixed
• Humans
• In Vitro Techniques
• Post and Core Technique
• Tooth Mobility
• Tooth, Nonvital