Single Implant-retained Overdentures Research Articles

Analysis of Marginal Bone Loss and Residual Ridge Resorption in Conventionally Loaded Single and Two Implant Supported Overdentures

Purpose: The aim of this study was to analyze the marginal bone loss and residual ridge resorption in patients wearing single and two implant-supported overdentures. Materials and methods: This study was conducted on 20 edentulous patients between 50-75 years of age who have been completely edentulous for a period of at least one year or more. Patients were divided into two groups: Group-A in which two implants of size 3.75x13mm were placed in B and D position and ball abutments were attached to make an overdenture; in Group-B patients, a single implant at position C was placed and overdenture was made with ball abutments. Crestal bone loss was recorded around the margins in both the groups and residual ridge resorption was calculated in the mandibular posterior region using Wical And Swoope method. The data collected were compared for analysis using the Man-Whitney U test. Results: For 2-IOD overall mean crestal bone loss for one year was 0.15± 0.03cmand for S-IOD it was 0.14 ± 0.03cm. The significance value was calculated to be 0.518 and U=41.5 which was found to be non-significant. Difference in residual ridge resorption was also found to be non-significant in both the groups with the significance value of 0.284 and U=36. Conclusion: The scope of the single implant-retained overdentures can be a promising alternative for patients with an atrophic mandible, systemically compromised patients with financial difficulties.

Radiographic Evaluation of Single Implant Retained Overdenture Using Locator Versus Ball and Socket Attachments

Aim: The aim of this study was to radiographically evaluate ball versus locator attachment systems for mandibular single implant-retained complete over denture. Subjects and Methods: Twenty completely edentulous patients were randomly selected from the Outpatient Clinic, Department of Removable Prosthodontics, Faculty of Dental Medicine, (Boys, Cairo), Al-Azhar University. The patients divided into groups, group I received single implant retained overdenture with ball and socket while group II received single implant retained overdenture with locator attachment. Radiographic evaluation was carried out with periapical radiograph using the extension cone parallel technique. Results: Group I recorded higher bone loss than group after one year of overdenture insertion and the difference was significant. Conclusion: Locator attachment provides optimal results regarding preservation of bone around implant fixture of implant retained overdenture than those with ball and socket attachment.

Single Implant Retained Overdenture Treatment Protocol: A Systematic Review and Meta‐Analysis

This systematic review was undertaken to establish the most favourable protocol to treat an edentulous mandible with a single implant-retained overdenture. The formulated PICO question was: "Which surgical and prosthetic protocols result in the highest survival and complication rates of implants and prostheses employed in a single implant retained overdenture for the rehabilitation of a completely edentulous mandibular ridge?" A structured literature search was conducted using the following databases; PubMed, ScienceDirect, COCHRANE, LILACS, IndeMED, OVID, EMBASE, NIH Clinical Trials for reports related to the single implant-retained overdenture treatment. Only English articles were included. Publications with a minimum follow up time of one year and above were included for meta-analysis. A Poisson regression model was applied to estimate the survival rates of the implant and prosthesis employed. The electronic database search yielded 2083 titles and abstracts; and a total of 17 were selected for the systematic review, of which 11 studies were subjected to meta-analysis. The implants showed high estimated five and 10-year survival rates of 91.93% and 84.62% respectively. Implants that were delayed loaded showed the greatest survival rates, while immediately loaded implants presented with higher survival rates at five (p = 0.849) and 10 years (p = 0.464) when compared to early loaded implants. The greatest number of fractures were associated with ball abutments with an event rate of 10.8 (95% CI: 10.5-11.09) per 100 prosthesis years, while locator abutments showed a greater number of maintenance events with an event rate of 16.84(95%CI:16.01-17.66) per 100 prosthesis years. Single implant-retained overdenture treatment is a cost-effective, minimally invasive and simple treatment that can be used to restore function and aesthetics to edentulous patients, with relatively high implant and prosthesis success rates and minimal complications. This article is protected by copyright. All rights reserved.

Reinforcement of Single Implant-Retained Mandibular Overdenture with a Cobalt-Chromium Framework before Implant Surgery.

Previous clinical research has shown promising results in oral rehabilitation of elderly adults by a single implant-retained mandibular overdenture; however, the high incidence of fracture in the anterior region of these overdentures is a concern for clinicians. To minimize catastrophic overdenture fracture, we propose a technique to insert an individualized metal framework in single implant-retained overdentures prior to implant surgery.

Single implant supported mandibular overdenture: A literature review.

Purpose:Rehabilitation of the edentulous mandible by implant-supported prosthesis is a successful and satisfying treatment as suggested by many clinical trials. However, the minimum number of implants required for this restoration is debatable. Single implant retained overdenture (SIROD) has gained popularity as a simple protocol. The purpose of this review is to systematically analyze the literature on SIROD.Materials and Methods:An electronic search was done in the PubMed and Medline databases using the key words “central single implant overdenture,” “implant overdenture retained by one implant,” “implant overdenture retained by single implant,” “mandibular single implant overdenture,” “mandibular SIRODs.” Articles from 1993 to November 2012 were included in the review. Out of 208 articles, only 18 had relevant data pertaining to mandibular single implant overdenture. Two more were hand-picked from journals that are non-PubMed indexed but from reputed publishing houses.Results:Majority of studies supported the concept of SIROD. Success outcome was addressed in relation to surgical, prosthetic, functional parameters, and patient satisfaction. 65% studies evaluated the primary stabilities of the placed implants, 50% of studies assessed the marginal bone loss quarterly across a 1-year period. Prosthesis outcome was a criterion for evaluation of success rate in 45% of studies.Conclusion:The SIROD is proved to be successful and an economic treatment protocol. However, the clinical parameters such as masticatory efficiency bite force, retention, and stability needs to be investigated.

In vitro assessment of mandibular single/two implant-retained overdentures using stress-breaking attachments.

This study investigated the strain surround implants and the pressure distribution of the alveolar ridge related to implant overdentures with stress-breaking ball (SBB) attachments. Simulation models of edentulous mandibles were embedded with 1 and 2 implants to simulate a single implant-retained overdenture (S-IOD) and a two-implant-retained overdenture (T-IOD), respectively. The implants were connected to the denture base with the following conditions: complete separation between the denture base and implant with cover screws as a conventional complete denture (CD), 3 types of settlements with an SBB attachment between them, and a conventional ball attachment (BALL). Strain surround the implant, pressure at 5 different soft tissue areas, and displacement of the denture base were measured with loading up to 50 N. In S-IOD and T-IOD, the strain of each SBB attachment was less than the strain shown by the BALL. The pressure at each region of the SBB attachment was less than the pressure shown with the CD and BALL. SBB attachments prevented strain surround the implants in loading and provided optimal stress distribution.

Metal-reinforced single implant mandibular overdenture retained by an attachment: A clinical report

Results of studies have shown that a single implant mandibular overdenture significantly increases the satisfaction and quality of life of patients with edentulism. The single implant-retained overdenture has the additional advantage of being less expensive and invasive than a 2-implant supported overdenture but has a high incidence of fracture of the acrylic resin base at the point of the implant. The treatment, design, and fabrication of a metal-reinforced single-implant mandibular overdenture with the Locator attachment as a retention device is described.

Use of a single implant to retain a mandibular complete overdenture on the compromised atrophic alveolar ridge: a case report

This case report illustrates some of the advantages gained by placing a single implant in the midline of the intersym-physeal region of the mandible, which can be used to retain a complete mandibular overdenture in patients with a compromised atrophic mandible opposing a maxillary complete denture. This approach is a valid treatment option for patients with limited financial and therapeutic means. This case report, along with other evidence, demonstrates that a mandibular single implant-retained overdenture is a viable treatment option for a specific group of patients.

Biomechanical rationale for a single implant‐retained mandibular overdenture: an in vitro study

This study aimed to examine the biomechanical rationale of a single implant-retained overdenture (SIO) system using an in vitro model. Laboratory implant analogs (3.75 x 13 mm) were embedded into the midline and canine regions on both sides of the mandibular phantom model with artificial mucosa. Magnetic attachments (flat, FM; dome, DM) and a ball attachment (Ball) were mounted to the abutment where lateral forces were measured with four miniature strain gauges attached to the surface. A 50 N static load was applied at five different sites of the occlusal surface of the simulated denture base using each counterpart of the attachments. Strain data were compared between SIO and two implant-retained configurations (TIO) with three attachments. Three-dimensional (3D) denture base displacements were also measured. Statistical analysis was performed by multiple comparisons using a post hoc test (P<0.05). Statistically significantly smaller lateral forces to abutments were obtained in SIO than in TIO with the Ball with the molar load, while there were no statistical differences between SIO and TIO with FM. There were no statistical differences in 3D denture base movements between SIO and TIO in the midline and molar regions, while there were larger movements in SIO than in TIO with FM. Within the limitations of our in vitro study, we suggested that single-implant overdentures with dome-type magnet or ball attachments had biomechanical effects similar to two-implant overdentures in terms of lateral forces to the abutment and denture base movements under molar functional loads.