Replacement of a Mandibular Subperiosteal Implant

F. Mansueto

Full text link: https://pubmed.ncbi.nlm.nih.gov/10551150/

Replacement of a Mandibular Subperiosteal Implant

1. Scientific Reference

• Study title: Replacement of a mandibular subperiosteal implant
• Author: R. F. Mansueto
• Scientific journal: Not specified in the information provided.
• Year of publication: 1999
• PMID: 10551150
• DOI: 10.1563/1548-1336(1999)025<0199>2.3.CO;2

2. Scientific Context

This publication addresses a specific challenge in implant rehabilitation: the management of a failed mandibular subperiosteal implant. The report concerns a 60-year-old woman for whom two substantially different treatment pathways were considered following implant failure.

One option involved bone augmentation using an autogenous iliac crest graft, followed by subsequent placement of endosseous implants. The alternative was to replace the failed subperiosteal implant with a new device incorporating a more sophisticated tripodal design.

The clinical interest of this case lies primarily in the therapeutic decision-making process rather than in a comparative assessment of implant techniques. In addition to surgical considerations, economic factors and quality-of-life issues contributed to treatment selection. Based on the information available, however, the report cannot establish the relative effectiveness of these different rehabilitation strategies or define broader indications for their use.

3. Study Objective

The purpose of this publication was to report the clinical management of a failed mandibular subperiosteal implant in a 60-year-old woman.

The case focuses on the choice between two possible approaches: autogenous iliac crest augmentation followed by endosseous implant placement, or replacement of the failed implant with another subperiosteal implant featuring a tripodal design. The publication should therefore be regarded as a description of an individual clinical management strategy rather than as a comparative evaluation of these treatment options.

4. Methodology

This publication is a clinical case report involving a single 60-year-old female patient with a failed mandibular subperiosteal implant.

Two treatment alternatives were considered. The first consisted of bone augmentation with an autogenous iliac crest graft, followed by the subsequent placement of endosseous implants. The second involved replacement of the failed subperiosteal implant with a more sophisticated tripodal design.

The latter approach was selected, with economic considerations and quality-of-life issues contributing to the decision.

The available abstract does not provide the duration of follow-up, detailed surgical procedures, specific criteria used to characterize the initial implant failure, postoperative assessment criteria, or quantitative outcome measures. These methodological aspects therefore cannot be evaluated from the information provided.

5. Main Results

The principal clinical event reported in the publication was the replacement of the failed mandibular subperiosteal implant with another subperiosteal implant incorporating a tripodal design.

This strategy was selected after consideration of an alternative reconstructive pathway involving autogenous iliac crest bone augmentation followed by endosseous implant placement. In this particular case, replacement of the subperiosteal implant was considered the more conservative option, with both economic and quality-of-life factors influencing treatment selection.

The available abstract does not report implant survival data, follow-up duration, quantitative clinical outcomes, biological or mechanical complications, or detailed prosthetic results. Consequently, the information provided does not allow an assessment of the long-term performance of the replacement implant.

Likewise, no direct comparison between the two proposed treatment strategies was performed, and no conclusion regarding their relative effectiveness can be drawn from this case report.

6. Clinical Analysis

The main clinical value of this case lies in the decision-making process following failure of a mandibular subperiosteal implant. Rather than presenting a single predetermined solution, the report describes consideration of two treatment pathways with different surgical implications.

One strategy would have required autogenous bone augmentation using an iliac crest graft before subsequent placement of endosseous implants. The alternative retained the subperiosteal concept but replaced the failed device with an implant of a different, tripodal design. In the reported patient, the latter option was selected partly because of economic and quality-of-life considerations.

This aspect is clinically relevant because it illustrates how treatment planning in complex implant rehabilitation may involve factors extending beyond the technical feasibility of a surgical procedure. Within this individual case, patient-related considerations influenced the final therapeutic choice.

The findings must nevertheless be interpreted conservatively. A single case cannot determine whether replacement with a tripodal subperiosteal implant provides predictable outcomes in other patients. Nor does it establish equivalence or superiority compared with bone augmentation followed by endosseous implant therapy.

Furthermore, the absence of detailed follow-up and outcome data in the available abstract prevents any meaningful assessment of long-term implant stability, complications, or prosthetic performance. The publication therefore documents a specific clinical approach rather than validating a broadly applicable treatment protocol.

7. Clinical Applications

The report may be relevant to clinicians considering treatment options after failure of a mandibular subperiosteal implant, particularly when different reconstructive pathways are being evaluated.

In the reported case, replacement of the failed implant with a tripodal subperiosteal design was considered as an alternative to autogenous bone reconstruction followed by endosseous implant placement. The case also highlights the potential role of economic considerations and quality-of-life factors in individualized treatment planning.

However, the information provided does not establish patient-selection criteria, standardized surgical indications, or a reproducible protocol for subperiosteal implant replacement. The findings should therefore not be interpreted as supporting routine use of this strategy in other clinical situations.

8. Level of Evidence, Limitations, and Transparency

The study provides a low level of evidence because it is based on a single clinical case. A case report can document an unusual or clinically relevant management strategy, but it cannot provide robust comparative evidence or establish treatment predictability across a broader patient population.

An inherent limitation is the absence of a control or comparison group. In addition, the available abstract does not specify follow-up duration, quantitative outcome measures, complications, or detailed criteria for assessing the replacement implant.

Further methodological limitations are not detailed in the information provided.

Conflicts of interest or relationships with implant manufacturers: no information is provided. Therefore, the presence or absence of potential conflicts of interest cannot be determined from the available material.

9. Key Study Points

• Study type: Clinical case report.
• Level of evidence: Low.
• Population or number of studies analyzed: One 60-year-old female patient.
• Number of patients or implants: 1 patient; total number of implants not specified in the information provided.
• Follow-up duration: Not specified in the information provided.
• Primary outcome assessed: Not formally defined in the available abstract; the report describes replacement of a failed mandibular subperiosteal implant.
• Main result: The failed implant was replaced with a subperiosteal implant incorporating a tripodal design.
• Scientific conclusion: The case documents the use of this approach in a patient for whom autogenous iliac crest augmentation followed by endosseous implant placement had also been considered.
• Main limitations: Single-patient case report and lack of detailed follow-up and quantitative outcome data in the available abstract.

10. Scientific Impact

The contribution of this publication is primarily descriptive. It documents a clinical situation in which failure of a mandibular subperiosteal implant was managed by replacing the device rather than proceeding with an alternative reconstructive strategy involving autogenous bone augmentation and subsequent endosseous implant placement.

The report is also noteworthy for the decision-making considerations described. The selected treatment was influenced not only by the proposed surgical pathway but also by economic and quality-of-life factors. This provides an individualized perspective on treatment selection in complex implant rehabilitation.

Its scientific impact must nevertheless be considered within the limitations of a case report. The available evidence does not demonstrate that a tripodal subperiosteal replacement implant is superior, equivalent, or inferior to the alternative reconstructive approach. Rather, the publication contributes an individual clinical experience that may help frame further discussion and investigation of treatment strategies following subperiosteal implant failure.

11. Editorial Conclusion

This case report documents the replacement of a failed mandibular subperiosteal implant in a 60-year-old woman as an alternative to autogenous iliac crest augmentation followed by endosseous implant placement. Its main interest lies in the individualized treatment decision, which incorporated economic and quality-of-life considerations. Given the single-patient design and the absence of detailed follow-up and quantitative outcome data in the available abstract, the report should be interpreted as a clinical experience rather than evidence supporting a general treatment recommendation.