Long-Term Retrospective Studies on Hydroxyapatite-Coated Endosteal and Subperiosteal Implants

T.S. Golec, J. T. Krauser

Full text link: https://pubmed.ncbi.nlm.nih.gov/1310661/

Long-Term Retrospective Studies on Hydroxyapatite-Coated Endosteal and Subperiosteal Implants

1. Scientific Reference

• Study title: Long-term retrospective studies on hydroxyapatite coated endosteal and subperiosteal implants
• Authors: T. S. Golec, J. T. Krauser
• Scientific journal: Not specified in the information provided.
• Year of publication: Not specified in the information provided.
• DOI: Not specified in the information provided.
• PMID: 1310661

2. Scientific Background

This publication addresses the long-term clinical performance of implants coated with hydroxyapatite, with particular attention to different implant designs rather than a single endosseous configuration. The devices considered include cylindrical implants, blade implants, and subperiosteal implants.

The scientific relevance of the study lies primarily in its clinical perspective extending beyond six years. Within the scope of the information available, the investigation focuses on whether hydroxyapatite coating may provide a clinical advantage when applied to different types of implant systems.

This makes the study relevant to the broader assessment of implant surface characteristics and their potential influence on long-term clinical outcomes. However, the available abstract provides only limited information regarding patient characteristics, treatment indications, implant distribution, or the parameters used to evaluate clinical performance. Its findings should therefore be interpreted within the boundaries of the retrospective evidence presented.

3. Objective of the Study

The primary objective was to retrospectively evaluate the clinical experience associated with hydroxyapatite-coated implants over a period covering more than six years of clinical use.

The investigation included several implant configurations, specifically cylindrical, blade, and subperiosteal implants. Based on the available abstract, the authors sought to determine whether hydroxyapatite coating was associated with a meaningful clinical advantage during the period under review. No additional or secondary objectives are specified in the information provided.

4. Methodology

The publication is described as a long-term retrospective study examining hydroxyapatite-coated implants over more than six years of clinical use.

The analysis was not restricted to one implant design. It included cylindrical implants as well as blade and subperiosteal implants, providing a broader perspective on the clinical use of hydroxyapatite-coated implant devices.

Important methodological details are not reported in the abstract provided. The number of patients, total number of implants, distribution among implant designs, patient selection criteria, follow-up protocol, and specific outcome measures are not specified. Similarly, the available information does not establish whether a formal control or comparison group was included.

These missing details limit the extent to which the methodology and comparative strength of the findings can be independently assessed.

5. Main Results

The central finding reported by the authors is a clinical advantage associated with hydroxyapatite coating over the period covered by their retrospective assessment.

An additional point of interest is that this observation was derived from clinical experience involving several implant configurations rather than cylindrical implants alone. Blade and subperiosteal implants were also considered in the study.

The magnitude of the reported advantage cannot, however, be quantified from the available abstract. No implant survival rates, success rates, failure rates, complication rates, or other numerical clinical outcomes are provided. Furthermore, the specific parameters used to characterize the reported clinical advantage are not described.

The evidence available therefore supports the conclusion that the authors observed favorable clinical performance associated with hydroxyapatite coating, but it does not allow the size of this potential benefit to be determined or compared quantitatively across the different implant designs.

6. Clinical Analysis

One of the most relevant features of this study is its clinical observation period extending beyond six years. The inclusion of cylindrical, blade, and subperiosteal implants also broadens the scope of the retrospective experience reported by the authors.

From an implant dentistry perspective, the findings suggest that implant surface characteristics—and specifically hydroxyapatite coating in this study—were considered clinically relevant to long-term implant performance. The authors’ overall assessment was favorable to coated implants during the period evaluated.

The clinical significance of this conclusion nevertheless requires careful interpretation. The available abstract does not specify what clinical endpoints were used to define the reported advantage. It is also unclear whether the different implant designs demonstrated comparable outcomes or whether the benefit varied among cylindrical, blade, and subperiosteal implants.

Furthermore, the absence of detailed quantitative outcomes prevents assessment of the magnitude or statistical significance of the observed effect. The retrospective nature of the study must also be considered when interpreting causality.

Accordingly, the publication provides supportive observational evidence regarding hydroxyapatite-coated implants, but the information available does not justify converting these observations into definitive treatment recommendations or assuming superiority across contemporary implant rehabilitation protocols.

7. Clinical Applications

The findings are primarily relevant to the long-term clinical assessment of hydroxyapatite-coated implants and to the broader consideration of implant surface characteristics in implant dentistry.

Because several implant configurations were examined, the study provides clinical observations relating to cylindrical endosteal implants, blade implants, and subperiosteal implants. Its principal practical relevance lies in documenting long-term experience with hydroxyapatite-coated implant devices.

The available evidence does not identify specific patient profiles, anatomical situations, or treatment indications in which hydroxyapatite coating should preferentially be selected. Likewise, no conclusions can be drawn from the supplied information regarding bone grafting, advanced bone reconstruction, or other implant rehabilitation strategies that were not explicitly addressed in the abstract.

8. Level of Evidence, Limitations, and Transparency

This publication is identified as a retrospective study and therefore provides observational clinical evidence. Such a design can contribute valuable long-term clinical information, but it does not provide the same level of evidence for causality as a prospective controlled or randomized clinical investigation.

Several important methodological variables are absent from the available abstract, including sample size, number of implants, patient characteristics, outcome definitions, and quantitative results. These omissions limit assessment of the robustness and generalizability of the findings.

Methodological limitations beyond those reasonably associated with the retrospective study design are not detailed in the information provided.

No conflicts of interest or relationships between the authors and implant manufacturers are reported in the supplied material. The absence of such information should not be interpreted as confirmation that no conflicts existed.

9. Key Study Points

• Study type: Long-term retrospective study.
• Level of evidence: Retrospective observational evidence; a specific evidence grade is not provided.
• Population or number of studies analyzed: Not specified in the information provided.
• Number of patients or implants: Not specified in the information provided.
• Follow-up period: More than six years of clinical use covered by the study.
• Implant designs evaluated: Cylindrical, blade, and subperiosteal implants with hydroxyapatite coating.
• Primary outcome measure: Not specifically defined in the information provided.
• Main result: The authors report a clinical advantage associated with hydroxyapatite coating during the period evaluated.
• Scientific conclusion: The retrospective clinical observations favor hydroxyapatite-coated implants within the context examined by the authors.
• Main limitations: Retrospective design and insufficient methodological and quantitative detail in the available abstract.

10. Scientific Impact

The scientific value of this publication lies primarily in its documentation of long-term clinical experience with hydroxyapatite-coated implants across different implant configurations. A clinical observation period exceeding six years provides a longer-term perspective on the use of this type of implant surface.

The study also extends beyond a single implant geometry by considering cylindrical, blade, and subperiosteal designs. In this context, it contributes observational evidence supporting the clinical interest of hydroxyapatite coating during the period investigated.

Its scientific impact must nevertheless be considered in light of the limited methodological information available in the abstract. Without detailed outcome measures, quantitative results, sample characteristics, or clearly defined comparative data, the publication cannot establish the magnitude of the reported advantage or demonstrate definitive superiority.

It is therefore best interpreted as supportive long-term retrospective evidence rather than conclusive proof favoring a particular implant surface strategy.

11. Editorial Conclusion

This retrospective study provides more than six years of clinical experience with hydroxyapatite-coated cylindrical, blade, and subperiosteal implants. The authors report a clinical advantage associated with the coating during the period evaluated, making the publication relevant to the historical assessment of implant surface characteristics and long-term implant performance. However, the absence of detailed quantitative and methodological data in the available abstract requires a cautious interpretation. The findings are supportive, but they should not be considered definitive evidence of generalized clinical superiority.