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Summary of Specific Diurnal EMG Activity Pattern Observed in Occlusal Collapse Patients:

Relationship between Diurnal Bruxism and Tooth Loss Progression


PMC4092086 (Ref ID)

Chosen Image filename: PMC4092086_Figure_01.jpg

Document structure and format:

I. Introduction

The research paper titled "Specific Diurnal EMG Activity Pattern Observed in Occlusal Collapse Patients: Relationship between Diurnal Bruxism and Tooth Loss Progression" aims to investigate the role of parafunctional masticatory muscle activity in tooth loss progression. The significance of this study lies in the need to establish a causal relationship between mandibular parafunction and stomatognathic system breakdown.

II. Methodology

The study utilized a research design that included three subject groups: the progressive bite collapse group (PBC group), the matched control group (MC group), and the young control group (YC group). Data on electromyograms (EMG) of the masseter muscles were collected continuously using an ambulatory EMG recorder while the patients were awake and asleep. Diurnal and nocturnal parafunctional EMG activity was classified as phasic, tonic, or mixed based on an EMG threshold of 20% maximal voluntary clenching.

III. Results

The key findings of the study indicate that highly extended diurnal phasic activity was observed only in the PBC group, suggesting a link between extensive bite loss and diurnal masticatory muscle parafunction. The three groups exhibited significantly different mean diurnal phasic episodes per hour, with the PBC group showing the highest frequency. The number of diurnal phasic episodes could potentially be used to predict bite collapsing tooth loss.

IV. Discussion

The results of the study challenge the stereotypical idea of nocturnal bruxism as the main cause of tooth loss. The findings highlight the importance of diurnal phasic masticatory muscle activity in patients with progressive bite collapse. The study suggests that the incidence of diurnal phasic contractions could be used for prognostic evaluations of stomatognathic system stability.

However, it is essential to acknowledge certain limitations of the study. The sample size was relatively small, with only six subjects in each group. Additionally, the research relied on subjective self-reported questionnaires, which could introduce biases in the data.

V. Conclusion

In conclusion, this research paper provides valuable insights into the specific diurnal EMG activity pattern observed in occlusal collapse patients. It highlights the role of diurnal masticatory muscle parafunction in tooth loss progression and challenges the widely accepted notion of nocturnal bruxism as the primary cause. The findings contribute to the understanding of stomatognathic system breakdown and suggest the potential use of diurnal phasic episodes for prognostic evaluations. Further research with larger sample sizes and more objective measurements is needed to validate and expand upon these findings.

Figure 1 - Typical panorama x-ray view of Eichner Index B4 patient.
Courtesy of PMC4092086


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