Masticatory muscle activity and oral health-related quality of life in patients wearing clear thermoplastic versus wrap-around retainers

Jirawiwatsaree, Rungtiwa; Supronsinchai, Weera; Changsiripun, Chidsanu

doi:10.1007/s00056-022-00402-w

Cited by 2 publications

(3 citation statements)

References 32 publications

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“…In comparison, another study with different bracket systems showed no significant difference in MM activity during clenching [ 22 ]. Also, a scientific publication shows an increase in MM activity using clear thermoplastic or wrap-around retainers after orthodontic treatment after 6 months of follow-up [ 23 ].…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, a study that involved orthodontic treatment with different bracket systems showed results of TA increasing during clenching [ 22 ]. In addition, TA tended to increase during MVC using clear thermoplastic or wrap-around retainers after orthodontic treatment after 6 months of follow-up [ 23 ].…”

Section: Discussionmentioning

confidence: 99%

“…In contrast, the subjects wearing the Bimler functional device constructed in accordance with the NM technique showed a statistically significant reduction in TA at rest after 6 months follow-up [ 25 ]. Also, the reduction of TA was seen when wearing clear thermoplastic or wrap-around retainers during the observational period of 6 months after orthodontic treatment [ 23 ].…”

Section: Discussionmentioning

confidence: 99%

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The effect of clear aligner treatment on masticatory muscles (masseter, temporalis) activity in adults: a systematic review and meta-analysis

Lekavičiūtė,

Paldauskaitė,

Stučinskaitė

et al. 2024

European Journal of Orthodontics

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Background The use of clear aligners is becoming more common for aesthetic orthodontic treatment, but there are still concerns about how they affect mastication biomechanics in the short and long term. The clear aligners treatment (CAT) mechanism changes the position of the mandible and maxilla, especially impacting the masseter muscle. Surface electromyography (sEMG) proves to be a useful method to evaluate masticatory muscle activity (MMA). Objectives To analyze the effect of clear aligners treatment on alterations in masticatory muscles (masseter, temporalis) using surface electromyography. Search methods Five databases (PubMed, Web of Science, SCOPUS, Cochrane Library, and Google Scholar) were searched up to March 2024. Selection criteria Studies in which MMA was evaluated after the installation of orthodontic clear aligners. Data collection and analysis Screening, data extraction, and quality assessments were performed by four investigators independently. The data, which evaluated temporalis and masseter muscle characteristics during CAT using surface electromyography, was extracted, and the quality of the studies was evaluated. The risk of bias was assessed using the Newcastle-Ottawa Scale (NOS). Results Six studies (two prospective cohort studies, three observational longitudinal studies, and one observational longitudinal case–control study) with low and moderate risk of bias were included in the qualitative synthesis. Six of these were also included in the meta-analysis. Our study investigated the dynamics of masseter and temporalis muscle activity during CAT. The results show that during maximal voluntary clenching, the masseter muscle demonstrated a significant initial increase (P < .05) followed by a subsequent non-significant decrease. It also showed that submaximal voluntary clenching consistently exhibited a significant reduction in muscle activity throughout the study period (P < .01). Assessment of muscle activity at the mandibular resting position revealed a variety of responses, with some participants showing a significant increase while others exhibited non-significant changes (P < .05, P > .05, respectively). However, the meta-analysis showed a non-significant difference in measuring masseter and temporalis muscles activity during CAT. Conclusions Based on existing evidence, it is reasonable to conclude that CAT affected MMA. During maximal voluntary clenching, masseter muscle activity initially increased but later decreased, while temporalis muscle activity showed mixed results. Submaximal voluntary clenching revealed a consistent decrease in muscle activity over time. Mandibular resting position assessments showed both increases and no significant changes in muscle activity. However, the existing literature is insufficient to draw concrete conclusions; therefore, well-conducted further research is needed to confirm this statement. Registration This systematic review and meta-analysis were registered in the International Prospective Register of Systematic Reviews (PROSPERO CRD42024522231).

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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The effect of clear aligner treatment on masticatory muscles (masseter, temporalis) activity in adults: a systematic review and meta-analysis

Lekavičiūtė,

Paldauskaitė,

Stučinskaitė

et al. 2024

European Journal of Orthodontics

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Masticatory function between chewing with and without wearing clear thermoplastic appliances

Jirawiwatsaree,

Changsiripun

2024

BMC Oral Health

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Background Clear thermoplastic materials are used in a variety of oral appliances. In some situations, patients may wear clear thermoplastic appliances while eating. However, the effect of wearing clear thermoplastic appliances on chewing efficiency is unknown. This study aimed to evaluate the differences in masticatory function between chewing with and without wearing clear thermoplastic retainers over a 6-month period, and its associated factors. Methods Thirty patients who received upper and lower clear retainers after debonding fixed appliances were examined for objective and subjective masticatory function at retainer delivery (T0), 3-month (T1), and 6-month follow-ups (T2) in two conditions: with and without wearing their retainers while chewing. The objective method used multiple sieves reported as the median particle size (MPS). The food intake ability (FIA) test served as the subjective method. Paired t -test was used to compare the outcomes between chewing with and without retainers at each evaluation time point. Repeated measures ANOVA followed by the Bonferroni post-hoc test was used to compare the outcomes between the three evaluating time points. Multivariable linear regression analysis was performed to assess whether age, sex, and extraction/non-extraction was associated with these effects. Results The MPS was significantly greater when chewing with retainers compared with chewing without them at T0 ( P < 0.05), however, it was not significantly greater at T1 and T2 ( P > 0.05). The MPS with and without the retainers tend to decrease between T0, T1 and T2. In particular, the MPS while chewing with retainers significantly decreased between T0 and T1. The total FIA score and FIA subscores for hard and soft food were significantly lower when eating with retainers at T0 ( P < 0.05), however, all FIA scores when eating without retainers did not significantly change between T0, T1, and T2. No significantly associated factors were identified. Conclusions Wearing clear retainers while chewing decreases objective and subjective masticatory function immediately after completing orthodontic treatment. However, this significantly improved to levels comparable to chewing without retainers after a 3-month follow-up. Age, sex, and extraction/non-extraction treatment were not associated with the difference in masticatory function while chewing with and without wearing the retainers.

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Masticatory muscle activity and oral health-related quality of life in patients wearing clear thermoplastic versus wrap-around retainers

Cited by 2 publications

References 32 publications

The effect of clear aligner treatment on masticatory muscles (masseter, temporalis) activity in adults: a systematic review and meta-analysis

The effect of clear aligner treatment on masticatory muscles (masseter, temporalis) activity in adults: a systematic review and meta-analysis

Masticatory function between chewing with and without wearing clear thermoplastic appliances

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