Pain to cold food ingestion following root canal therapy: where is the source?

Two cases of pain evoked by cold food ingestion, following root canal therapy, are presented. The source of pain was detected when cold application to the vestibular, periapical area corresponding to the teeth involved evoked strong pain of about 30-second durations. In the first case, the patient suffered from strong pain in the mandibular right area over the last 4 months. After successive root canal therapy of three mandibular right teeth, the spontaneous pain eased significantly, but strong pain evoked by cold food ingestion persisted. Cold application to the vestibular periapical area of teeth involved identified the source of pain, which was abolished by 80 mg/day of slow-release propranolol. In the second case, cold allodynia developed after root canal therapy. The root canal therapy was performed for prosthetic reasons with no prior pain. Pain could be duplicated by cold application to the vestibular area of the treated tooth. The patient preferred no treatment when the source of pain was explained. In both cases cold application did not produce any pain in other intraoral locations, including the contralateral vestibular area or the mid soft or hard palate. Pain mechanisms, neurovascular and neuropathic, which differ for each case are discussed.

Photobiomodulation alleviates Burning Mouth Syndrome pain: Immediate and weekly outcomes explored.

Burning Mouth Syndrome (BMS) is an intraoral chronic burning or dysesthetic sensation, without clinically evident causative lesions on clinical examination and investigation. AIM: To assess immediate and weekly effects of photobiomodulation (PBM) on BMS patients. METHODS: Thirty BMS patients were treated intra-orally with photobiomodulation 940(±10) nm (InGaAsP) 3 W, semi-conductor diode, weekly, for up to 10 weeks. Pain intensity, measured using the Visual Analogue Scale (VAS), and characteristics were recorded immidiately after each treatment, along with a weekly average VAS. RESULTS: Immediate mean VAS score decreased from a starting score of 7.80 ± 1.83 to 2.07 ± 2.55 (p < 0.001). The mean weekly VAS score for the week after the final treatment session was higher (5.73 ± 2.80, p < 0.001) than the immediate response, but still significantly lower than the starting score (p = 0.017). We observed a trend of pain improvement with more treatments, but this was only statistically significant up to the third treatment. Male gender and unilateral pain correlated with better PBM efficacy (p = 0.017, 0.022, respectively). CONCLUSION: PBM provides significant immediate pain relief for BMS patients after each treatment; however, the efficacy decreases notably over the following week. A trend of increasing pain relief across treatments was observed, statistically significant up to the third treatment.

Pharmacological Topical Therapy for Intra-Oral Post Traumatic Trigeminal Neuropathic Pain: A Comprehensive Review.

Background: The efficacy of topical treatments in alleviating neuropathic pain is well-established. However, there is a paucity of research on topical interventions designed specifically for intra-oral application, where the tissue composition differs from that of exposed skin. Methods: This comprehensive review endeavors to assess the extant evidence regarding the efficacy of topical treatments in addressing neuropathic pain within the oral cavity. Utilizing combinations of search terms, we conducted a thorough search across standard electronic bibliographic databases-MEDLINE (via PubMed), Embase, Google Scholar, and Up to Date. The variables under scrutiny encompassed topical treatment, local intervention, chronic oral and orofacial pain, and neuropathic pain. All pertinent studies published in the English language between 1992 and 2022 were included in our analysis. Results: Fourteen relevant manuscripts were identified, primarily consisting of expert opinions and case reports. The comprehensive review suggests that topical treatments, especially when applied under a stent, could be effective in mitigating neuropathic pain in the oral area. However, it is crucial to conduct further studies to confirm these preliminary results. The limitations of the reviewed studies, mainly the reliance on expert opinions, small sample sizes, inconsistent study designs, and a lack of long-term follow-up data, highlight the need for more rigorous research. Conclusions: Although initial findings indicate topical treatments may be effective for oral neuropathic pain, the limitations of current studies call for more thorough research. Further comprehensive studies are essential to validate the efficacy of these treatments, standardize procedures, and determine long-term results. This will provide clearer guidance for treating chronic neuropathic pain in the oral cavity.

Patient profiles and success rates under different sedation techniques in a tertiary care center.

OBJECTIVES: Sedation is commonly utilized for individuals otherwise unable to receive dental treatment, such as those with disabilities, medically complex conditions, and dentophobics. The aim was to characterize the profiles of patients receiving various types of sedation and assess the corresponding success rates. METHOD AND MATERIALS: This was a 5-year records-based retrospective study. Data regarding the indication for sedation, medical history, sedation type, and treatments performed were recorded. RESULTS: In total, 103 patients underwent 389 treatment sessions under sedation; 42.7% of the patients were disabled. The most commonly administered sedation was moderate sedation, (49.4%), followed by deep (36.8%) and inhaled sedation (13.9%). Successful treatment results were achieved in 96.1% of sessions, with no adverse effects noted during recovery. The high success rates were independent of patient age, sex, and sedation type. There was a positive association between the indication for sedation and the type of sedation. The medically complex patients and the dentophobic patients received mainly moderate sedation (85.3% and 58.2%, respectively), whereas the disabled patients received deep sedation (51.2%). In total, 94% of patients were returning (re-visiting) patients. A statistically significant association was found between the type of sedation administered and the success rate during the first and last sessions (P < .001). The success rate at the first session may be predictive of the success in subsequent sessions. CONCLUSION: A significant positive correlation was found between patient characteristics and the chosen sedation type leading to a high success rate across the various sedation modalities.

Oxidative stress-mediated proapoptosis signaling: A novel theory on the mechanism underlying the pathogenesis of burning mouth syndrome.

BACKGROUND: Burning mouth syndrome (BMS) is a chronic oral pain disorder characterized by a generalized burning sensation in the oral mucosa without apparent medical or dental causes. Despite various hypotheses proposed to explain BMS pathogenesis, a clear understanding of the cellular-level events and associated histologic and molecular findings is lacking. Advancing our understanding of BMS pathogenesis could facilitate the development of more targeted therapeutic interventions. TYPES OF STUDIES REVIEWED: The authors conducted an extensive literature search and review of cellular mechanisms, focusing on evidence-based data that support a comprehensive hypothesis for BMS pathogenesis. The authors explored novel and detailed mechanisms that may account for the characteristic features of BMS. RESULTS: The authors proposed that BMS symptoms arise from the uncontrolled activation of proapoptotic transmembrane calcium permeable channels expressed in intraoral mucosal nerve fibers. Elevated levels of reactive oxygen species or dysfunctional antiapoptosis pathways may lead to uncontrolled oxidative stress-mediated apoptosis signaling, resulting in upregulation of transmembrane transient receptor potential vanilloid type 1 and P2X 3 calcium channels in nociceptive fibers. Activation of these channels can cause nerve terminal depolarization, leading to generation of action potentials that are centrally interpreted as pain. CONCLUSIONS AND PRACTICAL IMPLICATIONS: The authors present a novel hypothesis for BMS pathogenesis, highlighting the role of proapoptotic transmembrane calcium permeable channels and oxidative stress-mediated apoptosis signaling in the development of BMS symptoms. Understanding these underlying mechanisms could provide new insights into the development of targeted therapeutic interventions for BMS. Additional research is warranted to validate this hypothesis and explore potential avenues for effective management of BMS.

Exploring the Effect of Ethnicity on Chronic Orofacial Pain: A Comparative Study of Jewish and Arab Israeli Patients.

The relationship between ethnicity and chronic pain has been studied worldwide. The population of Israel includes two main ethnic groups, 75% Jews and 21% Arabs. The purpose of this study was to compare orofacial chronic pain characteristics and treatment outcomes between Jewish and Arab Israeli citizens. Two hundred patients admitted to the Orofacial Pain Clinic at Hebrew University-Hadassah School of Dental Medicine between 2017 and 2022 were selected randomly for this historical cohort study. Our cohort included 159 (79.5%) Jews and 41 (20.5%) Arabs. Twenty-six pain-related variables were compared of which only two differed significantly between the two groups, awakening due to pain and mean muscle sensitivity; both indicators were higher in the Arab group (p < 0.05). No differences were found in any of the other variables such as diagnosis, pain severity, onset, and treatment outcome. This minimal difference may be explained by the equal accessibility to medical services for all citizens, and the diversity of our staff that includes Jew as well as Arab service providers. These factors minimize or even eliminate racial bias, language, and cultural barriers, and is reflected in the minor differences in orofacial pain characteristics found between the two main ethnic groups in Israel.

Orofacial Migraine or Neurovascular Orofacial Pain from Pathogenesis to Treatment.

The purpose of the present study is to examine possible differences between orofacial migraine (OFM) and neurovascular orofacial pain (NVOP). Facial presentations of primary headache are comparable to primary headache disorders; but occurring in the V2 or V3 dermatomes of the trigeminal nerve. These were classified and recently published in the International Classification of Orofacial Pain, 1st edition (ICOP). A category in this classification is "orofacial pains resembling presentations of primary headaches," which encompasses OFM and NVOP. The differences between NVOP and OFM are subtle, and their response to therapy may be similar. While classified under two separate entities, they contain many features in common, suggesting a possible overlap between the two. Consequently, their separation into two entities warrants further investigations. We describe OFM and NVOP, and their pathophysiology is discussed. The similarities and segregating clinical signs and symptoms are analyzed, and the possibility of unifying the two entities is debated.

Salivary Endocannabinoid Profiles in Chronic Orofacial Pain and Headache Disorders: An Observational Study Using a Novel Tool for Diagnosis and Management.

The endocannabinoid system is involved in physiological and pathological processes, including pain generation, modulation, and sensation. Its role in certain types of chronic orofacial pain (OFP) has not been thoroughly examined. By exploring the profiles of specific salivary endocannabinoids (eCBs) in individuals with different types of OFP, we evaluated their use as biomarkers and the influence of clinical parameters and pain characteristics on eCB levels. The salivary levels of anandamide (AEA), 2-arachidonoyl glycerol (2-AG), and their endogenous breakdown product arachidonic acid (AA), as well as the eCB-like molecules N-palmitoylethanolamide (PEA) and N-oleoylethanolamide (OEA), were assessed in 83 OFP patients and 43 pain-free controls using liquid chromatography/tandem mass spectrometry. Patients were grouped by diagnosis: post-traumatic neuropathy (PTN), trigeminal neuralgia (TN), temporomandibular disorder (TMD), migraine, tension-type headache (TTH), and burning mouth syndrome (BMS). Correlation analyses between a specific diagnosis, pain characteristics, and eCB levels were conducted. Significantly lower levels of 2-AG were found in the TN and TTH groups, while significantly lower PEA levels were found in the migraine group. BMS was the only group with elevated eCBs (AEA) versus the control. Significant correlations were found between levels of specific eCBs and gender, health-related quality of life (HRQoL), BMI, pain duration, and sleep awakenings. In conclusion, salivary samples exhibited signature eCBs profiles for major OFP disorders, especially migraine, TTH, TN, and BMS. This finding may pave the way for using salivary eCBs biomarkers for more accurate diagnoses and management of chronic OFP patients.

Topical tretinoin treatment for burning mouth syndrome: a pilot study.

OBJECTIVES: Burning mouth syndrome is an intraoral chronic pain condition characterized by a moderate to severe sensation of burning from the oral mucosa. No clinical signs are found and there is no efficient treatment. METHOD AND MATERIALS: This pilot study included 10 women that were resistant to other previous treatments or noncompliant to systemic medications. Patients were asked to apply tretinoin gel 0.05% on their tongues twice daily for 14 days. Treatment effectiveness was assessed by completing a pre-study psychologic questionnaire and recording a daily wellbeing and pain log. RESULTS: Significant pain-score decrease in 50% of the patients (delta numerical rating score -3.15 ± 3.02, P value = .005) was recorded. This finding was in concordance with the verbal statements including major quality-of-life improvement (P value = .05), without any treatment positive or negative predictive factors. CONCLUSIONS: Topical tretinoin exhibits potential efficacy in patients with treatment resistant burning mouth syndrome and may also be used as a primary treatment modality.

Reduced Endocannabinoid Tone in Saliva of Chronic Orofacial Pain Patients.

BACKGROUND: the endocannabinoid system (ECS) participates in many physiological and pathological processes including pain generation, modulation, and sensation. Its involvement in chronic orofacial pain (OFP) in general, and the reflection of its involvement in OFP in salivary endocannabinoid (eCBs) levels in particular, has not been examined. OBJECTIVES: to evaluate the association between salivary (eCBs) levels and chronic OFP. METHODS: salivary levels of 2 eCBs, anandamide (AEA), 2-arachidonoylglycerol (2-AG), 2 endocannabinoid-like compoundsN-palmitoylethanolamine (PEA), N-oleoylethanolamine (OEA), and their endogenous precursor and breakdown product, arachidonic acid (AA), were analyzed using liquid chromatography/tandem mass spectrometry in 83 chronic OFP patients and 43 pain-free controls. The chronic OFP patients were divided according to diagnosis into musculoskeletal, neurovascular/migraine, and neuropathic pain types. RESULTS: chronic OFP patients had lower levels of OEA (p = 0.02) and 2-AG (p = 0.01). Analyzing specific pain types revealed lower levels of AEA and OEA in the neurovascular group (p = 0.04, 0.02, respectively), and 2-AG in the neuropathic group compared to controls (p = 0.05). No significant differences were found between the musculoskeletal pain group and controls. Higher pain intensity was accompanied by lower levels of AA (p = 0.028), in neuropathic group. CONCLUSIONS: lower levels of eCBs were found in the saliva of chronic OFP patients compared to controls, specifically those with neurovascular/migraine, and neuropathic pain. The detection of changes in salivary endocannabinoids levels related to OFP adds a new dimension to our understanding of OFP mechanisms, and may have diagnostic as well as therapeutic implications for pain.

The Impact of Expectation for Pain Relief on Orofacial Pain Treatment Outcomes.

Aims: To examine the effects of expectations for pain relief on the objective and subjective outcome of chronic orofacial pain (OFP) treatment. Materials and Methods: Sixty individuals referred to the Orofacial Pain Clinic at the Hebrew University-Hadassah School of Dental Medicine between 2015 and 2017 with OFP reported their expectation for pain relief upon initial consultation. They were also interviewed by telephone after treatment and asked to recall their expectations, referred to as "recalled expectations" (RE). Correlations between RE and treatment success were calculated from pain diaries, and from subjective pain improvement rates (PIR) reported by the patients. Results: 21 males (35.0%) and 39 females (65%), mean age of 46.90 ± 15.77 years and mean pain duration of 49.07 ± 51.95 months participated in the study. All participants rated their expectations as "10" on a 0 to 10 scale during their first visit. RE did not correlate with diary ratings, (P = 0.773) but inversely correlated (-0.3) with PIR (P = 0.020) treatment outcomes. Conclusions: Expectations for pain relief, reported as 10 on a 0-10 scale during the first appointment, may reflect the patient's desire for complete relief of their pain rather than their expectations. Clinicians should therefore be aware of the need for clear communication and wording when examining for expectations. Inverse correlation between recalled expectations and subjective outcome may be due to the nature of recalled expectations when patients already knew their treatment outcomes, and may be explained by the concept of cognitive dissonance.

Long-term adherence to oral stabilization splints: does pain matter?

OBJECTIVE: Occlusal stabilization splints (OSSs) are first-line therapy for temporomandibular disorder (TMD) and sleep-related-bruxism (SRB). The main goal of this study was to quantify adherence rates to OSS therapy in TMD patients and among non-painful conditions such as clenching and bruxism. It was hypothesized that adherence rates would be similar to those for other chronic conditions. METHOD AND MATERIALS: Medical records of 99 patients seen in the Orofacial Pain Clinic between 2006 and 2014 were reviewed. Patients meeting the inclusion criteria were interviewed over the telephone regarding OSS adherence. RESULTS: Of the 99 patients interviewed, 80 had chronic orofacial pain related to TMD and 19 received OSS due to (non-painful) SRB. Patients were divided according to usage; the USER group (58 patients, 58.6%) used their OSS for more than 1 year; the NUSE group was the remaining 41 (41.4%) patients who used their device for less than 1 year. Of the patients with pain as the reason for OSS use, 50 (62.5%) were in the USER group and 30 (37.5%) were in the NUSE group. The most common diagnosis was masticatory muscle disorders (MMD) with a 71.4% adherence rate, representing 60.3% of the USER group, which was significantly higher than those with SRB and other facial pain (P = .039). The most common reasons for non-adherence were sleep difficulties with OSS (31.6%) and resolution of the problem (25%). CONCLUSIONS: Patients reporting mild to major pain reduction had higher adherence rates than those with complete pain relief or none at all. Patients with MMD exhibited higher adherence rates than those with other facial pain types and SRB.

Pain characteristics in medication-related osteonecrosis of the jaws.

PURPOSE: To characterise pain from medication-related osteonecrosis of the jaws (MRONJ) and the effects of antimicrobial treatment on it. METHODS: Data from files of patients diagnosed with MRONJ according to the position paper of the American Association of Oral and Maxillofacial Surgeons (2014) and Multinational Association of Supportive Care in Cancer and American Society of Clinical Oncology (2019) were collected retrospectively, including gender, age, primary disease, bone-modifying agents (BMAs)/anti-angiogenics, administration route, involved jaw, location, and exposure size. The patients were treated according to the abovementioned position papers' recommendations, i.e. all patients who suffered from pain were staged as 2 or 3 and treated with systemic amoxicillin, or doxycycline or clindamycin in case of sensitivity, and local antiseptic and hygiene instructions. RESULTS: Data from 77 MRONJ patients (aged 65.09 ± 11.9 years old) were analysed. Most (90.1%) received bisphosphonates for cancer (79%) and osteoporosis (17%). A total of 67.5% experienced pain; 36.5% had moderate-to-severe pain. Female gender was significantly associated with the presence of pain (p = 0.002). Osteonecrosis lesions after dento-alveolar surgery had a higher risk of pain development than spontaneous lesions (p = 0.045). Medical and oncologic background, type of pharmacotherapy, lesion size, and location were not associated with pain levels. Worse initial pain was significantly associated with better relief following MRONJ treatment (p = 0.045). Meaningful pain reduction (≥ 50%) was significantly correlated with initial pain severity (p = 0.0128, OR = 4.75). CONCLUSIONS: Pain from infection and inflammation often accompanies MRONJ. The presence of pain is correlated with longer BMAs pre-therapy and if surgery preceded the MRONJ. Persistency of the mild pain together with a resistance to common antimicrobial treatment, although not complete, is a feature that MRONJ pain shares with neuropathic-"like" pain, and requires further study and consideration during treatment.

New International Classification of Orofacial Pain: What Is in It For Endodontists?

Pain is a common symptom in endodontic conditions, but differential diagnostic procedures are often needed to exclude other pain origins. Thus, general dentists and endodontists need to be aware of alternative painful orofacial conditions and be able to identify them. The new International Classification of Orofacial Pain (ICOP) is the first comprehensive classification that uniquely deals with orofacial pain. The ICOP is a hierarchical classification modeled on the International Classification of Headache Disorders and covers pain in dentoalveolar and anatomically related tissues, muscle pain, temporomandibular joint pain, neuropathic pain affecting cranial nerves, pain resembling primary headaches, and idiopathic pain in the orofacial region. A description of each condition is given, and structured diagnostic criteria for each condition are proposed based on research data when available. This narrative review aims (1) to give an overview and brief explanation of the ICOP system, (2) to describe and give examples of how it can be of use to general dentists and endodontists with special attention to differential diagnosis of tooth pain, and (3) to highlight how endodontic research can contribute to validation and improvement of the classification. A comparison to other classification and diagnostic systems is also included.

Cervical Muscle Tenderness in Temporomandibular Disorders and Its Associations with Diagnosis, Disease-Related Outcomes, and Comorbid Pain Conditions.

AIMS: To analyze cervical tenderness scores (CTS) in patients with various temporomandibular disorders (TMD) and in controls and to examine associations of CTS with demographic and clinical parameters. METHODS: This case-control study included 192 TMD patients and 99 controls diagnosed based on a questionnaire and a clinical examination following the Research Diagnostic Criteria for Temporomandibular Disorders (RDC/TMD) guidelines. CTS, adapted from the widely used total tenderness score, was the mean sum of the palpation scores from the suboccipital, sternocleidomastoid, and trapezius muscles. Depending on the variables, data were analyzed using Pearson chi-square, analysis of variance, t test, Bonferroni post hoc adjustment, and/or multivariate linear regression analyses. RESULTS: CTS was higher in TMD compared to controls (P < .001). Across TMD subgroups, CTS was notable only in those with a myogenous TMD diagnosis, but not in arthrogenous TMD (P = .014). CTS was positively associated with: female sex (P = .03), whiplash history, higher verbal pain scores, comorbid headaches, body pain, increased pain on mouth opening, and higher masticatory muscles tenderness scores (MTS) (P < .001 for all). Sex (P < .001), MTS (P < .001), comorbid headache (P = .042), and pain on opening (mild: P = .031; moderate: P = .022) retained significant associations with CTS in the multivariate analysis, and these main effects were influenced by interactions with whiplash history and comorbid body pain. CONCLUSION: CTS differentiated between TMD patients and controls and between TMD diagnoses. Specific patient and pain characteristics associated with poor outcome in terms of CTS included effects of interactions between myogenous TMD, female sex, whiplash history, comorbid body pain and headaches, and pain on opening. It can therefore be concluded that routine clinical examination of TMD patients should include assessment of the cervical region.

Features of Neurovascular Orofacial Pain Compared to Painful Posttraumatic Trigeminal Neuropathy.

AIMS: To test and re-examine the diagnostic criteria for neurovascular orofacial pain (NVOP) compared to posttraumatic trigeminal neuropathy (PTTN). METHODS: Pain and patient characteristics were compared in patients with NVOP, PTTN, and NVOP initiated by trauma (PT-NVOP). NVOP criteria were based on prior studies, and PTTN was defined according to the International Classification of Headache Disorders, version 3 beta. RESULTS: Of the 170 patients in the cohort, 90 had PTTN, 51 had NVOP, and 29 had PT-NVOP. None of the tested parameters in the NVOP and PT-NVOP patients were significantly different, and therefore these patients were combined into one group (T-NVOP). T-NVOP differed significantly from PTTN (P < .001) in periodic pain patterns, presence of autonomic and systemic signs, throbbing pain quality, and frequency of bilaterality. Pain quality in PTTN was more burning/stabbing than in NVOP (P = .003). Pain severity, waking from sleep, muscle sensitivity to palpation, and demographics were comparable. CONCLUSION: NVOP differs from PTTN in parameters essential to diagnosis: periodicity of pain, presence of autonomic and systemic accompanying signs, throbbing pain quality, and bilateral presentation. NVOP is amenable to abortive and prophylactic antimigraine therapies, distinguishing NVOP from PTTN in clinical features, treatment, and prognosis.

Nortriptyline Compared to Amitriptyline for the Treatment of Persistent Masticatory Myofascial Pain.

AIMS: To evaluate and compare the pharmacotherapeutic efficacies of two tricyclic antidepressant (TCA) drugs for masticatory myofascial pain (MFP): nortriptyline (NOR) and amitriptyline (AMI). METHODS: Fifty patients with chronic MFP were included in the study; 30 were medicated with AMI only, and 20 took NOR after discontinuing AMI due to adverse effects. Pain diaries recording verbal pain scores (VPS) were utilized to compare posttreatment scores to baseline scores. Chi-square and t tests were used to analyze the data. RESULTS: Across both groups, the mean ± standard deviation VPS score at the end of treatment (2.92 ± 3.2) was significantly lower compared to baseline (6.4 ± 1.75; P < .0001) and was a clinically meaningful (≥ 50%) difference. Initial VPS scores were similar in the AMI and NOR groups (6.27 ± 1.92 and 6.78 ± 1.98). At the end of the study, NOR patients reported a lower final VPS compared to AMI patients (2.83 ± 3.06 vs 4.55 ± 2.92; P = .039). The 50% improvement rate with NOR treatment was better than with AMI treatment (P = .036). The same maximal dosages were used by the patients who achieved a ≥ 50% success rate (20.96 ± 5.036 mg) than those who did not (21.667 ± 5.036 mg). CONCLUSION: TCAs are effective in reducing pain in patients with chronic MFP. NOR seems more effective and better tolerated than AMI, but due to study limitations, more data are needed to confirm these results.

Muscle tenderness score in temporomandibular disorders patients: A case-control study.

BACKGROUND: The total tenderness score (TTS) is commonly used in headache practice and contributes valuable information. OBJECTIVE: To assess muscle tenderness scores in patients diagnosed with Temporomandibular disorders (TMD) and analyse their associations with various demographic and clinical parameters. METHODS: Masticatory (MTS), cervical (CTS) and TTSs were analysed in this case-control study among 192 TMD patients and 99 controls. The study included a questionnaire and a clinical examination following RDC/TMD guidelines. Data were analysed using: Pearson's chi-square, analysis of variance, t test and Bonferroni post hoc. To examine the factors associated with MTS score in a multivariate manner, a conceptual hierarchical multiple regression model was adopted. RESULTS: Masticatory and TTS differed between TMD sub-groups and controls. Muscle tenderness was positively associated with: female sex, whiplash history, parafunction, co-morbid pains such as headaches and body pain, pain intensity, onset, frequency and duration. In the conceptual hierarchical multiple regression model, pain onset, frequency and duration, co-morbid pains were mediators in the relationship between TMD diagnosis and MTS. CONCLUSION: Muscle tenderness scores were positively associated with TMD disease characteristics and co-morbid pain conditions, which may reflect associations with disease severity. MTS differed between TMD populations and may be used in routine patient workup, to assess MMD severity and changes over time as well as treatments response and as a research tool. MTS can be used as a common methodology to describe both headaches and masticatory muscle disorders and to facilitate interprofessional research and crosstalk between a headache and oro-facial pain practitioners.

Maxillary deformity following CPAP treatment in myasthenia gravis.

OBJECTIVE: Patients with Myasthenia gravis (MG) are characterized by muscle weakness that may cause obstructive sleep apnea (OSA). The use of a continuous positive airway pressure (CPAP) device is often needed in order to maintain free breathing during the night and sometimes even during the day. CLINICAL PRESENTATION: A 29-year-old MG patient is presented who used a CPAP continuously since the age of 12. Tight fitting of a nasal mask applied enough force to cause severe maxillary deformity. CLINICAL RELEVANCE: Masks with additional forehead and chin support or a regular full face mask are recommended for patients with muscle weakness, in order to spread forces more evenly.