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Background: Care should be neutral and equal, but normative beliefs may impact the interaction between patients and healthcare professionals in pain management.

Objectives: To explore how patients with jaw and neck pain perceive pain management and the interaction with healthcare professionals in relation to intersectionality, with a specific focus on gender.

Methods: Recruitment was performed at a specialist dentistry clinic in Sweden. Inclusion criteria were patients aged 18-70 years, reporting jaw and neck pain and understanding the Swedish language. Exclusion criteria were rheumatic disease, temporomandibular joint arthralgia or arthritis. Using purposive sampling, 16 patients (11 women) aged 19-56 were interviewed using individual semi-structured interviews. The analysis was performed using thematic analysis.

Results: The analysis resulted in the theme: 'Intersectional bias in healthcare - the inequity borne by the patients', with five subthemes that entailed different types of bias related to the participants' personal characteristics and their interaction with healthcare professionals. Health-related stigmata was one subtheme described among participants, resulting in labelling and burden in the encounter. Other subthemes also described bias in relation to biological differences among pain patients and patients not being taken seriously due to, for example, female gender and younger age. Two subthemes also described bias in relation to the healthcare professionals' gender and age.

Conclusion: Normative beliefs have a negative impact on the interaction between patients and healthcare professionals in pain management. Since patient-provider interaction should be neutral and equal, intersectional bias should be acknowledged to prevent health and care inequalities.Keywords: gender differences; healthcare disparities; intersectionality; neck pain; temporomandibular joint disorders.

BACKGROUND: Despite being one of the most common chronic pain conditions, painful temporomandibular disorders (TMDs) are still not included in the Global Burden of Disease (GBD) measures of health loss. A key obstacle is the absence of a lay description that can be used to derive a disability weight reflecting the severity relative to all other diseases' consequences measured in GBD. This study aims to propose lay descriptions of painful TMDs suitable for use within the GBD framework.

METHODS: The process was guided by experts from the Institute for Health Metrics and Evaluation (IHME), USA. A structured consensus process was conducted among international experts, clinicians, and patient representatives in three steps: terminology alignment, roundtable discussions during a workshop, and outcome synthesis. After aligning terminology through introductory lectures, five groups of 8-12 participants reviewed existing lay descriptions for other pain-related disorders. In addition, they discussed lay descriptions and severity states.

RESULTS: No existing descriptions adequately captured the characteristics of painful TMDs. After consensus discussions, the proposed lay description was "Pain in the jaw, face, cheeks, or around the ears, sometimes radiating to the temples or behind the eyes. The pain may be felt as dull, sharp, tense, or stiff, making chewing, talking, or opening the mouth difficult." Duration, intensity, and frequency were identified as important dimensions linked to severity.

CONCLUSIONS: The lay description provides direction on how painful TMDs can be quantified in GBD estimates. Future studies, including those that incorporate patients' perspectives, are essential to ensure alignment with lived experiences.

Introduction:Concurrent pain in the jaw and neck is common; however, little is known about how it develops. Previous studies have focused mainly on biological factors with limited focus on psychosocial factors and patients’ perspectives. To enhance understanding of concurrent jaw and neck pain, knowledge is needed about patients’ perspectives on the development of symptoms and their management within health care that also includes dentistry.

Objective:To explore patients’ perspectives on the development of concurrent jaw and neck pain in relation to navigating the health care system.

Methods:Sixteen individuals (11 women and 5 men, aged 19 to 56 y) with concurrent jaw and neck pain were recruited using purposive sampling. Participants were patients referred to an orofacial pain specialist in Sweden. Individual semi-structured interviews were used and analyzed using qualitative content analysis.

Results:Data analysis resulted in the theme “Seeking understanding, confirmation, and simplified navigation in the health care system.” The main theme consisted of 3 subthemes: (1) understanding and interpreting the body and emotions holistically, (2) seeking affirmation and legitimacy from health care, and (3) wishing for clear and easily navigable health care pathways. Patients expressed thoughts regarding their own sensemaking in respect to causes for their pain. Moreover, they requested confirmation from health care along with simplified health care navigation and a holistic approach regarding pain management.

Conclusions:A mismatch exists between the patient’s own sensemaking regarding the cause of their jaw and neck pain and the care they receive from their health care provider. Having pain from multiple sites that is managed in different medical systems makes it difficult to navigate within health care. A clear care pathway could reduce the risk of pain chronicity, and an increased collaboration between dentistry and medical care would be desirable.

Gender differences in pain reporting and prevalence have been demonstrated. As gender of examiner also affects reporting of pain on palpation, the aim of this study was to evaluate the effects of examiner gender on palpation performance using three different palpation methods. Examiners of both genders were instructed on the correct technique for each palpation method by either a female or male instructor. The target was to achieve a pressure of 100 kPa, corresponding to the 1 kg of force for muscle palpation described in the diagnostic criteria for temporomandibular disorders (DC/TMD). All examiners performed traditional palpation with the index finger, palpation with a palpometer, and a novel bimanual palpation with visual feedback, in a randomized order. The examiner's gender, and its interaction with the gender of the instructor did not significantly affect magnitude, accuracy, or precision of the pressure applied. The method of palpation was the only factor that significantly impacted all metrics. The palpometer achieved the lowest palpation magnitude (mean pressure applied = 113.7  kPa, 95% CI: 109.8-117.6), the highest accuracy (absolute difference = 15.7  kPa, 95% CI: 12.3-19.1), and the highest precision (mean coefficient of variation = 6.8, 95% CI: 6.0-7.6), followed by bimanual palpation and traditional palpation. The results suggest that gender differences in pain reporting in patients are not likely to be a result of the technical aspects associated with the gender of the examiner. Instead, these differences may be attributed to other factors, such as sociocultural influences.

Background: Jaw and neck pain are prevalent and are often concurrent. Despite this, jaw and neck pain are often assessed and managed separately. Jaw pain is mainly treated within dentistry, whereas pain elsewhere in the body is treated within healthcare. Patients with jaw pain have expressed a struggle with finding the right care. Moreover, early identification and treatment are important factors in pain management in terms of the longterm prognosis for the affected individual. This results in suffering over a prolonged time and increased costs for the health care system. The prevalence of jaw pain is twice as high in connection with a whiplash trauma. However, previous studies on the relationship between orofacial pain and whiplash trauma have mainly been cross-sectional. The main purpose of this thesis was to evaluate and explore function, development and perceptions of concurrent jaw and neck pain.

Methods: The thesis is based on four studies, all with different study designs. The studies were conducted at the Department of Odontology, Umeå University, Sweden, in collaboration with Umeå University Hospital, Sweden. In Study I, with an experimental design, the effect of resistance load on jaw and head movements were evaluated among 26 pain-free individuals. Studies II and III were based on a cohort consisting of 292 individuals that entailed 176 whiplash cases and 116 controls at baseline. All individuals answered questionnaires, and 200 of the 292 had a clinical examination at baseline (one month after the trauma). After two years, 223 individuals repeated the questionnaires and 120 of 223 individuals had a second clinical examination. In study II, clinical signs were evaluated, whereas in study III, predictive factors for jaw pain after two years were explored. In study IV, patients' perspectives on the development of concurrent jaw and neck pain in relation to navigating the health care system were explored. Sixteen individuals with concurrent jaw and neck were interviewed using individual semi-structured interviews.

Results: In the experimental study, the ratio between jaw and head movements was increased when resistance load was applied to the lower jaw, which indicates that the neck involvement increased. In the study regarding clinical signs, cases and women presented more pain on palpation at baseline and at the two-year follow-up. In the explorative study, whiplash trauma did not increase the odds for jaw pain over a two-year period. The development and maintenance of further jaw pain after whiplash trauma was not related to the trauma itself but more associated with non-specific physical symptoms or female gender. In the qualitative study, participants expressed that navigating the health care system was perceived as difficult, and they had a holistic approach regarding their pain and mental status.

Conclusions: Within this thesis we have demonstrated that function and pain in the jaw and neck regions are connected. In addition, navigating the health care system was perceived as difficult, and sufferers wanted to receive confirmation from their health care providers. Therefore, dentistry and healthcare should be aware of the connection between jaw and neck pain. Moreover, an increased collaboration is needed between dentistry and healthcare in terms of multidisciplinary management using a biopsychosocial perspective.

Objectives: To explore predictive factors for the development and maintenance of jaw pain over a 2-year period.

Methods: One hundred nineteen cases (73 women) and 104 controls (59 women), mean age 34.9 years (SD 13.9), attended baseline and 2-year follow-up examinations. The whiplash cases visited the emergency department at Umeå University Hospital, Sweden, with neck pain within 72 h following a car accident, and baseline questionnaires were answered within a month after trauma. Controls were recruited via advertising. Inclusion criteria were age 18–70 years, living in Umeå municipality and Swedish speaking. The exclusion criterion was neck fracture for cases and a previous neck trauma for controls. Validated questionnaires recommended in the standardized Research Diagnostic Criteria for temporomandibular disorders were used. Jaw pain was assessed by two validated screening questions answered with “yes” or “no.” A logistic regression analysis was used to predict the outcome variable jaw pain (yes/no) after 2 years.

Results: Whiplash trauma did not increase the odds of development of jaw pain over a 2-year period (OR 1.97, 95% CI 0.53–7.38). However, non-specific physical symptoms (OR 8.56, 95% CI 1.08–67.67) and female gender (OR 4.89, 95% CI 1.09–22.02) did increase the odds for jaw pain after 2 years.

Conclusion: The development and maintenance of jaw pain after whiplash trauma are primarily not related to the trauma itself, but more associated with physical symptoms.

Clinical relevance: The development of jaw pain in connection with a whiplash trauma needs to be seen in a biopsychosocial perspective, and early assessment is recommended.

Background: Pain in the orofacial region is often reported after whiplash trauma. However, prospective studies evaluating clinical signs related to orofacial pain and disability in whiplash populations are rare. The aim of the present study was to evaluate clinical signs related to pain and dysfunction in orofacial and neck regions after whiplash trauma, in a short- and long-term perspective.

Methods: In total, 84 cases (48 women) diagnosed with neck distortion after a car accident and 116 controls (68 women) were examined within 1 month, and 49 cases (27 women) and 71 controls (41 women) were re-examined 2 years later. Outcome measures were pain on palpation of jaw and neck muscles and maximal jaw opening. Analysis was performed using mixed-models.

Results: Cases and women were at higher risk for pain on palpation of jaw muscles (OR:7.7; p < 0.001 and OR:3.2; p = 0.010 respectively) and neck muscles (OR:12.7; p < 0.001 and OR:2.9; p = 0.020 respectively) but with no significant effect of time. Cases and women also had lower maximal jaw opening (−3.1; p = 0.001 and −3.3; p = 0.001 respectively). There was no significant time effect, but a significant interaction between cases and time (2.2; p = 0.004).

Conclusion: Individuals with a whiplash trauma present a higher risk for pain on palpation in jaw and neck muscles both in a short- and long-term perspective, but show normal jaw movements. No time effect suggests that cases do not spontaneously improve nor get worse. Investigating pain on palpation in the jaw and neck muscles after whiplash trauma can identify individuals at risk for developing long-term orofacial pain and dysfunction.

Significance: Orofacial pain is often reported after whiplash trauma but most previous studies concerning orofacial pain in whiplash populations have been questionnaire studies. Cases with a previous whiplash trauma and women, in general, had higher risk for pain on palpation in the jaw and neck region. Investigating pain on palpation after a whiplash trauma can help to identify individuals at risk of developing long-lasting pain in the orofacial region.

Background:  The jaw and neck motor systems have a close functional integration but the effect of resistance load to the mandible during jaw opening on the jaw-neck integration is not known.

Objectives:  To evaluate the effect of resistance load compared to no load on integrated jaw and neck motor function in individuals free from pain and dysfunction in the jaw and neck regions.

Methods:  Jaw and head movements during continuous jaw opening were recorded with an optoelectronic system (MacReflex® ) in 26 pain-free individuals (14 women, 12 men, mean age 22 years). Jaw opening was performed with and without resistance load (1600 g) to the mandible. The relationship between jaw movement amplitude, head movement amplitude, head/jaw ratio (quotient of head and jaw movement amplitude) and resistance load were modelled using linear mixed-model analysis. A p-value <.05 was considered statistically significant.

Results:  The expected head/jaw ratio mean was increased by 0.05 (95% CI: 0.03, 0.08, p < .001) with resistance load as compared to no load. This corresponds to an increase in expected mean by 55.6%. With resistance load, expected mean head movement amplitude increased by 1.4 mm (95% CI: 0.2, 2.5, p = .018), and expected mean jaw movement amplitude decreased by 3.7 mm (95% CI: -7.0, -0.5, p = .025).

Conclusion:  There is a compensation and adaptation of integrated jaw-neck motor function with an altered jaw-neck motor strategy during jaw opening with resistance load compared to no load. The head/jaw ratio demonstrates increased proportional involvement of the neck during increased load on the jaw system.