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Betel-quid dependence domains and syndrome associated with betel-quid ingredients among chewers: an Asian multi-country evidence

Lee CH, Chiang SL, Ko AM, Hua CH, Tsai MH, Warnakulasuriya S, et al.

Addiction, 2014 Jul;109(7):1194-204.
PMID: 24650227 DOI: 10.1111/add.12530

Betel-quid (BQ) contains biologically psychoactive ingredients; however, data are limited concerning the symptoms and syndrome of BQ dependence among chewers. The aims of this study were to evaluate the ingredients-associated BQ dependence syndrome and country-specific chewing features and behaviour for BQ dependence among chewers from six Asian communities.

Matched MeSH terms: Mastication*
Fulltext Factors affecting commencement and cessation of betel quid chewing behaviour in Malaysian adults

Ghani WM, Razak IA, Yang YH, Talib NA, Ikeda N, Axell T, et al.

BMC Public Health, 2011;11:82.
PMID: 21294919 DOI: 10.1186/1471-2458-11-82

Betel quid chewing is a common habit widely practiced in Southern Asian populations. However, variations are seen in the content of a betel quid across the different countries. Factors associated with commencement and cessation of this habit has been numerously studied. Unfortunately, data on Malaysian population is non-existent. This study aims to determine the factors associated with the inception and also cessation of betel quid chewing behaviour among Malaysian adults.

Matched MeSH terms: Mastication*
Fulltext Dental Implants - Perceiving Patients' Satisfaction in Relation to Clinical and Electromyography Study on Implant Patients

Alam MK, Rahman SA, Rahaman SA, Basri R, Sing Yi TT, Si-Jie JW, et al.

PLoS One, 2015;10(10):e0140438.
PMID: 26465146 DOI: 10.1371/journal.pone.0140438

The aim of this study is to evaluate the satisfaction of patients with posterior implants in relation to the clinical success criteria and surface electromyography (sEMG) findings of the masseter and temporalis muscles. Total 42 subjects were investigated. Twenty one subjects with posterior dental implants were interviewed using a questionnaire and the clinical success criteria were determined based on The International Congress of Oral Implantologists. The myofunction of the masticatory muscles were assessed using sEMG (21 subjects) and compared to the control group of subjects without implants (21 subjects). Out of 21 subjects, all were satisfied with the aesthetics of their implant. Twenty of them (95.2%) were satisfied with its function and stability. As for clinical criteria, 100% (50) of the implants were successful with no pain, mobility or exudates. sEMG findings showed that patients have significantly lower (p<0.01) basal or resting median power frequency but with muscle burst. During chewing, control subjects showed faster chewing action. There was no difference in reaction and recovery time of clenching for both groups. In conclusion, the satisfaction of implant patients was high, and which was in relation to the successful clinical success criteria and sEMG findings.

Matched MeSH terms: Mastication/physiology
Widespread tannin intake via stimulants and masticatories, especially guarana, kola nut, betel vine, and accessories

Morton JF

Basic Life Sci., 1992;59:739-65.
PMID: 1417698

Tannins are increasingly recognized as dietary carcinogens and as antinutrients interfering with the system's full use of protein. Nevertheless, certain tannin-rich beverages, masticatories, and folk remedies, long utilized in African, Asiatic, Pacific, and Latin American countries, are now appearing in North American sundry shops and grocery stores. These include guarana (Paullinia cupana HBK.) from Brazil, kola nut (Cola nitida Schott & Endl. and C. acuminata Schott & Endl.) from West Africa, and betel nut (Areca catechu L.) from Malaya. The betel nut, or arecanut, has long been associated with oral and esophageal cancer because of its tannin content and the tannin contributed by the highly astringent cutch from Acacia catechu L. and Uncaria gambir Roxb. and the aromatic, astringent 'pan' (leaves of Piper betel L.) chewed with it. In addition to the constant recreational/social ingestion of these plant materials, they are much consumed as aphrodisiacs and medications. Guarana and kola nut enjoy great popularity in their native lands because they are also rich in caffeine, which serves as a stimulant. Research and popular education on the deleterious effects of excessive tannin intake could do much to reduce the heavy burden of early mortality and health care, especially in developing countries.

Matched MeSH terms: Mastication/drug effects
Fulltext Population burden of betel quid abuse and its relation to oral premalignant disorders in South, Southeast, and East Asia: an Asian Betel-quid Consortium Study

Lee CH, Ko AM, Warnakulasuriya S, Ling TY, Sunarjo, Rajapakse PS, et al.

Am J Public Health, 2012 Mar;102(3):e17-24.
PMID: 22390524 DOI: 10.2105/AJPH.2011.300521

We investigated the population burden of betel quid abuse and its related impact on oral premalignant disorders (OPDs) in South, Southeast, and East Asia.

Matched MeSH terms: Mastication*
Fulltext Detection of metabolomic profile of saliva in healthy Malaysian adults

Lee, Han Hing, Lee, Chee Yen, Shoji, Yoshinobu, Chin, Hoe Teh

Compendium of Oral Science, 2015;2(1):40-46.
MyJurnal

Background: Saliva is a readily accessible biofluid that is important for the overall quality of life, func-tionally essential in the chewing, swallowing, tasting, regulation mouth flora and prevention of caries. The aim of this study is to assess the global metabolomic profile of saliva in healthy Malaysian adults. Methods: As a first step to determining and understanding the metabolomic profile of saliva in healthy Malaysian adults, we have collected saliva samples of 50 adults and measured the salivary metabolite to establish a profiling metabolite data, Human Metabolome Database (HMDB). Metabolites concentrations of saliva in healthy subjects were measured by using 1H NMR spectroscopy. Results: The results showed there was no significant inter-individual variations of the key metabolites observed among the healthy Malaysian adults and there was no significant variation of the metabolites between female and male subjects. Conclusion: The metabolomic profile of saliva in healthy Malaysian adults could be used to establish the metabolomic database and used as a comparison for future study of the saliva of specific diseases.

Matched MeSH terms: Mastication
Fulltext Comparative morphology and function of feeding appendages in food intake behaviour of the whiteleg shrimp, Litopenaeus vannamei, and the giant freshwater prawn, Macrobrachium rosenbergii

Kawamura, Gunzo, Bagarinao, Teodora Uy, Nur Syallinaz Seniman, Yong, Annita Seok-Kian, Lim, Leong-Seng

Borneo Journal of Marine Science and Aquaculture, 2018;2(1):26-39.
MyJurnal

Combining feeding appendage morphology and behavioural observation of the motion pattern of the feeding appendages clarified many aspects underlying the feeding processes of the giant freshwater prawn (Macrobrachium rosenbergii) and the marine whiteleg shrimp (Litopenaeus vannamei) in aquaria. The food intake behaviour was video recorded during eating pellet food, and pieces of fresh squid and fish. While M. rosenbergiitook pellet one by one, L. vannamei picked up many pellets at one time and held them at the mouth with the 3rd maxilliped endopods and the 1st walking legs. Both species used the right chelate walking legs rather than the left walking legs to pick up the food. The 3rd walking legs of L. vannameiwere longest and heaviest among the chelate walking legs but their major role was not for feeding but for feeding contests often in the form of aggression. While M. rosenbergii easily crunched pellets by the mandibles, L. vannamei did not crunch pellets due to the softer and not so strong mandibles and frequently spat out them, indicating that the present hard pellets are not suitable for L. vannamei. Both the species kept a piece of elastic fresh squid or fish flesh at the mouth and tore the food into small pieces with the help of repeated pulling down motion of the 3rd maxilliped endopods. However, the mandible teeth of the two spices were not sharp enough to gnaw off the fibrous muscle in one bite. The 2nd and 3rd maxilliped endopods were used for holding food at the mouth and did not contribute to mastication of food. The 2nd and 3rd maxilliped exopods exhibited the horizontal fanning motion, which caused a unidirectional water flow moving backwards in the gill chamber (visualized with milk). The maxilliped exopods were found to contribute not to feeding but ventilation. Based on the results obtained, development of softer pellets was recommended for L. vannamei.

Matched MeSH terms: Mastication
Fulltext Association between tooth loss and body mass index among older adults in Kuala Pilah, Negeri Sembilan

Chan, Yoke Mun, Rahimah Abdul Kadir, Tengku Aizan Abdul Hamid, Tanti Irawati Rosli

Jurnal Sains Kesihatan Malaysia, 2018;16(1):81-86.
MyJurnal

Loss of teeth can affect masticatory efficiency in older adults. This may result in avoidance or modifications in food
choices and lead to lower intake of important nutrients among older individuals. The aim of this study was to determine
the association between tooth loss and body mass index, BMI, among older adults in Kuala Pilah, Negeri Sembilan. A
cross-sectional study was carried out on 428 older adults aged 50 years and above from selected villages in district of
Kuala Pilah. Respondents were interviewed to collect information on their demographic characteristics. Number of tooth
loss was determined through oral assessment, followed by anthropometric assessment to calculate the BMI of respondents.
Findings showed that majority of the respondents were overweight and obese, 40.4% and 19.9% respectively, while only
a small proportion was underweight, 3.9%. The proportion of edentulism (total tooth loss) was 18.3% and majority of
the older adults had lost more than 12 teeth (77.1%) and less than 4 pairs of occluding posterior teeth (86.0%). Total
and partial tooth loss was found to be not significantly associated with BMI. In relation to the arrangement of teeth,
older adults with reduced number of posterior occluding pairs of teeth were more likely to experience unsatisfactory
BMI (OR = 3.61, 95% CI: 1.48, 8.76). This may suggest that functional arrangement of the tooth in the oral cavity is more
important than the number of tooth loss alone. Thus, maintaining an optimum number of teeth for chewing is essential
for maintenance of ideal BMI.

Matched MeSH terms: Mastication
Fulltext Oral microbiome, nutrition and their role in oral carcinogenesis

Mohd Hafiz Arzmi

Malaysian Journal of Medicine and Health Sciences, 2019;15(108):10-10.
MyJurnal

A balanced oral microbiome is essential in maintaining a healthy oral cavity. Oral microbiome comprises of var-ious microorganisms that belong to different kingdoms, including bacteria (bacteriome) and fungal (mycobiome). Multiple factors have been shown in oral carcinogenesis including alcohol consumption, tobacco smoking, betel nut chewing and microbial infections. Since the oral cavity comprises of various microbial kingdoms, thus, in-ter-kingdom interactions are suggested in promoting oral carcinogenesis. Dysbiosis, which is defined as imbalance inter-kingdom microbiome, alone may not cause oral carcinogenesis; thus, it is suggested that nutritional factor may also play a vital role in this disease development. A recent study has shown that sucrose consumption can induce the production of glucosyltransferases (gtfs) by Streptococcus mutans which lead to the increasing attachment of Candida albicans in polymicrobial biofilms form. The yeast has been reported to be potentially involved in oral carcinogenesis, particularly in the immunocompromised patient. This is due to the inflammation that is caused by candidal infection, which increases pro-inflammatory cytokines such as interleukin-6, interleukin-8 and interleu-kin-10, that have been linked to oral carcinogenesis. However, further study is needed to conform to the claim. In addition, over-consumption of alcoholic beverages has also been related to carcinogenesis which the ethanol has been reported to be converted into acetaldehyde by C. albicans using acetaldehyde dehydrogenases enzymes. In Malaysia, oral cancer has also been related to the consumption of cured and salted fish, which mostly consumed by the Chinese ethnics. However, its relationship to oral microbiome remains unclear. In conclusion, oral microbiome and nutrition may have a role in oral carcinogenesis; however, further study is needed to elucidate the role of both factors in oral cancer development.

Matched MeSH terms: Mastication
Fulltext The problems and impacts of orofacial pain among a group of Malaysian aborigines

Yusof ZYM, Mohamed NH, Radzi Z, Yahya NA, Ramli AS, Abdul Kadir R

Ann Dent, 2007;14(1):31-38.
MyJurnal

Background: The high prevalence and impacts of orofacial pain (OFP) have caused major sufferings to individuals and society. The purpose of the study was to investigate the problems and impacts of OFP among a group of Malaysian aborigines. The objectives were to determine (i) the prevalence, aetiology, duration, severity, types and persistence of OFP during the past 3 months preceding the study; (ii) its associated impact on daily performance; and (iii) the measures taken for pain relief.
Methods: This is a cross sectional study carried out in Kuala Lipis, Pahang involving 6 villages of Orang Asli Bateq and Semai. Study sample was chosen using convenient sampling including adults aged 16 years and above. Participants were invited for an interview using structured questionnaire followed by clinical examination. Data analysis was carried out using SPSS ver12.
Results: Response rate was low at 20% (n = 140). Over one-quarter (26.4%) of the sample experienced OFP in the previous 3 months. Toothache was found to be the main aetiology (83.3%) followed by gingival pain (18.9%), temporomandibular joint (10.8%) and facial pain (8.1%). Mean duration of pain was 9.8 days for toothache, 162.4 days for gingival pain, 7.3 days for TMJ and 5.7 days for facial pain. Of those who had OFP, over half rated the pain as moderate (37.8%) and severe (29.7%) and most of the pain was ‘intermittent’ in nature (81.1%). Over half (62.2%) admitted the pain had disappeared during the interview. In terms of pain relief, 56.8% of the sample used traditional medicine. The pain had impacted on the chewing ability (70.3%, p=0.01), ability to sleep at night (73.0%, p<0.001), levels of anxiety (70.3%), ability to perform daily chores (33.3%) and social life (35.1%) of the Orang Asli sample.
Conclusion: This study suggests the prevalence of OFP was high among the Orang Asli sample, which imposed considerable physical and psychological impacts on daily life.
Key words: orofacial pain; impacts; quality of life; Malaysian aborigines

Matched MeSH terms: Mastication
Fulltext A study of patient satisfaction with orthodontic treatment in Sabah

Loke, S.T.

Malaysian Journal of Public Health Medicine, 2002;2(1):42-46.
MyJurnal

The aims of the study were to investigate patient satisfaction and perceived psychosocial benefit from orthodontic treatment and to relate them to factors ajfecting treatment duration and treatment standards. A total of 130 patients (mean age I5 years) who had just completed full fixed appliance therapy (removable appliance) filled questionnaires. There was high proportion of satisfaction with dentofacial appearance (98.5 %), alignment of teeth (100 %), improved mastication (99.2%) and cleaning of teeth (98.5%). About 89.2% would recommend orthodontic treatment to their friends. All surveyed were satisfied with the services provided by the orthodontic staff and kw patients were dissatisfied with the length of each appointment (3.] %), number of appointments (l.5%) and total treatment time (5.4%). The main dissatisfaction appeared to be the long waiting time to be treated during their appointments (10%}. The mean duration of treatment to complete two-arch fixed appliance was I 7.6 months (S.D. 6.8 months) and 89.2% of cases were completed within 24 months. Treatment duration was also associated with pre-treatment ovemet (r=0.23 5), ovetjet d%rence_h·om pre-treatment to post-treatment 0·=0.204} and number of extractions (r=0.305}. Multmle linear regression anahtsis of duration of treatment with these factors accounted for about 7.8% ofthe variability.
Study site: Dental clinic, Kota Kinabalu, Sabah, Malaysia

Matched MeSH terms: Mastication
Fulltext An Epidemiological Survey Of Denture-Related Lesions In A Geriatric Population In Malaysia

Taiyeb Ali, T.B., Zain, R.B., Raja Latifah, Razak, I.A.

Ann Dent, 1998;5(1):-.
MyJurnal

The prevalence of tooth loss amongst the elderly is generally very high. Hence mastication and subsequently nutrition is greatly affected leading to the impairment of their general health. Therefore denture construction is an important aspect in the rehabilitation of the oral and general health in most elderlies. However, poorly constructed dentures and lack of maintenance coupled with various other health and healthrelated problems of the elderly, for instance poor general health especially with immunocompromised states, multiple medication intake, xerostomia, reduced mobility, economic status, mental state and ignorance may all lead to discomfort and denture associated lesions in these elderly patients. No regional studies or data on denture-related lesions in the general population have been reported. Previous epidemiological studies of adults in Malaysia (1,2) and other local studies have not investigated lesions of the oral tissues associated with geriatric denture wearers although studies in developed countries, where prevalence of denture usage is high, have noted that denture-related lesions to be the most common group of oral mucosal lesions in the elderly (3-7). As has been reported in most developing countries, the proportion of elderly in Malaysia is also increasing. It has also been noted that the mean number of teeth present decreases as age increases; in those between 15 to 19 years, all 28 teeth are present, 35 to 44 years-old have 23 teeth whereas those above 65 years retain only 12 teeth. Edentulousness increases from 0% to 7.3% to 56.6% in these age groups respectively (2). It is anticipated that with the increasing population of the elderly in Malaysia and the improving economy, the proportion of denture wearers in the population will increase. In view of the lack of investigations in Malaysia focusing exclusively on this group of lesions, it is therefore the aim of this pilot investigation to highlight the prevalence of denture- related lesions in a representative population of the elderly living in the community, both in the urban and rural areas. It may also form a basis against which future studies can be compared.

Matched MeSH terms: Mastication
Fulltext Effects of tobacco use on oral health - an overview

Awan, K.H.

Ann Dent, 2011;18(1):18-23.
MyJurnal

Tobacco use is linked with many serious illnesses, such as cancer, cardiopulmonary diseases, as well as with many health problems. Every year, the use of tobacco products causes a heavy toll of deaths and severe human disease worldwide. One of the many health problems linked to tobacco use is its detrimental impact on oral health. Tobacco causes a whole series of oral health problems, ranging from life-threatening (precancerous changes leading to oral cancer) and serious (periodontal disease, teeth decay) to social (bad breath). Tobacco is consumed through the mouth in a variety of forms, varied from smoked tobacco to smokeless tobacco chewing on itself or combined with areca nut. All these forms of tobacco have damaging effects on the oral health. The most significant preventive measure to prevent the oral health problems caused by tobacco use is to stop using tobacco products. The risk of developing oral cancer drops rapidly when a smoker ceases tobacco use. After ten years of not using tobacco, an ex-smoker/user's risk of oral cancers is about the same as that for someone who has never smoked. To stop using tobacco products is not an easy task. Fortunately, there are a number of therapies available to assist in quitting of tobacco. It is important to remember that, while it will be difficult, ceasing to use tobacco has immediate health benefits, including increased life expectancy and reduced risk of tobacco related diseases and conditions.

Matched MeSH terms: Mastication
Fulltext Association between muscle activity and overjet in class II malocclusion with surface electromyography

Nishi SE, Basri R, Rahman NA, Husein A, Alam MK

J Orthod Sci, 2018;7:3.
PMID: 29765915 DOI: 10.4103/jos.JOS_74_17

OBJECTIVES: The aim of the study was to assess the association and correlation between the overjet and muscle activity (the masseter and temporalis muscles) in patient with Class II malocclusion in different genders using surface electromyography (sEMG).
MATERIALS AND METHODS: The overjet (measured clinically) and electromyographical activity (rest, chew, post chew rest, clench and post clench rest) of the masseter and temporalis muscle of class II malocclusion patient were assessed in 18 patients (3 males and 15 females) from the School of Dental Science, Hospital University Sains Malaysia.
RESULTS: The results were compared by simple linear regression test to evaluate the association between overjet and muscle activity in different genders. Class II malocclusion patients with increased overjet group showed significant association with masseter muscle activity on chewing stage (P = 0.005, F = 6.081 and adj-R2 = 0.473). Left temporalis muscle in class II malocclusion showed a significant linear association (P = 0.014, F = 0.812 and adj-R2= -0.034) with gender during clench.
CONCLUSION: In conclusion, class II malocclusion patient with increased overjet can affect masticatory muscle function and as well as clench force may differ in gender.

Matched MeSH terms: Mastication
Fulltext Teeth and Covariates: Association with Risk of Falls

Kohli S, Wui Vun AL, Daryl Philip C, Muhammad Aadil C, Ramalingam M

Int J Dent, 2018;2018:7127209.
PMID: 30034470 DOI: 10.1155/2018/7127209

Purpose: Falls occur commonly in geriatric populations and undesirably influence their life, morbidity, and mortality. The aim of this study was to analyze the association between the number of teeth present among the elderly population and covariates in relation to the risk of falls.
Materials and Methods: This study was conducted at various old age homes in the Klang Valley region of Malaysia involving the geriatric population aged 60 years and above. A detailed questionnaire consisting of sociodemographic data including sex, age, household income, and dental variables such as the number of teeth and chewing difficulty was obtained. The Tinetti test (TT) was used to evaluate the patients' ability to walk, to maintain postural balance, and to determine their risk of falling. The short version of the Geriatric Depression Scale was used to assess depression among the participants, and the Barthel Scale was used to analyze the subject's ability to perform the activities of daily living (ADL).
Results: Statistically significant association was observed in relation to the number of teeth present and risk of falls (p < 0.05). Subjects who had 19 teeth or less in total had moderate to highest risk of falls (p=0.001) in comparison with subjects who had 20 teeth or more. Those aged 70 years and above showed the highest risk of falls (p=0.001) in comparison with the subjects aged between 60 and 69 years. Subjects with depression (p=0.03) and presence of illness related to fall showed statistically significant difference (p=0.001) in comparison with those who did not suffer from the same. Compromised ADL (p=0.001) (which included ability to perform several tasks like indoor mobility, climbing stairs, toilet use, and feeding) and low monthly income (p=0.03) was also observed among subjects who had higher risk of falls.
Conclusion: According to the results achieved, there was a high statistically significant association observed between the number of teeth present, age, depression, ADL, and presence of illness in relation to the risk of falling among the geriatric population. Henceforth, oral rehabilitation of elderly patients with less number of teeth may reduce their risk of falls.

Matched MeSH terms: Mastication
Muscle spindles provide servo-assistance to jaw-closing muscles for chewing hard foods

Zakir H, Fathilah A, Bakri M, Kitagawa J

Sains Malaysiana, 2015;44:593-597.

The fundamental pattern of chewing induced by the network of neurons called central pattern generator has been reported
to be modified by the information arising from the various oro-facial sensory receptors including muscle spindles of jaw
closing muscles. The cell bodies of primary afferent neurons from these muscle spindles lie in mesencephalic trigeminal
nucleus (MTN) in the brainstem. The aim of the study was to understand whether muscle spindles from jaw-closing
muscles play any role in hard food chewing. Single neuronal discharge of muscle spindle afferents was recorded from the
MTN simultaneous with jaw-movement and electromyograpic (EMG) activities of the left masseter (jaw-closing) muscle
during chewing soft and hard foods (apple and pellet) in awake rabbits. Ten consecutive chewing cycles were taken for
analysis. Discharge of nineteen muscle spindles from seven rabbits was successfully recorded. Muscle-spindle discharge
was significantly higher during the closing phase of jaw-movement for the hard food chewing than for the soft food. The
jaw-closing muscle EMG activity was significantly higher during hard food chewing compared to soft food. The spindle
discharge was higher when the masseter muscle activity was greater for chewing hard food. Significant positive (r=0.822,
p=<0.001) correlation was found between the difference of muscle activity between apple and pellet and the difference
of spindle discharge between apple and pellet. Above findings suggest that the increase of spindle discharge during
hard food chewing may play a role for facilitating jaw-closing muscle activities and thereby provides servo-assistance
to jaw-closing muscles to compensate the hardness of food.

Matched MeSH terms: Mastication
Assessment of masticatory function of mandibular implant-supported overdenture wearers: A 3-year prospective study

Khalid T, Yunus N, Ibrahim N, Saleh NBM, Goode D, Masood M

J Prosthet Dent, 2020 Dec;124(6):674-681.
PMID: 31952858 DOI: 10.1016/j.prosdent.2019.08.005

STATEMENT OF PROBLEM: Wearers of mandibular complete dentures (CDs) often complain of retention and stability problems resulting in poor masticatory function. Evidence suggests that a mandibular overdenture (MOD) stabilized by 2 implants represents the treatment of choice to improve stability and masticatory function. Measurements are needed of the improvement in masticatory function after providing mandibular implant-stabilized overdentures.
PURPOSE: The purpose of this prospective clinical study was to evaluate the changes in masticatory function from baseline (T0) to 3 months (T1) and 3 years (T2) in participants with MODs and to assess the effect of baseline mandibular bone height and volume on masticatory function after 3 years.
MATERIAL AND METHODS: Participants were assessed for masticatory function by using masticatory performance involving paraffin wax cubes as an objective measure and by using masticatory ability involving a questionnaire as a subjective measure. Edentulous individuals presenting for replacement dentures were provided with conventional mucosa-supported prostheses and evaluated for masticatory function after a 3-month settling-in period (baseline measure). Before implant placement, baseline measures of bone height and volume were recorded from cone beam computed tomography (CBCT) images. The prostheses were then converted to implant-stabilized mandibular overdentures while any maxillary prostheses remained supported by the mucosa. Masticatory function was reassessed at 3 months and 3 years after insertion of the mandibular overdentures, and the mean changes from baseline were analyzed with the Wilcoxon signed-rank test. The effect of variables on masticatory function was determined by using multivariate linear regression analyses.
RESULTS: A total of 23 participants were included in the study, with only 1 participant not completing the 3-year assessment. Significant improvement was observed in the masticatory performance (mixing ability index) (P

Matched MeSH terms: Mastication
Assessment of masticatory performance by geometric measurement of the mixing ability with 2-color chewing gum

Yousof Y, Salleh NM, Yusof F

J Prosthet Dent, 2019 Jun;121(6):916-921.
PMID: 30745100 DOI: 10.1016/j.prosdent.2018.09.005

STATEMENT OF PROBLEM: The 2-color mixing ability test has been recently introduced for objective assessment of masticatory performance. However, the ideal bicolor specimens have not yet been identified, and the color analysis of digital images requires improvement.
PURPOSE: The purpose of this clinical study was to formulate a custom-made, 2-color chewing gum for the mixing ability test and to develop an image-processing method for color mixing analysis.
MATERIAL AND METHODS: Specimens of red-green (RG) chewing gum were prepared as a test food. Twenty dentate participants (10 men, 10 women; mean age 21 years) took part in this study. Each participant masticated 1 piece of RG gum for 3, 6, 9, 15, and 25 cycles, and this task was repeated 3 times consecutively (total n=15 for each participant). The boluses were retrieved and flattened to 1-mm-thick wafers and scanned with a flatbed scanner. The digital images were analyzed using ImageJ software equipped with a custom-built plug-in to measure the geometric dispersion (GD) of baseline red segment. The predictive criterion validity of this method was determined by correlating GD to the number of mastication cycles. The hardness and mass of RG chewing gum were measured before and after mastication. Hardness loss (%) and mass loss (%) were then calculated and compared with those of a commercially available chewing gum.
RESULTS: The 2-way repeated-measures ANOVA with post hoc Bonferroni test showed that GD was able to discriminate among the groups of different numbers of mastication cycles (P

Matched MeSH terms: Mastication
Fulltext A review of epidemiological studies of oral cancer and precancer in Malaysia

Zain, R.B., Ghazali, N.

Ann Dent, 2001;8(1):-.
MyJurnal

This paper attempts to review epidemiological studies of oral cancer and precancer in Malaysia. The defmitions of prevalence, incidence, risk habits and oral cancer and precancers were discussed to better understand' the different types of studies conducted, which would be important in making comparisons between studies. Currently, epidemiological data on oral cancer in Malaysia are sketchy. The only incidence data for oral cancer in Malaysia was reported by Hirayama in 1966, 35 years ago. He estimated that 3.1 new cases per 100,000 population were diagnosed for the year 1963. A number of histopathological data of oral and maxillofacial biopsies were reported. Oral cancer accounted for one-fifth of all oral biopsies. A national study on oral mucosal lesions in Malaysia carried out in 1993/4 reported that there was a variation seen in the occurrence of oral premalignancy among the ethnic groups. The Indians and the indigenous people of Sabah and Sarawak were identified as high risk groups for oral cancer and precancer. It was also observed that both of the ethnic groups chewed betel quid. In conclusion, the epidemiological studies have provided useful data, which may be used in planning for future oral health programmes and research towards enhancing Malaysia's on-going effort in preventing the occurrence of these diseases.

Matched MeSH terms: Mastication
Knowledge, perceptions and clinical application of the shortened dental arch concept among Malaysian government dentists

Kasim SKM, Razak IA, Yusof ZYM

Int Dent J, 2018 Feb;68(1):31-38.
PMID: 28782099 DOI: 10.1111/idj.12325

AIM: To assess the knowledge and perceptions of Malaysian government dentists regarding the shortened dental arch (SDA) concept and its application in clinical practice.
BACKGROUND: The SDA concept refers to a specific type of dentition with intact anterior teeth and a reduction in posterior occlusal pairs. Dentists' knowledge and perceptions of the SDA concept can influence its application in clinical practice.
METHODS: A self-administered questionnaire on the SDA concept was distributed to 326 government dentists in the states of Selangor and Kuala Lumpur, Malaysia. The data were analysed using SPSS version 22 software.
RESULTS: The response rate was 84.0%. The majority of respondents had good knowledge on five of six knowledge items and good attitudes towards 10 of 17 perception items. However, only one-fifth (20.4%) reported having applied the SDA concept in the clinic. A larger number of participants who graduated locally than who graduated abroad perceived that patients <60 years of age, without molar support, can attain acceptable chewing function and that SDA treatment does not lead to loss of occlusal vertical dimension (P < 0.05). A larger number of participants with ≤5 years of work experience than with >5 years of work experience perceived that the SDA concept enables simpler treatment planning (P < 0.05). Finally, a larger number of participants who graduated abroad than who graduated locally observed that patients without molar support had temporomandibular joint problems (P < 0.05).
CONCLUSION: Although Malaysian government dentists have good knowledge and perceptions of the SDA concept, it is not widely applied in the clinic. Concerted efforts in SDA training of dentists are needed to help to shorten denture waiting lists and reduce costs.

Matched MeSH terms: Mastication

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