Displaying publications 41 - 60 of 62 in total

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  1. Automated measurement for image distortion analysis in 2D panoramic imaging of dental CBCT system: A phantom study
    Rabba JA, Suhaimi FM, Mat Jafri MZ, Jaafar HA, Osman ND
    Radiography (Lond), 2023 May;29(3):533-538.
    PMID: 36913788 DOI: 10.1016/j.radi.2023.02.028
    INTRODUCTION: The daily image quality assessment involves large datasets that consume a lot of time and effort. This study aims to evaluate a proposed automated calculator for image distortion analysis in 2-dimensional (2D) panoramic imaging mode for a dental cone beam computed tomography (CBCT) system in comparison with present manual calculations.

    METHODS: A ball phantom was scanned using panoramic mode of the Planmeca ProMax 3D Mid CBCT unit (Planmeca, Helsinki, Finland) with standard exposure settings used in clinical practice (60 kV, 2 mA, and maximum FOV). An automated calculator algorithm was developed in MATLAB platform. Two parameters associated with panoramic image distortion such as balls diameter and distance between middle and tenth balls were measured. These automated measurements were compared with manual measurement using the Planmeca Romexis and ImageJ software.

    RESULTS: The findings showed smaller deviation in distance difference measurements by proposed automated calculator (ranged 3.83 mm) as compared to manual measurements (ranged 5.00 for Romexis and 5.12 mm for ImageJ software). There was a significant difference (p 

    Matched MeSH terms: Radiography, Panoramic
  2. Prevalence and patterns of tooth agenesis among Malay children
    Mani SA, Mohsin WS, John J
    Southeast Asian J Trop Med Public Health, 2014 Mar;45(2):490-8.
    PMID: 24968691
    Tooth agenesis in Malay children, hitherto unreported, was assessed retrospectively from orthopantomograms of 834 healthy children aged 12-16 years who attended the Dental Clinic of Universiti Sains Malaysia. All teeth, including third molars, were assessed for agenesis. On an average, 2.3 teeth were missing per child. Missing third molars were found in 25.7% of children with one or two third molars found to be missing in 18.3% of children. Three point two percent of children had missing teeth other than third molars. After third molars, the upper lateral incisors were found to be the most common missing tooth (1.7%), followed by upper and lower second premolars (1.5%). Eight missing upper canines were also seen (1%). Bilateral agenesis was more common than unilateral agenesis. There were no significant differences between males and females. There was a significant difference between missing teeth between the maxilla and the mandible and right and left side, with more missing teeth in the maxilla and on the right side. The odds of any 3rd molar missing were increased 3.3 times when there was any other missing tooth. In conclusion, the prevalence of tooth agenesis among the studied population was within the normal range, but less than some Asian countries. Unlike other Asian countries, the upper lateral incisor was the most common missing tooth. The prevalence of maxillary canine agenesis was higher than most previous reports. Missing teeth were associated with missing third molars, which is likely due to a genetic abnormality.
    Matched MeSH terms: Radiography, Panoramic
  3. Comparison of dental maturation in Hong Kong Chinese and United Kingdom Caucasian populations
    Jayaraman J, Roberts GJ
    Forensic Sci Int, 2018 Nov;292:61-70.
    PMID: 30269046 DOI: 10.1016/j.forsciint.2018.09.005
    Understanding dental maturation in ethnically distinct populations is important in forensic age estimations and the presence of population differences in dental maturation was highly debated. No such comparison had been performed between two major populations; Caucasian and Chinese. This study aims to analyze and compare the maturation of permanent teeth from a sample of Caucasian and Chinese populations. Dental panoramic radiographs of subjects aged 2-24years belonging to United Kingdom (UK) Caucasian and Hong Kong (HK) Chinese populations were obtained from a teaching hospital. The teeth were scored and reference datasets were developed separately for males and females. Statistical significance was set at p<0.05 and independent sample t-test was conducted between the average ages at assessment for each stage of development for all the teeth in both groups. The HK Chinese were dentally advanced than the UK Caucasians by an average of 5 months, however, reverse trend was observed in third molars (p<0.05). These findings must be considered whilst utilising population specific reference dataset for dental age estimation.
    Matched MeSH terms: Radiography, Panoramic*
  4. The correlation between crestal bone resorption and implant stability during healing period using resonance frequency analysis
    Al-Juboori MJ, AbdulRahaman SB, Hassan A
    Implant Dent, 2013 Aug;22(4):351-5.
    PMID: 23811720 DOI: 10.1097/ID.0b013e318296583d
    To detect the correlation between crestal bone resorption and implant stability during healing period using resonance frequency analysis (RFA).
    Matched MeSH terms: Radiography, Panoramic/methods
  5. The variability of lower third molar development in Northeast Malaysian population with application to age estimation
    Johan NA, Khamis MF, Abdul Jamal NS, Ahmad B, Mahanani ES
    J Forensic Odontostomatol, 2012 Jul;30(1):45-54.
    PMID: 23000811
    This study aimed to assess the variability of the lower third molar (tooth 38 and 48) development in Northeast Malaysian population with respect to the side of dentition, to generate age prediction models and to compare the outcome with other studies. A total of 1080 orthopantomograms of Northeast Malaysian population aged between 14 and 25 years (540 males and 540 females) from the Hospital Universiti Sains Malaysia's archive which met the inclusion and exclusion criteria were selected and the maturity stages of tooth 38 and 48 were scored using Demirjian's stages (A-H). The findings showed a wide variation of the development of lower third molars in the Northeast Malaysian population. The roots developed earlier in males than in females. The development of the dentition on opposite sides of the mandible was synchronously in females and males. A multiple regression analysis shows that 71.1% of variance in age was explained by sex and developmental stage of tooth 48. An age prediction model was generated from the regression analysis: [Age = 7.117 + 1.907*(stage of tooth 48) - 0.432*(sex)] with mean prediction errors between -0.17 to 3.14 years. The obtained data in the current study are useful for references and determining age of unidentified human remains for identification investigation.
    Matched MeSH terms: Radiography, Panoramic
  6. The safety zone for mini-implant maxillary anchorage in Mongoloids
    Wey MC, Shim CN, Lee MY, Jamaluddin M, Ngeow WC
    Aust Orthod J, 2012 May;28(1):17-21.
    PMID: 22866589
    This study aimed to establish a safety zone for the placement of mini-implants in the buccal surface between the second maxillary premolar (PM2) and first maxillary molar (M1) of Mongoloids.
    Matched MeSH terms: Radiography, Panoramic
  7. Validity of Demirjian and Willems methods for dental age estimation for Malaysian children aged 5-15 years old
    Nik-Hussein NN, Kee KM, Gan P
    Forensic Sci Int, 2011 Jan 30;204(1-3):208.e1-6.
    PMID: 20869825 DOI: 10.1016/j.forsciint.2010.08.020
    BACKGROUND: One of the most commonly used method for dental age assessment is the method reported by Demirjian and coworkers in 1973. It was later modified by Willems and coworkers whereby they “performed a weighted ANOVA” in order to adapt the scoring system.
    AIM: To evaluate the applicability of Demirjian and Willems methods for dental age estimation for Malaysian children and to correlate the accuracy of the findings with the chronology of tooth development of premolars and second molars.
    MATERIALS AND METHODS: A total of 991 dental panoramic radiographs of 5-15-year-old Malaysian children were included in the study. The mean Demirjian and Willems estimated ages were compared to the mean chronological age.
    RESULTS: The mean chronological age of the sample was 10.1±2.8 and 9.9±3.0 years for males and females respectively. Using the Demirjian method, the mean estimated dental age was 10.8±2.9 years for males and 10.5±2.9 years for females. For Willems method, the mean estimated age was 10.3±2.8 years males and 10.0±3.0 years respectively.
    CONCLUSIONS: Willems method was more applicable for estimating dental age for Malaysian children. Overestimation in Demirjian method could be due to advanced development of second bicuspids and molars.
    Matched MeSH terms: Radiography, Panoramic
  8. A radiographic study on the visualization of the anterior loop in dentate subjects of different age groups
    Ngeow WC, Dionysius DD, Ishak H, Nambiar P
    J Oral Sci, 2009 Jun;51(2):231-7.
    PMID: 19550091
    The anterior loop is defined as where the mental neurovascular bundle crosses anterior to the mental foramen then doubles back to exit the mental foramen. It cannot be seen clinically but can be detected in 11-60% of panoramic radiographs. As this anatomical structure is important in determining the placement position of endosseous implants in the mandibular premolar region, a pilot study was undertaken to determine its visibility on dental panoramic radiographs in dentate subjects of various age groups. One or more anterior loops were visible in 39 (40.2%) radiographs encompassing 66 sites (34.4%). Interestingly, anterior loops were most commonly observed bilaterally, followed by on the right side of the mandible only. An anterior loop on the left side only was observed in just 1 radiograph. Visibility of anterior loops reduced as the age of subjects increased. More than half (58.1%) of subjects aged 20-29 years exhibited at least one anterior loop; this gradually reduced to only 15 percent of subjects aged 50 and older. There was no association between visualization of the anterior loop and subject gender.
    Matched MeSH terms: Radiography, Panoramic
  9. Comparison of two methods of dental age estimation in 7-15-year-old Malays
    Mani SA, Naing L, John J, Samsudin AR
    Int J Paediatr Dent, 2008 Sep;18(5):380-8.
    PMID: 18284472 DOI: 10.1111/j.1365-263X.2007.00890.x
    BACKGROUND: Numerous methods of age estimation have been proposed. The Demirjian method is the most frequently used, which was first applied in a French Canadian population in 1973. The Willems method is a modification of the above and was applied in a Belgian population in 2002.
    OBJECTIVES: The objectives of this study were to test the applicability of the two methods, namely Demirjian and Willems, for age estimation in a Malay population, and to find the correlation between body mass index and the difference between the dental age and the chronological age.
    MATERIALS AND METHODS: A cross-sectional study involving 214 boys and 214 girls, selected by a simple stratified random sampling method was carried out. The orthopantomograph was used to score the seven left mandibular teeth, and the calculated maturity score was used to obtain the Demirjian dental age. Willems dental age was estimated using the tables proposed in the Willems method. Results. The Demirjian method overestimated the age by 0.75 and 0.61 years, while the Willems method overestimated the age by 0.55 and 0.41 years among boys and girls, respectively. In boys, the body mass index was significantly correlated to the difference in age using the Willems method.
    CONCLUSION: Further modification of either method is indicated for dental age estimation among the Malay population.
    Matched MeSH terms: Radiography, Panoramic
  10. Application of third molar development and eruption models in estimating dental age in Malay sub-adults
    Mohd Yusof MY, Cauwels R, Deschepper E, Martens L
    J Forensic Leg Med, 2015 Aug;34:40-4.
    PMID: 26165657 DOI: 10.1016/j.jflm.2015.05.004
    The third molar development (TMD) has been widely utilized as one of the radiographic method for dental age estimation. By using the same radiograph of the same individual, third molar eruption (TME) information can be incorporated to the TMD regression model. This study aims to evaluate the performance of dental age estimation in individual method models and the combined model (TMD and TME) based on the classic regressions of multiple linear and principal component analysis. A sample of 705 digital panoramic radiographs of Malay sub-adults aged between 14.1 and 23.8 years was collected. The techniques described by Gleiser and Hunt (modified by Kohler) and Olze were employed to stage the TMD and TME, respectively. The data was divided to develop three respective models based on the two regressions of multiple linear and principal component analysis. The trained models were then validated on the test sample and the accuracy of age prediction was compared between each model. The coefficient of determination (R²) and root mean square error (RMSE) were calculated. In both genders, adjusted R² yielded an increment in the linear regressions of combined model as compared to the individual models. The overall decrease in RMSE was detected in combined model as compared to TMD (0.03-0.06) and TME (0.2-0.8). In principal component regression, low value of adjusted R(2) and high RMSE except in male were exhibited in combined model. Dental age estimation is better predicted using combined model in multiple linear regression models.
    Matched MeSH terms: Radiography, Panoramic
  11. Above or below 14 years? An orthopantomographic study based on chronological course of eruption of mandibular premolars and second molars in a sample of south Indian children
    Thomas LA, Thomas LR, Balla SB, Gopalaiah H, Kanaparthi A, Sai Sravanthi G, et al.
    Leg Med (Tokyo), 2021 Feb;48:101814.
    PMID: 33246253 DOI: 10.1016/j.legalmed.2020.101814
    In the context of dental age assessment, two significant factors can be studied; tooth mineralisation and tooth emergence. Little is known about the role of a second molar eruption in forensic age estimation. This paper aims to contribute to forensic age estimation using an age threshold of 14 years, studying the eruption stages of permanent mandibular premolars and second molars. Totally 640 orthopantomograms (OPGs) of south Indian children, aged between 10 and 18 years, were evaluated using Olze et al. staging of tooth eruption stages (A-D). Spearman's rho correlation showed a strong, positive, and statistically significant correlation between the chronological age and the eruption stages of both sexes' teeth. Accuracy, sensitivity, specificity, likelihood ratios, and post-test probability values were calculated for all tested teeth. The best performance to discriminate individuals above or below 14 years showed stage D in second molars. The sensitivity varied between 89% and 94% and specificity between 75% and 84%, respectively. Receiver operating characteristic curve analysis revealed high diagnostic performance for stage D, with area under the ROC curve (AUC) values of 84% and 85% for tooth 37 and 85% and 83% for tooth 47 in males and females, respectively. In conclusion, it is possible to predict age over 14 years in south Indian children using tooth emergence stages from OPGs with a relatively high interobserver agreement and good diagnostic accuracy. However, there are some limitations and, therefore, must be used in conjunction with other methods.
    Matched MeSH terms: Radiography, Panoramic
  12. Fulltext Prevalence of Third Molar Agenesis: Associated Dental Anomalies in Non-Syndromic 5923 Patients
    Sujon MK, Alam MK, Rahman SA
    PLoS One, 2016;11(8):e0162070.
    PMID: 27580050 DOI: 10.1371/journal.pone.0162070
    The aim of this study was to investigate the prevalence of third molar agenesis and other associated dental anomalies in Bangladeshi population and to investigate the relationship of other dental anomalies with the third molar presence/agenesis. A retrospective study was performed using panoramic radiographs of 5923 patients, who ranged in age from 10 to 50 years. All radiographs were analyzed by Planmeca Romexis® 3.0 software (Planmeca Oy, Helsinki, Finland). Pearson chi-square and one way ANOVA (Post Hoc) test were conducted. The prevalence of third molar agenesis was 38.4%. The frequency of third molar agenesis was significantly higher in females than males (p <0.025). Third molar agenesis was significantly more prevalent in maxilla as compared to mandible (p <0.007). The prevalence of other dental anomalies was 6.5%, among them hypodontia was 3.1%. Prevalence of third molar agenesis varies in different geographic region. Among the other dental anomalies hypodontia was more prevalent.
    Matched MeSH terms: Radiography, Panoramic
  13. Development of a Reference Data Set (RDS) for dental age estimation (DAE) and testing of this with a separate Validation Set (VS) in a southern Chinese population
    Jayaraman J, Wong HM, King NM, Roberts GJ
    J Forensic Leg Med, 2016 Oct;43:26-33.
    PMID: 27441983 DOI: 10.1016/j.jflm.2016.07.007
    BACKGROUND: Many countries have recently experienced a rapid increase in the demand for forensic age estimates of unaccompanied minors. Hong Kong is a major tourist and business center where there has been an increase in the number of people intercepted with false travel documents. An accurate estimation of age is only possible when a dataset for age estimation that has been derived from the corresponding ethnic population. Thus, the aim of this study was to develop and validate a Reference Data Set (RDS) for dental age estimation for southern Chinese.

    MATERIALS AND METHODS: A total of 2306 subjects were selected from the patient archives of a large dental hospital and the chronological age for each subject was recorded. This age was assigned to each specific stage of dental development for each tooth to create a RDS. To validate this RDS, a further 484 subjects were randomly chosen from the patient archives and their dental age was assessed based on the scores from the RDS. Dental age was estimated using meta-analysis command corresponding to random effects statistical model. Chronological age (CA) and Dental Age (DA) were compared using the paired t-test.

    RESULTS: The overall difference between the chronological and dental age (CA-DA) was 0.05 years (2.6 weeks) for males and 0.03 years (1.6 weeks) for females. The paired t-test indicated that there was no statistically significant difference between the chronological and dental age (p > 0.05).

    CONCLUSION: The validated southern Chinese reference dataset based on dental maturation accurately estimated the chronological age.

    Matched MeSH terms: Radiography, Panoramic
  14. Factors Associated with Apical Periodontitis: A Multilevel Analysis
    Hussein FE, Liew AK, Ramlee RA, Abdullah D, Chong BS
    J Endod, 2016 Oct;42(10):1441-5.
    PMID: 27552839 DOI: 10.1016/j.joen.2016.07.009
    INTRODUCTION: Ignoring the cluster effect is a common statistical oversight that is also observed in endodontic research. The aim of this study was to explore the use of multilevel modeling in investigating the effect of tooth-level and patient-level factors on apical periodontitis (AP).

    METHODS: A random sample of digital panoramic radiographs from the database of a dental hospital was evaluated. Two calibrated examiners (κ ≥ 0.89) assessed the technical quality of the root fillings and the radiographic periapical health status by using the periapical index. Descriptive statistical analysis was carried out, followed by multilevel modeling by using tooth-level and patient-level predictors. Model fit information was obtained, and the findings of the best-fit model were reported.

    RESULTS: A total of 6409 teeth were included in the analysis. The predicted probability of a tooth having AP was 0.42%. There was a statistically significant variability between patients (P 

    Matched MeSH terms: Radiography, Panoramic
  15. Fulltext Root-crown ratios of permanent teeth in Malay patients attending HUSM Dental Clinic
    Norisa Othman, Haslina Taib, Norehan Mokhtar
    Archives of Orofacial Sciences, 2011;6(1):21-26.
    MyJurnal
    The objectives of this study were to determine the normal mean value of the root-crown (R/C ratios) in Malay patients and their variations by gender and dental arch from orthopantomogram radiographs (OPGs). Two thousand nine hundred and twenty teeth with fully developed roots were measured from 112 OPGs. Subjects with history of maxillofacial trauma or orthodontic therapy were excluded. The mean age of the subjects was 19.1 (SD 2.08) years old for males while females 18.9 (SD 2.19) years old in the range from 15 to 22 years old. The intra-examiner reproducibility of the assessment method was good (Intraclass correlation coefficient 0.81). Results of this study showed that there was no significant difference between R/C ratios of males and females groups. However, the ratios of the antagonist teeth for both males and females were significantly greater in the mandible than in the maxilla (p

    Study site: Dental clinic, Hospital Universiti Sains Malaysia
    Matched MeSH terms: Radiography, Panoramic
  16. Fulltext Florid cemento-osseous dysplasia as a possible aggravating factor in a case of trigeminal neuralgia.
    Siar, C.H., Ibrahim, N., Omar, A.N., Abdul Rahman, Z.A.
    Ann Dent, 2010;17(1):21-24.
    MyJurnal
    Differential diagnosis of orofacial pain is crucial, as the course of each process and its clinical management varies markedly. A case is illustrated here of trigeminal neuralgia in a 49-year-old Indian female whose complaint was initially diagnosed as dental pain leading to sequential extractions of her right mandibular and maxillary molars but with no pain abatement. Subsequent neurological assessment diagnosed her complaint as trigeminal neuralgia but pain remained poorly controlled even with high doses of carbamazepine and gabapentin. A dental referral and orthopantomographic examination revealed multifocal sclerotic masses in her jaws, suggestive of florid cemento-osseous dysplasia (FCOD). Right mandibular incisional biopsy confirmed the diagnosis. A decision was made to curette the right mandibular masses and lateralised the right inferior dental nerve. Follow-up disclosed considerable pain reduction. This case raises the issue as to whether the sclerotic bone masses in FCOD may have caused nerve compression which
    aggravated her neuralgic pain.
    Matched MeSH terms: Radiography, Panoramic
  17. Fulltext Numb chin syndrome: an ominous sign of mandibular metastasis
    Razak A, Goh BS, Rajaran JR, Nazimi AJ
    BMJ Case Rep, 2018 May 14;2018.
    PMID: 29764822 DOI: 10.1136/bcr-2017-223586
    A 51-year-old woman a known case of stage 2 breast carcinoma in 2006 and underwent left mastectomy performed in the same year presented with bilateral lower limb pain suggestive of spinal pathology, and left chin numbness, both of 2 weeks' duration. Examination revealed left mandibular hypoesthesia without any other sign or symptoms. Orthopantomogram was unremarkable apart from mild alveolar bone expansion at tooth 36 area, which was extracted 3 months earlier. Subsequently, a full-body positron emission tomography contrast enhanced computer tomography revealed hypermetabolic lesions of her axial (excluding skull) and appendicular skeleton. In the head and neck region, left mandibular foramen and oropharynx bilaterally showed increased metabolism suggestive of tumour metastasis. The diagnosis was numb chin syndrome secondary to mandibular metastasis. Apart from supportive treatment, she was started on palliative chemotherapy and radiotherapy. At the time of discharge, there were no active complaints other than the aforementioned hypoesthesia.
    Matched MeSH terms: Radiography, Panoramic
  18. Validation of Cameriere's third molar maturity index alone and in combination with apical maturity of permanent mandibular second molar for indicating legal age of 14 years in a sample of South Indian children
    Balla SB, Banda TR, Galic I, N NM, Naishadham PP
    Forensic Sci Int, 2019 Apr;297:243-248.
    PMID: 30844636 DOI: 10.1016/j.forsciint.2019.02.009
    The aims of the present study were to validate the discriminatory potential of Cameriere's third molar maturity index (I3M) cut-off value of I3M 
    Matched MeSH terms: Radiography, Panoramic
  19. Comparison of the third molar maturity index (I3M) between left and right lower third molars to assess the age of majority: a multi-ethnic study sample
    Angelakopoulos N, Galić I, Balla SB, Kiş HC, Gómez Jiménez L, Zolotenkova G, et al.
    Int J Legal Med, 2021 Nov;135(6):2423-2436.
    PMID: 34228192 DOI: 10.1007/s00414-021-02656-2
    The diagnostic accuracy of the I3M to assess the legal age of 18 years has already been tested in several specific-population samples. The left lower third molar has been extensively used for discriminating between minors and adults. This research aimed to compare the usefulness of lower third molar maturity indexes, from both left and right side (I3ML and I3MR), in samples originating from four distinct continents in order to examine possible differences in their accuracy values. For this purpose, a sample of 10,181 orthopantomograms (OPGs), from Europe, Africa, Asia and America, was analysed and previously scored in other studies. The samples included healthy subjects with no systemic disorders with both third molars and clear depicted root apices. Wilcoxon Signed Rank test for left and right asymmetry did not show any significant differences. Data about sensitivity, specificity, predictive values, likelihood ratio and accuracy were pooled together and showed similar results for I3ML and I3MR, respectively. In addition, all these quantities were high when only the I3MR was considered to discriminate between adults and minors. The present referable database was the first to pool third molar measurements using panoramic radiographs of subjects coming from different continents. The results highlighted that both I3ML and I3MR are reliable indicators for assessing the legal age of 18 years old in those jurisdictions where this legal threshold has been set as the age of majority.
    Matched MeSH terms: Radiography, Panoramic
  20. Age-related changes in the location of the mandibular and mental foramen in children with Mongoloid skeletal pattern
    Lim MY, Lim WW, Rajan S, Nambiar P, Ngeow WC
    Eur Arch Paediatr Dent, 2015 Oct;16(5):397-407.
    PMID: 25894248 DOI: 10.1007/s40368-015-0184-x
    To observe age-related changes in the locations of mandibular foramen (MF) and mental foramen (mf) using dental panoramic tomographs (DPTs).
    Matched MeSH terms: Radiography, Panoramic/methods
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