MyMedR

A comparative study of evolutionary trends in the upper molar pattern of recent Kodiak Island inhabitants and subrecent Javanese Malayans

Korenhof CA

J Dent Res, 1966 Nov-Dec;45(6):1687-95.

PMID: 5226535

Matched MeSH terms: Molar/anatomy & histology*

Sensitivity enhancement of urea biosensor based on surface plasmon resonance and kretschmann configuration with graphene-mos2 hybrid structure

Nur Akmar Jamil, Gan SM, Burhanuddin Yeop Majlis, Susthitha Menon P

Sains Malaysiana, 2018;47:1033-1038.

Artikel ini menganalisis biosensor resonans plasmon permukaan (SPR) dengan lapisan grafin yang meningkatkan
kecekapan biosensor urea kerana penerapannya yang tinggi. Tatasusunan Kretschmann merupakan teknik yang paling
berkesan digunakan untuk pengujaan plasmon. Dalam kajian ini, kami menganalisis kesan ekalapisan MoS2 dengan
lapisan grafin yang didepositkan pada bahan plasmon, iaitu logam emas (Au), di dalam tatasusunan ini. Simulasi untuk
menganalisis tatasusunan ini adalah berdasarkan kepada kaedah perbezaan terhingga domain masa (FDTD). Prestasi
biosensor SPR dapat dipantau dengan menganalisis kepekaan dan lebar penuh pada separuh maksimum (FWHM) spektrum
SPR. Pengukuran diperhatikan pada panjang gelombang 670 nm dan 785 nm untuk pengesanan urea. Indeks molar dan
indeks biasan berbeza (RI) daripada 1.335 sehingga 1.342 untuk lapisan penderiaan. Keputusan menunjukkan peratus
peningkatan kepekaan biosensor Au/MoS2
/grafin berbanding biosensor Au konvensional adalah 98% dan 202% masingmasing
pada panjang gelombang 670 nm dan 785 nm. Ini menunjukkan bahawa cadangan biosensor SPR yang novel ini
adalah lebih sensitif untuk pengesanan urea.

Matched MeSH terms: Molar

Fulltext Transposed Supernumerary Premolar In Alignment - A Case Report

Ngeow, W.C.

Ann Dent, 1996;3(1):-.

MyJurnal

Supernumerarypremolars have been reported to occur in 0.29% of the general populationand to represent about 9.1% of all supernumerary teeth. Most of the supernumerary teeth reported in the literature were detected by radiographsas most of them were unerupted or impacted.Asearch of the literature revealed not many cases of fully erupted and well aligned supernumerary premolars being reported. A case of a unilateral transposed supernumery premolarthat had erupted into alignment is presented here. The remarkable featureof this case is that the supernumery premolar is transposed between the first and second permanent maxillary molars. The etiology of supernumeraryteeth is also reviewed.

Matched MeSH terms: Molar

Fulltext Scanning Electron Microscopic Examination of Root Canal Walls of Deciduous Molars with Necrotic Pulp

Rusmah, M.

Ann Dent, 1995;2(1):-.

MyJurnal

The root canal walls of twenty -five deciduous molar teeth with exposed and necrotic pulps were examined using thescanning electronmicroscope. Immediately after extraction, all teeth were fixed in Kamosky's solution. The coronal portion of the tooth was sectioned at about 2mm above the enamel cemental junction.The mesial and distal roots were separat~d and either split in the mesio-distal or bucco-lingual direction. All specimens were prepared for SEM. Obsevations showed that all roots were infected with organisms consisting of cocciand short rods. Some of the coccihad penetrated the dentine layer. However, the distribution of organisms is. not uniform throughout thecanals. Bacterialinvasion ismostinthecoronal region and reduces towards the apical region: Accompanying bacterial invasion is root canal walls deterioration. The odontoblastic processes are the first to deteriorate followed by the predentine layer.

Matched MeSH terms: Molar

Fulltext An exploratory study of human teeth enamel by using FT-Raman spectroscopy

Afishah Alias, Siti Rahayu Mohd Hashim, Wajir, Julynnie, Fauziah Abdul Aziz, Mihaly, Judith

Journal of Nuclear and Related Technologies, 2009;2009(1):141-146.

MyJurnal

Unaffected, affected and heavily affected teeth enamel were studied by using FT-Raman spectroscopy. The 14 permanent teeth’s enamel surface were measured randomly, resulting in total n=43 FT-Raman spectra. The results obtained from FT-Raman spectra of heavily affected, affected and unaffected tooth’s enamel surfaces did not show any significant difference. In this study, Kruskal-Wallis and Wilcoxon rank sum tests were used to compare the intensity between the categories of enamel as well as the surfaces of teeth samples.

Matched MeSH terms: Molar

A study on the spectroscopic, energy band, and optoelectronic properties of α,ω-dihexylsexithiophene/tris(8-hydroxyquinolinate) gallium blends; DH6T/Gaq3 composite system

Muhammad FF, Yahya MY, Ketuly KA, Muhammad AJ, Sulaiman K

Spectrochim Acta A Mol Biomol Spectrosc, 2016 Dec 05;169:144-51.

PMID: 27372510 DOI: 10.1016/j.saa.2016.06.031

In this work the optical response, spectroscopic behaviour, and optoelectronic properties of solution and solid state composite systems based on α,ω-dihexylsexithiophene/tris(8-hydroxyquinolinate) gallium (DH6T/Gaq3) are studied upon the incorporation of different molar percentages of Gaq3. UV-vis, PL, FTIR spectrophotometers and SEM technique were utilized to perform the investigations. The results showed a reduced energy band (Eg) (from 2.33eV to 1.83eV) and a broadened absorption spectrum for the blend system when 29.8% molar of Gaq3 was incorporated. These were attributed to the enhanced intermolecular interactions that are brought about by the increased strength of π-π overlap between the molecular moieties. A mathematical formula was developed to interpret the non-monotonic change occurred in Eg, while numerical calculations have been made to assign the type and nature of the electronic transitions governing the spectroscopic behaviour of the system. The results were elaborated and comprehensively discussed in terms of the exciton generation, energy band theory, molecular interactions, and spatial geometry.

Matched MeSH terms: Molar

In reply

Lim D, Ngeow WC

J Oral Maxillofac Surg, 2018 06;76(6):1141-1142.

PMID: 29596795 DOI: 10.1016/j.joms.2018.03.001

Matched MeSH terms: Molar, Third

Pre-eruptive intracoronal dentin defects of permanent teeth

Nik NN, Abul Rahman R

J Clin Pediatr Dent, 2003;27(4):371-5.

PMID: 12924738

This study was conducted to determine the prevalence of pre-eruptive intracoronal dentin defects from panoramic radiographs from a group of children and young adults aged 20 years and below. The radiolucent lesions were noted with regard to which teeth were affected, the location of the defects and the size of the defects relative to the width of dentin. Out of 1007 radiographs examined, 275 (27.3%) have pre-eruptive dentin defects. The prevalence of anomaly among males was 28.4% as compared to 26.2% among females. However, the difference between genders was not significant, thus subsequent results have been combined. Of 275 subjects with dentin radiolucencies, 243 subjects (88.7%) had only one affected tooth, 30 subjects (10.9%) had two teeth affected and 2 subjects (0.7%) had three affected teeth. The tooth prevalence of the anomaly was 2.1% and most of the lesions occurred as a single occurrence on the affected tooth. Within each tooth type, the highest tooth prevalence of intracoronal dentin defect was found in the upper first premolar (5.1%). More than half of the lesions extended less than 1/3 of the width of the dentin thickness. The high prevalence of the condition indicates the need for increased awareness and recognition of this during radiographic examination of teeth in the pediatric age group in early pre-eruptive stages so that early detection and diagnosis can be made and treatment can be done at the most appropriate time.

Matched MeSH terms: Molar/abnormalities; Molar/radiography; Molar, Third/abnormalities; Molar, Third/radiography

Fulltext Multivariate analysis of factors affecting presence and/or agenesis of third molar tooth

Alam MK, Hamza MA, Khafiz MA, Rahman SA, Shaari R, Hassan A

PLoS One, 2014;9(6):e101157.

PMID: 24967595 DOI: 10.1371/journal.pone.0101157

To investigate the presence and/or agenesis of third molar (M3) tooth germs in orthodontics patients in Malaysian Malay and Chinese population and evaluate the relationship between presence and/or agenesis of M3 with different skeletal malocclusion patterns and sagittal maxillomandibular jaw dimensions. Pretreatment records of 300 orthodontic patients (140 males and 160 females, 219 Malaysian Malay and 81 Chinese, average age was 16.27±4.59) were used. Third-molar agenesis was calculated with respect to race, genders, number of missing teeth, jaws, skeletal malocclusion patterns and sagittal maxillomandibular jaw dimensions. The Pearson chi-square test and ANOVA was performed to determine potential differences. Associations between various factors and M3 presence/agenesis groups were assessed using logistic regression analysis. The percentages of subjects with 1 or more M3 agenesis were 30%, 33% and 31% in the Malaysian Malay, Chinese and total population, respectively. Overall prevalence of M3 agenesis in male and female was equal (P>0.05). The frequency of the agenesis of M3s is greater in maxilla as well in the right side (P>0.05). The prevalence of M3 agenesis in those with a Class III and Class II malocclusion was relatively higher in Malaysian Malay and Malaysian Chinese population respectively. Using stepwise regression analyses, significant associations were found between Mx (P<0.05) and ANB (P<0.05) and M3 agenesis. This multivariate analysis suggested that Mx and ANB were significantly correlated with the M3 presence/agenesis.

Matched MeSH terms: Molar, Third/embryology*

Dens evaginatus on a wisdom tooth: a diagnostic dilemma. Case report

Ngeow WC, Chai WL

Aust Dent J, 1998 Oct;43(5):328-30.

PMID: 9848984

Pericoronitis is the most common odontogenic problem associated with the wisdom tooth in young men and women. Patients may present with problems associated with infection, swelling and pain. However, other associated pathology such as caries, periodontal disease and referred pain from the temporomandibular joint must be investigated when treating pain from the wisdom tooth. The authors wish to present a case in which the pain from a wisdom tooth was due to a fractured dens evaginatus. The importance of this dental anomaly should not be overlooked.

Matched MeSH terms: Molar, Third/abnormalities*

Fulltext The use of gutta-percha point to locate the origin of facial sinus

Ngeow WC

Med J Malaysia, 1997 Jun;52(2):181-2.

PMID: 10968080

Infection from the wisdom teeth usually causes severe swelling at the region of the angle and body of the mandible. Occasionally, it tracts outward to form a cervicofacial sinus. This paper demonstrates the use of gutta-percha point to locate the origin of a cervicofacial sinus due to an asymptomatic impacted wisdom tooth. The advantage of using gutta-percha point is discussed.

Matched MeSH terms: Molar, Third*

The incidence of the three-rooted lower first permanent molar in Malay people

Jones AW

Singapore Dent J, 1980 May;5(1):15-7.

PMID: 6935768

Matched MeSH terms: Molar/abnormalities*

Fulltext Late presentation of actinomycosis after third molar surgery

Boon LC

Med J Malaysia, 1987 Sep;42(3):207-8.

PMID: 3506647

A case of actinomycosis occurring four years after the surgical removal of an impacted lower third molar is presented. The need for careful wound debridement and the use of antibiotics as a prophylactic measure is emphasized.

Matched MeSH terms: Molar, Third/surgery*

The cracked tooth syndrome--crown root vertical fracture

Majid ZA, Zain RB

Singapore Dent J, 1988 Dec;13(1):44-6.

PMID: 3155005

A case of an incomplete tooth fracture followed by a complete fracture was presented. The difficulty of diagnosing this condition was discussed as well as the possible histological explanation of the symptoms experienced by the patient. It once again points out to practising dentists, that whilst deep pockets can give rise to severe periodontal pain, intense and excruciating pain should be investigated with the cracked tooth in mind.

Matched MeSH terms: Molar/injuries

Fulltext Teeth in osteogenesis imperfecta: a light microscopic study

Siar CH

Med J Malaysia, 1986 Jun;41(2):161-5.

PMID: 3821613

The light microscopic features of the dentine in three teeth from two cases of osteogenesis imperfecta (OJ) are presented. Results show that teeth in OJ distinctively have a more uniform and tubular mantle dentine, and a characteristic laminated circumpulpal dentine formed by distorted incremental bands alternating with parallel rows of interglobular dentine and interrupted by comet-shaped vascular canals. The study indicated that in the absence of overt OJ features, the changes in dentine alone are sufficiently characteristic to establish such a diagnosis.

Matched MeSH terms: Molar/pathology

The prevalence and distribution of enamel defects in 11-12 year old Malaysian schoolchildren

Nik-Hussein NN, Razak IA

Ann Acad Med Singap, 1989 Sep;18(5):591-3.

PMID: 2619248

The prevalence and symmetrical distribution of enamel defects were studied in 218 Malaysian school children aged 11-12 years old. The tooth prevalence of enamel defect was 40.3 per cent. The first permanent molars were the most severely affected, whereas the lower incisors were the least severely affected. Overall there was no sex difference. Distribution of symmetry was assessed between the right and left tooth pairs as well as for upper and lower teeth. A higher proportion of symmetry was observed for the right and left tooth pairs and the lingual surfaces showed a greater percentage of bilateral distribution.

Matched MeSH terms: Molar/pathology

Pattern of third molar impactions in north-eastern peninsular Malaysia: A 10-year retrospective study

Ahmad P, V'Vian T, Chaudhary FA, Chaudhary A, Haseeb AA, Yaqoob MA, et al.

Niger J Clin Pract, 2021 Jul;24(7):1028-1036.

PMID: 34290179 DOI: 10.4103/njcp.njcp_499_20

Background: Third molar impaction, if left untreated, has the potential to cause several complications. The evaluation of surgical difficulty of impacted third molar extraction aids in better formulation of treatment plan by minimizing surgical complications.

Objective: This study aimed to determine the prevalence of third molar impaction and related pathologic conditions in a cohort of patients living in North-eastern Peninsular Malaysia.

Methods: In this retrospective study, 490 orthopantomograms (OPGs) of patients who were referred to the Oral and Maxillofacial Surgery department between January 2010 and December 2019 were assessed. Data including age, gender, ethnicity, frequency of third molar impactions, their angulations and levels of eruption, retromolar space, and associated pathologic conditions were collected. Statistical analysis was performed using the Statistical Package for Social Sciences (SPSS) version 24.0. The significance level was set to P < 0.05.

Results: A total of 490 patients with a mean age of 28.87 years (range: 20-64) demonstrated 1957 impacted third molars (1022 mandibular + 935 maxillary). Impacted third molars were more likely present in females than males (1:2.20) (p < 0.05); and in Malay-ethnic (44.49%) patients followed by Chinese (34.45%) and Indians (21.02%). Mesioangular was the most common angulation of impaction both in the maxilla (24.68%) and mandible (18.34%). The most common pattern of third molar impaction was IIA (61.67%), and the retromolar space was significantly larger in males (13.6 mm; P < 0.05) than females (11.6 mm). The most frequently occurring pathological condition associated with third molars impaction is dental caries in the second or third molar (15.38%).

Conclusions: This study highlights mesioangular impaction with their occlusal plane at the same level as the occlusal plane of the adjacent tooth being the most prevalent pattern of third molar impaction in North-eastern Peninsular Malaysia.

Matched MeSH terms: Molar, Third/surgery

Fulltext Effects of lower third molar removal on attachment level and alveolar bone height of the adjacent second molar

Wong, Soo Yee, Roselinda Ab. Rahman, Haslina Taib

Archives of Orofacial Sciences, 2009;4(2):36-40.

MyJurnal

The purpose of this study was to evaluate the periodontal status distal to the adjacent second molar following the extraction of a partially or fully impacted mandibular third molar at Klinik Pergigian Pakar Hospital Universiti Sains Malaysia (KPPHUSM) from April of 2008 until June of 2008.This was a prospective study which involved the clinical and radiological study of patients. In this study, convenience sampling method had been used. The sample size was 22 patients aged 18-32 years old with inclusion criteria. The outcomes measured in this study were periodontal pocket depth (PPD), clinical attachment level (CAL) and alveolar bone height (ABH). Subjects were examined at distal surface (disto-buccal, mid-distal and disto-lingual) of second molar for PPD and CAL before and 3 months after the impacted adjacent lower third molar extraction. OPG was taken each before and after the third molar removal. These data were analyzed using SPSS version 16 and Wilcoxon-signed-ranks test was used to compare the PPD, CAL and ABH pre and post operatively. All the results were not significant with p >0.05. For PPD, median = 3mm pre and post extraction. CAL median= 2mm pre and post operatively and ABH median of 3.10mm (before) and 2.8mm (after) the third molar removal. From our study, we concluded that there were no significant changes of PPD, CAL and ABH at distal side of second molar after 3 months of the adjacent impacted lower third molar removal.
Study site: Dental clinics, Hospital Universiti Sains Malaysia (HUSM), Kelantan, Malaysia

Matched MeSH terms: Molar; Molar, Third

Fulltext Impacted mandibular third molars among patients attending Hospital Universiti Sains Malaysia

Rosfaima Othman Jaffar, Tin-Oo M.M.

Archives of Orofacial Sciences, 2009;4(1):7-12.

MyJurnal

The aim of this study was to identify the position of impacted mandibular third molars based on the classifications of Pell & Gregory and Winter, the indications for extraction, and the relation of post-operative complications and position. Records of patients who attended Hospital Universiti Sains Malaysia between January and December 2007 for surgical removal of mandibular third molars were reviewed. The angulation type, width and depth of impaction were determined by reviewing the orthopantomograms. The indications of extraction and occurrence of any post- operative complications were recorded. A total of 238 impacted teeth were surgically extracted from 194 patients (97 males, 97 females). The reasons for extraction include recurrent pericoronitis (43.1%) followed by prophylactic purposes (33.5%). Mesioangular impactions accounted for 52.3% and Class IIA position of impaction accounted for 45.7% of extractions. The most common post-operative complication was persistent pain and swelling (14.7%) followed by trismus (4.1%) and dry socket (3.0%). There was no significant relationship between the angulation, width and depth of impaction and the occurrence of complication. Mesioangular type and Class IIA position of impaction were the most common impaction. Although the association was not significant, high frequency of post-operative complications was observed in mesioangular, horizontal, IIA and IIC positions.

Matched MeSH terms: Molar; Molar, Third

Seven root canals in a deciduous maxillary molar detected by the dental operating microscope and micro-computed tomography

Ahmed HM, Khamis MF, Gutmann JL

Scanning, 2016 Nov;38(6):554-557.

PMID: 26751249 DOI: 10.1002/sca.21299

The root and root canal morphology of deciduous molars shows considerable variations. Consequently, a comprehensive understanding of the normal and unusual root and root canal configuration types in deciduous teeth is of prime importance. The purpose of this report is to describe a rare anatomical variation in a double-rooted maxillary deciduous molar examined by the dental operating microscope and micro-computed tomography. SCANNING 38:554-557, 2016. © 2016 Wiley Periodicals, Inc.

Matched MeSH terms: Molar/anatomy & histology*

Displaying publications 21 - 40 of 175 in total