Displaying publications 1 - 20 of 55 in total

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  1. Yong LS
    Dent J Malaysia Singapore, 1972 May;12(1):47-51.
    PMID: 4507358
    Matched MeSH terms: Crowns
  2. Hassan LA, Goo CL
    Dent Mater J, 2021 Sep 30;40(5):1189-1195.
    PMID: 34078778 DOI: 10.4012/dmj.2020-408
    This research aimed to evaluate the effect of cement space on the marginal discrepancy and retention of computer-aided design/computer-aided manufacturing (CAD/CAM) crowns. A total of 30 premolar Frasaco teeth were machined to receive crowns with cement spaces of 70, 90, and 110 μm. The marginal discrepancy measurements were done before and after cementation. Pull-off test was conducted using universal testing machine (UTM). Data was analyzed using two-way mixed ANOVA with post-hoc Bonferroni test and Kruskal-Wallis test. The crowns with cement space of 70 μm showed a significantly higher absolute marginal discrepancy than those with 90 and 110 μm. No significant effect on the crown retention was found. Within the limitations of this study, modifying cement space to 90 μm and 110 μm may improve the marginal adaptation of CAD/CAM crown, whereas adjusting cement space from 70 to 110 μm did not significantly affect the crown retention.
    Matched MeSH terms: Crowns*
  3. Abd Wahab MH, Bakar WZ, Husein A
    J Conserv Dent, 2011 Oct;14(4):387-90.
    PMID: 22144809 DOI: 10.4103/0972-0707.87207
    Porcelain from prosthesis such as crown or bridge can be fractured if exposed to trauma; and, can be repaired at chairside using composite resin.
    Matched MeSH terms: Crowns
  4. Kohli S, Bhatia S, Al-Haddad A, Pulikkotil SJ, Jamayet NB
    J Prosthodont, 2022 Feb;31(2):102-114.
    PMID: 34516686 DOI: 10.1111/jopr.13433
    PURPOSE: This is a systematic review to identify the incidence of pulp necrosis and/or periapical changes among vital teeth which are used as an abutment for crown and fixed partial dentures (FPDs).

    MATERIALS AND METHODS: Two reviewers independently searched two electronic databases, PubMed and Scopus. The search was complemented from references of included studies and published reviews. Studies published in the English language through January 2021 that had assessed and documented the clinical and radiographic failure of crown or FPD in vital permanent teeth due to pulpal or periapical pathology with a follow-up of at least 12 months were selected. Data screening, data collection and extraction of data was performed. Quality of studies involved was analyzed using the Newcastle-Ottawa Quality Assessment Scale for cohort studies. Meta-analysis was done using random effects model. Publication bias was assessed using funnel plots.

    RESULTS: Electronic searches provided 10,075 records among which 20 studies were selected for systematic review and 7 studies were selected for meta-analysis. With respect to quality assessment, all the studies involved were considered as high quality as the score in scale ranged between 6 and 9 as per the Newcastle-Ottawa Quality Assessment Scale for cohort studies. The meta-analyses showed that there was no statistically significant difference in the incidence of the loss of pulp vitality or pulp necrosis through clinical and radiographic examination with the follow up period of 5 years: p < 0.001, 95% CI: 0.96-1.00, I2 = 77.84%; 10 years: p < 0.001, 95% CI: 0.88-0.95, I2 = 93.59%; 15 years: p < 0.001, 95% CI: 0.92-0.96, I2 = 94.83%; and 20 years: p < 0.001, 95% CI: 0.94-0.96, I2 = 95.01%.

    CONCLUSIONS: The meta-analysis revealed clinical and radiographic success rate ranging between 92% to 98% at different follow up periods ranging between 5 years and 20 years. Future high-quality randomized clinical controlled trials with a larger population are required to confirm the evidence as only observational studies were considered in this paper.

    Matched MeSH terms: Crowns
  5. Mohamed Khazin S, Abdullah D, Liew AKC, Soo E, Ahmad Tarib N
    Aust Endod J, 2022 Apr;48(1):8-19.
    PMID: 34609035 DOI: 10.1111/aej.12567
    This study aimed to determine the incidence and contributing factors to pulpal and periapical disease in crowned vital teeth. Seventy-three pairs of healthy teeth were included and divided into two groups; 'crowned' and 'untreated' groups. The crowned group was prepared for full coverage crown and no treatment was carried out on the untreated group. Both groups were subjected to clinical and radiographic examination to detect endodontic signs and symptoms pre-operatively and one-week after crown cementation. Electric pulp test was also subjected to both groups, pre-operatively, after tooth preparation and before crown cementation. The incidence of pulpal and periapical disease was 6.8% and 1.4%, respectively, after tooth preparation. Factors associated with pulpal and periapical disease were exposed pulp during tooth preparation and pre-operative bone level <35%. Despite the low incidence, the occurrence of pulpal and periapical disease within a short period is noteworthy.
    Matched MeSH terms: Crowns
  6. Sulaiman E, Alarami N, Wong YI, Lee WH, Al-Haddad A
    Dent Med Probl, 2018 10 18;55(3):275-279.
    PMID: 30328305 DOI: 10.17219/dmp/94656
    BACKGROUND: There is no sufficient literature on the effect of post location on endodontically treated premolar teeth with 2 roots.

    OBJECTIVES: The aim of the study was to evaluate the effect of fiber post location on fracture resistance and failure mode of endodontically treated premolars with 2 roots.

    MATERIAL AND METHODS: Fifty extracted maxillary first premolars with 2 roots were divided randomly into 5 groups. Group 1 was comprised of sound teeth, which received only metal crowns (control). Teeth from groups 2, 3, 4, and 5 were decoronated 2 mm above the cementoenamel junction (CEJ) and were endodontically treated. No post was placed in group 2 teeth. Teeth from groups 3, 4 and 5 were given a fiber post placed in the buccal canal, palatal canal, and both buccal and palatal canals, respectively. All teeth in groups 2, 3, 4, and 5 were built up with composite and full coverage metal crowns. A compressive static load was applied at an angle of 25° to the crowns with a crosshead speed of 0.5 mm/min, until fracture.

    RESULTS: One-way analysis of variance (ANOVA) showed significant differences among the groups (p = 0.002). A post hoc test showed significantly lower fracture resistance of group 4 compared to group 5 (p = 0.011). Furthermore, group 2 had significantly less fracture resistance compared to group 1 (p = 0.021) and group 5 (p = 0.002). According to Fisher's exact test, different post locations are non-significantly associated with fracture mode (p = 0.256).

    CONCLUSIONS: Fiber post location has a significant effect on fracture resistance of severely damaged, endodontically treated maxillary premolars with 2 roots. However, post placement in the palatal root is preferred, as it maintains the restorability of the tooth.

    Matched MeSH terms: Crowns*
  7. Farook TH, Ahmed S, Jamayet NB, Rashid F, Barman A, Sidhu P, et al.
    Sci Rep, 2023 Jan 28;13(1):1561.
    PMID: 36709380 DOI: 10.1038/s41598-023-28442-1
    The current multiphase, invitro study developed and validated a 3-dimensional convolutional neural network (3D-CNN) to generate partial dental crowns (PDC) for use in restorative dentistry. The effectiveness of desktop laser and intraoral scanners in generating data for the purpose of 3D-CNN was first evaluated (phase 1). There were no significant differences in surface area [t-stat(df) = - 0.01 (10), mean difference = - 0.058, P > 0.99] and volume [t-stat(df) = 0.357(10)]. However, the intraoral scans were chosen for phase 2 as they produced a greater level of volumetric details (343.83 ± 43.52 mm3) compared to desktop laser scanning (322.70 ± 40.15 mm3). In phase 2, 120 tooth preparations were digitally synthesized from intraoral scans, and two clinicians designed the respective PDCs using computer-aided design (CAD) workflows on a personal computer setup. Statistical comparison by 3-factor ANOVA demonstrated significant differences in surface area (P 
    Matched MeSH terms: Crowns*
  8. Yahya, N.A., Youngson, C.C.
    Ann Dent, 2007;14(1):7-13.
    MyJurnal
    The purpose of this study were to compare the emergence profiles of crowns with their contralateral tooth, in vitro, and to determine if there is any association between the design of tooth preparations and the resultant emergence profile. 50 working models used for single crown construction were examined. Measurements of the faciolingual width of the crowns and contralateral teeth were taken using digital calipers. Internal line angles and the margin width of dies and the emergence profile of the corresponding crowns were measured from longitudinally sectioned polyvinylsiloxane indices mounted on a flat-bed scanner using image analysis software. Using Students t tests, no statistically significant differences (p>0.05) were found for shoulder width (mean 0.94 ± 0.23mm), internal line angle (mean 105.83 ± 13.57°) or emergence profiles (28.56 ± 12.95°) in the different (anterior, premolar or molar) preparations or crowns. The mean emergence profiles for all crowns was statistically significantly greater (p
    Matched MeSH terms: Crowns
  9. Lui, J.L.
    Ann Dent, 2007;14(1):14-18.
    MyJurnal
    During post crown restoration, the preparation of the post canal can be fraught with difficulties resulting in widening, gouging and transportation of the post canal; sometimes with near root perforation. A technique is described to repair such iatrogenically damaged internal root canal walls using reinforcing resin composite and optic glass fibre posts. The root dentine, resin composite and glass fibres, having similar moduli of elasticity, will result in a repaired root with a ‘monolithic’ structure and possessing numerous desirable characteristics. This repair technique can easily be carried out in one sitting at the chairside thereby allowing the continued serviceability of the iatrogenically compromised root-filled tooth.
    Matched MeSH terms: Crowns
  10. Mohd. Bakri, M., Whittaker, D.A.
    Ann Dent, 2003;10(1):-.
    MyJurnal
    The ultrastructure of the odontoblast reflects the certain phases that the cell undergoes in their lifecycle. Ultrastructure studies of the odontoblasts have often been carried out using young teeth. In this study, teeth from an older individual have been used to study the odontoblasts from the crown and root area. The odontoblasts from the crown area retain their columnar shape while odontoblasts from the root area appeared to be flattened. The organelles present in the odontoblasts either from the crown or root area was observed to be reduced.
    Matched MeSH terms: Crowns
  11. Rosnah Shamsudin, Wan Ramli Wan Daud, Mohd Sobri Takrif, Osman Hassan
    MyJurnal
    The physico-mechanical properties data of fruits are important in the design of various handling, packing, and storage and transportation system. The physical-mechanical properties of pineapple fruit from the Josapine variety, namely the weight of the fruit (with and without peel), pulp to peel ratio, diameter of the whole fruit (with and without peel), at three different positions along the longitudinal axis of the fruit, length of the fruit (with and without peel) and the length of crown were studied using the standard method at seven stages of maturity during storage at 25°C and 52% (RH). The effect of fruit maturity on the firmness of each fruit at three different locations was measured using a cylindrical die of 6 mm in diameter with the Instron Universal Testing Machine. The results indicated that the average total weight of a single fruit is 886.86 ± 49.67 g. The average pulp to peel ratio is 1.91. The average diameter (with and without peel) was 86.83 ± 5.24 mm and 80.95 ± 4.15 mm (top section), 100.77 ± 3.84 mm and 90.19 ± 3.73 mm (middle section) and 97.17 ± 3.49 mm and 73.30 ± 5.11 mm (bottom section), respectively. The average length of the fruit (with and without peel) was 126.65 mm and 113.64 mm, respectively. The average length of crown was 89.13 mm. The firmness of the fruits was found to decrease with the stage of maturity. These data are important in determining the optimum stage of maturity for fruit processing.
    Matched MeSH terms: Crowns
  12. Babar, Muneer Gohar, Gonzalez, Ma Angela
    MyJurnal
    Background: The importance of tooth sectioning is realized in disasters such as earthquake, airplane crash investigation, terror, micro leakage studies, age estimation etc. The objective of this study was to develop a simple method to make thin sections (approximately 100 mm) from freshly extracted teeth.

    Methods: One hundred and twenty human premolars recently extracted for orthodontic purpose were used for this study. The teeth were stored in 0.5% chorlaramine for 2 weeks and were not allowed to dry at any stage of the experiment. The teeth were thoroughly washed in distilled water teeth and then were sectioned buccolingually from crown to the root portion.

    Results: A detailed embedding-cutting-mounting procedure is described. The prepared thin ground sections were then examined under a Polarised light microscope for the enamel and the dentine, as well as the caries lesions can clearly be distinguished.

    Conclusion: This is an effective and efficient method for preparation of ground sections in which the hard tissue details are preserved.
    Matched MeSH terms: Crowns
  13. Khan, A., Mohd Noor, N.S., Sukumaran, P., Sheikh Aladin, S.H.A., Wai Ying, Y.
    Ann Dent, 2016;22(2):1-8.
    MyJurnal
    This clinical audit is aimed to provide an insight into the performance of dental technicians in rendering
    fixed prosthodontics services at Faculty of Dentistry, University of Malaya. A retrospective audit was
    carried out between 1st of November 2014 and 31st January 2015 using data derived from records and
    monthly returns of the technicians, which are kept at the ceramic laboratory. Retrospective data on
    cases of diagnostic wax-ups, full metal crowns, metal ceramic crowns, all ceramic crowns and bridges
    that were sent to ceramic laboratory for fabrication from 1st of September 2013 to 31st of August 2014
    was systematically extracted from the record and tabulated categorically in SPSS version 22.0. The
    turnaround time in workings day for diagnostic wax-ups and the prostheses was calculated by deducting
    exit date from entry date. Subsequently, the turnaround time and the complexity of cases were categorized
    accordingly. The association of turnaround time and the complexity of the cases was analysed using
    Fisher Exact test with p value < 0.05. Within this time frame, a total of 102 cases of diagnostic waxups,
    36 cases of crown and 18 cases of bridges were fabricated. 57.8% of diagnostic wax-ups were
    completed within 3 days. 100% of 1 unit crown were completed within 7 days and 94.4% of bridges were
    completed within 14 days. There was a significant association of turnaround time and the complexity of
    the cases for diagnostic wax-ups and crowns with p value
    Matched MeSH terms: Crowns
  14. Ahmed HM, Al Rayes MH, Saini D
    J Conserv Dent, 2012 Jan;15(1):77-9.
    PMID: 22368341 DOI: 10.4103/0972-0707.92612
    Crown fractures are common detrimental consequences of dental traumatic injuries. Early management of such cases is mandatory in order to prevent subsequent pathological changes that could further complicate the treatment. Pulp necrosis, chronic and cystic apical periodontitis can be the fate if these teeth are left untreated. Despite these serious complications, root canal treatment followed by apical surgery is considered a valid treatment option when such cases become complicated with large periapical lesions. However, whether a retrograde filling is essential to be placed or not is still a matter of debate. This case report discusses the orthograde endodontic management, the surgical approach and the clinical outcomes of longstanding crown fractured teeth with large cyst-like periapical lesions with and without retrograde filling.
    Matched MeSH terms: Crowns
  15. Ang Y, Tew IM
    J Conserv Dent, 2021 02 11;23(6):644-647.
    PMID: 34083924 DOI: 10.4103/JCD.JCD_533_20
    Restoring extensively damaged endodontically treated posterior teeth is always a challenge in dentistry. The use of endocrowns has gained popularity in restoring severely damaged endodontically treated teeth (ETT) in recent years. In this clinical report, a structurally compromised mandibular second molar with symptomatic irreversible pulpitis and normal apical tissue was endodontically treated. Surgical crown lengthening was attempted thereafter to increase the crown height. However, marginal periodontal tissue re-growth occurred after surgical crown lengthening. The tooth was subsequently restored with endocrown which was fabricated using computer-aided design and computer-aided manufacturing-based hybrid-ceramic. In conclusion, endocrown can be a viable restorative modality for ETT with compromised clinical crown height.
    Matched MeSH terms: Crowns
  16. Farook TH, Barman A, Abdullah JY, Jamayet NB
    J Prosthodont, 2021 Jun;30(5):420-429.
    PMID: 33200429 DOI: 10.1111/jopr.13286
    PURPOSE: Mesh optimization reduces the texture quality of 3D models in order to reduce storage file size and computational load on a personal computer. This study aims to explore mesh optimization using open source (free) software in the context of prosthodontic application.

    MATERIALS AND METHODS: An auricular prosthesis, a complete denture, and anterior and posterior crowns were constructed using conventional methods and laser scanned to create computerized 3D meshes. The meshes were optimized independently by four computer-aided design software (Meshmixer, Meshlab, Blender, and SculptGL) to 100%, 90%, 75%, 50%, and 25% levels of original file size. Upon optimization, the following parameters were virtually evaluated and compared; mesh vertices, file size, mesh surface area (SA), mesh volume (V), interpoint discrepancies (geometric similarity based on virtual point overlapping), and spatial similarity (volumetric similarity based on shape overlapping). The influence of software and optimization on surface area and volume of each prosthesis was evaluated independently using multiple linear regression.

    RESULTS: There were clear observable differences in vertices, file size, surface area, and volume. The choice of software significantly influenced the overall virtual parameters of auricular prosthesis [SA: F(4,15) = 12.93, R2 = 0.67, p < 0.001. V: F(4,15) = 9.33, R2 = 0.64, p < 0.001] and complete denture [SA: F(4,15) = 10.81, R2 = 0.67, p < 0.001. V: F(4,15) = 3.50, R2 = 0.34, p = 0.030] across optimization levels. Interpoint discrepancies were however limited to <0.1mm and volumetric similarity was >97%.

    CONCLUSION: Open-source mesh optimization of smaller dental prostheses in this study produced minimal loss of geometric and volumetric details. SculptGL models were most influenced by the amount of optimization performed.

    Matched MeSH terms: Crowns
  17. Nadzirah, K.Z., Zainal, S., Noriham, A., Normah, I., Siti Roha, A.M., Nadya, H.
    MyJurnal
    The aim of this study is to determine colour changes during storage and physico- chemical properties of peel, core and crown extracts of pineapple variety N36 for maturity indices of 1, 2 and 3. The L* (lightness), a* (redness) and b* (yellowness) values for peels increased significantly (p ≤ 0.05) at each maturity stage during seven days storage. pH of pineapple peel, core and crown extracts were in the range of 3.24 to 3.84. The titratable acidity, percentage of pulp and Total Soluble Solid (TSS) of pineapple peel, core and crown extracts were in the range of 0.16 to 0.36%, 1.37 to 2.91% and 1.4 to 5.3˚Brix, respectively. Fructose and glucose contents were significantly highest (p ≤ 0.05) in pineapple core extract followed by pineapple peel extract and pineapple crown extract for maturity index 2. Significant difference (p ≤ 0.05) was found in sucrose content between pineapple core and peel extracts with 8.92% and 3.87%, respectively for maturity index 3. However, sucrose was not detected in pineapple crown extract. Pineapple core extract was significantly higher (p ≤ 0.05) amount of total sugar content compared to pineapple peel and crown extracts for all maturity indices.
    Matched MeSH terms: Crowns
  18. Michael, Mera Christina, Adam Husein, Wan Zaripah Wan Bakar, Eshamsul Sulaiman
    MyJurnal
    Endodontically treated teeth are generally weaker than sound teeth. The study objective was to compare the fracture resistance of endodontically treated teeth restored with different restorative techniques. Fifty extracted human maxillary central incisors of similar size were divided into five groups of 10 teeth. Group 1 was left intact as the control group. Other groups (Groups 2, 3, 4 and 5) were all endodontically treated followed by restorations using different restorative techniques; light cured composite resin (CR), CR and crown, post and CR, and post-CR core and crown respectively. The specimens were loaded in a universal testing machine with a static force at a crosshead speed of 0.5mm/min at 135 ° to the long axis of the root until failure. The means and the standard deviations of the maximum load at failure for groups 1, 2, 3, 4 and 5 were 1259.11N (379.12N), 578.63N (196.70N), 667.13N (298.72N), 1247.65N (294.48N) and 623.60N (193.75N) respectively. The results of one-way ANOVA showed statistically significant differences existed among the groups tested (p
    Matched MeSH terms: Crowns
  19. Razak, I.A.
    Ann Dent, 1995;2(1):-.
    MyJurnal
    A 73.1 percent response rate was obtained in a postal questionnaire survey conducted among Malaysian dentists to assess their attitudes and needs for continuing dental education. It appeared that on an average the Malaysian dentist spent very little time on continuing education,reading journals and participation in professional dental meetings.The need for continuing education was strongly evident as almost all dentists indicated that such activities be further developed in Malaysia. Crown and Bridgework, Oral Surgery and Orthodontic appeared to be areas in which more continuing education were required.
    Matched MeSH terms: Crowns
  20. Sockalingam, G., Ngah, I.
    Malaysian Dental Journal, 2007;28(2):99-102.
    MyJurnal
    This case report presents a combined surgical – orthodontic approach to the management of an unerupted maxillary right permanent central incisor in a 13 year-old Chinese male. Radiographic investigations revealed that the tooth was severely dilacerated, most likely as a result of trauma sustained to the upper maxillary right deciduous central incisor at the age of 3 years. After securing adequate space for the unerupted tooth by fixed appliance therapy, surgical exposure of the crown was carried out under local anaesthesia and oral sedation.
    A gold chain was bonded to the exposed crown of the tooth. Traction was then carried out and the tooth was successfully brought to its final and correct position in the arch after 36 months of active orthodontic treatment.
    Matched MeSH terms: Crowns
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