MyMedR

Multidisciplinary treatment approach to restore deep horizontally fractured maxillary central incisor

Patil PG, Nimbalkar-Patil SP, Karandikar AB

J Contemp Dent Pract, 2014 Jan 1;15(1):112-5.

This case report demonstrates sequential periodontic, orthodontic and prosthodontic treatment modalities to save and restore deep horizontally fractured maxillary central incisor. The location of fracture was deep in the mucosa which reveals less than 2 mm of tooth structure to receive the crown. The procedures like surgical crown lengthening, endodontic post placement, orthodontic forced eruption, core build-up and metal-ceramic crown restoration were sequentially performed to conserve the fractured tooth. Forced eruption is preferred to surgical removal of supporting alveolar bone, since forced eruption preserves the biologic width, maintains esthetics, and at the same time exposes sound tooth structure for the placement of restorative margins.

Matched MeSH terms: Crowns

Effect of luting cements on the compressive strength of Turkom-Cera all-ceramic copings

Al-Makramani BM, Razak AA, Abu-Hassan MI

J Contemp Dent Pract, 2008;9(2):33-40.

PMID: 18264523

The objective of this study is to investigate the effect of different luting agents on the fracture strength of Turkom-Cera all-ceramic copings.

Matched MeSH terms: Crowns*

Age estimation using third molar development

Phrabhakaran N

Malays J Pathol, 1995 Jun;17(1):31-4.

PMID: 8907002

Teeth are the most durable structures in the human body. The pattern of their development has been used as a credible technique of age determination of unidentified bodies. Dental age estimation is by comparison of the dental status of an individual with published dental surveys. The third molars are the last teeth to erupt and are regarded as the most variable in the dentition. Nevertheless, radiographs depicting their growth have been used to determine the chronological age. A case for actual need for age estimation using a developing third molar is presented here.

Matched MeSH terms: Crowns

Evaluation of the marginal fit of a zirconia ceramic computer-aided machined (CAM) crown system

Baig MR, Tan KB, Nicholls JI

J Prosthet Dent, 2010 Oct;104(4):216-27.

PMID: 20875526 DOI: 10.1016/S0022-3913(10)60128-X

The marginal fit of crowns is a concern for clinicians, and there is no conclusive evidence of any one margin configuration yielding better results than others in terms of marginal fit.

Matched MeSH terms: Crowns*

The use of implants in the occlusal rehabilitation of a partially edentulous patient: a clinical report

Yunus N, Abdullah H, Hanapiah F

J Prosthet Dent, 2001 Jun;85(6):540-3.

PMID: 11404753

This article describes the occlusal rehabilitation of a partially edentulous patient who did not want a removable partial denture. Implants and extensive fixed restorations were used to restore posterior support and treat severely worn dentition, respectively. The treatment offered the patient a functional and esthetic result.

Matched MeSH terms: Crowns

The use of intraoral scanning and 3D printed casts to facilitate the fabrication and retrofitting of a new metal-ceramic crown supporting an existing removable partial denture

Patil PG, Lim HF

J Prosthet Dent, 2023 Jul;130(1):14-18.

PMID: 34774303 DOI: 10.1016/j.prosdent.2021.08.005

Fabricating a new crown to retrofit with an existing removable partial denture (RPD) is a complex procedure for both clinician and dental laboratory technician. The presented technique facilitates the fabrication and retrofitting of a metal-ceramic crown onto the principal abutment of the existing RPD by using 2-step intraoral scanning (with and without the RPD in place) and 2 different 3-dimensionally printed casts. The technique enables the dental laboratory technician to precisely reproduce the retentive areas, guiding planes, and rest seats on the retrofitted crown.

Matched MeSH terms: Crowns

Treatment of a maxillary dento-alveolar defect using an immediately loaded definitive zygoma implant-retained prosthesis with 11-month follow-up: a clinical report

Baig MR, Rajan G

J Oral Implantol, 2010;36(1):31-5.

PMID: 20218868 DOI: 10.1563/AAID-JOI-D-09-00062

This article describes the dental implant-based rehabilitation of a partially edentulous patient with a unilateral maxillary dento-alveolar defect. A screw-retained prosthesis with a modified design was fabricated on zygomatic and regular dental implants. One section of the implant prosthesis has cemented crowns and the other section is conventional screw-retained. The design of the prosthesis overcame the hard and soft tissue deficit and provided the desired esthetics.

Matched MeSH terms: Crowns

Edentulous arch treatment with a CAD/CAM screw-retained framework and cemented crowns: a clinical case report

Baig MR, Rajan G, Rajan M

J Oral Implantol, 2009;35(6):295-9.

PMID: 20017646 DOI: 10.1563/AAID-JOI-D-09-00012R1.1

This article describes the rehabilitation of a completely edentulous patient using a milled titanium implant framework and cemented crowns. This combined approach significantly offsets unsuitable implant position, alignment, or angulation, while ensuring the easy retrievability, repair, and maintenance of the prosthesis. Hence, the dual advantage of cemented-retained crowns reproducing appropriate esthetics and function, irrespective of where the screw access openings are located in the substructure, can be obtained, along with the splinting effect and management of soft and hard tissue deficits achievable with a screw-retained framework.

Matched MeSH terms: Crowns*

Remaining tooth structure associated with various preparation designs for the endodontically treated maxillary second premolar

Seow LL, Toh CG, Wilson NH

Eur J Prosthodont Restor Dent, 2005 Jun;13(2):57-64.

PMID: 16011232

Existing literature suggests a relationship between the amount of remaining tooth structure and the fracture resistance of the restored endodontically treated tooth. This study investigated the amount of tooth structure remaining following various tooth preparations used in the restoration of the endodontically treated maxillary second premolar. Illustrations of the maxillary second premolar in buccopalatal, mesiodistal and occlusal sections were drawn to scale. Outlines of various intra- and extracoronal preparations were superim-posed on the illustrations to reveal the amount of tooth tissue remaining in each case. Preparations for a ceramic inlay, inlay with palatal cusp coverage and onlay left 2.0-2.5mm of tooth structure buccally and palatally. Following preparation for a metal-ceramic crown, approximately 1.0mm of tooth structure remained buccally, and between 1.6mm-1.8mm palatally. Preparation for an all-ceramic crown was observed to leave 1.0mm-1.2mm of tooth structure surrounding what remained of the endodontic access cavity. It was concluded that decisions as to the type of definitive restoration to restore the endodontically treated maxillary second premolar may be influenced, amongst other factors, by information on the amount of tooth tissue remaining following preparation.

Matched MeSH terms: Crowns

A post crown technique

Yong LS

Dent J Malaysia Singapore, 1972 May;12(1):47-51.

PMID: 4507358

Matched MeSH terms: Crowns

Fulltext Computer-aided design and 3-dimensional artificial/convolutional neural network for digital partial dental crown synthesis and validation

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*

Enhanced post crown retention in resin composite-reinforced, compromised, root-filled teeth: a case report

Lui JL

Quintessence Int, 1999 Sep;30(9):601-6.

PMID: 10765865

The introduction of an intraradicular composite reinforcing technique, in conjunction with the reestablishment of matching post canal spaces, has allowed compromised, root-filled teeth to be restored with functional, esthetic post crowns. This clinical case report suggests that reconstituted post canals, in accurately adapting to passive, parallel-sided, matching, and well-fitting posts, can enhance the retention of post crowns. Other factors of clinical importance relating to the resin-reinforced technique are discussed, including fracture resistance, depth of polymerization, dentin adhesion, polymerization shrinkage, and coronal microleakage.

Matched MeSH terms: Crowns

Fulltext Physico-mechanical properties of the josapine pineapple fruits

Rosnah Shamsudin, Wan Ramli Wan Daud, Mohd Sobri Takrif, Osman Hassan

Pertanika Journal of Science & Technology, 2009;17(1):-.

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

Clinical Outcomes of Lithium Disilicate Single Crowns after a Mean Duration of 3 Years - A Retrospective Study

Saleh Samer M, Ali TT, Abdullah H

Oral Health Prev Dent, 2018 7 22;16(3):249-257.

PMID: 30027164 DOI: 10.3290/j.ohpd.a40758

PURPOSE: To investigate the clinical performance and clinical survival rate of lithium disilicate-based core ceramic (IPS e.max Press) utilised in single crowns and to the accompanying periodontal health status.

MATERIALS AND METHODS: A total of 47 patients with 88 IPS e.max Press single crowns were examined at the Faculty of Dentistry, University of Malaya, using modified United States Public Health Service evaluation criteria (USPHS). These 88 crowned teeth included 19 vital and 69 nonvital teeth that were restored with different post and core materials. The periodontal status was compared using the plaque index (PI), gingival recession (GR), modified papillary bleeding index (MPBI) and probing pocket depth (PPD) between the crowned teeth and contralateral control (sound) teeth.

RESULTS: About 96.6% of the crowns exhibited satisfactory clinical performance. The mean survival rate at three years was 97.7%, and 100% at two years with a low incidence of fractures. There were no staitistically significant differences in the mean gingival recession (p = 0.182) and mean plaque scores (p = 0.102) between crowned and control teeth. The crowned teeth had higher mean MPBI (p = 0.000) and PPD (p = 0.051) compared to the contralateral sound teeth. Periodontal response in relation to subgingival crown margins, was statistically significantly lower regarding pocket depths (p = 0.01) and bleeding on probing (p = 0.00).

CONCLUSION: IPS e.max Press crowns exhibited satisfactory clinical performance with high survival rate. No dentinal sensitivity was recorded. Plaque retention and gingival recession were similar to contralateral control teeth. Poor periodontal health was related to the subgingival crown margins.

Matched MeSH terms: Crowns*

Fulltext Clinical Outcomes and Predictors of Satisfaction in Patients with Improved Lithium Disilicate All-Ceramic Crowns

Samer MS, Faraz Q, Al-Dubai SAR, Vohra F, Abdullah H, Taiyeb-Ali TB, et al.

Med Princ Pract, 2017;26(5):470-479.

PMID: 28965115 DOI: 10.1159/000481864

OBJECTIVES: The aim of this study was to determine the clinical outcomes and predictors of satisfaction in patients with lithium disilicate (LD) ceramic crowns.

SUBJECTS AND METHODS: Clinical outcomes were assessed in 47 patients with 88 LD crowns using modified United States Public Health Service (USPHS) evaluation criteria and survival rates. The questionnaire for predictors included 3 aspects: (a) sociodemographic characteristics, (b) oral health habits (tooth brushing frequency, flossing frequency, and dental visits), and (c) satisfaction of the restorations (aesthetics, function, fit, cleansability, and chewing ability of the crowns, and overall satisfaction). Frequency distributions were computed using univariate and multivariate analysis. The Student t test and analysis of variance (ANOVA) were used to compare means across variables. Correlation analysis was done to assess the association between continuous variables.

RESULTS: The age of crowns was 34.7 ± 9.7 months. The survival rate was 96.6% at 35.9 ± 9.2 months. There was a significant association between successful crown function and oral hygiene measures: tooth brushing (p˂ 0.001), dental visits (p = 0.006), and flossing (p = 0.009). A strong negative correlation was observed between aesthetic satisfaction (r = -0.717, p˂ 0.001) and chewing ability (r = -0.639, p˂ 0.001) with crown age. The linear regression model was significant for all predictors (p < 0.05) except overall satisfaction (p > 0.05).

CONCLUSION: The LD crowns had long survival rates of 96.6% up to 35.9 ± 9.2 months and provided satisfactory clinical performance (low risk of failure). Oral hygiene habits such as brushing, flossing, and regular dental visits influenced patient satisfaction with LD crowns.

Matched MeSH terms: Crowns*

Fulltext Students perception and satisfactory level in preclinical fixed prosthodontic teaching: post and core

Marlynda Ahmad, Natasya Ahmad Tarib

Malaysian Dental Journal, 2008;29(2):128-134.

MyJurnal

Introduction: Preclinical teaching using simulation is very beneficial in training dental graduates. The use of laboratory simulation for its undergraduate training during the preclinical years has been used in dental education. Purpose: The aim of this study was to evaluate student’s perception, self evaluation and satisfactory level in preparing duralay burn-out post and core in preclinical fixed prosthodontics sessions.

Materials and Methods: The participants comprised of 104 fourth year dental undergraduates in the Faculty of Dentistry Universiti Kebangsaan Malaysia. The students had undergone preclinical session for endodontics during the 3rd year and had already completed root canal treatment on single rooted tooth. The same tooth was used for preclinical post and core preparation. The gutta percha was partially removed and the root canal was prepared. They then proceeded with the preparation of duralay build-up/pattern based on the lecture, video demonstration and manual given. Once completed and satisfied with their work, students were asked to answer the questionnaires in the simulation manual.

Results: Student response rate was 88.46% (92/104). Majority of the students were satisfied with their canal preparation, with about 5mm gutta percha left apically, appropriately shaped canal with sufficient retention and resistance form. They also thought that the surface of the duralay was good with no voids. With regards to the coronal preparation, majority of them incorporated ferrule effect and prepared preliminary crown preparation. More than half of the students claimed the level of difficulty of this procedure was moderate. Furthermore, majority of them said that the lecture and the preclinical manual were sufficient and helpful. The help from the supervisors was also benefit in preparing duralay burnout post and core.

Conclusions: From this study, majority of fourth year dental students could perform appropriate canal preparation as well as duralay pattern post and core. Only one student did not feel competent and confident in doing canal preparation and duralay pattern post and core. Our teaching methods and aids were proven to help them in preparing these tasks.

Matched MeSH terms: Crowns

Fulltext Management of an unerupted, dilacerated maxillary permanent central incisor by a combined surgical - orthodontic approach: a case report

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

Fulltext Dental rehabilitation of amelogenesis imperfecta using thermoformed templates

Sockalingam S

J Indian Soc Pedod Prev Dent, 2011 Jan-Mar;29(1):53-6.

PMID: 21521920 DOI: 10.4103/0970-4388.79938

Amelogenesis imperfecta represents a group of dental developmental conditions that are genomic in origin. Hypoplastic AI, hypomineralised AI or both in combination were the most common types seen clinically. This paper describes oral rehabilitation of a 9-year-old Malay girl with inherited hypoplastic AI using transparent thermoforming templates. The defective surface areas were reconstructed to their original dimensions on stone cast models of the upper and lower arches using composite, and transparent thermoform templates were fabricated on the models. The templates were used as crown formers to reconstruct the defective teeth clinically using esthetically matching composite. The usage of the templates allowed direct light curing of the composite, accurate reproducibility of the anatomic contours of the defective teeth, reduced chair-side time and easy contouring and placement of homogenous thickness of composite in otherwise inaccessible sites of the affected teeth.

Matched MeSH terms: Crowns*

Effect of aging on coronal microleakage in access cavities through metal ceramic crowns restored with resin composites

Al-Maqtari AA, Lui JL

J Prosthodont, 2010 Jul;19(5):347-56.

PMID: 20456026 DOI: 10.1111/j.1532-849X.2010.00593.x

The purpose of this in vitro study was to determine if packable resin composite with/without flowable resin composite has the ability to prevent coronal leakage in restored endodontic access openings following aging.

Matched MeSH terms: Crowns*

Comparison of the load at fracture of Turkom-Cera to Procera AllCeram and In-Ceram all-ceramic restorations

AL-Makramani BM, Razak AA, Abu-Hassan MI

J Prosthodont, 2009 Aug;18(6):484-8.

PMID: 19694015

PURPOSE: This study investigated the occlusal fracture resistance of Turkom-Cerafused alumina compared to Procera AllCeram and In-Ceram all-ceramic restorations.

MATERIALS AND METHODS: Sixmaster dies were duplicated from the prepared maxillary first premolar tooth using nonprecious metal alloy (Wiron 99). Ten copings of 0.6 mm thickness were fabricated from each type of ceramic, for a total of thirty copings. Two master dies were used for each group, and each of them was used to lute five copings. All groups were cemented with resin luting cement Panavia F according to manufacturer's instructions and received a static load of 5 kg during cementation. After 24 hours of distilled water storage at 37 degrees C, the copings were vertically compressed using a universal testing machine at a crosshead speed of 1 mm/min.

RESULTS: The results of the present study showed the following mean loads at fracture: Turkom-Cera (2184 +/- 164 N), In-Ceram (2042 +/- 200 N), and Procera AllCeram (1954 +/- 211 N). ANOVA and Scheffe's post hoc test showed that the mean load at fracture of Turkom-Cera was significantly different from Procera AllCeram (p < 0.05). Scheffe's post hoc test showed no significant difference between the mean load at fracture of Turkom-Cera and In-Ceram or between the mean load at fracture of In-Ceram and Procera AllCeram.

CONCLUSION: Because Turkom-Cera demonstrated equal to or higher loads at fracture than currently accepted all-ceramic materials, it would seem to be acceptable for fabrication of anterior and posterior ceramic crowns.

Matched MeSH terms: Crowns*

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