MyMedR

Fulltext A Proposal to Develop a New Classification for Pulp Chamber Anatomy

Ahmed HMA, Keleş A, Wolf TG, Rossi-Fedele G, Dummer PMH

Eur Endod J, 2024 Jan 01;9(1):1-7.

PMID: 37990574 DOI: 10.14744/eej.2023.82713

Matched MeSH terms: Tooth Crown/anatomy & histology

Changes in cell density and morphology of selected cells of the ageing human dental pulp

Daud S, Nambiar P, Hossain MZ, Rahman MR, Bakri MM

Gerodontology, 2016 Sep;33(3):315-21.

PMID: 25266855 DOI: 10.1111/ger.12154

OBJECTIVES: The aim of this study was to determine the changes in cell density and morphology of selected cells of the ageing human dental pulp.

BACKGROUND: Changes in cell density and morphology of dental pulp cells over time may affect their capability to respond to tooth injury.

MATERIALS AND METHODS: One hundred thirty-one extracted teeth were obtained from individuals between the ages of 6 and 80 years. The apical 1/3 of the root region was removed from all teeth prior to routine processing for producing histological slides. The histology slides were used to study the changes in cell density and morphology of selected pulp cells; odontoblasts, subodontoblasts and fibroblasts in the crown and root regions of the dental pulp. Student's t-test and one-way anova were used for statistical analyses.

RESULTS: In all age groups, the cell density for all types of cells was found to be higher in the crown than in the root (p crown and root regions. However, it was noted that the reduction of coronal odontoblasts occurred later in life (40-49 years) when compared to that of subodontoblasts or fibroblasts (30-39 years).

CONCLUSIONS: The density of the coronal pulp cells reduces and these cells undergo morphological changes with ageing of individuals and this may affect the pulp's ability to resist tooth injury.

Matched MeSH terms: Tooth Crown/cytology; Tooth Crown/pathology

Variations in tooth size and arch dimensions in Malay schoolchildren

Hussein KW, Rajion ZA, Hassan R, Noor SN

Aust Orthod J, 2009 Nov;25(2):163-8.

PMID: 20043553

To compare the mesio-distal tooth sizes and dental arch dimensions in Malay boys and girls with Class I, Class II and Class III malocclusions.

Matched MeSH terms: Tooth Crown/anatomy & histology; Tooth Crown/pathology

Fulltext Management and prognosis of teeth with trauma induced crown fractures and large periapical cyst like lesions following apical surgery with and without retrograde filling

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: Tooth Crown

Bone regeneration at the distal aspect of the adjacent second molar after lower third molar coronectomy: a long-term analysis

Leung YY, Yeung AWK, Ismail IN, Wong NSM

Int J Oral Maxillofac Surg, 2020 Oct;49(10):1360-1366.

PMID: 32340909 DOI: 10.1016/j.ijom.2020.03.016

A residual bone defect at the distal aspect of the adjacent second molar may occur after total removal of the lower third molar. Lower third molar coronectomy has been proved to be a safe alternative to total removal, but the extent of bone regeneration at the adjacent tooth after coronectomy is not well reported. The aim of this prospective study was to investigate the long-term bone regeneration at the distal aspect of the adjacent second molar after lower third molar coronectomy. Preoperative and postoperative cone beam computed tomography scans were measured to assess bone regeneration at the distobuccal (DB), mid-distal (MD), and distolingual (DL) aspects of the lower second molar. Forty-eight coronectomies in 37 patients (23 female) with a mean±standard deviation age of 29.1±7.2 years were assessed. The mean follow-up was 93.2±8.7 months. The mean bone level increase at DB, MD, and DL aspects was 3.2±1.6mm, 3.5±1.5mm, and 3.2±1.6mm, respectively; the bone levels were significantly higher than the preoperative measurements (P<0.001). Age and impaction patterns were not factors affecting bone regeneration. Based on this study, it appears that coronectomy of the lower third molar brings favourable bone regeneration at the distal aspect of the adjacent second molar.

Matched MeSH terms: Tooth Crown

Fulltext Fixed screw-retained interim restorations with immediate implant placement in esthetic zone: A case series with six different techniques

Kher U, Patil PG, Tunkiwala A, Nimbalkar S

J Indian Prosthodont Soc, 2022;22(1):97-103.

PMID: 36510953 DOI: 10.4103/jips.jips_229_21

Postextraction immediate implant placement in the esthetic zone is a common treatment modality. Immediate fixed interim restoration following immediate implant placement may provide excellent esthetic results to the patients and boost the clinicians' confidence. This paper demonstrates a series of six different techniques used to fabricate the customized screw-retained interim restorations following immediate implant placement with partial extraction therapy in the maxillary anterior esthetic zone. The techniques have utilized a putty index, polycarbonate shell crown, patients' existing crowns (prosthetic or natural), or laminate veneer, or fabricated in the laboratory based on the specific clinical situation. Advantages and limitations of each technique including alternative techniques or materials have been discussed. Excellent esthetic results were obtained with all six techniques using the screw-retained immediate interim restorations following partial extraction therapy and immediate implant placement.

Matched MeSH terms: Tooth Crown

Odontometric sex variation in Malaysians with application to sex prediction

Khamis MF, Taylor JA, Malik SN, Townsend GC

Forensic Sci Int, 2014 Jan;234:183.e1-7.

PMID: 24128748 DOI: 10.1016/j.forsciint.2013.09.019

Information about the sex of individuals is important for human identification. This study was conducted to quantify classification rates of sex prediction models for Malaysians using odontometric profiles. Mesiodistal (MD) and buccolingual (BL) crown dimensions of the permanent dentition were studied in 400 young adult Malaysians, giving a total of 28 tooth size variables. The sample consisted of three major ethnic groups, the Malays, Chinese and Tamils, since the aim was to assess sex dimorphism in Malaysians as a whole. Results showed that the mesiodistal diameter of the lower canine was the most sexually dimorphic dimension in Malaysian Malays and Tamils. Univariate analyses showed that the magnitude and pattern of sex dimorphism varies between these three ethnic groups, with Malaysian Chinese and Tamils being more dimorphic than the Malaysian Malays. Stepwise discriminant functions were generated bearing in mind their application in practical forensic situations. The range of classification rates was from 70.2% to 78.5% for the composite Malaysian group, and 83.8%, 77.9%, 72.4% for Malaysian Chinese, Malays and Tamils, respectively. The 'Area Under the Receiver Operating Characteristic Curve statistics' indicated good classification rates for three prediction models obtained using a combination of all tooth size variables, mandibular teeth, and mesiodistal dimensions in the composite Malaysian group, and for all tooth size variables in each ethnic group. The present study provides strong support for the value of odontometry as an adjunct scientific method for sex prediction in human identification.

Matched MeSH terms: Tooth Crown/anatomy & histology*

Validity and reliability of tooth size and dental arch measurements: a stereo photogrammetric study

Al-Khatib AR, Rajion ZA, Masudi SM, Hassan R, Townsend GC

Aust Orthod J, 2012 May;28(1):22-9.

PMID: 22866590

The development of three-dimensional computer imaging has many applications in dentistry, including the analysis of dental casts.

Matched MeSH terms: Tooth Crown/anatomy & histology*

Tooth size discrepancies in an orthodontic population

Othman S, Harradine N

Angle Orthod, 2007 Jul;77(4):668-74.

PMID: 17605478

To explore how many millimeters of tooth size discrepancy (TSD) are clinically significant, to determine what percentage of a representative orthodontic population has such a tooth size discrepancy, and to determine the ability of simple visual inspection to detect such a discrepancy.

Matched MeSH terms: Tooth Crown/anatomy & histology

Fulltext Evaluation of maxillary anterior teeth and their relation to the golden proportion in Malaysian population

Al-Marzok MI, Majeed KR, Ibrahim IK

BMC Oral Health, 2013;13:9.

PMID: 23347800 DOI: 10.1186/1472-6831-13-9

The maxillary anterior teeth are important in achieving pleasing dental aesthetics. Various methods are used to measure the size and form of them, including the golden proportion between their perceived widths, and the width-to-height ratio, referred to as the golden standard. The purpose of this study was conducted to evaluate whether consistent relationships exist between tooth width and height of the clinical crown dimensions; and to investigate the occurrence of the golden proportion of the maxillary anterior teeth.

Matched MeSH terms: Tooth Crown/anatomy & histology*

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: Tooth Crown/abnormalities*; Tooth Crown/radiography

Prevalence and patterning of maxillary premolar accessory ridges (MxPARs) in several human populations

Mihailidis S, Scriven G, Khamis M, Townsend G

Am. J. Phys. Anthropol., 2013 Sep;152(1):19-30.

PMID: 23913636 DOI: 10.1002/ajpa.22323

We present new data on the prevalence and patterning of the maxillary premolar accessory ridge (MxPAR), a common but understudied morphological dental trait that is expressed as a linear elevation extending from the buccal cusp ridge to the medial sulcus of maxillary premolar teeth. A total of 579 sets of dental casts, representing six ethnic groups, were scored using the five-grade system proposed by Burnett et al. (2010). The frequency and distribution of the MxPAR were determined by tooth type, sex, side, locus and ethnicity, and the applicability of the scoring system was assessed. The MxPAR was found in approximately two-thirds of premolar teeth, more often on second than first premolars, and more often on the distal aspect of the occlusal surface than the mesial. There was some evidence that more pronounced forms of the feature occurred more often in males than females, and that there may be some directionality in its expression between sides. Variation was also noted in the frequency of occurrence and degree of expression of the MxPAR between ethnic groups. Intra- and inter-observer concordance rates for scoring the MxPAR were low, confirming that it was difficult to score the trait identically on two different occasions. Our findings have clarified the distribution of the MxPAR within the dentition and between ethnic groups, and highlighted the need for researchers to carry out thorough replicability studies and to decide on an appropriate breakpoint for determining presence or absence of this feature before embarking on genetic studies or bio-distance analyses.

Matched MeSH terms: Tooth Crown/anatomy & histology*

Validity and reproducibility of ICDAS II in primary teeth

Shoaib L, Deery C, Ricketts DN, Nugent ZJ

Caries Res, 2009;43(6):442-8.

PMID: 19907175 DOI: 10.1159/000258551

The aim of this in vitro study was to assess the validity and reproducibility of the ICDAS II (International Caries Detection and Assessment System) criteria in primary teeth. Three trained examiners independently examined 112 extracted primary molars, ranging from clinically sound to cavitated, set up in groups of 4 to mimic their anatomical positions. The most advanced caries on the occlusal and approximal surfaces was recorded. Subsequently the teeth were serially sectioned and histological validation was undertaken using the Downer and Ekstrand-Ricketts-Kidd (ERK) scoring systems. For occlusal surfaces at the D(1)/ERK(1) threshold, the mean specificity was 90.0%, with a sensitivity of 75.4%. For approximal surfaces, the specificity and sensitivity were 85.4 and 66.4%, respectively. For occlusal surfaces at ICDAS code > or =3 (ERK(3) threshold), the mean specificity and sensitivity were 87.0 and 78.1%, respectively. For approximal surfaces, the equivalent values were 90.6 and 75.3%. At the D(3) threshold for occlusal surfaces, the mean specificity and sensitivity were 92.8 and 63.1%, and for approximal surfaces 94.2 and 58.3%, respectively. Mean intraexaminer reproducibility (Cohen's kappa) ranged from 0.78 to 0.81 at the ICDAS code > or =1 cut-off and at the ICDAS code > or =3 cut-off from 0.74 to 0.76. Interexaminer reproducibility was lower, ranging from 0.68 to 0.70 at the ICDAS code > or =1 cut-off and from 0.66 to 0.73 at the ICDAS code > or =3 cut-off. In conclusion, the validity and reproducibility of the ICDAS II criteria were acceptable when applied to primary molar teeth.

Matched MeSH terms: Tooth Crown/pathology

Tooth size and dental arch dimensions: a stereophotogrammetric study in Southeast Asian Malays

Al-Khatib AR, Rajion ZA, Masudi SM, Hassan R, Anderson PJ, Townsend GC

Orthod Craniofac Res, 2011 Nov;14(4):243-53.

PMID: 22008304 DOI: 10.1111/j.1601-6343.2011.01529.x

To investigate tooth size and dental arch dimensions in Malays using a stereophotogrammetric system.

Matched MeSH terms: Tooth Crown/anatomy & histology

Experimental determination of optimal force system required for control of anterior tooth movement in sliding mechanics

Sia S, Shibazaki T, Koga Y, Yoshida N

Am J Orthod Dentofacial Orthop, 2009 Jan;135(1):36-41.

PMID: 19121498 DOI: 10.1016/j.ajodo.2007.01.034

This study was designed to determine the optimum vertical height of the retraction force on the power arm that is required for efficient anterior tooth retraction during space closure with sliding mechanics.

Matched MeSH terms: Tooth Crown/pathology

The prevalence of enamel opacities in permanent teeth of 11-12 year-old school children in Kuala Lumpur, Malaysia

Yusoff N, Jaafar N, Razak IA, Chew YY, Ismail N, Bulgiba AM

Community Dent Health, 2008 Mar;25(1):55-8.

PMID: 18435236

To determine the prevalence, distribution, severity and treatment need of enamel opacities among 11-12 year-old school children in a fluoridated urban community.

Matched MeSH terms: Tooth Crown/abnormalities

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: Tooth Crown

Tooth mineralization stages as a diagnostic tool for assessment of skeletal maturity

Surendran S, Thomas E

Am J Orthod Dentofacial Orthop, 2014 Jan;145(1):7-14.

PMID: 24373650 DOI: 10.1016/j.ajodo.2013.09.007

The objective of this study was to determine whether dental calcification can be used as a first-level diagnostic tool for assessment of skeletal maturity.

Matched MeSH terms: Tooth Crown/growth & development; Tooth Crown/radiography

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