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Medical Science Monitor : International... Sep 2020BACKGROUND The proximity between the maxillary sinus and dental roots may impede orthodontic tooth movement. This study aimed to explore the relationship between the... (Clinical Trial)
Clinical Trial
BACKGROUND The proximity between the maxillary sinus and dental roots may impede orthodontic tooth movement. This study aimed to explore the relationship between the maxillary sinus wall (MSW) and maxillary canines and posterior teeth using cone-beam computed tomography (CBCT). MATERIAL AND METHODS CBCT images (317) were examined for whether the mesial, distal, buccal, and palatal surfaces of the examined root contacted the MSW, and the contact distance of each root surface with the MSW was measured. The effects of age and sex were analyzed using logistic regression and linear regression analyses. RESULTS The highest contact ratios with the MSW (ranging from 62.0% to 73.2%) were observed at the palatal root surfaces of the first molar mesiobuccal and distobuccal roots (1M MB and DB), the buccal root surface of the first molar palatal roots (1M P), and the mesial and buccal root surfaces of the second molars (2M), followed by the distal root surface of the second premolars (2PM) and the mesial root surfaces of the 1M MB and P (ranging from 49.2% to 59.3%). At these root surfaces, the contact ratios decreased with age (P<0.05), but the lowest still reached a range of 29.4% to 57.9% in the 30- to 47-year-old group. CONCLUSIONS The 2PM distal root surface, the 1M MB mesial and palatal root surfaces, the 1M DB palatal root surface, and the 1M P and 2M mesial and buccal root surfaces most frequently contacted the MSW. Clinicians should observe the contact of root surfaces with the MSW, even in aged patients.
Topics: Adolescent; Adult; Child; Cone-Beam Computed Tomography; Cuspid; Female; Humans; Male; Maxilla; Maxillary Sinus; Middle Aged; Tooth Root
PubMed: 32970652
DOI: 10.12659/MSM.925384 -
Australian Orthodontic Journal May 2010The dimensions of the roots of the teeth are important in the assessment of orthodontic anchorage and to estimate the forces to be used during orthodontic tooth movement.
BACKGROUND
The dimensions of the roots of the teeth are important in the assessment of orthodontic anchorage and to estimate the forces to be used during orthodontic tooth movement.
AIMS
To investigate the relations between the lengths, widths and projected areas of the roots of the permanent teeth.
METHODS
Intact, extracted human permanent teeth were photographed and the lengths, widths and projected areas of selected surfaces measured. Descriptive statistics and associations between selected linear dimensions and root areas were calculated.
RESULTS
The data showed significant kurtosis and skewness. Neither exponential nor polynomial transformations improved the goodness of fit, and there was no a priori reason to use other than linear regression. When the lengths of all teeth were multiplied by the respective widths of the mesial, distal and lingual surfaces, the correlations between the product of length and width and area improved in 28 out of 30 surfaces. In the lower arch the correlation coefficients ranged from r = .343 (mesial surface first premolar) to r = .845 (mesial surface of the canine). The correlations in the upper arch ranged from r = .201 (mesial surface of the second molar) to r = .847 (mesial surface lateral incisor).
CONCLUSIONS
For clinical purposes, root length may be an acceptable indicator of root area. Low correlations were attributed to variations in root shape.
Topics: Bicuspid; Cuspid; Humans; Incisor; Mandible; Maxilla; Molar; Odontometry; Orthodontic Anchorage Procedures; Orthodontic Appliance Design; Photography, Dental; Stress, Mechanical; Tooth Movement Techniques; Tooth Root
PubMed: 20575192
DOI: No ID Found -
International Journal of Clinical... Sep 2023To evaluate the thickness of the root canal dentin wall in the cervical, middle, and apical third of primary first molars.
AIM
To evaluate the thickness of the root canal dentin wall in the cervical, middle, and apical third of primary first molars.
MATERIALS AND METHODS
Cross-sectional study consisting of 30 cone-beam computed tomography (CBCT) images of primary maxillary and mandibular first molars, with crown, and root integrity. The wall dentin thickness of each canal was measured in three axial views, divided into distal (D), mesial, lingual/palatine, and buccal surfaces.
RESULTS
The smallest dentin wall thickness of the maxillary molar was located on the mesial surface of the mesiobuccal (MB) canal apical third (mean 0.55 ± 0.04 mm). The buccal and palatal (P) surfaces of the distobuccal (DB) and P canals showed the smallest dentin thickness on the cervical third (0.62 ± 0.02 mm). On the mandibular molar, we found the smallest dentin thickness on the apical third [lingual surface of the MB canal and buccal surface of the mesiolingual (ML) canal] with a mean of 0.41 ± 0.07 mm. Additionally, the dentin thickness is average of the D canal was about 0.67 ± 0.11 mm.
CONCLUSION
It is essential to understand the primary first molar's anatomy to reduce possible complications in pediatric patients from instrumentation during root canal treatments.
CLINICAL SIGNIFICANCE
Pulpectomy is among the most challenging procedures in pediatric dentistry and the knowledge of the root anatomy of primary teeth allows the professional to make better clinical decisions and reduce possible risks during root canal treatment.
HOW TO CITE THIS ARTICLE
Justiniano-Navarro C, Caballero-García S, López-Rodriguez G, Evaluating the Thickness of the Root Canal Dentin Wall in Primary First Molars using Cone-beam Computed Tomography. Int J Clin Pediatr Dent 2023;16(S-2):S122-S127.
PubMed: 38078037
DOI: 10.5005/jp-journals-10005-2660 -
Journal of Prosthodontics : Official... Apr 2018To evaluate the effect of different silica-based ceramic materials on the mechanical failure behavior of endocrowns used in the restoration of endodontically treated... (Comparative Study)
Comparative Study
PURPOSE
To evaluate the effect of different silica-based ceramic materials on the mechanical failure behavior of endocrowns used in the restoration of endodontically treated mandibular molar teeth.
MATERIALS AND METHODS
Thirty-six intact mandibular molar teeth extracted because of a loss of periodontal support received root canal treatment. The teeth were prepared with a central cavity to support the endocrowns, replacing the occlusal surface with mesial-lingual-distal walls. Data acquisition of the prepared tooth surfaces was carried out digitally with a powder-free intraoral scanner. Restoration designs were completed on manufactured restorations from three silicate ceramics: alumina-silicate (control), zirconia-reinforced (Zr-R), and polymer-infiltrated (P-I). Following adhesive cementation, endocrowns were subjected to thermal aging, and then, each specimen was obliquely loaded to record the fracture strength and define the mechanical failure. For the failure definition, the fracture type characteristics were identified, and further analytic measurements were made on the fractured tooth and ceramic structure.
RESULTS
Load-to-fracture failure did not differ significantly, and the calculated mean values were 1035.08 N, 1058.33 N, and 1025.00 N for control, Zr-R, and P-I groups, respectively; however, the stiffness of the restoration-tooth complex was significantly higher than that in both test groups. No statistically significant correlation was established in paired comparisons of the failure strength, restorative stiffness, and fractured tooth distance parameters. The failure mode for teeth restored with zirconia-reinforced glass ceramics was identified as non-restorable. The resin interface in the control and P-I groups presented similar adhesive failure behavior.
CONCLUSION
Mechanical failure of endocrown restorations does not significantly differ for silica-based ceramics modified either with zirconia or polymer.
Topics: Biomechanical Phenomena; Ceramics; Crowns; Dental Prosthesis Design; Dental Restoration Failure; Humans; In Vitro Techniques; Mandible; Materials Testing; Molar
PubMed: 27465810
DOI: 10.1111/jopr.12499 -
Acta Odontologica Scandinavica Nov 2022Identifying additional information obtained by X-rays combined with clinical examination concerning primary caries, caries adjacent to restorations and quality of...
OBJECTIVES
Identifying additional information obtained by X-rays combined with clinical examination concerning primary caries, caries adjacent to restorations and quality of restorations.
MATERIAL AND METHODS
A total of 240 adult patients, equally distributed in gender and six age-groups, were randomly selected from an original study population of 4,402 subjects (DANHES). Clinical and radiographical registrations on occlusal and approximal surfaces in posterior teeth were categorized into unrestored surfaces (sound/primary caries) and restored surfaces (without/with caries adjacent to restorations). Material and quality of restorations were also recorded. Chi-square and Fisher-exact tests were used for statistical analyses.
RESULTS
Of potentially 11,520 surfaces, 3,015 occlusal and 5,112 approximal surfaces were analysed. : Of 907 unrestored surfaces, 110 had primary caries and 53% were detected radiographically. A total of 183 of 2,108 restored surfaces had caries adjacent to restorations, and 99% were found radiographically. A total of 190 restorations were over/under-extended, and 89% were registered radiographically. Of 2,649 unrestored surfaces 648 had primary caries, and 92% were registered radiographically. A total of 565 of 2,463 restored surfaces had caries adjacent to restorations, and 99% were found radiographically. A total of 638 restorations were over/under-extended, and 98% were found radiographically. For all restorations, material and depth influenced quality of restorations and incidence of caries adjacent to restorations. At least one independent variable (gender/age group/tooth-type/jaw/side/mesial-distal surface) influenced frequencies of primary caries, caries adjacent to restorations and quality of restorations.
CONCLUSIONS
First-time clinical examination must be supplemented with X-rays to obtain a complete impression of caries status in posterior regions regarding diagnostics of caries, assessment of lesion depth and quality of restorations.
Topics: Adult; Humans; Dentition, Permanent; Dental Caries Susceptibility; Dental Caries; Tooth; Incidence; Dental Restoration, Permanent
PubMed: 35635186
DOI: 10.1080/00016357.2022.2055789 -
Journal of Conservative Dentistry : JCD 2020Application of adhesive systems on dentin is a multistep, technique-sensitive procedure. Thus, the aim was to assess the effect of operator experience on the shear bond...
AIM
Application of adhesive systems on dentin is a multistep, technique-sensitive procedure. Thus, the aim was to assess the effect of operator experience on the shear bond strength of an etch-and-rinse adhesive system and a self-etch adhesive system on dentin.
MATERIALS AND METHODS
Forty-eight extracted human molar teeth were used in the study. They were embedded in an acrylic resin after cutting off the roots. The mesial and distal enamels of the teeth were removed to expose dentin surfaces. The samples were allocated to four groups ( = 12): Group 1: restorative dentistry specialist with 13 years of experience, Group 2: with 6 years of experience, Group 3: postgraduate operator with 2 years of experience, and Group 4: undergraduate student with 1 year of experience and familiar with adhesive with systems. Each operator applied an etch-and-rinse adhesive system (Adper Single Bond 2) to mesial surface and a self-etch adhesive system (Clearfil SE Bond) to distal surface ( = 12). Then, a composite resin (Filtek Z250) was inserted with the aid of a plastic ring (2 mm × 2 mm) and light polymerized. The specimens were stored in distilled water before shear bond strength test. A two-way ANOVA test was used for statistical analysis.
RESULTS
No statistically significant difference was found between each operator type with respect to etch-and-rinse adhesive system ( > 0.05); however, the undergraduate student performed better than 2-year experienced operator with respect to self-etch system application ( < 0.05).
CONCLUSION
The shear bond strength of a self-etch system might vary according to the operator's experience.
PubMed: 33223638
DOI: 10.4103/JCD.JCD_47_19 -
Clinical Oral Investigations Dec 2017There is only sparse knowledge concerning the outcomes of treatments with posterior permanent restorations in general practice settings. This study aimed at evaluating...
OBJECTIVES
There is only sparse knowledge concerning the outcomes of treatments with posterior permanent restorations in general practice settings. This study aimed at evaluating outcomes based on a large dataset by using a novel approach on a tooth surface basis.
MATERIALS AND METHODS
The study based on routine data from a major German national health insurance company. Respective treatment fee codes allowed for tracking the clinical courses on a tooth surface level. The study intervention was defined as the placement of a restoration on an interproximal or occlusal posterior tooth surface regardless of its actual extension and material on which no information was available. All surfaces restored between January 1st, 2010 and December 31st, 2013 were included. Kaplan-Meier survival analyses were conducted to estimate four-year survival. The primary outcome was a restorative re-intervention on the same tooth surface. Separate analyses were performed for the secondary outcomes "crowning" and "extraction".
RESULTS
Over ten million interproximal surfaces and eight million occlusal surfaces in nine million posterior teeth had been restored. At 4 years, the cumulative survival rates concerning the primary outcome "re-intervention" for mesial surfaces (81.4%; CI 81.3-81.5%) and distal surfaces (81.2%; CI 81.1-81.2%) differed significantly from those for occlusal surfaces (77.0%; CI 76.9-77.0%). Restored surfaces in premolars showed significantly higher survival rates compared to molars. Four-year survival rates for the secondary outcome "crowning" were 91.9% (CI 91.8-91.9%) for mesial surfaces, 92.1% (CI 92.1-92.2%) for distal surfaces and 93.3% (CI 93.2-93.3%) for occlusal surfaces. The respective rates for the secondary outcome "extraction" were 94.5% (CI 94.5-94.5%) for mesial surfaces, 94.8% (CI 94.7-94.8%) for distal surfaces and 95.4% (CI 95.4-95.5%) for occlusal surfaces.
CONCLUSIONS
Re-interventions after restorative treatment play a significant role in general practice settings. Surface-related survival rates of restorations reveal a need for improvement.
CLINICAL RELEVANCE
This study allows the estimation of the probability of re-interventions after restoring posterior tooth surfaces. It is based on several million cases from general practises under the terms and conditions of a national health insurance system.
Topics: Data Mining; Dental Restoration Failure; Dental Restoration, Permanent; General Practice, Dental; Germany; Health Services Research; Humans; Insurance, Dental; Retreatment; Survival Rate; Treatment Outcome
PubMed: 28246897
DOI: 10.1007/s00784-017-2084-4 -
American Journal of Orthodontics and... Jan 2017The aim of this study was to investigate the effects of casein phosphopeptide-amorphous calcium phosphate (CPP-ACP) application after interproximal stripping on enamel...
INTRODUCTION
The aim of this study was to investigate the effects of casein phosphopeptide-amorphous calcium phosphate (CPP-ACP) application after interproximal stripping on enamel surface structures in vivo.
METHODS
Fifteen patients with a mean age of 15.8 years participated in this study. For each patient, the extraction of 4 first premolars was part of the orthodontic treatment plan. The patients were randomly divided into 5 groups of 3 patients. With the exception of group 1, the mesial and distal surfaces of all first premolars were stripped with a stripping disc (Komet; Gebr Brasseler, Lemgo, Germany) under air cooling and then polished with Sof-Lex polishing discs (3M Dental Products, St Paul, Minn). In group 1, no stripping was performed, and the teeth were removed immediately. In group 2, the teeth were removed immediately after the stripping. In group 3, the stripped teeth were extracted after exposure to oral conditions for 3 months. In groups 4 and 5, CPP-ACP (Recaldent Tooth Mousse; GC Europe, Leuven, Belgium) or fluoride varnish (Bifluoride 12; Voco, Cuxhaven, Germany) was applied to the stripped surfaces for 3 months, respectively, before the teeth were extracted. Surface roughness and microhardness values were evaluated with 1-way analysis of variance and Tukey HSD tests.
RESULTS
The CPP-ACP and the fluoride varnish applications increased the surface roughness and microhardness values that had been decreased by stripping. No statistically significant differences were found between groups 3, 4, and 5 for microhardness or between groups 4 and 5 for surface roughness (P > 0.5).
CONCLUSIONS
The saliva and saliva plus remineralizing agents (fluoride varnish and CPP-ACP) increased the microhardness and surface roughness values of stripped enamel surfaces that had been decreased by stripping.
Topics: Adolescent; Caseins; Dental Enamel; Female; Humans; Male; Malocclusion, Angle Class I; Microscopy, Electron, Scanning; Orthodontic Anchorage Procedures; Orthodontics, Corrective; Tooth Remineralization
PubMed: 28024772
DOI: 10.1016/j.ajodo.2016.06.033 -
Oral Surgery, Oral Medicine, Oral... Apr 2005This in vitro study evaluated increases in root surface temperature during the continuous wave of condensation technique using a System B HeatSource.
OBJECTIVES
This in vitro study evaluated increases in root surface temperature during the continuous wave of condensation technique using a System B HeatSource.
STUDY DESIGN
Forty-five extracted human teeth (15 maxillary central incisors, 15 mandibular central incisors, and 15 maxillary canines) were used. After root canal cleaning and shaping, the teeth were filled with the continuous wave of condensation technique using a System B HeatSource. Temperature changes on the whole mesial and vestibular outer surfaces of the roots were measured using an infrared thermal imaging camera.
RESULTS
The results of this in vitro study showed that the use of the continuous wave of condensation technique to fill the maxillary central incisors and maxillary canines produced temperature rises below the critical level. In the mandibular central incisors the use of a System B HeatSource resulted in elevation of the root surface temperature by more than 10 degrees C.
CONCLUSION
The continuous wave of condensation technique using the System B HeatSource produces temperature changes on the outer root surfaces, which, in the case of teeth with relatively thin dentinal walls, can reach relatively high values.
Topics: Body Temperature; Cuspid; Hot Temperature; Humans; Incisor; Infrared Rays; Root Canal Obturation; Statistics, Nonparametric; Thermography; Tooth Root
PubMed: 15772602
DOI: 10.1016/j.tripleo.2004.07.014 -
BMC Oral Health Aug 2021Optimal utilization of dental caries data is crucial in epidemiological research of individuals with juvenile idiopathic arthritis (JIA). The aims were to: explore...
BACKGROUND
Optimal utilization of dental caries data is crucial in epidemiological research of individuals with juvenile idiopathic arthritis (JIA). The aims were to: explore whether caries is more prevalent among children and adolescents with JIA compared to controls; examine presence of caries according to JIA group, socio-behavioral and intraoral characteristics, and the extent to which surface-specific caries varies between and within individuals; assess whether surface-specific caries varies according to JIA group and dentition; and investigate whether disease-specific clinical features of JIA are associated with presence of caries.
METHODS
In this comparative cross-sectional study, calibrated dentists examined index teeth (primary 2. molars, 1. permanent molars) of 4-16-year-olds with JIA (n = 219) and matched controls (n = 224), using a detailed caries diagnosis system (including enamel caries). JIA-specific characteristics were assessed by pediatric rheumatologists and socio-behavioral information collected by questionnaires. Multilevel mixed-effect logistic regressions reporting odds ratios (OR) with 95% confidence interval (CI) were applied (caries at surface level as outcome variable). Potential confounders were adjusted for, and the effect of dependency of surface-specific caries data was estimated by calculating intra-class correlation coefficients (ICC).
RESULTS
At individual level, no significant difference in caries prevalence was found between individuals with JIA and controls, regardless of inclusion of enamel caries. Proportion of enamel lesions exceeded dentine lesions. JIA was not associated with presence of caries, but in both groups, low maternal educational level was associated with presence of caries (OR: 2.07, 95% CI: 1.24-3.46). Occlusal and mesial surfaces, compared to buccal surfaces, had generally higher OR according to presence of caries than distal and lingual surfaces (ICC = 0.56). Surface-specific caries in the permanent dentition differed significantly according to group affiliation. Some JIA disease-specific variables were suggested to associate with presence of caries.
CONCLUSIONS
No overall difference in caries prevalence between individuals with JIA and controls was observed, but for both groups, low maternal educational level and tooth surface associated with presence of caries. Associations between JIA disease-specific variables and presence of caries cannot be excluded. Due to predominance of enamel lesions, the potential of preventative dental strategies is considerable.
Topics: Adolescent; Arthritis, Juvenile; Child; Cross-Sectional Studies; Dental Caries; Dentition, Permanent; Humans; Multilevel Analysis; Tooth, Deciduous
PubMed: 34433437
DOI: 10.1186/s12903-021-01758-y