Overall dental maturity was studied semilongitudinally in a group of 248 healthy children born Helsinki 1968-73. In all, 738 orthopantomograms were taken these at ages 2.5-16.5 years. estimated by the method Demirjian and Goldstein, which is based on development seven left mandibular permanent teeth. The aim study to construct curves for Finnish compare their with that French-Canadian same method. more advanced maturation than (p < 0.01). boys advancement seen age 5-10 years girls 4-12 These...

Studies on the association between malocclusion and temporomandibular joint disorder (TMD) have reported conflicting results.To determine impact of orthodontic treatment symptoms TMD.At 12 years, 195 subjects fulfilled a questionnaire regarding TMD participated in an oral examination including preparation dental casts. The study was repeated at ages 15 32. occlusions were assessed by applying Peer Assessment Rating (PAR) Index. Associations changes PAR scores analysed with chi-square test. A...

The emergence of permanent teeth was studied in 187 Finnish children who had longitudinal records the all except third molars. Exact dates were known for about one teeth. Emergence ages remaining based on their presence and absence at clinical examinations. We calculated eruption tooth counts halfyear intervals. Ages corresponding to from 1 27 are also given. schedules presented, which show means, standard deviations, percentage distributions, expected serve as useful references dentistry,...

An unfavourable root–crown (R/C) ratio caused by short dental roots may result from a developmental deficiency, root resorption after orthodontic treatment, or trauma. In the assessment of shortening, subjective grading has often been used. For objective tooth measurements, varying materials and methods make results impossible to compare. This study used simple, method assess R/C (relative length) mature permanent teeth panoramic radiographs (PRGs), tested its reproducibility calculated mean...

The aim of the study was to evaluate capability caries‐related salivary tests and a test based on past caries experience (baseline DPS) select persons at high risk for caries. subjects (n = 122) were 12–17 years old beginning study. Caries registered samples taken annually during 3‐study period. 3‐year increment positively correlated baseline DPS (r 0.46, p &lt; 0.001), level mutans streptococci 0.30, 0.001) lactobacilli combined 0.39, negatively buffering capacity saliva =−0.22, 0.05)....

Sizes of horizontal wear facets maxillary anterior teeth were studied longitudinally from the primary dentition at age five to young adult 18 years. By a planimetric method, we calculated areas on dental casts taken ages five, ten, 14, and years 39 healthy, orthodontically untreated subjects with good morphological occlusion. For adults, also association between amount reported parafunctions, maximal bite force, salivary buffer capacity, flow rate, some cephalometric variables. Size all...

AbstractThe prevalences of subjective symptoms and clinical signs craniomandibular (CM) disorders, orofacial parafunctions, occlusal conditions were determined in a series Finnish children (n = 166). All first interviewed, then 156 them examined clinically. Fifty-two per cent the reported at least one symptom, 75% parafunctional habit. Clinical common but rarely severe accordance with Helkimo's dysfunction index (Di). Both number (p < 0.001) parafunctions 0.05) correlated index.

Structured Abstract Authors – Arponen H, Elf Evälahti M, Waltimo‐Sirén J Objective To explore the reliability of identification anatomic landmarks on lateral skull radiographs young unaffected individuals that has conventionally been used to diagnose pathologic relationships in craniovertebral junction. Material and Methods From Helsinki longitudinal growth study, 20 randomly selected were analyzed re‐analyzed by two examiners. Both located seven cephalometric based which five measurements...

Turner syndrome (TS) that is due to a total or partial lack of an X chromosome affects about 1 in 2000 girls. The characterized by short stature and gonadal dysgenesis. Its documented craniofacial features include retrognathic jaws, mandible, large cranial base angle. Our aim was find out whether the also has effect on pharyngeal airway space. We retrospectively analysed lateral cephalograms 35 TS subjects whose age ranged from 6.5 21 years healthy female controls matched for age. On those,...

Many methods are available for the grading of tooth wear, but their ability to assess progression wear over time has not been studied frequently. The aim was whether occlusal/incisal scale Tooth Wear Evaluation System (TWES) sensitive enough detection from 14 23 years age. A total 120 sets dental casts were gathered 40 people, whom impressions made at 14, 18 and years. TWES used loss clinical crown height throughout entire dentition. There a significant difference in scores between three age...

Using a planimetric method, the size of horizontal wear facets on maxillary anterior teeth was studied longitudinally in permanent dentition 35 subjects at ages 14, 18, and 23?years. The study had not previously undergone any orthodontic treatment Class I occlusion. We association between amount reported parafunctions maximal bite force. Total areas age groups 23 years were 29.5 mm2 (SD 11.4), 39.1 12.7), 45.0 13.0), respectively. total area increased significantly both from 14 to 18 (p...

To investigate the long-term (≥15 years) post-treatment (Tx) occlusal changes and outcome quality after Class II:1 Tx.Herbst-MBA Tx had been performed at age 12.8 ± 2.7 years in 119 patients. A recall was conducted study models from before active Tx, retention as well were evaluated using standard variables PAR index. These data compared to 31 untreated I controls.52 out of patients could be located participated 33.6 3.1 years. Compared 67 who did not participate recall, pre- post-Tx...

Objectives: Children are especially vulnerable to harmful effects of ionizing radiation. Cutting down the dimensions X-ray beam is most effective way reduce patient dose. We evaluated appropriateness field-size in frequent radiographs, dental panoramic tomographs (DPTs) and lateral cephalometric radiographs (LCRs) among 7- 12-year-olds.

To investigate the outcome quality and long-term (≥15 years) post-treatment (Tx) changes after Class II:2 Herbst-multibracket appliance (MBA) Tx.In this longitudinal observational study, a recall of patients who had been treated by Herbst-MBA during adolescence was conducted. Study models from before active Tx, retention were assessed using standard occlusal variables peer assessment rating index (PAR). These data compared to historical untreated I controls.Twenty out 33 (61%) could be...

Abstract The timing of dental development in ethnic Finns and Somalis, who were born living Finland, was compared, with efforts to minimize environmental bias. developmental status seven lower left permanent teeth staged according Demirjian et al., using panoramic radiographs from 2,100 Finnish 808 Somali females males, aged 2 23 years. For each tooth, a continuation-ratio model constructed analyze the allocated stages as function sex origin. Several statistically significant differences...

This cross-sectional study compared tooth and dental arch dimensions of individuals with Osteogenesis imperfecta (OI) healthy controls.The 37 OI patients controls were aged 10 to 74 years. Mesio-distal size, dimensions, palatal height measured from models. The differences between the patient control groups analysed statistically a t-test, chi-square test, Mann-Whitney U test.The average mesio-distal size was smaller by 0.1 0.8 mm, corresponding 1.4 7.3% tooth. showed similar...

Background Biallelic mutations in the non-coding RNA gene RMRP cause Cartilage-hair hypoplasia (CHH), a rare skeletal dysplasia which main phenotypic characteristic is severe progressive growth retardation. Objective This study compared cranial dimensions of individuals with CHH to healthy subjects. Methods Lateral skull radiographs 17 patients (age range 10 59 years) and 34 54 were analyzed for relative position jaws base, craniofacial height depth, as well vertical pattern lower jaw,...