Statistical shape analysis of maxillary palatal morphology in patients with palatally displaced canines (original) (raw)
Related papers
Evaluation of palatal dimensions in different facial patterns by using digital dental casts
Dental Press Journal of Orthodontics
Objective: To analyze the variations of hard palate volume in adults with normal occlusion and different facial types and patterns, by using a three-dimensional analysis on digital casts. Methods: The dental casts of 70 Caucasian adults (28 men, 42 women), mean age of 16.4 years (SD 1.3 years), were scanned by using a tridimensional scanner (Delcam PowerSHAPE™, 2010, Birmingham, UK). Close points were selected in the gingival and cervical regions on the lingual surface of the maxillary teeth, to analyze palatal morphology. The facial patterns and types, and the measurements (width, length, height, volume) of the space on the hard palate were compared using analysis of covariance (ANCOVA), with age as the covariate, and sex as the independent variable. The significance level of 5% (p < 0.05) was adopted. Results: This study showed that the measurements of the width and length were similar among the mesofacial, dolichofacial and brachyfacial facial types, although the height and vo...
From earlier studies, it is known that dentitions featuring PDC (palatally displaced canine) showed various anomalies such as peg shaped and missing laterals incisors, other missing teeth and spaced dentitions. These anomalies which have associated genetic origin have similar association with PDC. In dentitions featuring PDC, reduction in tooth size, particularly lateral incisors was recorded. A recent Study was done in Israel to investigate the connection between palatal canine displacement and tooth size reduction in other teeth in maxilla. The present study was done to put this study into Indian context within Mysore population. The records of patients attending Farooqia Dental College were collected. The diagnosis was made on basis of clinical examination and standardized radiographs. Bilateral and Unilateral Subjects were analysed using study model casts for measuring the M-D and B-L dimensions of the maxillary dentition using a Digital Vernier Calliper. The mean B-L width of all maxillary teeth in PDC subjects were significantly smaller by approximately 0.5 mm than in the control group. The B-L width of Lateral incisors was found to be significantly smaller for PDC subjects which was statistically significant. There was a distinct trend towards narrower teeth in the PDC group which was statistically significant for the maxillary first premolar and first molar. Based on the results of the study it can be safely assumed that the results can be applied to Indian context. The tooth size variation information can be used as an additional diagnostic tool in clinical settings to determine the position of the canine in canine displacement cases.
Palatal displacement of canines and maxillary skeletal width
American Journal of Orthodontics and Dentofacial Orthopedics, 2006
The purpose of this study was to determine whether a clinically significant association exists between maxillary skeletal width and palatal canine impaction, also known as palatally displaced canine (PDC). Methods: Seventy-nine patients with PDC were matched for age, sex, and malocclusion to 79 controls. Maxillary and mandibular skeletal widths and nasal cavity widths were measured on posteroanterior cephalograms; maxillary and mandibular intermolar widths were measured on dental casts; and maxillary interalveolar arch widths at 3 levels (canine, premolar, and first molar) were measured on occlusograms. Results: Only maxillary alveolar arch width at the canine level was significantly different between the 2 groups. However, further analysis showed that the presence of erupted deciduous or permanent canines, rather than their absence in the canine area (whether due to extraction, exfoliation, impaction, or not yet having erupted), was strongly associated with maxillary intercanine alveolar arch width. Conclusions: The additional finding in this study that the eruptive status of canines significantly affects maxillary alveolar arch width in this area suggests that maxillary intercanine alveolar arch width as measured in this or other studies is not a good predictor of PDC.
Palatal dimensions in different occlusal relationships
Background: This study aimed to compare the palatal dimensions in different occlusal relationships and to find out the genders difference in each relationship. Materials and methods: The sample consisted of 60 sets of dental casts for 60 dental students and patients attending the Orthodontic Department in the College of Dentistry, University of Baghdad. These casts divided into three groups according to the Angle's classification: Class I group: included casts of subjects had Class I normal occlusion and consisted of 10 males and 10 females. Class II Division 1 group: included casts of subjects had Class II Division 1 malocclusion and consisted of 10 males and 10 females. Class III group: included casts of subjects with Class III malocclusion and consisted of 10 males and 10 females. The palatal dimensions were measured using digital vernier and palatometer. Descriptive statistics were performed to each gender and to both genders in each class. Inferential statistics included independent sample t-test to find out the presence of genders difference and ANOVA then LSD tests to show the classes differences in each gender and in the total sample. Results and Conclusions: The results showed that Class I and II males had the largest palatal dimensions than females while Class III females had the largest palatal dimensions than males. Class I subjects had the largest palatal width and depth while Class II subjects had the largest palatal length. Class I males and Class III females had the largest palatal width than other classes. Class III females and Class II males had the largest palatal depth than other classes. Key words: palatal dimension, occlusal relationships. (J Bagh Coll Dentistry 2012;24(1):116-120).
International orthodontics, 2017
Cephalometric and arch measurements might predict the occurrence of a palatally-displaced impacted maxillary canine (PDC). Despite their clinical importance, studies in this regard are limited and controversial. In this case-control study, 35 PDC patients and 77 controls aged over 13 years were examined. Eleven cephalometric measurements: N-S, ANS-PNS, ANS-N, S-N-ANS, facial angle (FH/NPog), SNA, SNB, Y-axis (SN/SGn), gonial angle, Go-Gn/SN, and Jarabak Index were performed. The maxillary and mandibular intermolar and interpremolar widths were measured. Patients' sagittal skeletal relationships and centric occlusions (molar) were measured by radiographic and cast examinations. The differences between the two groups in terms of the above-mentioned cephalometric and anatomic variables were assessed using Chi(2) and Mann-Whitney U-tests (α=0.05). Chi(2) showed a significant negative association between dentoalveolar class I (molar) and PDC occurrence (P=0.018), but not between PDC ...
Maxillary tooth size variation in dentitions with palatal canine displacement
The European Journal of Orthodontics, 2002
The association between the presence of palatally displaced maxillary canines (PDC) and other anomalies is well known, particularly with regard to the size and form of the lateral incisor. The present study investigated the connection between the maxillary canine anomaly and the existence of a reduction in the size of the other teeth in the maxilla in 58 consecutively treated patients (37 females, 21 males) aged 11-15 years, and compared these with a control group of 40 consecutively treated subjects (20 males, 20 females) with normally erupted maxillary canines. The findings indicate that the teeth of PDC males are reduced in size and similar to those of PDC females, in sharp contrast to the general population, where males have larger teeth. This is the result of a dimensional reduction in the teeth of PDC males, which was statistically significant for all teeth (P < 0.01) in the bucco-lingual (B-L) dimension, and for the first premolars and first molars in the mesio-distal (M-D) dimension. The sole teeth affected for both sexes were the lateral incisors in their B-L dimension. Bilaterally and unilaterally affected subjects presented differing M-D and B-L tooth dimensions.
An osteological study of morphometry of hard palate and its importance
International Journal of Research in Medical Sciences, 2015
Hence the present study was performed to determine the palatine length, breadth, height, and palatine index and palatine height index. These data will be useful to surgeons, clinicians, anatomists and anthropologists. METHODS 65 adult skulls of unknown sex were procured from the department of anatomy, MVJMC & RH. With the help of ABSTRACT Background: The hard palate is an essential part of human skull, the detailed knowledge of which plays an important role in the passive articulation of speech. Methods: The present study was conducted on 65 dry skulls from the department of anatomy, MVJMC & RH, Bangalore. With vernier caliper, palatine length, palatine breadth and heights were measured. Palatine index and palatine height index were calculated. Results: Mean palatine length was 48.47 ± 4.66 mm. Mean palatine breadth was 36 ± 4.41 mm and height was 8.62 ± 2.76 mm. According to the palatine index range, 66% of the hard palate belongs to leptostaphyline, 18.5% belongs to mesostaphyline and 15. 5% was brachystaphyline. As per palatine height index, 72.3% of hard palate showed chamestaphyline followed by 26.1% orthostaphyline and 1.6% hypistaphyline. Conclusions: These observations can be utilised for ethnic and racial classification of crania, anthropological studies, fabricating complete maxillary dentures for edentulous patients and performing certain surgical procedures in hard palate & soft palate.
BMC Oral Health
Background: The goal of this study was to investigate in patients with unilateral palatally displaced canine (PDC) the morphology of maxillary teeth from cone-beam computed tomography (CBCT) scans both on the PDC side and non-PDC side using a "surface matching" technique. Methods: CBCT images from 28 patients (mean age 16.04 ± 1.77 years) with unilateral PDC were selected. Each tooth in this study was segmented and then rendered into a 3D model using Mimics Research software and the root length was measured. Afterwards, 3D deviation analysis between the PDC and non-PDC side was carried out using Geomagic Control X software. Results: Statistically significant differences (p ≤ 0.001) were obtained when comparing the root lengths and volumes of lateral incisors from the PDC side, non-PDC side and control group. In accordance with the findings of 3D deviation analysis, statistically significant differences between the patients and control group were obtained for the lateral incisors and canines (p ≤ 0.0001) and greater differences were found for the tooth crowns and root tips. Conclusions: Lateral incisors adjacent to PDCs have shorter roots than contra-lateral lateral incisors. Furthermore, there were morphological differences between lateral incisors and canines in subjects with unilateral PDCs.
The International journal of adult orthodontics and orthognathic surgery
A 10-year longitudinal evaluation of the morphology (size and shape) of hard tissue palate was performed in 6 female and 6 male healthy adults (mean age at the second evaluation was 33 years, SD = 2.2). All subjects had a complete permanent dentition, including the second molars, and were free from respiratory problems. Palatal landmarks were digitized with a computerized 3D instrument, and their coordinates were used to derive a mathematical model of palatal form. Palatal shape (size-independent) was assessed by a fourth-grade polynomial in the sagittal and frontal plane projections. Palatal dimensions in the frontal and sagittal planes were computed and compared between the 2 evaluations by paired Student t tests. A great variability was observed, and no significant modifications in size were found (P > .05 for all variables). No variations in shape were observed. Sex had no significant effect for any variable (Student t for independent samples, P > .05). This study showed t...