Curve Of Spee Research Articles

Leveling the curve of Spee using different sized archwires: a randomized clinical trial of blood flow changes

ObjectivesTo compare blood flow (BF) changes of teeth subjected to orthodontic forces during curve of Spee (COS) leveling using different archwires (AW).Material and methodsThirty subjects with COS > 5 mm were randomly assigned (1:1:1) into three groups based on the AW used: group 1: 0.017 × 0.025-inch stainless-steel (SS)AW, group 2: 0.019 × 0.025-inch SSAW, and group 3: 0.021 × 0.025-inch β-titanium (TMA)AW. In the 3 groups, a 5 mm-depth reverse COS was placed in the AWs. A laser Doppler flowmeter was used to measure BF at different time intervals (T0–T4).ResultsIn the 3 AWs group, BF of all measured teeth was reduced 20 min after force application. Afterwards, the BF values started to increase until the baseline values were almost restored within 1 week. Differences in BF changes between the extrusion and intrusion subgroups were observed within groups 1 and 3 during the first 20 min of force application (P < 0.05). Similar BF changes were recorded using the 3 different AWs. BF changes were associated with tooth type and the amount of COS depth change.ConclusionsDuring CoS leveling, similar BF changes were recorded using the 3 different AWs. Tooth type and the amount of COS depth change were associated with BF changes within the first 20 min of force application. Greater BF reduction was found in premolars compared to incisors during the first 20 min of AW placement.Clinical relevanceIt is important to select a type of applied forces that minimally affect the BF. Intrusive forces appeared to have lower negative effects on the BF of teeth during COS leveling.Trial registrationClinicalTrial.gov (# NCT04549948).

Investigation of the change in the degree of Frankfort mandibular plane angle after levelling the curve of spee in different malocclusion groups.

The curve of Spee is a naturally occurring phenomenon in the human dentition. Leveling the curve of Spee can affect the Frankfort-mandibular plane (FMP) Angle and thus the lower anterior facial height. This study examined the degree of change in FMP angle after leveling the curve of Spee in different malocclusion groups. In this study, 75 patients who were aged >14 years and had undergone fixed appliance therapy using a 0.022-slot MBT bracket system were included. The pre- and post-treatment casts and lateral cephalograms of the patients were divided into three groups, namely Class I, II, and III malocclusions, with 25 patients in each group. The curve of Spee and FMP angle were measured before and after orthodontic treatment, and their correlation was evaluated. After leveling the curve of Spee, the FMP angle decreased in Class I and II groups and increased in Class III group. These results were statistically significant except in Class I malocclusion group. A mild positive correlation was observed between the curve of Spee and FMP angle in Class I and III malocclusion groups and a negative correlation in Class II malocclusion group. The change in FMP angle, following the leveling of the curve of Spee, in Class II and III malocclusion group, is attributed to alterations in lower anterior facial height. The study observed a mild positive correlation between the curve of Spee and FMP angle in Class I and III malocclusion groups and a negative correlation in Class II malocclusion group.

Measuring curve of spee using digital methods and defining its relationship to different angle classes

Measuring curve of spee using digital methods and defining its relationship to different angle classes

The Effect of Leveling the Curve of Spee on the Inclination of Mandibular Incisors: A Retrospective Cephalometric Study.

To assess mandibular incisor inclination after leveling the curve of Spee (CoS) in patients treated with fixed appliances. This was a retrospective study, which included 80 consecutive patients with a mild CoS treated without extraction but with various biomechanical approaches. The depth of CoS was digitally measured on scanned plaster casts and mandibular incisor inclination was assessed with lateral cephalograms pre- and posttreatment. Patients were treated with 0.018"-slot edgewise fixed appliances and cinched back wires. Data were analyzed using linear regression modeling at 5%. A total of 80 patients (40% female; mean age 13.8 years) were included with mean ANB = 4.4 ± 1.9°, mean SN/ML = 31.7 ± 4.7°, mean L1/ML = 95.0 ± 7.7°, and a mean depth of CoS = 1.1 ± 0.4 mm. The depth of CoS was leveled by -0.85 ± 0.39 mm to a post-treatment median of 0.18 mm (interquartile range = 0.09 to 0.35 mm). A small mandibular incisor proclination was observed through treatment (2.49 ± 9.1°), but this was not associated with the reduction in the depth of CoS (p > 0.05) and no statistically significant modifying effect from the different treatment mechanics was observed. Under the limitations of this study, leveling a mild CoS was not associated with mandibular incisor proclination during fixed-appliance treatment.

Curve of Spee and Second Mandibular Premolar Agenesis—Present Knowledge and Future Perspectives

Background: We investigated the relationship between the mandibular Curve of Spee (COS) and a persisting primary second mandibular molar (ppM2) due to an agenesis of the second mandibular premolar, using a digital software technique. Methods: Digital dental casts were obtained from 200 patients at the Department of Orthodontics in Innsbruck and Vienna, Austria. Patients (age-, gender-, and malocclusion-matched) were equally divided into two groups (n = 100) according to the existence of a ppM2. COS depth, overjet, overbite, and angle-classification were measured digitally using the OnyxCeph3TM (version 3.2.147) software. ANOVA and Kruskal–Wallis tests were used to analyze relationships. For statistical analyses, p &lt; 0.05 was considered as statistically significant, p &lt; 0.01 as highly significant. Results were visualized with box plots and bar charts. Results: The deepest COS was present in patients with a ppM2. Furthermore, a positive correlation was shown between COS depth and angle-class II, between COS depth and age, as well as between COS depth and overbite. No gender differences could be observed. Conclusions: In our study population the COS depth was dependent on whether there is a ppM2 due to an agenesis of a second mandibular premolar or not, as well as on the malocclusion in sagittal direction.

Association of Craniofacial Patterns with the Curve of Spee and the Time Required for Orthodontic Levelling.

The curve of Spee (CoS) is an important parameter for an individualized treatment plan. The available information regarding a potential association of the depth of the curve of Spee with various skeletal craniofacial characteristics is conflicting and it is also unknown whether certain craniofacial parameters affect the duration of the levelling phase of orthodontic treatment. A prospective sample of 32 patients with mild to moderate crowding that underwent orthodontic treatment with full fixed appliances was used to study these topics. The craniofacial characteristics were captured on pre-treatment lateral cephalometric radiographs and measurements of the CoS were performed on the initial 3D digital dental models using the Viewbox 4 software. Non-parametric statistics and Spearman’s correlations were applied. Weak negative correlations were detected between the CoS depth and the SNA and SNB angles. There was no other association between the CoS and craniofacial parameters, including various anteroposterior measurements. Furthermore, there was no significant association of any craniofacial parameter with the duration of the levelling. Contrary to certain clinical beliefs, it can be argued that the craniofacial characteristics are not associated with the CoS and the time required for its levelling in subjects with moderate pre-treatment CoS depth.

Efficacy of lower arch leveling, lower incisors’ root resorption, and pain associated with the correction of curve of Spee using different orthodontic archwires: a randomized clinical trial

ObjectivesTo compare between 3 archwires (AWs) for leveling curve of Spee (COS) in terms of efficacy of reduction, external apical root resorption (EARR), pain experienced, and the lower arch dimensional changes during COS leveling.Trial designRandomized clinical trial.SettingJordan University of Science and Technology Postgraduate dental clinics.Material and methodsFifty-three subjects with COS > 5 mm were included in this study. The subjects were randomly divided into three groups based on the AW used: group 1, 0.017 × 0.025-inch stainless-steel (SS) AW; group 2, 0.019 × 0.025-inch SS AW; and group 3, 0.021 × 0.025-inch β-titanium (TMA) AW. The intervention was randomly allocated using the permuted random block size of 3 with a 1:1:1 allocation ratio. In the three groups, a 5-mm depth reverse COS was placed in the AWs. The following time points were defined for COS assessment: T1, before interventional leveling AW placement; and T2–T7, 1–6 months after interventional leveling AW placement. Records consisted of dental study models and periapical (PA) radiographs. Pain scores were recorded using visual analogue scale. Patients were followed up on a monthly basis until COS < 1.5 mm.Main outcome measuresCOS depth reduction, lower incisors’ EARR, pain scores, and arch dimensional changes.ResultsAn overall reduction of 3.82 mm, 4.47 mm, and 3.85 mm of the depth of COS was achieved in groups 1, 2, and 3, respectively. The mean differences of 0.65 mm between groups 1 and 2 and 0.62 mm between groups 2 and 3 were significant at P < 0.05. Lower incisors’ EARR during leveling COS ranged from 0.68 to 0.72 mm, from 0.63 to 0.82 mm, and from 0.53 to 0.88 mm in groups 1, 2, and 3, respectively (P > 0.05). Higher pain scores were reported by group 2 subjects during the first 24 h. Arch length and width increased significantly in groups 2 and 3 (P < 0.05). In all groups, COS leveling was achieved by lower incisor intrusion and proclination and lower molar extrusion.ConclusionsAll investigated AWs were effective in leveling COS with minimal lower incisors’ EARR (< 1 mm). COS was leveled by lower incisors’ intrusion and proclination and lower molar extrusion. Pain scores were the highest in group 2 during the first 24 h.Clinical relevanceThe 3 investigated leveling AWs were effective for the leveling COS and at the same time safe on the roots of the lower anterior teeth.

Leveling the curve of Spee: Comparison between continuous archwire treatment and Invisalign system: A retrospective study

The purpose of this study was to evaluate and compare leveling of the curve of Spee (COS) achieved by traditional fixed appliances and Invisalign clear aligners (Align Technology, Santa Clara, Calif). This retrospective study involved 2 groups of subjects with an increased COS depth. Patients treated with the Invisalign system (I group) and patients treated with the standard edgewise full-fixed appliance (Fgroup). The I group included 30 subjects (13 males, 17 females; mean age, 24 years 5 months ± 19 months). The F group included 32 subjects (12 males, 20 females; mean age, 22 years 4 months ± 21 months). The 2 groups were matched for sex, age, vertical pattern, and observation period. Pretreatment (T0) and posttreatment (T1) lateral cephalograms were analyzed. COS depth was measured on digital dental casts. The intragroup variation between T0 and T1 was analyzed with a paired t test. The intergroup variation was evaluated using an unpaired t test. The leveling of COS was statistically significant, comparing T0 and T1 within the groups. The F group presented a statistically significant extrusion of posterior teeth, with a flaring of the mandibular incisors. The I group showed a statistically significant intrusion of the mandibular incisors, with excellent control in the proclination of incisors during the intrusion movement. Traditional continuous archwire treatment and the Invisalign system effectively level the COS.

Assessing the Curve of Spee in Permanent Dentition in Class I, II, III Malocclusions and its Relation with Overjet and Overbite

Introduction: The curve of spee is very important in complete oral reconstructions and can be used as a reference for prosthetic and orthodontic reconstructions. This study assessed the curve of spee in the maxilla and mandible and its relationship with the overjet and overbite in class I, II, and III malocclusions in Iranian population. In this descriptive cross- sectional study, 75 pairs of dental casts with permanent dental system and having second molars, available in the clinic of Khorasgan Azad University and private orthodontic offices were selected and divided into three groups of 25 based on malocclusion I, II, and III.&#x0D; Materials &amp; Methods: In this descriptive cross- sectional study, 75 pairs of dental casts with permanent dental system and having second molars, available in the clinic of Khorasgan Azad University and private orthodontic offices were selected and divided into three groups of 25 based on malocclusion I, II and III. The radius and depth of curve of spee were obtained. Radius of the curve of spee, the tip of canine cusps, the mesiobuccal of the first molars, and the distobuccal cusps of the second molars were joined together in the form of an arch. To measure the depth of curve of spee, the reference plan was drawn from buccal canine cusp to distobuccal cusp of the second molars. The perpendicular lines were drawn from this line to the edge of the premolars cusp, the first molar and the second molar mesiobuccal cusp and the deepest part was regarded for the measurements. Overjet was measured as an average of 6 upper anterior teeth and overbite as an average of 4 anterior lower teeth and the values of radius and depth of horseshoe curvature and overbite and overjet values were analyzed by One-way ANOVA and Tukey test and Correlation between data was also examined by Pearson correlation coefficient test (p value = 0.05).&#x0D; Results: In class II malocclusion, overbite values had a significant relationship with radius (p value = 0.02) and depth of the curve of spee (p value = 0.04), in class III malocclusion, overbite values had a significant relationship with the curve of spee (p value = 0.001) had. In class II malocclusion, the curve of spee was deeper and overbite values were higher, and also in the class III malocclusions, a direct relationship existed between the curve of spee and overbite&#x0D; Conclusion: Curve of spee effects the values of overjet and overbite, and the presence of increased overbite results from a deep spee curvature.

The predictability of the mandibular curve of Spee leveling with the Invisalign appliance

The purpose of this study is to provide an initial investigation into the predictability and characteristics of the mandibular curve of Spee (COS) leveling using the Invisalign appliance (Align Technology, Santa Clara, Calif) and any regions of ineffectiveness in the dental arch. This study used a retrospective sample of patients treated by a single experienced Invisalign provider in private practice. All adult patients with Class I or II Angle malocclusions treated using a minimum of 14 Invisalign aligners without intermaxillary elastics, bite ramps, or auxiliaries and a nonextraction mandibular arch from 2013 to 2019 in the practice were selected. Dental models at the initial scan, the ClinCheck prediction, and the actual outcome were analyzed with Geomagic Control X software (version 2017.0.3; 3D systems, Rock Hill, SC). The COS and extrusion of posterior teeth relative to the occlusal plane were measured and compared. Forty-two subjects met the selection criteria. ClinCheck predicted 0.55 mm (P< 0.0001) more COS leveling than the actual outcome. The mean COS leveling accuracy using Invisalign was 35%, and ClinCheck overestimated the leveling in 86% of the patients. The first molars had the lowest accuracy and extrusion relative to the occlusal plane. To achieve desired clinical treatment goals, there should be a prescribed overcorrection of the mandibular COS leveling within the ClinCheck treatment plan, and the extrusion of mandibular first molars should be a region of focus. The clinician should consider using auxiliary appliances to improve mandibular COS leveling.

Is there variation in the depth of the curve of Spee in individuals with different dentoskeletal patterns? A systematic review with meta-analysis.

To systematically evaluate all the evidence assessing variations in the depth of the curve of Spee (COS) according to the presence/absence of different dentoskeletal characteristics. The eligibility criteria were outlined following the PECO framework, as follows: studies evaluating individuals with complete permanent dentition including second molars (P), which compared a group with a certain dentoskeletal variation (E) versus another group without the variation (C), regarding the depth of the COS (O). MEDLINE (via PubMed), Scopus, Web of Science, The Cochrane Library, LILACS and BBO (via Virtual Health Library), OpenGrey, and Google Scholar were searched up to September 2021 to identify eligible reports. Duplicates were removed from all the records retrieved. The selection process and data collection were performed independently by two review members. The risk of bias was also assessed independently and in duplicate, using the guideline described by Fowkes and Fulton. Several meta-analyses (α = 0.05) were conducted to estimate the mean differences (MD) or standardized mean differences (SMD) in the depth of COS between individuals presenting or not certain dentoskeletal characteristics. The certainty of evidence was assessed using the GRADE tool. Thirty-five studies were selected for qualitative synthesis, and 29 of them for quantitative synthesis. All studies had methodological limitations that affected the risk of bias and increased the likelihood that results were due to chance. Syntheses showed that Class II malocclusion (SMD = 0.87; 95% CI: 0.61, 1.13; P &lt; 0.00001; six datasets including 260 subjects analysed), Class II division 1 (SMD = 1.09; 95% CI: 0.62, 1.56; P &lt; 0.00001; 14 datasets including 823 subjects analysed) and Class II division 2 (SMD = 2.65; 95% CI: 1.51, 3.79; P &lt; 0.00001; eight datasets including 476 subjects analysed) had deeper COS than Class I malocclusion. The skeletal Class II also presented higher COS values than skeletal Class I (SMD = 0.57; 95% CI: 0.02, 1.12; P = 0.04; four datasets including 299 subjects analysed). Individuals with Class III malocclusion had flatter COS than the subjects having Class I malocclusion (SMD = -0.57; 95% CI: -1.07, -0.08; P = 0.02; nine datasets including 505 individuals analysed). No difference was shown in the COS depth between skeletal Class III and Class I (P &gt; 0.05). Deep bite individuals had higher COS depth than those with normal overbite (MD = 0.61; 95% CI: 0.41, 0.82; P &lt; 0.00001; two datasets including 250 subjects analysed). In addition, hypodivergent individuals presented deeper COS than normodivergents (SMD = 0.62; 95% CI: 0.37, 0.86; P &lt; 0.00001; six datasets including 305 subjects analysed), and there was no significant difference in the COS depth between hyperdivergent and normodivergent individuals (P = 0.66). The certainty of evidence was rated as very low for all the syntheses. All the quantitative syntheses included results from studies with methodological flaws. Therefore, they are potentially biased. Moreover, the evidence was also mainly affected in terms of the inconsistency of the results and the imprecision of the estimates. Although an apparent influence of dentoskeletal Class II, Class III malocclusion, deep bite, and the hypodivergent skeletal pattern on the depth of the COS is suggested, it is not possible to make definitive conclusions on the matter due to the very low certainty of the evidence. Further high-quality research is necessary.

Balkwill’s angle, occlusal plane, mandibular shape, and curve of Spee

ABSTRACT Objective This study proposes a cephalometric method to determine an individual radius of the curve of Spee in cases of occlusal prosthetic rehabilitation. Methods A retrospective study was conducted on 469 lateral cephalograms. Statistical analysis was performed. Correlations were computed using simple regression, Z tests, paired t-tests, and one-way repeated measures ANOVA. Results Regression calculations supported a link between the radius of the curve of Spee and occlusal plane inclination, Balkwill’s angle, mandibular parameters (MP), with MP = corpus – ramus + Bonwill height. Based on MP, data that are accessible even in the absence of teeth, a regression formula can be proposed to provide an individualized estimation of the radius of the Spee curve (RCS): RCS = 0.624 * MP + 26.583. Conclusion This study proposes an individualized estimation of the RCS from only skeletal mandibular parameters: the length of the ramus, length of the corpus, and the Bonwill height.

Research on Correlation between Spee Curve Depth and Malocclusion, Overbite and Overjet

To study the relationship between the depth of the curve of spee (COS) and different Angle classifications of malocclusion, overbite, overjet. The dental 3D models of 200 patients with malocclusion were selected as samples from Shenzhen Stomatology Hospital (Pingshan) of Southern Medical University from January 2021 to October 2022,Data are expressed as mean ± standard deviation (SD). SPSS 26.0 statistical software was used to conduct statistical analysis. The depths of the COS in the different categories of malocclusion, overbite, and overjet were compared by One-way analysis of variance (ANOVA) of the Duncan method. The correlation between the depth of the COS and dental diseases, including malocclusion, overbite, and overjet was analyzed by Pearson correlation analysis.Results. There was statistically significant difference between different types of Angle's classification ,overbite, overjet in the depth of COS.There was correlation between the depth of COS and overbite ,overjet of front teeth, overjet showed the highest correlation with the depth of COS.

The curve of Spee and its levelling in different vertical skeletal patterns: A 3D set-up study

Primary: to compare intra-arch measurements [Curve Of Spee (COS) depth, space required to level the COS (δ), uprighting angles of 1st and 2nd lower molars (αM1 & αM2), respectively] between different vertical skeletal patterns. Secondary: to explore the relationship between those measurements in each vertical skeletal pattern. 90 Plaster models were scanned and transformed into digital models using 3Shape Ortho System™ intra oral scanner. COS depth, (δ), αM1 & αM2 were measured on digital models using 3Shape Ortho Analyser™ software. The latter was used to achieve the virtual set-up. The sample was dividied into 3 groups according to the vertical skeletal pattern which was identified by measuring the FMA˚ angle (Frankfort mandibular plane) on a lateral cephalogram using Dolphin imaging software. The deepest COS was present in the hypodivergent group (P-value=0.001). No difference for the additional arch space required to level the COS (δ) between different vertical skeletal patterns (P-value=0.063). αM2 is the same in all 3 groups, whereas αM1 is greater in normodivergents compared to hyperdivergents (P-value=0.012). A positive correlation exists between the deepest point of the COS and the uprighting angles, αM1 and αM2. No correlation between (δ) and the different parameters evaluated (deepest point of the COS, αM1 and αM2). Additional arch space required to level the COS presented no correlation with the vertical skeletal pattern. Levelling the lower arch was carried out by extrusion of the premolars and uprighting of the posterior teeth; confirming that well-planned orthodontic mechanics can minimize side effects (flaring of the lower incisors) encountered during treatment.

Cone-beam Computed Tomography Analysis of the Relationship between the Curve of Spee and the Collum Angle of Mandibular Anterior Teeth

To evaluate the correlation between the curve of Spee (COS) of a patient and the Collum angle of mandibular anterior dentition using cone-beam computed tomography (CBCT). This cross-sectional study was based on the analysis of 100 CBCTs of patients divided sagittally into two separate subjects. The Collum angles of the mandibular central incisor, mandibular lateral incisor, and the mandibular canine were measured along with the COS of that quadrant using Dolphin Imaging. A multivariate linear regression and Pearson correlation coefficients were conducted to measure the correlation between the COS and the Collum angle of mandibular anterior dentition. The total number of participants in the cohort was 200 samples out of 100 patients as this was a split mouth study. The mean COS was 2.09 ± 1.239 mm. The mean Collum angle of the mandibular central incisor (L1) was found to be 6.50 ± 3.002 degrees. The mean Collum angle of the mandibular lateral incisor (L2) was 7.19 ± 2.554 degrees and the mean Collum angle of the mandibular canine (L3) was 7.03 ± 2.907 degrees. There was a statistically significant moderate correlation between L1, L2, and L3 and the COS with the Collum angle of the mandibular central incisor most highly correlated to the COS (0.42), followed by the mandibular lateral incisor (0.35) and then the mandibular canine (0.30). There is a statistically significant low to moderate correlation between the COS and the Collum angles of the mandibular anterior dentition.

Craniofacial Evolution: From Australopithecus to Modern Man.

Through the analysis and evaluation of the size and morphology of teeth and jaws, it is possible to differentiate animal species including man, allowing the theory of human evolution to be established. Hominin evolution is characterized by two main features, the transition to bipedality and the increase in brain size. This had an important impact on the structure and function of the hominine skull. The aim of this article is to retrace the evolutionary steps that led to Homo Sapiens, the direct ancestor of modern man. For the following paper, scientific articles from Medline (PubMed) and Google Scholar database were used from 1929 to 2018. Hominid evolution is characterized by 2 main features, the transition to bipedality and the increase in brain size. The fossils found show that both trends have had an important impact on the morphology and function of the skull of modern man. The basicranial flexion and growth have led to the facial modifications typical of modern man. The main changes concern the mandibular evolution with the appearance of the chin, the formation of the Spee curve due to mandibular arch growth, the formation of the temporomandibular joint as a hinge joint with a sliding socket as the condyle and a better function and maximum efficiency than its predecessors thanks to respect for the divine proportions of the face. Knowledge of ontogenesis allows us to know the factors underlying human form and function, analyze and evaluate them in the clinical context.

Effect of the timing of second molar bonding on the duration of the mandibular arch levelling: a randomized clinical trial.

This study investigated the effect of the timing of second molar bonding on the time required for the levelling of the mandibular dental arch. Single-centre two-arm parallel randomized clinical trial using random permuted blocks. Allocation concealment was achieved through sealed envelopes. There was blinding in outcome assessment, but not of patient or operator. Thirty-six patients (12-18 years old) with mild to moderate crowding and fully erupted mandibular second molars were assigned randomly (1:1 ratio) in two groups. Group A started fixed orthodontic treatment by bracket bonding in both jaws. Initial wire was 0.014" NiTi. Lower second molar tubes were bonded at the time of 0.016" x 0.022" NiTi wire placement. Group B was same as Group A, but second lower molars were bonded at the first appointment. Placement of the 0.017" x 0.025" stainless steel wire in the mandibular arch was considered the primary endpoint of the trial, indicating the completion of the levelling phase. The days required from bonding to the endpoint comprised the main outcome. Non-parametric statistics were applied. There were two dropouts in each group. The compared groups had similar baseline characteristics regarding age, sex, overjet, overbite, space in the dental arch, average Curve of Spee (CoS), and maximum CoS. Group A tended to require more days for levelling (median: 203 days) than Group B (median: 168 days). However, this difference was not statistically significant (P = 0.128). From the tested occlusal factors, only initial overjet was found to be moderately associated with the days required to complete levelling of the mandibular arch (r = 0.45, P = 0.009). In the frame of the current study, the duration of the levelling phase of orthodontic treatment with fixed appliances was not affected by the timing of second molar inclusion in the appliance. Future research could aim in cases with deep CoS to generalize the present findings and in larger sample sizes.

Treatment of Serious Occlusal Instability Associated with Temporomandibular Disorders (TMDs) Through Implant and Dynamic Occlusal Schemes Rehabilitation. A Case Report

A case report of 35 years old male patient, partially edentulous with occlusal instability, Disc Displacement with Reduction (DDWR), Local Muscle Soreness (LMS) and Alteration of vertical dimension is presented. Rehabilitation was planned to achieve predictability of long-term treatment, providing static and dynamic occlusal stability. A therapeutic occlus ion with premature contact in the right premolar sector was planned. Implants and cemented/screwed crowns were used to obtain contacts in the molar area. The restoration of dynamic occlusal schemes was made by direct adhesive technique in the anterior sector and Curve of Spee (COS) compensation with temporary anchoring for molar inclusion was used. Patient presents objective and subjective improvements associated with the treatment performed. Temporomandibular disorder is stabilized and controlled by a specialist.

Evaluation of relationship between curve of spee and temporomandibular joint symptoms in patients referred to Occlusion section of Prosthodontics department of Mashhad Dental School

Evaluation of relationship between curve of spee and temporomandibular joint symptoms in patients referred to Occlusion section of Prosthodontics department of Mashhad Dental School

Genetic influence on the curves of occlusion in children seeking orthodontic treatment

To examine the proportion of variability in the Curve of Wilson (COW) and the Curve of Spee (COS) that is explained by genetic factors in siblings seeking orthodontic treatment. Pre-treatment cone-beam computed tomography (CBCT) of 148 sibling patients were selected. The sample consisted of 79 females and 69 males with a mean age of 12 years 7 months. The COS was measured by creating a tangent line from the distobuccal cusp of the mandibular first molars and the highest incisal tip of the mandibular incisors. Measurements were taken from that tangent line to the deepest point on the premolars and canines. The COW was measured using the molar axis line to the perpendicular to WALA (Will Andrews Lawrence Andrews) points' axis line. The results indicate that these occlusal curves are generally moderate to highly heritable. Heritability of COW-maxilla was 78.3%, heritability of COW-mandible was 43.2% and heritability of COS was 100% (P-value<0.05). Most of the developmental variability in the curves of occlusion comes from genetic differences, with very little contribution from environmental factors. Therefore, siblings tend to show similar occlusal curves.