Proportion Of Teeth Research Articles

Adoption and Effect of Sealants for Occlusal Noncavitated Caries in a Large Dental Network in the USA.

Dental sealants applied to occlusal pit-and-fissure surfaces have been shown to prevent caries and arrest occlusal noncavitated carious lesions (NCCLs). The American Dental Association (ADA) recommends that oral healthcare providers apply sealants on occlusal NCCLs. Though the evidence is clear that sealants are effective, few studies have examined the adoption of the ADA guideline by dentists and the duration of protection provided by sealants in a large real-world setting. This study used observational electronic health record (EHR) data from a network of dental clinics to follow teeth over a 2 year time period from when they were diagnosed as having an occlusal NCCL until either they were treated with a restoration or the time period ended with no restoration. The objectives of the study were to determine: (1) the degree to which dentists adopted the guideline, (2) whether the duration of protection was different for teeth that received a sealant from teeth that did not receive a sealant, and (3) whether dentists' experience placing sealants was associated with the duration of protection. Overall, there were 7,299 teeth in the sample. Of those, dentists restored 591 teeth and applied sealants on 164. The sealant application rate for eligible teeth was 2.2%. Sealant application was associated with provider, with 1.9% of providers placing more than half of the sealants. By the end of the observation period, the proportion of teeth progressing to restorations was 8.2% for teeth that had not received a sealant and 3.0% for teeth that had received one (RR = 0.37; 95% CI: 0.16-0.88; p = 0.02). Multilevel survival analysis showed that teeth that had not received a sealant were restored sooner than teeth that had received a sealant (aHR = 0.11; 95% CI: 0.03-0.36; p < 0.01). Overall, teeth that received a sealant had an 89% reduced hazard of restoration within 2 years compared with teeth that did not receive sealants. This study found that by arresting decay, the presence of sealants led to fewer restorations and delayed restorations compared with teeth not receiving a sealant or restoration in the 2 years following diagnosis of occlusal NCCL in clinical settings.

Effect of the Time Interval of Functional Loading on the Periapical Healing of Endodontically Treated Mandibular Molar Teeth with Pulp Necrosis and Asymptomatic Apical Periodontitis: A Split-mouth Randomized Clinical Study

IntroductionThis prospective study evaluated the effect of immediate functional loading (IFL) of a full-coverage prosthesis on the clinical and radiographic outcome of nonsurgical endodontic therapy (NSET) performed on mandibular molar teeth with pulp necrosis and asymptomatic apical periodontitis. MethodsIn 20 subjects, standardized 2-visit NSET was performed in bilateral mandibular first molar teeth (split-mouth model) with a diagnosis of pulp necrosis and asymptomatic apical periodontitis exhibiting a radiographic periapical index (PAI) score ≥3. In each subject, the nonvital bilateral mandibular first molar teeth were randomized to 1 of 2 groups: the IFL group or the functional loading after a time interval of 6 months group. Provisional full-coverage prostheses were provided within 7 days after the completion of endodontic therapy. The cases were followed up clinically and radiographically at 6 and 12 months. Radiographs were assessed for periapical healing based on PAI scores, which were dichotomized as healed (PAI score ≤2) or nonhealed (PAI score ≥3). The data were compared using chi-square and Fisher exact tests. ResultsA recall rate of 100% was achieved at the end of 12 months. All teeth in the IFL group and the functional loading after a time interval of 6 months group were clinically asymptomatic. According to an intergroup comparison between the proportion of teeth healed and nonhealed (radiographic), there was a significant difference (P < .05). ConclusionsIFL of a full-coverage prosthesis in endodontically treated mandibular molar teeth with pulp necrosis and asymptomatic apical periodontitis delayed periapical healing.

Evaluation of the Golden Proportion, Golden Percentage, and Recurring Esthetic Dental Proportion in Kenyans of African Descent.

To evaluate the validity of the Golden Proportion, Golden Percentage, and Recurring Esthetic Dental (RED) Proportion among Kenyans of African descent with naturally well-aligned teeth. Standardized frontal photographic images of the smiles of 175 participants aged 18-35 years were obtained, and Adobe Photoshop was used to analyze and measure the frontal widths of the maxillary central and lateral incisorsand canines in triplicate. The average teeth widths were calculated to determine the existence of the Golden Proportion, Golden Percentage, and RED Proportion, and their validity using independent sample t-tests to compare the differences in the mean teeth widths at α < 0.05. The number of male and female participants was 107 (61.1%) and 68 (38.9%), respectively. The Golden Proportion between the maxillary central and lateral incisors was found in 4.0% on the right and 2.8% on the left of all the participants, but between the maxillary lateral incisors and canines was found in only 0.6% on the right of male participants (p < 0.0001). The RED Proportion between the maxillary lateral and central incisors was in the range of 67%-70%, and between the canines and lateral incisors was 82%-84% (p < 0.0001). The proportion of RED was not constant, and gradually increased distally. The Golden Percentage of 15% was observed in the lateral incisors bilaterally; however, in the central incisors and the canines, the Golden Percentage was 22% and 12%, respectively. The Golden and RED Proportions were invalid determinants of anterior teeth proportions. The Golden Percentage existed only in the lateral incisors. The Golden Proportion, RED Proportion, and Golden Percentage theories may not be applicable to all populations when designing smiles. Racial and ethnic backgrounds are important considerations to establish objective quantifiable values of anterior tooth proportions that are beneficial for esthetic restorations.

SOME INDICATORS OF DENTAL CARE IN PRIVATE INSTITUTIONS OF THE KIROVOHRAD REGION

Relevance. Global upheavals in the country affected the activities of dental institutions, including private ones. Aim of this study. Analysis of the dynamics of dental caries treatment indicators in the adult and children's populations in private institutions of the Kirovohrad region. Materials and methods. According to reference books, an analysis of the indicators of caries treatment and complicated dental caries in private institutions of the Kirovohrad region in 2018, 2020, and 2022 was carried out. Research results. In 2018, 134,408 teeth with caries were treated in the population, 131,669 teeth (98% of all) in adults, and 2,739 teeth (2%) in children. In 2020, 142,589 teeth were treated, which is 5.7% more than in 2018. For adults, 140,094 teeth (90.3%) were treated, 6% more than in 2018, and for children, 2,495 teeth (1.7%) were treated, which is 8.9% less. In 2022, 93,164 teeth were treated in the entire population, which is 34.7% less than in 2020. For adults, 89,771 teeth (96.4%) were treated, 35.9% less than in 2020, and for children, 3,393 teeth (3.6%) were treated, which is 26.5% more than in 2020. In 2018, the proportion of teeth treated for caries to all visits was 90.9%, in 2020 – 92%, and in 2022 – 77.7%. For adults, the proportions were 91%, 92.7%, and 76.9%, and for children, 85.6%, 66.7%, and 109.9%. In 2018, a total of 38,926 teeth were treated for complicated caries, 38,442 (98.8%) in adults, and 484 (1.2%) in children. In 2020, 39,522 teeth were treated (1.5% more than in 2018), 39,067 (1.6% more) in adults, and 455 teeth (6% less) in children, with the proportions remaining the same as in 2018. In 2022, the number of treated teeth in the population decreased by 20.1% to 31,593 teeth, for adults by 21.1% to 30,832 teeth, and for children, it increased by 40.2% to 761 teeth. In 2022, 97.6% of the treated teeth were in adults and 2.4% in children. The specific proportion of complicated caries to teeth treated for caries in the population was 29%, 27.7%, and 33.9% in 2018, 2020, and 2022, respectively. For adults, the proportions were 29.2%, 27.9%, and 34.3%, and for children, the indicator increased from 17.7% in 2018 to 18.2% in 2020 and 22.4% in 2022. Conclusions. Private institutions in the Kirovohrad region were almost unaffected by the quarantine. However, in 2022, there was a decrease in indicators for the entire population and adult patients, but an increase for children.

Interaction between implants and natural teeth in patients with severe periodontitis:a retrospective study

Objective: To evaluate the clinical outcomes after implant restoration in the posterior region of severe periodontitis patients and to investigate the factors of natural tooth affecting the implant from the perspective of improving natural periodontal health, which may provide a reference for clinical practice. Methods: Fifty-three patients with severe periodontitis who visited the Department of Periodontology at the Affiliated Stomatological Hospital of China Medical University from June 2014 to June 2023 and completed posterior implant treatment with single crown were included, among which were 16 males and 37 females, aged (52.2±8.0) years old, with a total of 136 implants, 135 adjacent natural teeth in the edentulous area. We retrospectively compared the changes of probing depth (PD), bleeding on probing (BOP) and tooth mobility (TM) before and after implant placement. Besides, we explored the effects of the natural periodontal status on PD, BOP and marginal bone loss (MBL) of the implant at the last follow-up examination by univariate analysis and multivariate analysis. Results: Fifty-three patients were followed up for (44.5±14.1) months in average, with longest interval of (8.3±2.7) months. The PD of adjacent natural teeth in the edentulous area improved from 4.3 (3.6, 4.6) mm before implantation to 3.6 (3.2, 4.0) mm in the last review (P<0.01), while the proportion of BOP (+) improved from 69.6% (94/135) before implantation to 46.7% (63/135) in the last review (P<0.01). The proportion of teeth with mobility≥Ⅱ decreased from 15.6% (21/135) to 5.9% (8/135) (P<0.01). The percentage of natural teeth with PD≥4 mm in the same segment improved from 21.0% (13.3%, 26.0%) before implantation to 18.0% (12.0%, 25.0%) in the last review (P<0.05). The BOP (+)% improved from 29.0% (24.0%, 35.0%) before implantation to 23.0% (18.0%, 31.0%) in the last review (P<0.05), and the number of teeth with mobility≥Ⅱ decreased from 0.0 (0.0, 1.0) to 0.0 (0.0, 0.8) (P<0.05). The functional tooth unit score of full natural teeth increased from 8.0 (6.0, 10.0) points before implantation to 12.0 (12.0, 12.0) points in the last review (P<0.01). PD≥4 mm % increased from 11.0% (6.0%, 25.0%) before implantation to 13.0% (3.0%, 21.0%) in the last review (P<0.05) and there was no significant differences in BOP (+)% [(17.0±9.7) % vs (14.6±7.2) %, P>0.05]. The number of teeth with mobility≥Ⅱ decreased from 1.0 (0.0, 1.8) to 0.0 (0.0, 0.8) (P<0.05). Conclusions: Under the premise of regular supportive care, implant restorative treatment in the posterior region of severe periodontitis patients is helpful to improve the PD, BOP and TM of remaining natural teeth. Besides, the stages and grades of periodontitis at initial diagnosis can affect the PD and BOP of implants.

Smile aesthetics in Pakistani population: dentist preferences and perceptions of anterior teeth proportion and harmony

BackgroundThis study aimed to evaluate dentist perceptions of attractive smiles in the Pakistani population, considering different dental proportions.MethodsMaxillary casts and digital images were used to create symmetrical representations of anterior teeth. dentists’ preferences for good and bad teeth proportions, width/height ratios, and various dental proportions (golden, recurring esthetic dental (RED), golden percentage, Preston, and local/observed) were assessed using one sample and paired t-test. The Chi-square test was used to determine the gender disparities and factors affecting smile attractiveness. A p-value of ≤ 0.05 was taken as significant.ResultsThe RED proportion emerged as the preferred choice for normal-sized teeth, with specialists and general dentists favoring it over the golden proportion. For tall teeth, the golden proportion was predominantly preferred. The golden percentage received limited preference for aesthetic smile construction.ConclusionsThe smiles created using the principles of RED proportion were opted as the most attractive by local dentists. Factors such as tooth arrangement, color, and midline were highlighted as essential considerations in aesthetic smile construction.

Evaluating the validity of recurring esthetic dental proportion in young adults

Objectives: An important aspect of cosmetic dentistry is developing a geometric or numerical proportion to associate the consecutive width of maxillary anterior teeth. New hypotheses in this area include the Golden proportion, golden percentage, and the recurrent esthetic dental (RED) proportion. This study used digital photos and computer analysis to examine the existing RED proportion associated with the widths of maxillary anterior teeth in people with permanent dentition. Material and Methods: Sixty young adults (28 males and 32 females) were photographed from the front. Digital measurements were taken of all maxillary anterior teeth. Results: To determine whether the RED proportion exists in the permanent dentition, the mean width proportion of the maxillary lateral incisor to central incisor and maxillary canine to lateral incisor was established. The average lateral incisor to central incisor width proportion of the right and left side was determined to be 70% and 71%, respectively. The average canine to lateral incisor width proportion was determined to be 80% and 78%, respectively. Conclusion: The maxillary anterior teeth’s consecutive widths did not exhibit RED proportions in the data that were examined. People’s anterior tooth proportions differ based on their race and ethnicity. Thus, the RED ratio is not the only standard for rebuilding aesthetically acceptable smiles globally.

Elasmobranch assemblages from a bathyal environment spanning the Cretaceous-Paleogene boundary in Austria

Abstract Extensive bulk-sampling of the continuous Cretaceous-Paleogene boundary section at Gams (Styria, Austria) allows for the first time the description of the elasmobranch communities inhabiting the bathyal environment of this well-known section. The sampled succession comprises six horizons from the uppermost Maastrichtian (upper part of Nephrolites frequens Zone CC26) and five horizons from the lowermost Danian (Zone NP1), which yielded a total of 1852 elasmobranch teeth. Although the majority of the teeth are not well preserved, this study enabled the description of at least 16 taxa of the orders Hexanchiformes, Squaliformes, Orectolobiformes, Lamniformes and Carcharhiniformes, providing a rare snapshot of elasmobranch diversity of this specific environmental setting. Beside minor diversity fluctuations between the assemblages, the extensive bulk-sampling of this section did not reveal a marked diversity decline related to the end-Cretaceous mass extinction event. However, a noteworthy correlation between the deepening upward trend of the section with the appearance of frilled and goblin sharks points to changes in palaeobathymetry, which is also reflected in the increase of the total proportion of squaliform teeth in the uppermost sampled horizon. Furthermore, teeth of the extinct triakid Palaeogaleus were recovered exclusively from the Danian deeper deposits, expanding the palaeoecological range of the genus down to fairly deep marine environments. In addition, this study provides the first record of the lamniform Cretolamna ex gr. borealis from the Danian of the Tethyan Realm expanding the palaeogeographic distribution of this group.

Maxillary Anterior Teeth Dimensions and Relative Width Proportions: A Narrative Literature Review.

Predictable results in the aesthetic treatment of anterior teeth can be obtained by resorting to the concept of dental aesthetics and, in particular, defining the ideal tooth dimensions and proportions to obtain a harmonious smile. Considering the great variety of articles dealing with the topic, and the lack of updated reviews, this narrative literature review aims to evaluate current knowledge on anterior teeth dimensions and to verify the existence and the potential applications of the anterior teeth proportioning theories (Golden Proportion, Golden Percentage, RED Proportion, and Golden Rectangle). PubMed, Embase, Cochrane Library, and Google Scholar databases were comprehensively searched using different keywords and term combinations. The research includes articles published up to June 2023, no time limits were set, and only articles in English were included. Inclusion criteria comprehended reviews, clinical studies, and in-vitro studies. A total of 66 articles were selected. Two main topics were identified: "Anterior teeth dimensions", "Golden Proportions, Golden Percentage, RED Proportions, and Golden Rectangle". As far as tooth dimensions are concerned, different width ranges are recognized for men and women and for different ethnic groups. Perfectly symmetric contralateral elements are found in low percentages of subjects. The correlation between dental dimensions and facial parameters is not always present, and it strongly depends on the sample's ethnicity and gender. Ideal tooth proportions were only partially identified.

An Analysis of the Esthetic Proportions of Anterior Maxillary Teeth in a School of Dentistry in Ar Rass.

There are several facets of esthetic dentistry, such as the shade and color of teeth, but the geometric or mathematical proportion aspect is among the most crucial. Theories such as the golden percentage, golden proportion, and recurring esthetic dental are presented in esthetic dentistry. The present prospective observational research was undertaken between January 2022 and January 2023. The volunteers' cohort included individuals aged 18 to 45 years without periodontal disease, free of carious cavities and restorations in the anterior teeth, with a complete set of anterior teeth and at least one quadrant of well-aligned anterior maxillary teeth. We utilized an iPhone mobile lens (Apple Inc., Cupertino, CA) to take photos. The maximum circumference on the mesial and distal contacts of anterior teeth was used as a reference point for measurements. After data collection, a customized Excel spreadsheet (Microsoft Corporation, Redmond, WA) was formulated to facilitate mathematical analysis. This study was conducted on 60 dental students, 43 being male subjects and 17 female subjects. The best results in this study were seen in relation to perceived central incisor width and perceived lateral width as seen from the front. It was found that the unidentified group appears to be the most relevant group with 33 participants (52%), and Preston's proportion was the least frequent with 0 participants (0%). As expected, males appeared to have larger anterior teeth dimensions than females. The actual correlation between maxillary teeth width as perceived from the front view is unidentified. Golden percentage and modified Golden percentage ranked second and third. Preston's proportion did not exist. Based on our study, a new formula for calculating the relation between maxillary anterior teeth width could be raised and should be tested on a wider population.

An Assessment of the Accuracy of Recurring Esthetic Dental Proportion: An In Vivo Comparative Analysis of Maxillary Anterior Teeth Proportion With Chu's Gauge and Custom-Made Calipers.

Smile designing, in harmony with nature, has always been a challenge in dentistry. Several theories have been proposed in the past with a view to replicate an esthetic smile. One such method proposed by Dr. Chu involves using the recurring esthetic dental (RED) proportion. He designed a scale for calculatingthe average values for the height and width of upper anterior teeth for a specified population. However, whether this average is valid for other populations has not been verified. Hence, this study was conducted to evaluate if Chu's gauge value agrees with the dimension of anterior teeth in the South Indian population. The study involved 362 subjects whose anterior teeth dimension was assessed using Chu's gauge and a custom-made caliper. The proportion of the population whose dimension aligns with the average values on Chu's gauge was evaluated. The results showed that in the cohort, 39% had their central incisor dimensioncoinciding with the red band of Chu's esthetic scale, 10% had their lateral incisor coinciding with the blue band of Chu's esthetic scale, and 6.4% of the subjects had their canine dimension coinciding with the yellow band of Chu's esthetic scale.

Root development differences between cleft-adjacent teeth on the cleft side in comparison to their analogs on the noncleft side in patients with nonsyndromic cleft lip and palate who received secondary alveolar bone grafting.

To assess differences in root development between the cleft side (CS) and noncleft side (NCS) for permanent maxillary central incisor and canine longitudinally in patients with nonsyndromic complete unilateral cleft lip and palate (cUCLP) who received secondary alveolar bone grafting (SABG) and to evaluate the effects of SABG on the acceleration of root development of these teeth. Permanent maxillary central incisors and canines of 44 subjects with nonsyndromic cUCLP who had all their cleft-related surgeries performed by the same surgeon were analyzed retrospectively from chart notes and radiographs. Panoramic and periapical radiographs at time point 1 (T1) (age, 7.55 years), at SABG (time point 2 [T2], 10.13 years), and a minimum of 2 years after SABG were studied. Root development rating scores on the NCS and CS were compared using paired t-tests and analyses of proportions. Mean root development score differences (NCS - CS) for canines and central incisors were greatest at T2 but diminished at time point 3 (T3). A larger proportion of teeth on the CS trailed the teeth on the NCS by at least 1 point at T2 than at T1 or T3, with the smallest proportion being observed at T3. The change in root development scores from T1 to T2 and from T2 to T3 showed relative CS acceleration from T2 to T3, indicating a catch-up of root development of cleft-adjacent teeth after SABG. Root development of cleft-adjacent central incisors and canines is slow in comparison with their noncleft analogs. Root development of these teeth accelerates following SABG.

Aging changes in maxillary anterior teeth in untreated individuals: an observational longitudinal study

ObjectiveThe aging of the occlusion and tooth wears influence the smile design This study aimed at evaluating the aging changes of maxillary anterior teeth in nontreated subjects.MethodsThe sample comprised dental models of 23 subjects (13 male, 10 female) with normal occlusions, taken at 13 (T1), 17 (T2) and 61 (T3) years of age. The following variables were measured in the maxillary anterior teeth using digital dental models: crown width/height proportion, anterior view width, crown angulation, gingival and incisal steps between central/lateral incisors and central incisors/canines. Interphase comparisons were evaluated using repeated measures analysis of variance followed by Tukey tests or Friedman tests. Sexual differences were evaluated using t tests (P < 0.05).ResultsFrom 13 to 61 years of age, a decrease of crown width/height proportion (P = 0.008 and P = < 0.001, for the lateral incisor and canines, respectively) and mesiodistal angulation (P = < 0.001, P = 0.001 and P = 0.025 for the central incisor, lateral incisor and canines, respectively) of the maxillary anterior teeth were observed. The steps of the gingival margin and the incisal steps decreased with aging.ConclusionsFrom adolescence to late adulthood, untreated individuals with normal occlusions demonstrated changes in the maxillary anterior teeth that may impair the smile esthetics and attractiveness.

Dental crowding and spacing measurements of the tooth and arch on patients visiting UMDC

A stable and aesthetic set of teeth is ensured by proper alignment. Additionally, a correct tooth position offers excellent conditions for good health and the best possible dental care. However, harmony amongst tooth and arch proportions leads to the continuity and integrity of the dental arch. Any imbalance amongst these components puts a person at risk for dental crowding and spacing, both of which are bad for the function and health of the teeth. Objectives: The goal of the current study was to compare the tooth and arch diameters amongst dental arches that are normal, crowded, and spaced. Methodology: This cross-sectional study was carried out at the UMDC Faisalabad orthodontic department. Patients and/or parents gave their informed consent before the start of therapy so that their records might be utilised for research. 120 dental casts of Pakistani subjects older than 13 years old were gathered as a sample. Dental casts that met the following inclusion criteria were chosen from the files of patients seeking orthodontic treatment: Pretreatment casts of patients with no past orthodontic treatment history, a permanent dentition that has fully emerged and allows accurate measurements of the crown dimensions, and excellent orthodontic casts.

Association between periodontitis and hypertension: cross-sectional survey from the Fourth National Oral Health Survey of China (2015–2016)

ObjectivesTo evaluate the association between periodontitis severity and hypertension based on Chinese epidemiological data.DesignThis cross-sectional survey enrolled adults from the Fourth National Oral Health Survey of China (2015–2016).SettingThe data were...

Clinical Crown Length, Width and the Width/Length Ratio of the Maxillary Central Incisor Among Patients Reporting to a Tertiary Care Center in Nepal

Introduction: The most important aspect of dental and facial esthetics is the display of anterior teeth. It becomes a primary consideration to restore the correct size and proportion of anterior teeth for patients seeking prosthodontic treatment. There is tremendous influence of geographic location, race, ethnic background, gender in determining the size and proportion of anterior teeth. There is paucity of data regarding the width, length and width/length ration of central incisors in Nepalese population. Methods: An Observational, descriptive study was conducted in patients visiting T.U. Dental Teaching Hospital. Maxillary impression was made in alginate impression material and poured in dental stone. A digital caliper was used for the measurements, with a precision of 0.01 mm. The maximum mesiodistal width and the maximum crown length of the maxillary central incisors was recorded for each tooth. These data was tabulated and the width/length ratio was calculated. Data was analyzed using Statistical Package for Social Science Version 17 (SPSS Ver. 17) and descriptive statistics was calculated. Results: A total of 127 participants were included in the study of which 64 (50.39%) were males and 63 (49.61%) were females. The mean width/length ratio for right and left central incisors are 0.89 and 0.86 respectively for males and 0.89 on both the sides for females. In case of right central incisors, males had higher mean crown width and length than female and these differences were found to be statistically significant. In case of left central incisor, there was a statistically significant difference in mean crown length between male and female, males having higher length score than female. Conclusion: Males had higher mean crown width and length than female and these differences were found to be statistically significant. The width/length ration for central incisor ranged from 0.86 to 0.89. Knowledge about the size and proportion of upper anterior teeth allows dental rehabilitation taking into consideration the local parameters of a population.

The clinical efficacy of periodontally accelerated osteogenic orthodontics in patients with bone fenestration and dehiscence: a retrospective study

PurposeThe objective of the study was to explore the effect of periodontally accelerated osteogenic orthodontics (PAOO) in orthodontic patients with bone dehiscence and fenestration in the anterior alveolar region of the mandible.MethodsA retrospective study was performed in 42 patients with bone dehiscence and fenestrations in the anterior alveolar region of the mandible who underwent the PAOO technique. The bleeding index (BI), probing depth (PD), keratinized gingiva width (KGW), gingival recession level (GRL), and gingival phenotype were recorded and assessed at baseline and 6 and 12 months postoperatively. Cone-beam computerized tomography was used to measure bone volume in terms of root length (RL), horizontal bone thickness at different levels, and vertical bone height at baseline and 6 months and 12 months after surgery.ResultsThe sample was composed of 42 patients (22 males and 20 females; mean age, aged 25.6 ± 4.8 years) with 81 teeth showing dehiscence/fenestrations and 36 sites presenting gingival recessions. There was no significant difference in BI, PD, or KGW (between baseline and 6 or 12 months postoperatively) based on the clinical evaluations (P > 0.05). Gingival recession sites demonstrated a significant reduction in the GRL after surgery (P < 0.05). Furthermore, the proportion of teeth with a thick gingival phenotype increased from 33.61% at baseline to 53.13% at the end of the follow-up. In addition, the bone thickness measurements at the mid-root and crestal levels were markedly increased compared with the baseline values (P < 0.05), although the increase in thickness at the apical level was not statistically significant (P > 0.05).ConclusionsWithin the limitations of the study, the results show that the PAOO technique is beneficial to periodontal conditions in terms of soft and hard tissue augmentation. The PAOO procedure may represent a safe and efficient treatment for orthodontic patients with bone dehiscence and fenestration.Trial registrationThis study was approved by the ethics committee of the stomatological hospital affiliated with Xi'an Jiaotong University (xjkqll [2019] No. 016) and registered in the Chinese Clinical Trial Registry (ChiCTR2100053092).

Anterior Upper Teeth Golden Proportion Analysis with Millimetric Templates: An Invention Developed at Londrina State University.

In order to achieve aesthetic and harmonious smile results, the use of anterior upper teeth golden proportion concepts represents reliable and scientific based guidelines. However, measuring, recording and analysing teeth and smiles biometric values proves to be a clinical and laboratory routine chalenge, once it is time consuming and demands additional especific math calculus or formulas. The aim of this paper is present an invention, "anterior upper teeth golden proportion millimetric templates," a set of instruments fabricated in order to achieve precise and fast millimetric measures, once they present predefined geometrical drawings and diagrams. Currently, when planning aesthetic tooth size modifications treatments, tools are used as pachymeters, dry edge compass, or some softwares. Most of times this strategy relies on professional expertise and intuiton, which shows to be limitating factors with the need of trial-and-error training and an accurate critical and artistic sense. Unfortunately, this is not inherent to all professionals, especially undergraduate dental school students. Thus, the templates bring differentials and advantages, being versatile and convenient, allowing countless clinical and laboratory uses, even over a cellphone or a computer screen. An excellent diagnostic aid providing ideal teeth proportions and positioning, increasing the chances of success in dental treatment planning.

A simple method for quick evaluation of the anterior tooth ratio: an observational study

BackgroundAn ideal relationship of anterior teeth is closely related to postoperative function, stability, and aesthetics. Therefore, it is necessary to estimate the proportion of anterior teeth when communicating with patients about possible treatment plans and outcomes. This study aimed to establish a simple method for assessing the proportion of anterior teeth and to identify the standard ratio value to provide references for clinical work.MethodsFive hundred fourteen patients were divided into derivation, standard, and validation datasets. We first deduced our novel simplified anterior tooth ratio (SATR) by finding the key teeth with the derivation datasets, then established standard values by measuring the standard models, and finally validated the diagnostic performance of SATR. Independent sample t-test was used to select key teeth. Pearson’s correlation analysis and linear regression analysis was used to test and verify the correlation between SATR and the anterior Bolton ratio. Chi-square test and diagnostic test were used to verify the diagnostic results using SATR. P values of < 0.05 were considered statistically significant.ResultsPatients with an abnormal anterior Bolton ratio were more likely to have variations in the maxillary and mandibular lateral incisors. Therefore, the ratio of maxillary and mandibular lateral incisors was chosen as a simple way to assess the anterior tooth ratio and was defined as SATR (simplified anterior tooth ratio). A positive correlation was observed between SATR and anterior Bolton ratio (r = 0.702, p < 0.001), with the linear regression equation as follows: y = 0.503 + 0.328x, x = SATR, y = anterior Bolton ratio. The standard value of SATR was established (85.69% ± 3.57%) and proven reliable in clinical practice.ConclusionsThe ratio of maxillary and mandibular lateral incisors can be used to estimate the anterior tooth ratio, which showed high reliability and efficiency.

Characteristics and Dynamics of Smile in Patients With Skeletal Class II Malocclusion Versus Class I Malocclusion Using Still Digital Video Captures: A Three-Group, Cross-Sectional, Comparative Study.

Background Smiling is one of the effective ways for people to express their feelings. It is an integral part of the diagnosis and planning and a key point of the treatment objectivesin orthodontic care. Many factors are associated with a pleasant smile, such as correct anatomy, gingival health, and teeth proportion. Therefore, different malocclusion classes can affect the characteristics of smile esthetics. This study aimed to evaluate the effect of skeletal class II malocclusion on the characteristics and dynamics of the smile in the sagittal and frontal planes. Methodology The study sample included 60patients comprising three groups of malocclusion classes, namely, Class I, Class II division 1, and Class II division 2. A video recording was taken for 5-10 seconds for each patient using a specific camera mounted at a fixed distance from the imaged face. Two facial expressions were captured for each patient, one representing the lips at restand the second representing the unrestricted natural smile. The facial still images were derived from the streaming video recording, and two images were chosen for each plane (the frontal plane and the sagittal plane) for each patient. In total, 12 variables were assessed on these captured images. One-way analysis of variance (ANOVA) was used to detect significant differences between the three groups. Results There were statistically significant differences in some of the measured variables. The mean values of thickness of the upper lip, commissure height, gum width, maxillary incisor display, and interlabial gap were greater in the Class II division 1 group than in the other two groups. The proclined incisors were evident in the Class II division1 group, while the retroclined incisors were evident in the Class II division 2 group. Conclusions The skeletal Class II malocclusion influences the characteristics of the smile, either assessed on the anterior or lateral imaging angles, in addition to its influence on the resting position of the lips. Orthodontists should always analyze patients' facial expressions, including those related to the upper and lower lips at rest and when patients smile naturally. Depending on the results of this analysis, treatment planning could be built to improve the characteristics of the natural smile in patients with Class I and Class II malocclusions.