Loss Of Posterior Teeth Research Articles

A novel formula for estimating the vertical dimension of occlusion using panoramic radiography

BackgroundThis study aimed to develop a new formula to easily estimate the vertical dimension of occlusion (VDO) by using the distance between the mental foramen on a panoramic radiograph.Subjects and methodsA total of 508 dentulous subjects were selected from outpatient dental clinics at the College of Dental Medicine, Al-Azhar University. The vertical dimension of the occlusion was measured using a single calibrated calliper. For each subject, a digital panoramic radiograph was taken with fixed exposure parameters. The intermental foramina distance (IMFD) was measured. The data were collected and then analysed using the IBM SPSS version 20.0 software package. (Armonk, NY: IBM Corp.). Linear regression was used to determine the relationship between the intermental foramina distance (IMFD) and the vertical dimension at occlusion (VDO).ResultsPearson’s correlation analysis revealed that there was a strong correlation between the intermental foramina distance (IMFD) and the VDO. Thus, a novel formula was developed for determining the VDO using panoramic radiography.ConclusionThe novel formula developed herein facilitated the determination of the VDO among prosthetic rehabilitation for subjects who lost vertical dimension due to loss of posterior teeth or severe wear of natural posterior teeth. Further studies are needed to determine the clinical applicability of the derived formulae for edentulous subjects.

Association between posterior occlusal support and tooth loss in a population-based cohort: The OHSAKA study

ObjectivesThis study aimed to assess the association between posterior occlusal support (POS) and the risk of tooth loss in older adults aged ≥75 years. MethodsThis longitudinal study analyzed 94,422 participants who participated in multiple dental check-ups provided as part of the public healthcare services in Osaka, Japan, from 2018 to 2022. The participants were categorized into nine groups (A1–3, B1–4, and C1 and C2) according to their POS status using the Eichner index at baseline. The dental charts were compared between the initial and final assessments to assess tooth loss. Logistic regression analysis was used to examine the association between POS status and tooth loss, adjusted for several covariates, including age, sex, body mass index, periodontal status, oral hygiene, history of diabetes, history of hypertension, attendance at the annual dental check-up, and observational period. Furthermore, stratified logistic regression analyses were conducted using anterior or posterior tooth loss. ResultsAfter controlling for confounders, POS status was associated with tooth loss. The odds ratios (ORs) with A1 as the reference were 1.74 in A2, 2.55 in A3, 3.40 in B1, 4.74 in B2, 5.79 in B3, 6.00 in B4, 4.44 in C1, and 3.00 in C2, respectively. The ORs for anterior tooth loss were higher than those for posterior tooth loss, with the highest OR observed in B4 (21.4). ConclusionsThis large population-based cohort study showed that a decreased POS was a risk indicator for tooth loss; furthermore, the risk increased even further in the anterior teeth region.

Association of tooth location, occlusal support and chewing ability with cognitive decline and incident dementia.

Emerging evidence suggests association of tooth loss with impaired cognition. However, the differential effects of anterior versus posterior tooth loss, occlusal support loss and chewing ability are not considered comprehensively. We conducted cross-sectional (N = 4036) and longitudinal analyses (N = 2787) on data from Health 2000 and 2011 Surveys for associations of posterior occlusal support loss, anterior versus posterior tooth loss, and chewing ability with baseline cognition and 11-year cognitive decline. Additionally, 15-year incident dementia risk was investigated (N = 4073). After considering relevant confounders and potential reverse causality bias, posterior occlusal support loss significantly increased dementia risk across all categories indicative of posterior occlusal support loss (hazard ratios [HRs] between 1.99 and 2.89). Bilateral inadequate posterior occlusal support was associated with 11-year decline in overall cognition (odds ratio [OR] = 1.48:1.00-2.19), and unilateral inadequate posterior occlusal support with total immediate (OR = 1.62:1.14-2.30) and delayed recall decline (OR = 1.45:1.03-2.05). Moreover, posterior tooth loss was associated with dementia (HR = 2.23:1.27-3.91) and chewing ability with total immediate decline (OR = 1.80:1.04-3.13). Posterior tooth and occlusal support loss significantly increases dementia risk. The impact of posterior occlusal support loss appears to be dose-dependent, and this effect is distinct from that of dentures. Dental healthcare services should be particularly attentive to the state of posterior dentition. Further studies exploring possible mechanisms are warranted.

The effect of enhanced structure in the posterior segment of clear aligners during anterior retraction: a three-dimensional finite element and experimental model analysis

BackgroundMesial tipping of posterior teeth occurs frequently during space closure with clear aligners (CAs). In this study, we proposed a new modification of CA by localized thickening of the aligner to form the enhanced structure and investigate its biomechanical effect during anterior retraction.MethodsTwo methods were employed in this study. First, a finite element (FE) model was constructed, which included alveolar bone, the first premolars extracted maxillary dentition, periodontal ligaments (PDL), attachments and aligners. The second method involved an experimental model—a measuring device using multi-axis transducers and vacuum thermoforming aligners. Two groups were formed: (1) The control group used common CAs and (2) the enhanced structure group used partially thickened CAs.ResultsFE model revealed that the enhanced structure improved the biomechanics during anterior retraction. Specifically, the second premolar, which had a smaller PDL area, experienced a smaller protraction force and moment, making it less likely to tip mesially. In the same vein, the molars could resist movement due to their larger PDL area even though they were applied larger forces. The resultant force of the posterior tooth was closer to the center of resistance, reducing the tipping moment. The canine was applied a larger retraction force and moment, resulting in sufficient retraction of anterior teeth. The experimental model demonstrated a similar trend in force variation as the FE model.ConclusionsEnhanced structure allowed force distribution more in accordance with optimal principles of biomechanics during the extraction space closure while permitting less mesial tipping and anchorage loss of posterior teeth and better retraction of anterior teeth. Thus, enhanced structure alleviated the roller coaster effect associated with extraction cases and offered a new possibility for anchorage reinforcement in clear aligner therapy.

Oral rehabilitation of a patient with collapsed occlusal plane resulting from loss of posterior teeth

Oral rehabilitation of a patient with collapsed occlusal plane resulting from loss of posterior teeth

Full mouth rehabilitation of a patient with tooth wear and insufficient restorative space due to loss of posterior teeth support: a case report

Full mouth rehabilitation of a patient with tooth wear and insufficient restorative space due to loss of posterior teeth support: a case report

Evaluation of different designs for posterior cantilever zirconia inlay-retained fixed dental prostheses in missing tooth replacement: Stage one results with 18-month follow-up assessment

ObjectivesThis clinical study aimed to investigate the outcomes and survival rates of different variations of inlay-retained fixed dental prostheses (IR-FDPs) composed of monolithic zirconia ceramic. The IR-FDPs with a single-retainer design were used for replacing missing mandibular second premolars. The research evaluated the effectiveness and longevity of these prostheses in clinical settings. MethodsA total of 30 IR-FDPs (n = 30) were placed for 27 female patients who presented with missing mandibular second premolar teeth. For this study, the mandibular first molar was chosen as a retainer for the cantilever IR-FDPs and the study involved a random assignment of participants into three distinct groups, each comprising 10 individuals (n = 10). The criterion for the grouping was the retainer design: inlay ring (IR), lingual coverage (LC), and occlusal coverage (OC). The three groups included mesial inlay box with the same dimensions (3 mm height, 3 mm width and 2 mm depth). All IR-FDPs were manufactured using monolithic high translucent 3Y zirconia and the connector area to the cantilever pontic was adjusted to dimensions of 3 × 3 mm for all designs. The restorations were bonded using adhesive resin cement. The clinical and radiographic evaluations of the restorations were conducted for a duration of 18 months, following the modified FDI (World Dental Federation) criteria. ResultsThe restorations were observed in stage one for a period of 18 months. Only one restoration in group LC was debonded after 10 months and re-bonded. The clinical quality of all crowns and the patient's satisfaction were high. No adverse soft tissue reactions around the crowns were observed and only one abutment in group IR was endodontically treated after 12 months. ConclusionsZirconia cantilever IR-FDPs offer a viable short-term treatment option for replacing missing posterior teeth, providing esthetic and functional benefits while minimizing invasiveness. Over an 18-month observation period, these prostheses have demonstrated a remarkable survival rate of 100% and a success rate of 96.6%. These findings suggest the effectiveness and reliability of zirconia cantilever IR-FDPs as a short-term solution for replacing missing posterior teeth. Clinical significanceZirconia cantilever IR-FDPs could present a practical solution for addressing posterior tooth loss, especially in cases where implant placement is not recommended and conventional fixed dental prostheses entail excessive invasiveness.

Efek jumlah kehilangan gigi posterior terhadap bentuk kondilus di rsgm-p fkg usakti melalui radiografi panoramik (Laporan Penelitian)

Background: Effects of tooth loss is the cause of occlusal imbalance that can cause changes in the shape of the condyle, which usually occurs after the age of 30 years. The condyle shapes were classified into 6 types; normal, osteophyte, flattening, erosion, subcortical cyst, and sclerosis. Objective: Determine whether there is an effect of the number of posterior tooth loss on the condyle shape in adult aged 30-45 years using panoramic radiography at Radiology Installation of the RSGM-P FoD, Trisakti University. Research method: Cross-sectional approach to the condyle shape from 80 panoramic radiograph samples with the number of tooth loss <3 and ≥3 posterior teeth at Radiology Installation of the RSGM-P FoD, Trisakti University with subjects aged 30-45 years. Result: In the number of posterior tooth loss <3 teeth and ≥ 3 teeth on the right and left sides, the condyle shapes are generally normal. There are pathological shapes that is most found is flattening and the least found is osteophyte. No subcortical cyst was found. Condylar process which undergoes more changes is on the left side and the prevalence in women is higher. The research data was analysed using Chi-square test with the result p > 0.05. Conclusion: There is no significant effect between the number of posterior tooth loss on the condyle shape in adult subject aged 30-45 years using panoramic radiography at the Radiology Installation of the RSGM-P FoD, Trisakti University.

Association between the number of bilateral free-end posterior tooth loss and mastication performance in RSGM USU patients

Mastication is the process of mechanically crushing food to form soft particles, facilitating theingestion process in providing nutrients to the body. One of the objectively assessed mastication functions is mastication performance. The number of tooth losses is one factor that affects mastication performance; the more tooth loss, the lower the mastication performance. Posterior teeth play an important role in mastication function, and loss of posterior teeth decreases mastication performance. The research aims to determine the association between the number of bilateral free-end posterior tooth loss and mastication performance. This type of research is descriptive-analytic with a cross-sectional design. The subjects in this research were 17 people. Data were collected by examining the oral cavity and color-changeable chewing gum to assess mastication performance using a colorimeter. Data were analyzed using the Mann-Whitney test. The results showed that all subjects with bilateral free-end posterior teeth loss in one and both arches had poor mastication performance. The statistical test results showed no association between the number of bilateral free-end posterior teeth loss and mastication performance in one and both arches with p = 1,000 (p 0.05). It can occur because this research does not pay attention to the number of occlusion pairs of posterior teeth and the results of the assessment of mastication performance are not quantitative. The number of bilateral free-end posterior tooth loss can be considered in assessing mastication performance as an educational basis for denture care. KEYWORDS: Posterior Bilateral Free End, Mastication Performance

Updating The General Practitioner on The Association Between Teeth Loss and Temporomandibular Disorders: A Systematic Review.

The belief about a possible association between the absence of one or more teeth and the presence of temporomandibular disorders (TMD), although old, is still present among the dental class. Although evidence points to a lack of association between loss of posterior support and the presence of TMD, we do not have critical studies on the extent, quantity, or location of these losses. In this sense, this systematic review aims to investigate the association between tooth loss and the presence of TMD signs or diagnostic subgroups. Search strategies using a combination of keywords tooth loss and TMDs were performed in six databases (PubMed, Embase, Web of Science, Livivo, Lilacs, and Scopus) and gray literature from August to September 2020. Observational studies that investigated the association between tooth loss in TMD were considered. The risk of bias was assessed using the Joanna Briggs Institute (JBI) Critical Assessment Checklist for cross-sectional analytical studies, case-control, and cohort studies. Finally, the level of certainty measured by the Grading of Recommendations Assessment, Development, and Evaluation (GRADE) was assessed. Six articles were included in the review according to the eligibility criteria. Of these, five had a high risk of bias and one had a moderate risk. Only one study showed an association between the loss of posterior teeth and the presence of joint sounds and joint pain, the others found no significant association with sign or TMD subgroups diagnostic.There is no scientific evidence to support the association between one or more tooth loss and the presence of TMD signs and symptoms or diagnostic subgroups.

Periodontal risk score: Initiation and model validation for 6,762 teeth.

Tooth-level prognostic systems are valuable tools for treatment planning and risk assessment of periodontally involved teeth. Recently the Miller-McEntire prognosis index was found to outperform comparable systems. However, it had some limitations. The present study aimed todevelop and evaluate the prognostic performance of a modified version that addresses most limitations of the previous model called the periodontal risk score (PRS). Data were retrieved retrospectively frompatients who received surgical and non-surgical periodontal treatment at a university setting.Data on medical history and smoking status at baseline and the last maintenance visitwere collected. Both univariate and multivariate Cox proportional hazard regression models were used to analyze the prognostic capability for predicting tooth loss due to periodontitis (TLP) risk. A total of 6762 teeth (281 patients) werefollowed up for a mean period of 22.6±6.34 (10-47.6y) years. The PRS was successfully able to stratify the risk of TLP at baseline when the three different classes of association were compared for anterior and/or posterior tooth loss. After controlling for maintenance, age, and sex, the index showed an excellent predictive capacity for TLP with a Harrell C-index of 0.947. The periodontal risk score (PRS) displayed excellent predictive capability for anterior as well as posterior tooth loss due to periodontitis. This system was able to predict long-term tooth loss with a very high accuracy in a population treated mainly by dental students and periodontics residents. The use of this/similar prognosis system is advisable as a means to establish tooth prognosis.

Digital versus radiographic accuracy evaluation of guided implant surgery: an in vitro study

BackgroundCone-beam computed tomography (CBCT) is the most widely used method for postsurgical evaluation of the accuracy of guided implant surgery. However, the disadvantages of CBCT include radiation exposure, artifacts caused by metal implants, and high cost. Few studies have introduced a digital registration method to replace CBCT for evaluating the accuracy of guided surgery. The purpose of this study was to compare digital registration to conventional CBCT in terms of the capacity to evaluate the implant positioning accuracy of guided surgery.Materials and methodsThis in vitro study included 40 acrylic resin models with posterior single mandibular tooth loss. Guided surgery software was used to determine the optimal implant position; 40 tooth-supported fully guided drilling templates were designed and milled accordingly. After the guided surgery, the accuracies of the surgical templates were evaluated by conventional CBCT and digital registration. For evaluation by conventional CBCT, postsurgical CBCT scans of the resin models were performed. The CBCT data were reconstructed and superimposed on the implant planning data. For digital registration, we constructed a virtual registration unit that consisted of an implant replica and a scan body. Next, we obtained postsurgical optical scans of resin models with the scan body. The postsurgical implant position was identified by superimposition of the registration unit and optical scan data. The implant planning data and postsurgical implant position data were superimposed; deviations were reported in terms of distance for implant entry/apex point and in terms of angle for the implant axis. Interclass correlation coefficients (ICCs) and Bland–Altman plots were used to analyze the agreement between the two evaluation methods.ResultsThe ICCs between the two methods were 0.986, 0.993, and 0.968 for the entry point, apex point, and angle, respectively; all were significantly greater than 0.75 (p < 0.001). Bland–Altman plots showed that the 95% limits of agreement of the differences were − 0.144 to + 0.081 mm, − 0.135 to + 0.147 mm, and − 0.451° to + 0.729° for the entry point, apex point, and angle, respectively; all values were within the maximum tolerated difference.ConclusionConventional CBCT and digital registration showed good agreement in terms of evaluating the accuracy of implant positioning using tooth-supported surgical templates.

Premature Primary Tooth Loss and Oral Health-Related Quality of Life in Preschool Children.

The present study aimed to evaluate the association between premature primary tooth loss and oral health-related quality of life (OHRQoL) in preschool children. A cross-sectional study was conducted in 769 5-year-old preschool children. The children and their parents or guardians answered the Brazilian version of the Scale of Oral Health Outcomes for 5-Year-Old Children for the assessment of OHRQoL. Meanwhile, clinical examinations were performed for the assessment of premature primary tooth loss. Unadjusted and adjusted multilevel Poisson regression models were utilized to investigate the associations between the variables. In the parental version of the scale, premature posterior primary tooth loss (rate ratio [RR] = 2.65; 95% confidence interval [CI] = 1.51–4.68), weak sense of coherence (RR = 2.25; 95% CI = 1.62–3.11), and visit to a dentist (RR = 1.61; 95% CI = 1.04–2.52) were associated with OHRQoL. Based on the children’s perceptions, only the preschool type was associated with OHRQoL (RR = 1.92; 95% CI = 1.21–3.05). Premature posterior primary tooth loss had a greater impact on OHRQoL based on the parents’ perception, whereas only the preschool type was associated with OHRQoL based on the children’s perception.

What factors predict craniomandibular disorders in severe COVID-19 survivors after prolonged intubation?

PurposesTo estimate and identify predictors of craniomandibular disorders (CMDs) in severe COVID-19 survivors after prolonged intubation ≥ 1 week (SCOVIDS-PI). MethodsThis retrospective study enrolled two cohorts of SCOVIDS-PIs with vs. without CMD during a one-year period. The predictor variables were demographic, dental, anesthetic, and laboratory parameters. The main outcome was presence of CMD until six post-PI months (yes/no). Appropriate statistics were computed with α = 95%. ResultsThe sample comprised 176 subjects aged 59.2 ± 17.2 years (range, 27–89; 11.9% with CMDs; 30.1% females). CMDs were significantly associated with (1) bilateral posterior tooth loss (P = 0; number needed to screen [NNS] = 1.6), (2) dentofacial skeletal class II/convex face (P = .01; NNS = 2.2), and (3) peak CRP during intensive care ≥ 40 mg/l (P = .01; NNS = 3.5). With combined predictors, NNS became 2 to 4.3. ConclusionsThree predictors of CMDs in SCOVIDS-PIs: bilateral molar loss, convex face, and CRP ≥ 40 mg/l, indicate CMD screening and/or referral to a CMD specialist, regardless of patients’ age, gender, underlying CMDs, or previous dental checkups. Screening ∼2 to 4 “SCOVIDS-PIs with ≥ one predictor” will identify one CMD events/patients during the first six post-PI months.

Multi-modality treatment approach with precision attachment and implant overdenture for geriatric patient

Partial and complete edentulous conditions are a common occurrence in the field of dentistry. Many patients report to the dentist with the loss of posterior teeth or complete loss of teeth with compromised bone conditions. Often, these scenarios are difficult to treat with a one-way approach and may require a multidisciplinary approach. Complete loss of bone or compromised bone conditions may delimit the fixed options. Hence, a treatment option that can bridge the pathway between fixed and removable options can be elected, to give patients a satisfactory restorative treatment which will fulfill both functional and esthetical demands. This clinical report describes the complete rehabilitation of partial and complete edentulism by combining the principles of fixed and removable prosthodontics to obtain the benefits of both the treatments.

PROSTHETIC REHABILITATION OF THE CLASS 3 MALOCCLUSION: A CASE REPORT

Loss of posterior teeth impacts a patient’s function as well as their facial esthetics. Changes in the Occlusal Vertical Dimension (OVD) may result in anterior crossbite or Class III malocclusion. This clinical report describes the prosthodontic management and stabilization of a patient with reverse anterior articulation due to loss of posterior occlusal support.The comprehensive diagnostic approach,the information gathered from the provisional phase and the consistent sequence of clinical and laboratory stages led to a definitive treatment outcome that guaranteed the success of the prostheses and the patient’s comfort and satisfaction.The clinical case described indicates that the prosthodontic management of Class III malocclusion, when carefully planned, can be a safe procedure that aims to ensure the immediate and longitudinal improvement of a patient’s function and esthetics.The treatment was based on the class III diagnosis. Therefore, the patient was rehabilitated by occlusal adjustments and conventional teeth and tissue - supported prostheses and without the need for invasive orthognathic surgery.

A case of treatment denture and implant-assisted removable partial denture in a patient with collapsed occlusion caused by partial loss of posterior and anterior teeth

A case of treatment denture and implant-assisted removable partial denture in a patient with collapsed occlusion caused by partial loss of posterior and anterior teeth

Tooth Loss Patterns in Hypertensive Patients with Chronic Periodontitis

Aim: The aim of the study is to study the tooth loss pattern in patients with chronic periodontitis and hypertension.&#x0D; Study Design: Retrospective cohort study.&#x0D; Materials and Methods: The case sheet records (DIAS data) of tooth loss pattern in hypertensive patients with chronic periodontitis were extracted. A total of 1318 case sheets were analysed for the study. Age, gender and tooth loss pattern with respect to the region were collected and statistically analysed. Descriptive statistics (Percentage, Mean, Standard deviation) and Inferential test (Chi- square test) were performed to determine the association between age, gender and tooth loss pattern in patients with chronic periodontitis and hypertension.&#x0D; Results: The results showed that that females were affected more with tooth loss with hypertension with chronic periodontitis when compared to males. According to age, patients between 50 to 70 years with chronic periodontitis and hypertension were more affected by tooth loss (p value = 0.001 (p&lt;0.05; Statistically significant)).&#x0D; Conclusion: The present study highlighted a possible relationship between hypertension and tooth loss due to chronic periodontitis. Loss of mandibular posterior teeth were more common and females were more prone to tooth loss than males with hypertension due to chronic periodontitis. However, the underlying mechanism has to be further investigated in a different study design, thus more conclusive findings would be elucidated.

Tooth Loss Patterns in Patients with Periodontitis and Diabetes Mellitus

Aim: Periodontitis is an inflammatory, multifactorial disease which results in destruction of supporting tissue and bone thereby resulting in loosening of the tooth. Tooth loss is one of the major oral issues faced by elderly patients. Thus the present study aimed to investigate the prevalence of tooth loss among periodontitis patients.&#x0D; Methodology: Data collection was conducted from June 2020 to March 2021 among 200 periodontitis patients with diabetes mellitus based on the record management system software to analyse the most frequent missing tooth at the time of first visit. Frequency of maxillary anterior, maxillary posterior, mandibular anterior and mandibular posterior tooth loss was assessed in the study.&#x0D; Results: Among the frequency distribution the mandibular posterior tooth loss was the most common among periodontitis with diabetes patients. In case of anterior tooth loss the results were almost similar with 16% of maxillary anterior tooth loss and 17% in case of mandibular anterior tooth loss. Male subjects presented with more missing teeth in mandibular posterior tooth region when compared to females but not statistically significant (p&gt;0.05).&#x0D; Conclusion: The present study results showed that there is no significant association between sex and maxillary anterior, mandibular anterior, maxillary posterior and mandibular posterior tooth loss (p&gt;0.05). The present study showed that mandibular posterior tooth loss was most frequent among periodontitis with diabetes mellitus patients.

Anterior occlusion in shortened dental arches

ObjectivesThe aim of this study was to examine the occlusion of anterior teeth in individuals with shortened dental arch (SDA).Material and methodsIn a case–control clinical study, 41 individuals with SDA and 41 individuals with complete dental arch (CDA) participated. The CDA control group was matched for age and gender. Testing for occlusal contacts of anterior maxillary teeth was conducted by biting on foil strips (8 µm) with subjectively normal bite force (NBF) and maximal bite force (MBF). The data was analyzed on individual and tooth levels.ResultsThe median rates of anterior maxillary teeth with occlusal contacts were 0.67 (NBF) and 0.83 (MBF) in the SDA group and 0.50 (NBF) and 0.83 (MBF) in the CDA group. Within both groups, the contact rates were significantly higher in MBF. The group difference with NBF was significant. A generalized linear model showed that the odds of an anterior maxillary tooth to have an occlusal contact were greater in the SDA both for NBF with an odds ratio (OR) 2.277 and MBF with an OR 1.691.ConclusionsThe findings suggest effective compensatory mechanisms relative to the occlusal function in individuals with SDA.Clinical relevanceThe study delivers further evidence regarding the SDA concept as a viable option in the management of posterior tooth loss.