Loss Of Posterior Teeth Research Articles

Maxillary Sinus and Surrounding Bone Anatomy With Cone Beam Computed Tomography After Multiple Teeth Loss

The aim of this multicenter study was to examine the residual alveolar bone anatomy and sinus mucosa pattern at maxillary sinus regions in multiple teeth loss. This study was conducted with cone beam computed tomography images of 518 patients (267 females and 251 males) with multiple posterior maxillary teeth loss. Variables associated with sinus membrane (SM), sinus dimensions, ostium, septa, sinus neighborhood, alveolar bone height and ridge width, posterior superior alveolar artery, and adjacent roots were evaluated. No (58.2%) or flat (19.3%) thickening morphology was detected at most of the SMs. Membrane thickening and mucosal-like morphology was more prevalent for male patients (P = 0.005). The mean sinus width was relatively low (3.64 ± 3.33 mm) at the 5-mm level and showed an expected increase toward upper levels. Most of the sinus spaces were dimensionally average (39.5%) or wide (44.7%), and no effect of gender was observed in terms of sinus dimensions (P > 0.05). Multiple teeth loss plays a role in creating an imaginary sinus anatomy constituted of a relatively narrow space compared with single-tooth loss cases, from 3.6-mm mean coronal width to 11.3 mm in the apical portion.

Relationships Between Infant Birth Weight and Maternal Mastication Ability, Caloric Intake and Prepregnancy Body Mass Index of Women with Posterior Tooth Loss

Objective: To analyze the relationships between infant birth weight and maternal mastication ability, caloric intake, and body mass index (BMI) of women with posterior tooth loss. Material and Methods: A cross-sectional study was conducted in 52 females aged 20–35 years who gave birth recently and had one or more unreplaced missing posterior teeth. The number and locations of the missing teeth were grouped on the basis of the Eichner Index. Prepregnancy BMI, caloric intake, and subjective mastication ability were recorded. Results: A significant difference was observed in the mean infant birth weights between the subjects with good and poor mastication in Eichner A2 (p<0.001), B1 (p=0.039), and B2 groups (p=0.039), that mean infant birth weight was lower in the group of women with poor mastication. The Pearson correlation test revealed a significant relationship between maternal caloric intake and infant birth weight (p<0.001). Mean infant birth weights differed between BMI categories, i.e., underweight, normal and overweight women subjects (2.59 ± 0.18 Kg, 2.99 ± 0.15 Kg, 3.58 ± 0.30 Kg) (p<0.001). The Kruskal-Wallis test revealed significant differences between the prepregnancy BMIs of pregnant women with posterior tooth loss and infant birth weights (p<0.001). Conclusion: We found that decreased subjective mastication ability in pregnant women who lost posterior teeth was associated with decreased infant birth weight, whereas higher mean caloric intake and higher prepregnancy BMI in pregnant mothers who lost posterior teeth were associated with increased infant birth weight.

Loss of Posterior Occluding Teeth and Its Association with Protein-Micronutrients Intake and Muscle Mass among Thai Elders: A Pilot Study.

Contact between upper and lower posterior teeth is crucial for chewing. However, the influence of posterior occluding teeth loss on protein intake and muscle mass was unclear. This cross-sectional study compared consumption frequency of protein food, amount of protein and relevant micronutrient intakes and muscle mass indices among older adults with different Eichner indices (EI) of posterior occluding teeth loss. Ninety Thai healthy adults were divided into three groups (N=30 each) according EI with statistically comparable characters. Food frequency questionnaire, 4-days diet record, and bioelectrical impedance analysis were used for outcome measurement. Our findings suggested that loss of posterior occluding teeth on both sides was associated with less frequent consumption of meat, nut, egg, fish and dairy products, inadequate intakes of protein (< 0.8 g/kg body weight), iron and vitamin B12, and reduced muscle mass indices in older adults. Future large-scale cohort studies are warranted to confirm these findings.

Relationships Between Tooth Loss and Masticatory Performance, Nutrition Intake, and Nutritional Status in the Elderly

Objective: To analyze the associations between posterior tooth loss and masticatory performance, nutrition intake, and nutritional status in the elderly. Material and Methods: A total of 158 subjects aged 60 years and older from Depok, West Java, Indonesia were enrolled in this cross-sectional study. Posterior teeth contacts were assessed and the subjects were divided into two groups based on Eichner Index; group A2–B3 and group B4–C3. The masticatory performance test was conducted using color-changeable chewing gum. A semi-quantitative food-frequency questionnaire was used to measure nutritional intake in the form of total calories, and the Mini-Nutritional Assessment-Short Form was used to measure nutritional status. Mann Whitney U test was used to determine differences in masticatory performance, nutrition intake, and nutritional status between the two groups. Results: Seventy-four percent of participants were female, and 26% were male. A significant difference in the mean masticatory performance score (p 0.05). Conclusion: Despite the adequacy of nutrition intake and nutrition status in this population, tooth replacement is necessary to improve masticatory performance in both groups.

ФАКТОРЫ ДЕКОМПЕНСАЦИИ ЗУБОЧЕЛЮСТНОЙ СИСТЕМЫ У ВЗРОСЛЫХ ПАЦИЕНТОВ С ГЛУБОКИМ РЕЗЦОВЫМ ПЕРЕКРЫТИЕМ

Subject. The depth of the overbite increases with age. With the loss of teeth secondary deformations of the dentition, dysfunctions, teeth wearing, periodontal disease and temporomandibular joint (TMJ) dysfunctions occurs, facial aesthetics is affected. The urgency of the topic depends on the high prevalence of anomaly and self-destruction of the orofacial system (OFS) with deep overbite in adults. The aim was to identify the factors of decompensation of the dentition in adults with deep overbite. Methodology. Clinical (questioning, examination, functional tests), anthropometric (photo analysis, casts’ analysis, Shimbachi index) methods and X-ray analysis(cephalometry, analysis of zonograms of TMJ, orthopantomography) were performed for 84 adult patients with deep overbite more than 3 mm (GRP) and Angle Class I or II. All patients were divided into 2 main groups according to the size of overjet: OG-1 ― 42 people with a normal overjet (2 ± 2 mm) between the incisors; OG-2 ― 42 people with an enlarged overjet (more than 4 mm). We used the MSUMD classification of malocclusion (1991). The results of the examination of the patients in 2 main groups were compared with each other and with the average structure of the OFS in patients with physiological occlusion. We have identified specific clinical, anthropometric, and radiological groups of symptoms of decompensation in OFS, which are common for adults with GRP. Conclusions. In adult patients with GRP the main factor of decompensation in OFS is lower jaw displacement. In the development of displacement of the lower jaw a few factors are important: transversal disproportion of the dentition; sagittal jaw disproportion; loss of posterior teeth. The loss of the teeth, the reduction of the interalveolar height and the associated functional and aesthetic problems are adaptive mechanisms for the displacement of the mandible.

HUBUNGAN ANTARA KEHILANGAN GIGI DAN KESEHATAN GIGI DENGAN KUALITAS HIDUP LANSIA DI PUSKESMAS LUBUK BUAYA KECAMATAN KOTO TANGAH

Tooth loss is a problem of dental and oral health that is often found in every individual. The prevalence of tooth loss increases with increasing age in a person, especially in the elderly. Tooth loss causes a decrease in oral function, especially in the function of mastication and physical function in the elderly, which then affects the quality of life. To determine the relationship of tooth loss with quality of life related to oral health in the elderly at Puskesmas Lubuk Buaya Kecamatan Koto Tangah.. The research uses observational analytic with a cross sectional study approach to 105 elderly people (≥ 60 years). Data collection was carried out by means of general interviews with respondents followed by oral examinations and lastly an interview was conducted using the Oral Health Impact Profile-14 questionnaire (OHIP-14). Data analysis used in this study is Chi-square statistical test. The elderly population in Kecamatan Koto Tangah had an average of 5-10 tooth loss with the most distribution were posterior tooth loss. As many as 50.5% of elderly people in Kecamatan Koto Tangah had a good quality of life. The majority of respondents with anterior-posterior tooth loss showed poor quality of life. Chi-square test showed that there was a significant relationship between the number of tooth loss and quality of life related to oral health (p &lt;0.001; OR=16.127) and there was a significant relationship between the location of tooth loss and quality of life related to oral health (p &lt;0.001 ; OR=9,274).

Prevention and Management of Cheek and/or Tongue Biting Related to Posterior Implant‐Supported Fixed Dental Prostheses (ISFDPs)

After the loss of several adjacent posterior teeth, bone resorption occurs that can lead to a marked occlusal discrepancy between arches. This discrepancy may originate from the more pronounced resorption at the facial portion of the alveolar bone crest, often resulting in a more palatal implant position. Therefore, establishing normal overbite and cusp-fossa relation may become difficult, namely causing inappropriate crown contours and emergence profiles. This manuscript describes a technique in which a different occlusal configuration is given to solve some problems that edge-to-edge occlusal configuration produces. For instance, patients may suffer from cheek and/or tongue biting after the delivery of a maxillary posterior implant-supported fixed dental prosthesis resulting in an edge-to-edge occlusal configuration. In instances of severe maxillary resorption in the posterior buccal zone, it is recommended to consider a distinct cross-bite occlusion and by this prevent the well-known discomfort and clinical signs associated with both an edge-to-edge interarch relationship or a so-called "stretched" transversal overbite.

Tooth loss and craniofacial factors associated with changes in mandibular condylar morphology

Objective: To investigate the association between tooth loss and craniofacial factors with changes in mandibular condylar morphology.Methods: A total of 123 patients participated in this cross-sectional study. The mandibular condylar morphology was evaluated using digital panoramic radiography. The exposure variables included gender, age group, molar relationship, facial growth pattern, facial asymmetry, dental midline, posterior crossbite, presence of fixed dental prosthesis, and tooth loss.Results: Unilateral and bilateral mandibular condyle structural alterations were found in 20.3% and 28.5% of the sample, respectively. After the adjustment analysis, posterior crossbite (adjusted OR = 3.34, 95% CI = 1.23–9.06) and tooth loss (adjusted OR = 4.08, 95% CI = 1.72–9.64) were associated with the outcome. The tooth type associated with mandibular condyle structural alterations were premolars and upper molars.Conclusion: The findings suggest that posterior crossbite and tooth loss are associated with mandibular condyle structural alterations.

Utilization of concentrated growth factor as a sole sinus augmentation material

Posterior maxillary tooth loss frequently coincides with loss of available bone volume for implant placement due to both atrophy of the residual crestal bone and enlargement of the maxillary sinus. The longer the teeth have been missing, the greater the loss of osseous structure that may house implants. This necessitates augmentation of the maxillary sinus to provide adequate bone to place implants. Maxillary sinus augmentation with various bone graft material have become routine treatment over the past 38 years. Various materials have been utilized including allografts, xenografts and synthetics with varying levels of success as measured by the amount of graft maturation and its density to support implants following healing. As the use of autogenous blood products has increased in dental surgery for both soft and hard tissue applications, those materials have expanded into use when augmenting the sinus. As blood biology has grown in use with regard to grafting using the patients own blood to supply growth factors and other patient derived products, grafting has improved the clinical results we are able to achieve. These blood derived products have been mixed with packed osseous graft materials to help improve the quality and quantity of the resulting graft following healing. The case presented in this article demonstrates graft maturation as evidenced by density can be achieved using CGF alone with no added osseous graft materials. The benefit of this approach is no issues with the potential of a patient reaction to the packaged osseous graft material that are typically used and cost of treatment is reduced as packaged products are not utilized in the sinus augmentation procedure.

OSC30: The Effect of Temporomandibular Opening Index (TOI) Against Quadrant Numbers and Time Length of Posterior Teeth Loss.

OSC30: The Effect of Temporomandibular Opening Index (TOI) Against Quadrant Numbers and Time Length of Posterior Teeth Loss.

Evaluation of Single Tooth Loss to Maxillary Sinus and Surrounding Bone Anatomy With Cone-Beam Computed Tomography: A Multicenter Study.

Posterior maxillary tooth loss may complicate the implant treatment due to the alterations in alveolar anatomy and maxillary sinus pneumatization. This study aimed to comprehensively examine the anatomical structure of this region from cone-beam computed tomography (CBCT) images. The posterior maxilla regions with single tooth loss were analyzed by dividing the variables into 3 subgroups from images of 597 patients chosen from 1160 CBCTs. Variables associated with sinus membrane (SM), sinus dimensions, ostium, septa, sinus neighborhood, alveolar bone height (ABH) and width (RW), posterior superior alveolar artery (PSAA), and adjacent roots were evaluated. The majority of the patients demonstrated 0 to 5 mm membrane thickness. Irregular SM thickening was lower for female patients. While females showed higher number of narrow sinus, males had higher RW than females. Sinus augmentation classification showed negative correlation with ABH, root-tip sinus floor and edentulous site classification. Posterior septa height was correlated with number of septa and ABH. PSAA diameter and location were also correlated between each other. The present results define formation of a sinus space with 11 mm coronal and 16 mm apical width after single tooth loss. A flat or semispherical thickening around 4 mm is usual in most cases with 51% possibility of anterior septum existence. A ridge anatomy, around 7.5 mm ABH and 7.2 to 9.3 RW from coronal to apical, complements this anatomy. Further studies are needed to clarify the reasons behind the SM and crestal anatomy variations between genders.

Evaluation of fracture resistance of inlay-retained fixed partial dentures fabricated with different monolithic zirconia materials

Statement of problemData are lacking on the fracture resistance of monolithic zirconia inlay-retained fixed partial dentures as a conservative treatment for a single missing tooth. PurposeThe purpose of this in vitro study was to evaluate the fracture resistance of inlay-retained fixed partial dentures produced from 3 different monolithic zirconia materials and based on 2 preparation types and applications with and without thermocycling. Material and methodsA model with missing right and left mandibular first molars was used for different cavity preparations. A tube-shaped cavity and a box-shaped cavity were prepared. Seventy-two epoxy resin casts were prepared from an additional silicone impression. Twenty-four inlay-retained fixed partial dentures from each monolithic zirconia material (Prettau, Zirkonzahn; Katana, Noritake; and Copran, Whitepeaks) were fabricated for each preparation type and cemented to their epoxy model with dual-polymerizing adhesive resin cement; 50% of all specimens were thermocycled for 10000 cycles. The specimens were subjected to a fracture resistance test using a universal testing machine with a crosshead speed of 0.5 mm/min. Fracture surfaces were examined with scanning electron microscopy (SEM), and a specimen from each group was examined for structural changes with differential thermal analysis (DTA). ResultsNo statistically significant differences in terms of fracture resistance were found among brands with both cavity designs and with and without thermal cycles (P>.05). However, SEM and DTA results showed some changes in monolithic zirconia structure after 1 year of aging. ConclusionsThe brands and cavity preparation types for single posterior tooth loss generated similar fracture resistance.

Association between Oral Conditions and Returning Home after Discharge in Elderly Patients.

For elderly inpatients, it may be preferable to return back to their homes after discharge. Therefore, it is important to predict whether elderly patients are able to return home after discharge. Our purpose is to examine the association between geriatric factors including oral conditions and returning home after discharge in elderly patients. A total of 257 elderly patients were enrolled (returned home: N = 116; changed to hospital/nursing home: N = 141). Oral conditions were evaluated by trained dentists. Cognitive impairment was evaluated using the clinical dementia rating scale. Odds ratios (OR) and 95% confidence intervals (CI) to predict the destination after discharge were obtained by unconditional logistic regression analysis. Impaired tongue movement and edentulous were significant oral factors that elderly patients cannot return home (Impaired tongue movement, OR: 2.72; Edentulous, OR, 1.89), whereas presence of loss of posterior occlusion and mobile teeth were not associated statistically. Cognitive impairment, but not aftereffect of cerebrovascular disease, was a significant problem to predict the destination after discharge in elderly patients (Cognitive impairment, OR: 3.58; Cerebrovascular disease, OR: 1.27). Simple, reliable and inexpensive evaluation including oral examination may better predict whether elderly patients can return home after discharge.

Kapanışı olmayan dişlerde uzama, dönme, devrilme sıklığı ve temporomandibular düzensizlikler ile ilgili çalışma

Aim: The purpose of this study was to determine the incidence of overeruption, rotation and tipping in unopposed posterior teeth and study the association among temporomandibular disorders (TMD). Material and Methods: The study group consisted of 191 patients with posterior tooth loss. These teeth (462 molars) overeruption, rotation and tipping records were reviewed. Tooth loss and TMD symptoms were detected. In order to compare the variables Chi-square tests and Fisher’s exact probability test were used. For TMD, Pearson correlation prevalence parameters were used. Results: 291 molars showed no signs of overeruption. 119 molars showed slight, 52 molars had erupted moderate to severe eruption. 184 molars had no signs of rotation, 203 were rotated less than 15°, while 75 molars were rotated more than 15°. 274 molars showed no signs of tipping whereas, 108 had tipping less than 15°, and 80 molars had tipping of greater than 15°. Younger age group and female gender were found to be statistically significant regarding mean scores of TMDs (Age: p<0.05, Gender: p<0.001) Conclusions: Molar rotation was more frequent in the maxilla; whereas overeruption and tipping were more common in the mandible Significant associations between the signs of TMD and tooth loss were found, but the current results does not support the concept that loss of molar support is an etiologic factor in TMDs.

Clinical Considerations while increasing Occlusal Vertical Dimension

ABSTRACTA decrease in occlusal vertical dimension (OVD) may result from tooth structure loss and extraction of posterior teeth, and it affects the esthetics, function, comfort, and lower facial height (LFH). Rehabilitation of patients with worn dentitions may require increase in OVD and interarch distance to create space for restorative materials, improve esthetics, and develop physiologic occlusion. It is usually advisable to assess esthetics, function, LFH, and response of the stomatognathic system to increased OVD by means of removable or fixed provisional appliances before definitive treatment. The following case report presents the multitude of factors considered in planning amount of OVD increase keeping in view its impact on LFH and facial esthetics, during rehabilitation of a patient with severely attrided dentition.How to cite this articlePawar RS, Kulkarni RS, Pimpale SK. Clinical Considerations while increasing Occlusal Vertical Dimension. Int J Prosthodont Restor Dent 2017;7(3):103-107.

Minimally invasive prosthetic restoration of posterior tooth loss with resin-bonded, wing-retained, and inlay-retained fixed dental prostheses fabricated from monolithic zirconia: A clinical report of two patients

The esthetics and biocompatibility of ceramic resin-bonded fixed dental prostheses (RBFDPs) are regarded as better than those of their metal ceramic counterparts. However, a high incidence of complications in the posterior arches of ceramic RBFDPs initiated a process of continuous and evolving design development. This clinical report describes 2 successful restorations of a missing posterior tooth with monolithic zirconia RBFDPs with 2 different retainer designs: retentively prepared adhesive wings and inlays.

Full Mouth Reconstruction of a Patient with Worn Dentition: A Clinical Report

The attrition of anterior teeth leads to the loss of efficient anterior guidance, which protects posterior teeth from wear during lateral excursions. This clinical report describes a 48-year-old man with diagonal tooth wear and posterior mandibular tooth loss. The clinical diagnosis was based on a complete oral examination, photos, functional analysis of lateral excursion movements, general health condition and behavioral aspects such as diet and bruxism. A mandibular partial overlay denture was used to reestablish the occlusal plane after the decision of restoring the vertical dimension of occlusion (OVD) by anatomical landmarks and physiological measurements. Once the compatibility of new OVD was approved and accepted, and followed for six months, fixed implant and tooth supported restorations were fabricated.A satisfactory clinical result was achieved by restoring OVD by 7 mm and avoiding advanced periodontal crown lengthening. Successful full mouth rehabilitation for a severely worn dentition can be achieved through good clinical management with long-term success to improve the quality of life.

Fracture Behavior of Minimally Invasive, Posterior, and Fixed Dental Prostheses Manufactured from Monolithic Zirconia.

To compare ultimate fracture load (Fu ), load at first damage (F1d ), and fracture pattern for posterior fixed dental prostheses (FDPs) manufactured from translucent, yttria-stabilized zirconia polycrystal. Premolar-size FDPs in 4 test groups (n = 16/group) were constructed as veneered complete crown-retained (group 1), monolithic complete crown-retained (group 2), monolithic partial veneer crown-retained (group 3), or monolithic resin-bonded (group 4) prostheses with minimum zirconia wall thickness (0.5 mm). Adhesively cemented to metal abutments, half of the prostheses were artificially aged by use of 10,000 thermocycles (6.5°C/60°C) and 1,200,000 chewing cycles (F = 108 N), before fracture loading. Statistics included two-way non-parametric ANOVA and Dunn-Bonferroni post-hoc tests (α = 0.05). None of the restorations failed during artificial aging. Fu was affected by test group (p < 0.001); F1d was also affected by the factor combination of test group and aging (p = 0.001 for test group; p = 0.049 for test group*aging). Mean Fu for all groups exceeded 1000 N; it was comparable for group 1 and group 2 and statistically significantly higher for group 2 and group 3 than for group 4 (p < 0.01). Fracture usually occurred through the retainer wall. F1d = 200 N was determined for individual samples in group 1 (chipping) and group 3 (local debonding). Fu of all the restorations was adequate for clinical use. Complications might, however, be expected at forces below 500 N for veneered prostheses (chipping) as well as for monolithic partial veneer crown-retained prostheses (local debonding). With regard to fracture behavior, all-ceramic complete crown-retained fixed dental prostheses (FDP) manufactured from monolithic zirconia, with a retainer wall thickness of 0.5 mm, might be suitable for use as a conservative alternative to their veneered counterparts in the rehabilitation of posterior tooth loss. Monolithic zirconia resin-bonded FDP might, moreover, be a viable alternative to resin-bonded FDPs with metal adhesive retainers in posterior arches, with improved esthetics and biocompatibility. The performance of both should, however, be verified in clinical trials. (J Esthet Restor Dent 28:367-381, 2016).

A Study on Relation between Posterior Missing Teeth and Temperomandibular Disorders

AIM: The purpose of this study is to investigate whether the number of missing posterior teeth are associated with TMD. BACKGROUND: Loss of posterior teeth, especially when the number of missing teeth is small, may exert secondary changes, including drifting and tipping of the remaining teeth. The former is the medial or distal movement of a tooth through a stable alveolar ridge, and the latter is the movement from a line perpendicular to the alveolar segment. The result of drifting and tipping is the exhibition of secondary changes in occlusal contact, called ‘tightly locked occlusion’. This could have an effect on TMJ. METHOD AND MATERIAL: This study was conducted at Saveetha Dental College and Hospitals, Chennai. A sample size of 50 partially edentulous patients were included in the study. A questionnaire was provided to the patients to fill in their personnel details like age , gender, while other clinical details corresponding to the patient was recorded and filled by the investigator. RESULT: The result in this study is that, out of 50 individuals women were 23 and men were 27 in numbers respectively. Clicking sound were found in 17.39% and male were 11.1%. Pain was found to be present in 65.2% females and 40.7% males. Unilateral chewing preferences was found to be 73.9% in females and 33.3% in males , while bilateral preference was found in 26.08% females and 66.6% in males. Deviation of mandible was found to be in 47.8% of females and 37.03% of males. CONCLUSION: Symptoms and signs of TMD were associated with loss of posterior teeth among subjects included in the study. The number of subjects who reported TMD symptoms seemed to decrease and those who had TMD signs increased with increasing age. The number of missing posterior teeth increased with age, and was significantly associated with TMD signs and symptoms. Although more women reported symptoms, posterior teeth loss was associated with TMD signs especially among men.

Masticatory efficiency and muscular activity in removable partial dental prostheses with different cusp angles

Statement of problemThe loss of posterior teeth has a negative effect on the masticatory efficiency and activity of mastication muscles. How these muscles are affected by partial removable dental prostheses (PRDPs) with different cusp angles is unknown. PurposeThe purpose of this clinical study was to evaluate the influence of different cusp angles, with anatomic (33 degrees), semianatomic (20 degrees), and nonanatomic teeth (0 degree), on the masticatory efficiency and muscular activity of participants receiving mandibular bilateral distal PRDPs. Material and methodsFifteen participants consented to the evaluation of masticatory efficiency and electromyographic (EMG) activity with a PRDP with a unified bilateral design. The cusp angles of the artificial teeth were randomly changed from anatomic (33 degrees), semianatomic (20 degrees), and nonanatomic teeth (0 degree). Masticatory efficiency was evaluated by recording 5 parameters, including number of strokes, and time of mastication while the EMG activities of the masseter and temporalis muscles, measured using surface electromyography. The data were analyzed with 1-way ANOVA and the Tukey multiple post hoc test with statistical software (α=.05). ResultsWith regard to masticatory efficiency, PRDPs with anatomic and semianatomic teeth exhibited higher masticatory efficiency than those with nonanatomic teeth, whereas no significant differences were found between PRDPs with anatomic and semianatomic teeth. With respect to EMG activity, the least EMG activity was observed in PRDPs with anatomic teeth, whereas the highest activity was observed with nonanatomic teeth. No significant differences were found between the effect of PRDPs with anatomic and semianatomic teeth on masseter activity. ConclusionsChanging the cusp angle from 33 to 20 degrees in PRDPs did not influence the masticatory efficiency or the EMG activity of the masseters. However, it did lead to increased EMG activities of the temporalis muscle. PRDPs with nonanatomic teeth were associated with a significant decrease in masticatory efficiency accompanied by a significant increase in EMG activity.