The Journal of Indian Prosthodontic Society最新文献

{"title":"Correlation between index finger length and occlusal vertical dimension in dentate adults of different facial forms in West Bengal population: A cross-sectional study.","authors":"Priyanjali Paul, Saurav Banerjee, Tridib Nath Banerjee, Anasua Debnath, Debabrata Biswas","doi":"10.4103/jips.jips_18_26","DOIUrl":"10.4103/jips.jips_18_26","url":null,"abstract":"<p><strong>Aim: </strong>The aim of the study was to investigate the correlation between index finger length and occlusal vertical dimension (OVD) across different facial morphological types in dentate adults of West Bengal population.</p><p><strong>Settings and design: </strong>A cross-sectional observational study was conducted among 212 dentate adults (122 males and 90 females) aged 25-55 years attending the outpatient department of Dr R Ahmed Dental College and Hospital, Kolkata, West Bengal, India.</p><p><strong>Materials and methods: </strong>Participants were classified into three facial types based on facial index: euryprosopic ( n = 86), mesoprosopic ( n = 66), and leptoprosopic ( n = 60). Index finger length was measured from the fingertip to the metacarpophalangeal joint using a digital caliper. OVD was measured from subnasale to gnathion using the Willis gauge.</p><p><strong>Statistical analysis used: </strong>Shapiro-Wilk test for normality, Pearson/Spearman correlation coefficients, analysis of variance/Kruskal-Wallis tests for group comparisons, and multiple linear regression modeling were used. Statistical significance was set at P < 0.05.</p><p><strong>Results: </strong>Significant positive correlations were found between index finger length and OVD across all facial types (Mesoprosopic: ρ = 0.555, P < 0.001; Euryprosopic: r = 0.505, P < 0.001; and Leptoprosopic: r = 0.459, P < 0.001). The overall correlation coefficient was 0.503 ( P < 0.001). Multiple regression analysis revealed that index finger length significantly predicted OVD (β = 0.424, P < 0.001), with the model explaining 26.7% of variance ( R² = 0.267, F = 18.90, P < 0.001). The predictive equation was: OVD = 4.03 + 0.41 × finger length.</p><p><strong>Conclusion: </strong>Index finger length demonstrates a moderate positive correlation with OVD across all facial types, suggesting its potential as a supplementary anthropometric guide for OVD estimation in clinical practice.</p>","PeriodicalId":22669,"journal":{"name":"The Journal of Indian Prosthodontic Society","volume":"26 3","pages":"223-230"},"PeriodicalIF":1.3,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13436882/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148370044","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of repeated usage of two different scan bodies on the accuracy of implant position transfer: An in vitro study.","authors":"Koustubh Sharadkumar Shinde, S Raghavendra Prasad, K Chethana","doi":"10.4103/jips.jips_149_26","DOIUrl":"10.4103/jips.jips_149_26","url":null,"abstract":"<p><strong>Aim: </strong>To evaluate and compare the effect of repeated sterilization cycles on linear, angular, and diameter changes, and overall implant position transfer accuracy of titanium and polyetheretherketone (PEEK) scan bodies.</p><p><strong>Settings and design: </strong>An in vitro study.</p><p><strong>Materials and methods: </strong>An in vitro study was conducted using two maxillary acrylic models with implant analogues. Titanium and PEEK scan bodies were scanned using an intraoral scanner, with the initial scan serving as the reference. Each scan body underwent 14 steam autoclave cycles (134°C for 10 min followed by 15 min drying). Scans were exported as STL files and superimposed onto the reference dataset. Linear, angular, diameter, and root mean square (RMS) deviations were measured.</p><p><strong>Statistical analysis used: </strong>Data were analyzed using repeated measures analysis of variance (ANOVA). Mean differences with 95% confidence intervals were calculated, and statistical significance was set at P < 0.05.</p><p><strong>Results: </strong>Both materials showed deviations after repeated sterilization; however, titanium scan bodies exhibited significantly lower linear, angular, and RMS deviations. PEEK demonstrated greater variability and dimensional changes.</p><p><strong>Conclusion: </strong>Repeated sterilization affects scan body accuracy in a material-dependent manner. Titanium scan bodies showed superior dimensional stability and more consistent implant position transfer than PEEK.</p>","PeriodicalId":22669,"journal":{"name":"The Journal of Indian Prosthodontic Society","volume":"26 3","pages":"283-288"},"PeriodicalIF":1.3,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13436867/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148370074","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of chemical surface treatments on the shear bond strength between polyetheretherketone and veneering composite resin: An in vitro study.","authors":"Samir Georges Zogheib, Milton Edson Miranda, Rafael Pino Vitti, Samuel Santana Malheiros, William Cunha Brandt, Raphael Cavalcante Costa","doi":"10.4103/jips.jips_571_25","DOIUrl":"10.4103/jips.jips_571_25","url":null,"abstract":"<p><strong>Aim: </strong>To examine the effects of different chemical surface treatments on the shear bond strength (SBS) between milled PEEK and veneering composite resin.</p><p><strong>Settings and design: </strong>This was an in vitro comparative study.</p><p><strong>Materials and methods: </strong>Sixty PEEK discs were assigned to four groups ( n = 15): no surface treatment (PEEK), bonding using a methyl methacrylate (MMA)-based adhesive (Single Bond Universal) (PEEK + BD), 10% hydrofluoric acid etching followed by bonding (PEEK + HFA + BD), and 98% sulfuric acid etching followed by bonding (PEEK + H 2 SO 4 + BD). The specimens were all bonded by using a MMA-based adhesive (Single Bond Universal). A luting agent (RelyX U200) was used to bond the composite resin (Universal Filtek Z350 X T) to the pretreated PEEK surfaces. An Instron universal machine was used to calculate the SBS between the PEEK and the composite resin following ISO 10477. Failure modes (cohesive, adhesive, and mixed) and interface morphology were analyzed by stereomicroscopy. Data were analyzed using the one-way ANOVA and Tukey's post hoc tests ( a = 0.05).</p><p><strong>Statistical analysis used: </strong>Data were analyzed using the one-way ANOVA and Tukey's post hoc tests ( a = 0.05).</p><p><strong>Results: </strong>The mean SBS values of the PEEK + H 2 SO 4 + BD group (2.09 ± 0.90 MPa) were significantly higher than those of all other groups ( P < 0.05). The 10% HFA etching did not significantly affect the SBS values compared to the control group ( P > 0.05). PEEK + H 2 SO 2 +BD group also had the largest number of cohesive (55%) and mixed (45%) failures.</p><p><strong>Conclusion: </strong>Etching with 98% sulfuric acid followed by a bonding agent significantly improved SBS between milled PEEK and veneer composite, although yet below the minimal threshold values.</p>","PeriodicalId":22669,"journal":{"name":"The Journal of Indian Prosthodontic Society","volume":"26 3","pages":"231-237"},"PeriodicalIF":1.3,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13436857/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148370050","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Two-piece magnet-retained silicone lip prosthesis in a mandibulectomy patient with lower lip defect following oncologic resection: A clinical case report.","authors":"Sandeep Gurav, Madhura Sharma, Kiran Jagtiani, Akanksha Gopal Shetye","doi":"10.4103/jips.jips_454_25","DOIUrl":"10.4103/jips.jips_454_25","url":null,"abstract":"<p><strong>Abstract: </strong>Lower lip defects after oncologic resection can severely affect oral competence, speech, esthetics, and psychosocial well-being. Surgical reconstruction alone may not fully restore dynamic perioral function, requiring adjunctive prosthetic rehabilitation. A 58-year-old male with right lower alveolar squamous cell carcinoma underwent mid-segmental mandibulectomy with immediate free fibula flap reconstruction and primary implant placement, followed by radiotherapy. One year later, he presented with partial lower lip deficiency, drooling of saliva, speech difficulty, and esthetic compromise. A two-piece prosthesis was fabricated, combining an implant-retained overdenture and magnet-retained extraoral silicone lip prosthesis. Cobalt-samarium magnets ensured precise retention, while intrinsic and extrinsic pigmentation improved esthetic integration. At 3 months, the prosthesis showed satisfactory retention, stability, and color durability. Patient-reported outcomes Liverpool Oral Rehabilitation Questionnaire version 3 indicated a 47% improvement in overall score, reflecting gains in function and psychosocial well-being.</p>","PeriodicalId":22669,"journal":{"name":"The Journal of Indian Prosthodontic Society","volume":"26 3","pages":"303-307"},"PeriodicalIF":1.3,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13436860/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148370077","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of patient position on digitally recorded interocclusal distance in prepared teeth: A computer-aided design and manufacturing-based evaluation.","authors":"Vineeta Nikhil, Akash Raj Sharma, Anjali Gupta","doi":"10.4103/jips.jips_94_26","DOIUrl":"10.4103/jips.jips_94_26","url":null,"abstract":"&lt;p&gt;&lt;strong&gt;Aim: &lt;/strong&gt;Accurate recording of interocclusal relationships is critical for the success of prosthodontic restorations fabricated using digital workflows. Although intraoral scanners have improved the precision of occlusal recording, clinical factors such as patient positioning during scanning may influence the digitally recorded interocclusal distance. Limited in-vivo evidence exists regarding the effect of dental chair position on interocclusal gap formation during CAD/CAM-based digital impression procedures. The aim of this study was to evaluate the influence of patient chair position on digitally recorded interocclusal distance during intraoral scanning for single full-coverage crown preparation.&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Settings and design: &lt;/strong&gt;The study design was an in-vivo observational study conducted in the Subharti Dental College and Hospital, Meerut, Uttar Pradesh.&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Materials and methods: &lt;/strong&gt;Thirty adult participants ( n = 30) requiring a single full-coverage crown with intact opposing dentition were enrolled following ethical approval and informed consent. A priori power analysis (α = 0.05, power = 0.80, effect size = 0.5) determined the sample size. Standardized tooth preparation was performed by a single calibrated operator to eliminate inter-operator variability. Each participant underwent intraoral scanning in two standardized dental chair positions: upright and reclined (120° measured between the backrest and seat base). An intraoral scanner (Omniscan; Dentsply Sirona) was used following a standardized scanning protocol. A 10-minute interval was maintained between scans to minimize neuromuscular adaptation. Bite registration scans were exported as STL files and digitally aligned using a best-fit algorithm in three-dimensional analysis software. Interocclusal distance was measured digitally as the relative vertical separation between maxillary and mandibular arches at corresponding occlusal regions. The same examiner performed all measurements to ensure examiner reliability.&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Statistical analysis used: &lt;/strong&gt;Data normality was assessed using the Shapiro-Wilk test. Interocclusal distance values between chair positions were compared using a paired t -test with the level of significance set at P ≤ 0.05.&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Results: &lt;/strong&gt;The interocclusal distance demonstrated a normal distribution for both upright ( P = 0.392) and reclined ( P = 0.760) positions. Mean interocclusal distance in the upright position was 11.76 ± 1.97 mm, whereas the reclined position showed a mean value of 11.08 ± 1.89 mm. The mean difference between the two chair positions was 0.68 mm. The upright position consistently exhibited greater interocclusal distance values across all participants. Statistical analysis revealed a significant difference between the two chair positions ( t = 9.043; P &lt; 0.001).&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Conclusions: &lt;/strong&gt;Patient chair position significantly influences digitally recorded interoccl","PeriodicalId":22669,"journal":{"name":"The Journal of Indian Prosthodontic Society","volume":"26 3","pages":"289-294"},"PeriodicalIF":1.3,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13436887/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148370023","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of glycerol-assisted ultraviolet postcuring duration on residual monomer release from 3D-printed denture base resins.","authors":"Naveen Gopi Chander, Harini Gnana Prakash, Aryan Shivaji Deshmukh, Thummala Venkata Sai Swetha","doi":"10.4103/jips.jips_19_26","DOIUrl":"10.4103/jips.jips_19_26","url":null,"abstract":"<p><strong>Aim: </strong>The widespread use of printable resins contrasts with the limited evaluation of residual monomer release, that remains a significant concern for biocompatibility. Fewer studies estimated the monomer releases in printable denture base resins. The study evaluated the effect of glycerol-assisted UV post-curing at different time intervals on residual monomer release from 3D printed denture base resin.</p><p><strong>Study setting and design: </strong>Invitro experimental study.</p><p><strong>Materials and methodology: </strong>Forty standardized specimens of 50 mm diameter × 3 ± 0.1 mm thickness were made using a DLP 3D printer in accordance with ISO 20795-1:2013 specifications. Following printing and ethanol washing, specimens were immersed in glycerol and subjected to UV post-curing at 0, 10, 20, and 30 minutes. Residual methyl methacrylate (MMA) release was measured by means of high-performance liquid chromatography (HPLC), and values were compared across groups.</p><p><strong>Statistical analysis: </strong>Kruskal-Wallis test and Dunn's post hoc test with Bonferroni corrections.</p><p><strong>Results: </strong>Reduction in MMA release was observed with increasing post-curing duration ( P < 0.001). Mean values decreased progressively from 26.68 ppm (0 min) to 7.78 ppm (30 min), with the 30-minute group demonstrating the lowest monomer elution.</p><p><strong>Conclusion: </strong>Glycerol-assisted UV post-curing significantly reduced residual monomer release. A 30-minute curing duration appears optimal for improving polymerization and enhancing biocompatibility.</p>","PeriodicalId":22669,"journal":{"name":"The Journal of Indian Prosthodontic Society","volume":"26 3","pages":"245-251"},"PeriodicalIF":1.3,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13436895/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148369968","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparative evaluation of effect of rescanning and cut out & stitching with uninterrupted single scan on the accuracy of digital impressions - An in vitro study.","authors":"Alfiya Pathan, Naisargi Shah, Shruti Gill, Rahul Malu, Priya Pungle, Nikhil Bhanushali","doi":"10.4103/jips.jips_440_25","DOIUrl":"10.4103/jips.jips_440_25","url":null,"abstract":"<p><strong>Aim: </strong>The purpose of this study is to evaluate the accuracy of digital impressions (DIs) subjected to rescanning, cutout, and stitching procedures compared to an uninterrupted single scan. Special focus on comparing the effects of these interventions on edentulous regions versus prepared abutment surfaces.</p><p><strong>Settings and design: </strong>This was an in vitro study.</p><p><strong>Materials and methods: </strong>A mandibular typodont with a prepared second molar and an edentulous first molar region was scanned using an intraoral scanner (3 Shape TRIOS 3). Fifty DIs were divided into five groups: uninterrupted single scan, rescanning, cutout and stitching of the concern area, cut-out and stitching of the edentulous area, and cutout and stitching of the prepared abutment. Accuracy was assessed by superimposing STL files of Dis and a reference laboratory scan using three-dimensional metrology software to calculate trueness and precision for local measures and reproducibility, whereas root mean square (RMS) was evaluated for overall geometric deviation.</p><p><strong>Statistical analysis: </strong>Data were analysed using IBM SPSS Statistics v20.0. Normality was assessed using the Shapiro-Wilk test. One-way ANOVA with Tukey post hoc tests was used for trueness and precision, while the Kruskal-Wallis test with Bonferroni correction was used for RMSE. Independent-samples t-tests compared the cutout and stitching techniques between the edentulous and prepared-tooth groups. Statistical significance was set at α = 0.05.</p><p><strong>Results: </strong>The uninterrupted single scans demonstrated significantly higher trueness and precision compared with rescanning and cutout with stitching ( P < .05). No significant differences were observed between rescanning and cutout groups. Within the cutout groups, prepared abutment rescans yielded significantly greater accuracy than edentulous area rescans ( P < .001); whereas RMS error (RMSE) was lowest for rescanning, followed by cutout, whereas uninterrupted scans showing higher variability.</p><p><strong>Conclusion: </strong>Uninterrupted single scans provided the most accurate DIs overall. Rescanning and cutout with stitching procedures reduced trueness and precision but produced clinically acceptable results. Uninterrupted scans having better trueness/precision, but rescanning showing better RMS accuracy was more adversely affected in edentulous regions than in prepared abutments, highlighting the importance of uninterrupted scanning protocols in partially edentulous cases.</p>","PeriodicalId":22669,"journal":{"name":"The Journal of Indian Prosthodontic Society","volume":"26 3","pages":"295-302"},"PeriodicalIF":1.3,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13436875/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148369981","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Encouraging research among undergraduate dental students.","authors":"Manish Katyayan","doi":"10.4103/jips.jips_272_26","DOIUrl":"10.4103/jips.jips_272_26","url":null,"abstract":"","PeriodicalId":22669,"journal":{"name":"The Journal of Indian Prosthodontic Society","volume":"26 3","pages":"213-214"},"PeriodicalIF":1.3,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13436885/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148369974","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A comparative evaluation of the marginal fit of dental copings fabricated by direct metal laser sintering and lost wax technique with two different finish lines - An in vitro study.","authors":"R S Shilpa, P A Shajahan, Rohit Raghavan","doi":"10.4103/jips.jips_616_25","DOIUrl":"10.4103/jips.jips_616_25","url":null,"abstract":"<p><strong>Aim: </strong>The purpose of this in vitro study was to compare the marginal fit of dental copings fabricated by direct metal laser sintering (DMLS) and the lost wax technique with two different finish lines.</p><p><strong>Settings and design: </strong>The study followed an in vitro experimental design.</p><p><strong>Materials and methods: </strong>Two typodont mandibular right first molars were prepared with chamfer and shoulder finish lines. Impressions were made and 28 gypsum replicas for each margin were fabricated. Among the 28 samples with chamfer margins, 14 were prepared with the DMLS technique (Group A) and 14 using the lost wax technique (Group B). Similarly, among the 28 samples with shoulder margins, 14 were prepared with the DMLS technique (Group C) and 14 using the lost wax technique (Group D). Co-Cr copings were evaluated for marginal gaps under a stereomicroscope.</p><p><strong>Statistical analysis used: </strong>SPSS software for Windows (Statistical Presentation System Software, SPSS Inc.) version 17.0 was performed using the statistical analysis. Student's t -test, one-way ANOVA, and Tukey post hoc test were done.</p><p><strong>Results: </strong>All groups demonstrated clinically acceptable marginal fit, but the differences were statistically significant ( P < 0.05). Among the four groups, copings fabricated using the DMLS technique with a shoulder finish line exhibited superior marginal fit.</p><p><strong>Conclusions: </strong>Considering the constraints of the study, superior marginal fit was exhibited by Co-Cr copings prepared with DMLS technique. When the finish line was considered, copings with the shoulder finish line exhibited the least marginal discrepancy.</p>","PeriodicalId":22669,"journal":{"name":"The Journal of Indian Prosthodontic Society","volume":"26 3","pages":"275-282"},"PeriodicalIF":1.3,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13436872/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148369952","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Masticatory functional analysis after replacing multiple missing teeth with implant-supported single crowns - A prospective cohort study.","authors":"Roshan P Thumati, Rakshitha Roshan, Prafulla Thumati, John Radke","doi":"10.4103/jips.jips_397_25","DOIUrl":"10.4103/jips.jips_397_25","url":null,"abstract":"<p><strong>Aims: </strong>To study the outcome of the function after replacing multiple missing teeth with single screw retained crowns.</p><p><strong>Settings and design: </strong>A Prospective cohort study was planned to determine the importance of masticatory functional improvements.</p><p><strong>Objective: </strong>Objective of this study was to evaluate the changes in masticatory timing, movements, and muscle function resulting from replacing multiple missing teeth with implant-supported crowns.</p><p><strong>Materials and methods: </strong>Thirty prospective patients having multiple teeth missing went through Bite force, EMG functional activity, and masticatory incisor-point movements recording during chewing of gum and of hard food before and after replacing the missing teeth with implant-supported crowns. Disclusion Time Reduction (DTR) occlusal therapy was applied to each case after placement. The results obtained were statistically evaluated for significance using Wilcoxon signed-rank test and Student's t-test alpha = 0.05.</p><p><strong>Statistical analysis used: </strong>The Wilcoxon Signed-Rank test was used to analyze the kinematics and Student's t test the muscle activities.</p><p><strong>Results: </strong>For left-sided and right-sided gum-chewing, the group mean values of 4 and 5 quantified parameters calculated from the average chewing pattern were found to have significantly improved toward more normal values (P < 0.05). Same with Hard-bolus chewing group, mean values of 8 and 6 quantified parameters calculated from the Average Chewing Pattern (ACP) were found to have significantly improved towards more normal values (P < 0.05). Same with Hard-bolus chewing group, mean values of 8 and 6 quantified parameters calculated from the Average Chewing Pattern (ACP) were found to have significantly improved towards more normal values (p < 0.05). Multiple EMG average chewing cycle muscle activity patterns also improved significantly (P < 0.05). The mean disclusion time of the group was significantly reduced (P < 0.00000) as was the mean EMG muscle activity during lateral excursions (P < 0.000002).</p><p><strong>Conclusions: </strong>Measurable significant improvements in mean masticatory functional movements and associated muscle activity during gum-chewing were recorded after the placement of the implant-supported crowns followed with DTR therapy to optimize the occlusions. Additional significant changes were seen when the subjects masticated a challenging hard bolus. Mean muscle effort during left and right lateral excursions was also significantly reduced.</p>","PeriodicalId":22669,"journal":{"name":"The Journal of Indian Prosthodontic Society","volume":"26 2","pages":"129-137"},"PeriodicalIF":1.3,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13118152/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147594828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}