Oral and Maxillofacial Surgery-Heidelberg最新文献

{"title":"Evaluating smartphone-based 3D imaging techniques for clinical application in oral and maxillofacial surgery: A comparative study with the vectra M5.","authors":"Robin Hartmann, Maximilian Weiherer, Felix Nieberle, Christoph Palm, Vanessa Brébant, Lukas Prantl, Philipp Lamby, Torsten E Reichert, Jürgen Taxis, Tobias Ettl","doi":"10.1007/s10006-024-01322-2","DOIUrl":"10.1007/s10006-024-01322-2","url":null,"abstract":"<p><strong>Purpose: </strong>This study aimed to clarify the applicability of smartphone-based three-dimensional (3D) surface imaging for clinical use in oral and maxillofacial surgery, comparing two smartphone-based approaches to the gold standard.</p><p><strong>Methods: </strong>Facial surface models (SMs) were generated for 30 volunteers (15 men, 15 women) using the Vectra M5 (Canfield Scientific, USA), the TrueDepth camera of the iPhone 14 Pro (Apple Inc., USA), and the iPhone 14 Pro with photogrammetry. Smartphone-based SMs were superimposed onto Vectra-based SMs. Linear measurements and volumetric evaluations were performed to evaluate surface-to-surface deviation. To assess inter-observer reliability, all measurements were performed independently by a second observer. Statistical analyses included Bland-Altman analyses, the Wilcoxon signed-rank test for paired samples, and Intraclass correlation coefficients.</p><p><strong>Results: </strong>Photogrammetry-based SMs exhibited an overall landmark-to-landmark deviation of M = 0.8 mm (SD =  ± 0.58 mm, n = 450), while TrueDepth-based SMs displayed a deviation of M = 1.1 mm (SD =  ± 0.72 mm, n = 450). The mean volumetric difference for photogrammetry-based SMs was M = 1.8 cc (SD =  ± 2.12 cc, n = 90), and M = 3.1 cc (SD =  ± 2.64 cc, n = 90) for TrueDepth-based SMs. When comparing the two approaches, most landmark-to-landmark measurements demonstrated 95% Bland-Altman limits of agreement (LoA) of ≤ 2 mm. Volumetric measurements revealed LoA > 2 cc. Photogrammetry-based measurements demonstrated higher inter-observer reliability for overall landmark-to-landmark deviation.</p><p><strong>Conclusion: </strong>Both approaches for smartphone-based 3D surface imaging exhibit potential in capturing the face. Photogrammetry-based SMs demonstrated superior alignment and volumetric accuracy with Vectra-based SMs than TrueDepth-based SMs.</p>","PeriodicalId":47251,"journal":{"name":"Oral and Maxillofacial Surgery-Heidelberg","volume":"29 1","pages":"29"},"PeriodicalIF":1.7,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11723895/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142956552","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":"Survival benefit of cancer-directed surgery and the role of adjuvant therapy in malignant major salivary gland cancers: a propensity score matched retrospective analysis.","authors":"Ahmed Elkoumi, Omar Elkoumi, Mohamed Hamouda Elkasaby, Huzifa Khitiy, Mariam Khaled Elbairy, Ahmed Tawfik, Omar K Habib, Abeer Shaalan","doi":"10.1007/s10006-024-01316-0","DOIUrl":"https://doi.org/10.1007/s10006-024-01316-0","url":null,"abstract":"<p><strong>Background: </strong>The primary objective of this study was to assess the benefit of cancer-directed surgery (CDS) on both overall survival (OS) and cancer-specific survival (CSS) of patients with malignant major salivary gland cancers (MMSGCs). The secondary objective was to explore the benefits of adjuvant therapy on the survival outcomes of these patients.</p><p><strong>Methods: </strong>Patients diagnosed with MMSGC were extracted from the SEER database and subsequently categorized into two cohorts: CDS and non-CDS. Propensity score matching (PSM) was used to mitigate confounding variables. The survival benefit associated with CDS was evaluated using Kaplan-Meier analysis, log-rank tests, and Cox proportional hazard models. Furthermore, the impact of adjuvant radiotherapy and chemotherapy was explored within the CDS subgroup.</p><p><strong>Results: </strong>A total of 7,029 patients with MMSGC were included. PSM was performed and resulted in a matched cohort between both groups, including 595 patients in each group. Multivariable Cox proportional hazard indicated that patients who received CDS had better OS (HR: 0.45, 95% CI [0.39 to 0.52], P < 0.001) and CSS (HR: 0.46, 95% CI [0.40 to 0.52], P < 0.001). The 5- and 10-year OS for the CDS group was 42% (95% CI, 38 - 46%), and 25% (95% CI, 21 - 29%) consecutively, while the 5- and 10-year OS for the non-CDS group was 20% (95% CI, 17 - 24%), and 12% (95% CI, 9.7 - 16%) consecutively. Moreover, patients with younger age, localized tumors, and lower TNM stage could benefit more from CDS. Radiotherapy as adjuvant therapy was found to be beneficial (HR: 0.69, 95% CI [0.55-0.85], p < 0.001), while chemotherapy could not significantly benefit these patients.</p><p><strong>Conclusion: </strong>CDS improved the OS and CSS survival in MMSGC patients. Specific patient subgroups seemed to have a superior benefit from CDS. Adjuvant radiotherapy could help enhance the survival outcomes of these patients while chemotherapy could not.</p>","PeriodicalId":47251,"journal":{"name":"Oral and Maxillofacial Surgery-Heidelberg","volume":"29 1","pages":"27"},"PeriodicalIF":1.7,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142956545","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reduction of ischemic time using the pull-through technique for scapular free flap.","authors":"Yoshio Ohyama, Kazuki Hasegawa, Narikazu Uzawa, Tomokazu Sawada, Michio Sano, Masashi Yamashiro, Yasuyuki Michi, Yoshinori Inaba, Kunihiro Myo, Takuya Iwasaki, Masahiko Terauchi, Tetsuya Yoda","doi":"10.1007/s10006-024-01323-1","DOIUrl":"https://doi.org/10.1007/s10006-024-01323-1","url":null,"abstract":"<p><strong>Purpose: </strong>Current scapular free flap (SFF) harvest in mandibular reconstruction often requires repositioning, hindering simultaneous harvest and resection and potentially increasing ischemic time. This study evaluated the efficacy of the pull-through technique (PTT) for SFF harvest, aiming to reduce ischemic time during mandibular segmental resection.</p><p><strong>Methods: </strong>A retrospective analysis was conducted on 24 patients who underwent mandibular reconstruction using SFF at two maxillofacial surgery departments between January 2015 and May 2022. In total, 13 patients received PTT, while the remaining 11 underwent non-PTT. Demographic and clinical data were collected, including age, sex, diagnosis, resected mandibular segments, operative time, and ischemic time. Statistical analysis was performed to compare these variables between the PTT and non-PTT groups.</p><p><strong>Results: </strong>The study found no significant differences between the groups in terms of age, sex, diagnosis, number of resected segments, or total operative time. However, ischemic time was significantly shorter in the PTT group than in the non-PTT group. PTT also allowed for minimal position changes during surgery compared with non-PTT.</p><p><strong>Conclusion: </strong>Our study investigated the impact of the PTT on SFF reconstruction during mandibular segmental resection. We found that utilizing PTT-SFF significantly reduced ischemic time compared with the traditional method. This technique offers a potential advantage by facilitating stable blood flow visualization and potentially improving flap viability.</p><p><strong>Clinical trial number: </strong>Not applicable.</p>","PeriodicalId":47251,"journal":{"name":"Oral and Maxillofacial Surgery-Heidelberg","volume":"29 1","pages":"25"},"PeriodicalIF":1.7,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142956506","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Is ADDM graft practical? A comparative study to evaluate ADDM graft in third molar surgery.","authors":"Aashita Jain, D S Gupta, Nandakishore Donepudi, Saubhagya S Agrawal, Deepika Saini, Pooja Bijarniya","doi":"10.1007/s10006-025-01332-8","DOIUrl":"10.1007/s10006-025-01332-8","url":null,"abstract":"<p><strong>Background: </strong>It has been outlined that LTM (Lower third molar) extracted from patients in which grinding, cleaning, sterilization & demineralization prove to be highly effective as graft material for filling the alveolar socket of the very same patient. These investigations aim to assess the efficiency of ADDM (Autogenous Demineralized Dentin Matrix) graft in third molar extraction sockets.</p><p><strong>Purpose: </strong>To check the effectiveness of ADDM as graft material in extraction socket by evaluating pain, swelling, trismus, PD (Probing Depth) and bone density.</p><p><strong>Study design, setting, sample: </strong>A prospective, randomized control trial was conducted at our institute. The patients were haphazardly, non-blindly alienated into two groups. Group A (45 patients) on the test side after LTM impaction surgery will receive ADDM graft material with bio-collagen membrane and Group B (45 patients) on the control side underwent LTM removal, with the alveolus left to heal conventionally by forming a blood clot.</p><p><strong>Results: </strong>Swelling showed significant difference between CG (Control Group) and TG (Test Group), the intergroup comparison of change in the swelling scores at seventh post-operative day (from pre-op level) was significantly higher in the TG (117.35) as compared to the CGs (115.92) (p = 0.001). A statistically significant difference in probing depth was also noted between the two groups, CG 4.46 ± 1.252 & TG 2.52 ± 0.641 in the post-operative examination at three months. In our study radiographical evaluation revealed progressive increase in bone density in TG (135.81 ± 8.73) when compared to CG (121.59 ± 13.83) over a period of three months. Pain and trismus evaluation did not reveal any significant difference between TG & CG.</p><p><strong>Conclusion: </strong>The clinical results of the ADDM graft procedure demonstrate satisfactory outcomes in extraction sockets. The findings of this study highlight the importance of preservation methods in maintaining the periodontal pocket depth distal to the second molar and the remaining alveolar ridge following extraction.</p>","PeriodicalId":47251,"journal":{"name":"Oral and Maxillofacial Surgery-Heidelberg","volume":"29 1","pages":"26"},"PeriodicalIF":1.7,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142956502","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Immunoglobulin G4 related sclerosing disease mimicking a lytic lesion of the mandible: a case report and review of literature.","authors":"Neha Umakant Chodankar, Vikas Dhupar, Anita Dhupar, Francis Akkara","doi":"10.1007/s10006-024-01325-z","DOIUrl":"10.1007/s10006-024-01325-z","url":null,"abstract":"<p><strong>Background: </strong>Immunoglobulin G4 related disease (IgG4-RD) is an immune-mediated, multifocal, fibroinflammatory disease with varied clinical manifestations. The involvement of head and neck region is infrequent. The objective was to report a case of localized IgG4-RD of mandible that clinically mimicked a lytic lesion.</p><p><strong>Case presentation: </strong>A 22 year old female presented with restricted mouth opening and swelling over right ramus and angle region of mandible. Radiographic imaging showed an ill-defined radiolucent lytic lesion infiltrating adjacent muscles. An incisional biopsy was performed and histopathological picture was suggestive of benign spindle cell neoplasm. Immunohistochemistry was suggestive of IgG4-RD involving mandible adjoining soft tissues. Elevated serum IgG4 levels were noted. Oral steroid therapy was initiated and tapered without maintenance dose. The patient progressed without any sequelae. Imaging 2 years after completion of treatment showed complete resolution of the radiolucent lesion.</p><p><strong>Conclusion: </strong>The precise diagnosis of this lesion is challenging and depends on many different factors. A non-specific localized lesion should be investigated as a systemic condition. Early diagnosis and prompt initiation of steroid therapy should be favored. Continued follow up is critical due to the indolent nature of this disease. The future of management of this disease is the development of specific diagnostic criteria and targeted therapy of head & neck lesions.</p>","PeriodicalId":47251,"journal":{"name":"Oral and Maxillofacial Surgery-Heidelberg","volume":"29 1","pages":"24"},"PeriodicalIF":1.7,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142956557","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Stability of expansion effects following Miniscrew-assisted Rapid Palatal expansion: a prospective longitudinal cohort study.","authors":"Hao Chen, Aldin Kapetanović, Zhengguo Piao, Tong Xi, Jan G J H Schols","doi":"10.1007/s10006-024-01319-x","DOIUrl":"10.1007/s10006-024-01319-x","url":null,"abstract":"<p><strong>Purpose: </strong>This study aimed to evaluate the dental and skeletal stability one year after Miniscrew-Assisted Rapid Palatal Expansion (MARPE) by using 3D image data.</p><p><strong>Methods: </strong>Patients with transverse maxillary deficiency from the age of 16 onwards were enrolled consecutively in this prospective longitudinal cohort study. The MARPE appliance was digitally and individually designed and fabricated. Cone-beam computed tomography (CBCT) scans and intra-oral scans (IOS) were acquired before the start of MARPE treatment (T0), immediately after active expansion (T1) and one-year post-expansion (T2). Nasal floor width (NFW), palatal alveolar width at the first molar (M1) and first premolar (P1) (PAW), nasal cavity width (NCW), intermolar width (IMW) and interpremolar width (IPW) were measured to assess the immediate (ΔT0-T1) and net (ΔT0-T2) skeletal and dentoalveolar expansion and relapse (ΔT1-T2). Potential correlations with age, sex and midpalatal suture maturation (MSM) stage were also investigated.</p><p><strong>Results: </strong>Thirty-one patients (6 men, 25 women, mean age: 26.2 years) were included. The mean follow-up time (T0-T2) was 12.2 months. The initial NFW increase demonstrated a relapse of 0.6 ± 1.2 mm, or 11.6% of the initial expansion (p < 0.01). Expansion at the alveolar level remained stable during the follow-up. IPW also remained stable during the follow-up (4.2 ± 1.3 mm at T1; 4.4 ± 2.6 mm at T2). IMW exhibited a relapse of 3.8 ± 2.1 mm, or 60.2% of the initial expansion (p < 0.001) during T1-T2. There was no statistically significant correlation between stability and age, sex and MSM stage.</p><p><strong>Conclusions: </strong>MARPE is an effective therapy for the correction of transverse maxillary discrepancy in late adolescents and adults, achieving a clinically stable skeletal outcome one year after expansion.</p>","PeriodicalId":47251,"journal":{"name":"Oral and Maxillofacial Surgery-Heidelberg","volume":"29 1","pages":"23"},"PeriodicalIF":1.7,"publicationDate":"2025-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142923603","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Factors related to risk of recurrence and recurrence free survival in ameloblastoma of the Jaws: A single centre retrospective analysis.","authors":"Rathindra Nath Bera, Preeti Tiwari","doi":"10.1007/s10006-024-01321-3","DOIUrl":"https://doi.org/10.1007/s10006-024-01321-3","url":null,"abstract":"<p><strong>Purpose: </strong>Ameloblastoma is a benign tumor originating from odontogenic epithelium with a global incidence of about 0.5 cases per million persons per year. The overall recurrence rate of ameloblastomas range from 55% -90%. In this retrospective study we have analyzed the factors associated with recurrence and recurrence free survival in ameloblastoma of the jaws.</p><p><strong>Methods: </strong>Retrospective chart review of 10 years was done from records directory. All demographic data, data on diagnostic modalities, clinical presentations, radiology, management and histology were taken into consideration. Kaplan Meir estimator was used to evaluate recurrence rate and Cox regression analysis (univariate and multivariate) was used to evaluate the odds ratio to find out the possible factors influencing risk of recurrence and influence recurrence free survival. ROC curve (Receiver Operating Characteristic) was used to find out the optimal cut off point for size of the lesion in predicting recurrence. A p value of < 0.05 was considered statistically significant at 95% confidence interval.</p><p><strong>Results: </strong>A total of 75 patients had recurrence with a median follow up of 65 months. The overall 5 year RFS was 19.5%. Conventional ameloblastomas, cortical/ soft tissue invasion, conservative treatment and tumor size ≥ 4 cm were independent predictors of recurrence.</p><p><strong>Conclusion: </strong>Aggressive treatment is preferred for conventional ameloblastomas ≥ 4 cm with cortical/ soft tissue invasion.</p>","PeriodicalId":47251,"journal":{"name":"Oral and Maxillofacial Surgery-Heidelberg","volume":"29 1","pages":"22"},"PeriodicalIF":1.7,"publicationDate":"2024-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142910819","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pre-extraction alveolar buccal bone overbuilding: a preclinical investigation.","authors":"Takahisa Iida, Daniele Botticelli, Michihide Miki, Fernando M Muñoz Guzon, Mauro Ferri, Ermenegildo Federico De Rossi, Shunsuke Baba","doi":"10.1007/s10006-024-01315-1","DOIUrl":"https://doi.org/10.1007/s10006-024-01315-1","url":null,"abstract":"<p><strong>Background: </strong>The pre-extraction overbuilding procedure was designed aiming to mitigate buccal bone resorption following tooth extraction. The objective of this study was to compare the efficacy of pre-extraction and juxta-extraction buccal overbuilding treatments in preserving buccal bone volume following tooth extraction.</p><p><strong>Material and methods: </strong>At the test sites (pre-extraction sites), an alveolar crest overbuilding was performed on the buccal aspect of the distal root of the fourth premolar using a xenograft covered with a collagen membrane. No treatment was applied at the control sites. After 3 months, the distal roots of both fourth premolars were extracted and the alveoli were filled with a collagenated xenograft. An overbuilt procedure was performed also at the control sites (juxta-extraction sites). After 3 months, biopsies were collected.</p><p><strong>Results: </strong>Considering the initial height difference between the lingual and buccal bone plates at the time of extraction, histological evaluation revealed that the resorption of the buccal bone relative to the lingual bone wall was 3.2 mm at the pre-extraction sites and 3.3 mm at the juxta-extraction sites. New bone originated from the residual pre-existing bone crest in an attempt to restore the original dimension.</p><p><strong>Conclusion: </strong>The buccal overbuilding procedures performed three months before tooth extraction did not contribute to preserve the buccal bone crest, despite necessitating an additional surgical procedure. Evidence of ongoing bone regeneration was observed within the augmented space maintained by the biomaterial, suggesting that a prolonged healing period, potentially exceeding six months as indicated by this study, might be required to achieve optimal outcomes.</p>","PeriodicalId":47251,"journal":{"name":"Oral and Maxillofacial Surgery-Heidelberg","volume":"29 1","pages":"21"},"PeriodicalIF":1.7,"publicationDate":"2024-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142899280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Oral surgery complication resulting from undiagnosed common variable immunodeficiency: a case report.","authors":"Eleazar Mezaiko, Lucas Teixeira Brito, Barbara Luiza de Britto Cançado, Weldes Francisco da Silva Junior, Fernanda Paula Yamamoto-Silva, Brunno Santos de Freitas Silva","doi":"10.1007/s10006-024-01310-6","DOIUrl":"https://doi.org/10.1007/s10006-024-01310-6","url":null,"abstract":"<p><strong>Purpose: </strong>This report aims to present an interdisciplinary approach to diagnosing and treating a case of Common Variable Immunodeficiency (CVID), an inborn error of immunity, resulting in successive complications following a third molar extraction procedure.</p><p><strong>Case presentation: </strong>The patient, a 37-year-old Caucasian female, sought a specialist for the extraction of an impacted lower third molar associated with dentigerous cyst. Due to the possibility of mandibular fracture, a bone fixation system was used in the region. However, she experienced recurrent infections following the procedure despite various treatments and hospitalizations, and these infections could not be explained by any factors. The diagnosis of CVID was established through exclusionary factors, low immunoglobulin levels, and comprehensive allergy assessments by an immunologist. Resolution of the patient's condition and discharge were achieved only after removing the fixation system and implementing monthly immunoglobulin infusions.</p><p><strong>Conclusion: </strong>CVID is often diagnosed late, resulting in significant economic, social, and health burdens, including recurrent hospitalizations, allergies, and increased risk of malignancy. This case underscores the importance of considering CVID in patients presenting with unexplained recurrent infections following oral and maxillofacial surgeries. Additionally, it highlights the necessity of a multidisciplinary approach for effectively managing patients with CVID.</p>","PeriodicalId":47251,"journal":{"name":"Oral and Maxillofacial Surgery-Heidelberg","volume":"29 1","pages":"20"},"PeriodicalIF":1.7,"publicationDate":"2024-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142814565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Measurement of bone deformation and insertion torque during dental implant installation.","authors":"Larissa Ramos Xavier Coutinho Nascimento, Guilherme Monteiro Torelly, Carlos Nelson Elias","doi":"10.1007/s10006-024-01294-3","DOIUrl":"https://doi.org/10.1007/s10006-024-01294-3","url":null,"abstract":"<p><strong>Aim: </strong>Insertion of dental implants causes bone deformation and induces residual bone compression stress, which can lead to implant failure if the bone loss threshold is exceeded. The current literature about bone stress is restricted to computer simulations and implant primary stability measurements after installation. This work measures the torque and deformation during implant insertion testing.</p><p><strong>Purpose: </strong>The aim of this work was to analyze the influence surface treatment, thread profile, body shape and the presence of microthreads in the neck on the primary stability, bone deformation and residual stress during dental implants insertion. The insertion torque and resonance frequency analysis (RFA) are the main technique used to measure the primary stability of dental implants.</p><p><strong>Material and methods: </strong>Five models of dental implants with different surface treatments (machined and acid etching), thread profiles (triangular and trapezoidal) and body shapes (cylindrical and conical) were inserted in synthetic bone blocks (polyurethane) with a density of 30 PCF (0.48 g/cm³) compatible with the D2 bone. The insertion torque was quantified by a digital torque driver. Strain gauge extensometry technique was used to measure bone deformation during implant insertion.</p><p><strong>Results: </strong>The bone deformation and torque increase as the number of implants turns insertion increases. Dental implant with trapezoidal thread profile needs higher insertion torque than triangular threads. Implants with a conical shape require higher insertion torque than cylindrical ones. The bone stress induced by machined implant insertion exceeded the bone's mechanical resistance, causing cracks. Conical implants showed better performance than cylindrical ones. The implants with a trapezoidal thread and those with a conical body induce greater insertion torque.</p><p><strong>Conclusion: </strong>Comparing the mechanical behavior, it was found that the machined implants had the worst performance in terms of stress distribution in the synthetic bone, resulting in cracks in the specimen during insertion. Implants with trapezoidal threads and those with a conical body induce insertion torque and bone compression stresses that do not harm osseointegration.</p><p><strong>Clinical relevance: </strong>Excessive deformations in the peri-implant bone led to bone necrosis and implant failure. Thus, the surgeons must analyze the influence of surface treatment, thread profile, and body shape on the osseointegration process.</p>","PeriodicalId":47251,"journal":{"name":"Oral and Maxillofacial Surgery-Heidelberg","volume":"29 1","pages":"19"},"PeriodicalIF":1.7,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142808247","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}