Paradigm Change for Intraoperative Surgical Margin Assessment for Oral Squamous Cell Carcinoma.

OBJECTIVE: Achieving clear surgical margins is one of the primary surgical goals in treating oral squamous cell carcinoma (OSCC) and thus aiming to improve overall and disease-specific survival. Therefore, we developed the Goal-Oriented Assessment for Intraoperative Margin ('GAIM') protocol, a novel intraoperative approach for margin assessment, and present here our 5-year experience and outcomes. METHODS: 'GAIM' is a 7-step procedure comprising systematic ruler-aided resection of labeled tumor-bed margins, frozen section (FS) co-produced by both pathologists and operating surgeons, and immediate extension of resection according to FS findings. Data from all patients operated using the 'GAIM' protocol at a single tertiary center between 2018 to 2022 were analyzed, including margin status on FS and final pathology (FP) records, recurrence, and mortality. RESULTS: A total of 196 patients were included, 56.6% (n = 111) stages I-II, and 43.4% (n = 85) stages III-IV. Using the 'GAIM' protocol, we achieved an overall 94.4% of clean and revised clean surgical margins. Patients with a 2-year and longer follow-up (n = 141) had local recurrence in 3.5% when both FS and final margins were clean, 8.1% when FP margins were clean, and 16.7% with close/positive final margins. CONCLUSIONS: The proposed 'GAIM' protocol is a novel, effective, reproducible, and safe approach for margin evaluation that can be systematically applied. It can increase the rate of final clean surgical margins and potentially improve patients' outcomes. LEVEL OF EVIDENCE: 3 Laryngoscope, 134:1725-1732, 2024.

Oral erythroplakia and oral erythroplakia-like oral squamous cell carcinoma - what's the difference?

BACKGROUND: Oral erythroplakia (OE) is a rare oral potentially malignant disorder, that has a high rate of malignant transformation. The definition of OE still lacks uniformity. In particular, lesions that look clinically like erythroplakias, but are histopathologically diagnosed as squamous cell carcinomas are still sometimes called erythroplakias. The purpose of this study is to present demographic and clinicopathologic features of a series of OEs and clinically oral erythroplakia -like squamous cell carcinomas (OELSCC), to study their differences and to discuss the definition of OE. METHODS: A multicenter retrospective case series of OEs and OELSCCs. Descriptive statistics were used to analyze the data. RESULTS: 11 cases of OEs and 9 cases of OELSCCs were identified. The mean age of the OE patients was 71 years and 72.7% were female, while the mean age of the OELSCC patients was 69 years, and all were female. 9% of the OE and 22% of the OELSCC patients had smoked or were current smokers. 72.7% of the OEs and 55.5% of OELSCCs were uniformly red lesions. 63.6% of the OE and 22% of the OELSCC patients had a previous diagnosis of oral lichenoid disease (OLD). The malignant transformation rate of OE was 9% in a mean of 73 months. CONCLUSIONS: OE and OELSCC may arise de novo or in association with OLD. Tobacco and alcohol use were not prevalent in the present cases. The clinical features of OEs and OELSCC are similar, but symptoms, uneven surface and ulceration may be more common in OELSCCs than in OEs. Clinical recognition of OE is important since it may mimic other, more innocuous red lesions of the oral mucosa. The diagnosis of OE requires biopsy and preferably an excision. Clarification of the definition of OE would aid in clinical diagnostics.

Translation, Transcultural Adaptation, and Validation of the Hebrew Language Version of the Orthognathic Quality of Life Questionnaire for the Assessment of Quality of Life in Orthognathic Patients.

INTRODUCTION: Dentofacial deformities impose a negative impact on quality of life (QOL). Orthognathic surgery is the main pillar of treatment for these conditions and has proven its impact on the improvement of the functional and psychosocial aspects of QOL. The Orthognathic Quality of Life Questionnaire (OQLQ), developed by Cunningham and colleagues, is a well-established instrument for assessing QOL in patients with dentofacial deformities. OBJECTIVE: The aim of this study was to perform a translation, transcultural adaptation, and validation of a Hebrew version of the OQLQ. METHODS: Transcultural adaptation was done following guidelines proposed by Beaton and colleagues resulting in a pilot study conducted on 20 patients undergoing orthognathic surgery. Internal consistency, reliability, and sensitivity were evaluated by means of Cronbach alpha, intraclass correlation coefficient (test-retest), and Wilcoxon test, respectively. Validity was assessed by comparing the OQLQ with the Hebrew version of the Oral Health Impact Scale-14 (Oral Health Impact Profile Scale-14) using the Spearman correlation test. RESULTS: Internal consistency showed a good correlation between domains and excellent test-retest reliability. Sensitivity to change was statistically significant in all but 3 questions. The Hebrew version of the OQLQ exhibited a strong correlation with Oral Health Impact Profile Scale-14 in total score and moderate to high correlations among domains. CONCLUSION: The Hebrew version of the OQLQ is a valid and reliable and specific instrument to measure QOL for Hebrew-speaking patients undergoing orthognathic surgery.

Airway management following head and neck microvascular reconstruction: is tracheostomy mandatory?

Abstract Objectives: Airway management following maxillofacial microvascular reconstruction is a fundamental part of the perioperative management. In oral cavity microvascular reconstruction, the airway is potentially compromised by airway edema, flap edema or bulkiness, hematoma formation, or upper airway sequelae from surgery. Classical teaching advocates elective tracheostomy in patients undergoing maxillofacial free flap reconstruction, while others keep patients intubated overnight (delayed extubation). The optimal method for perioperative airway management is still debated. This study aim was to evaluate the morbidity associated with elective tracheostomy in patients undergoing maxillofacial microvascular reconstruction and to recognize those patients who can avoid elective tracheostomy. Methods: Retrospective review of patients who underwent maxillofacial microvascular free flap reconstruction, between November 1st 2010 and October 31st 2019 in our center. Results: One-hundred and nine patients underwent microvascular reconstruction in the maxillofacial region. Sixty-one patients underwent an elective tracheostomy upon the primary surgery. Forty-eight patients were left intubated overnight. Seven patients underwent a late tracheostomy which was performed upon a neck re-exploration for postoperative complications, except for one patient which was due to failed extubation attempt. Conclusions: Our results suggest, the routine use of elective tracheostomy in maxillofacial microvascular free flap reconstruction is unnecessary. Elective tracheostomy should be considered on case-to-case basis. Level of evidence: 4. HIGHLIGHTS Airway management following maxillofacial microvascular reconstruction is complex. Lack of consensus exists regarding the optimal airway management perioperatively. Routine use of tracheostomy is unnecessary. Tracheostomy should be considered on a case-to-case basis.

Airway management following head and neck microvascular reconstruction: is tracheostomy mandatory?

OBJECTIVES: Airway management following maxillofacial microvascular reconstruction is a fundamental part of the perioperative management. In oral cavity microvascular reconstruction, the airway is potentially compromised by airway edema, flap edema or bulkiness, hematoma formation, or upper airway sequelae from surgery. Classical teaching advocates elective tracheostomy in patients undergoing maxillofacial free flap reconstruction, while others keep patients intubated overnight (delayed extubation). The optimal method for perioperative airway management is still debated. This study aim was to evaluate the morbidity associated with elective tracheostomy in patients undergoing maxillofacial microvascular reconstruction and to recognize those patients who can avoid elective tracheostomy. METHODS: Retrospective review of patients who underwent maxillofacial microvascular free flap reconstruction, between November 1st 2010 and October 31st 2019 in our center. RESULTS: One-hundred and nine patients underwent microvascular reconstruction in the maxillofacial region. Sixty-one patients underwent an elective tracheostomy upon the primary surgery. Forty-eight patients were left intubated overnight. Seven patients underwent a late tracheostomy which was performed upon a neck re-exploration for postoperative complications, except for one patient which was due to failed extubation attempt. Patients who didn't receive an elective tracheostomy were younger and had a shorter duration of postoperative hospitalization. Seven patients suffered from tracheostomy- related complications, all of them underwent elective tracheostomy and none were from the late tracheostomy group. CONCLUSIONS: Our results suggest, the routine use of elective tracheostomy in maxillofacial microvascular free flap reconstruction is unnecessary. Elective tracheostomy should be considered on case-to-case basis.

Tumor Microenvironment in Oral Cancer Following Neoadjuvant Pembrolizumab: Preliminary Analysis of the Histopathologic Findings.

Background: The tumor microenvironment (TME) of oral squamous cell carcinoma (OSCC) is associated with immune suppression, one of the pathways being the programmed death receptor 1 (PD-1) and its ligands (PD-L1/PD-L2). Checkpoint inhibitors of PD-1/PD-L1, like pembrolizumab, have been recently approved for treatment of OSCC. We described the histologic findings in OSCC following neoadjuvant pembrolizumab, including identification of immune-related cell populations and cancer-associated fibroblasts (CAFs). Materials and Methods: Patients with OSCC clinical stages 3 and 4 and a combined PD-L1 score >1 were randomized either to the standard oncologic protocol or to the pembrolizumab arm of MK-3475-689 study for Head and Neck, Lip, and Oral Cavity. The latter were given two standard doses of 200 mg of pembrolizumab, 3 weeks apart, and then underwent surgical oncologic procedure according to the initial stage. Sections from the resection specimens were analyzed for pathological response to pembrolizumab. Various populations of immune-related cells within the tumor microenvironment were characterized by immunohistochemistry, as were the CAFs. Results: Three patients who were randomized to the pembrolizumab study were described. One patient presented with a tongue SCC, the other two had SCC of the mandibular ridge with bony involvement. Only the patient with tongue SCC showed clinical complete response. Microscopically, the tumor was replaced by a granulomatous type of inflammation. Immunohistochemical stains revealed massive T cell rich (CD3+) infiltrate, with approximately equal amounts of CD4+ and CD8+ cells, numerous macrophages of CD68+ and CD163+ phenotypes; no CAFs were identified. The other two patients were regarded as non-responders as at least 50% of the tumor was viable. The tumor microenvironment of these tumors was generally associated with a lesser extent of inflammatory response compared to the tongue tumor, a variable CD4+/CD8+ ratio and presence of CAFs. Neither T regulatory cells (FOXP3+) nor natural killer cells (CD56+, CD57+) were identified in any of the cases. Conclusion: We showed that characterizing the specific populations of immune-related cells and CAFs after treatment with pembrolizumab, may add to our understanding of the tumor-TME interactions in this setting. These findings should be investigated in future studies on a larger number of patients.

Restricted Mouth Opening in Head and Neck Cancer: Etiology, Prevention, and Treatment.

Restricted mouth opening or trismus is often encountered in patients with head and neck cancer. The restriction may be the presenting sign of malignancy, a sequela of tumor site or growth, an adverse effect of oncologic treatment, or a first sign of tumoral recurrence. In general, any insult to the temporomandibular joint, masticatory muscles, or their neural innervation may cause limitation in mouth opening. The etiologies leading to trismus are as follows: myospasm secondary to tumor infiltration; reflectory myospasm; radiation-induced myositis and myofibrosis; temporomandibular joint involvement with tumor; unfavorable postsurgical scarring; muscle and joint atrophy secondary to immobilization; pain; jaw fracture and hardware failure; and infection. Preventive measures should be implemented before, during, and after treatment. These measures include identification of high-risk patients, utilization of dose-sculpting radiation techniques whenever possible, performing reconstruction at the same time of resective surgery whenever feasible, and initiating mobilization exercises as early as possible. When trismus develops, treatments are often challenging and disappointing. These include physical therapy, mouth opening appliances, drug therapy, and release surgery. All medical specialties dealing with head and neck cancer should be familiar with the diagnosis and prevention of trismus and make an effort to ensure patients are referred to the appropriate care when needed. Trismus should not be considered a trivial sequela of head and neck cancer.

Ultrasound-Guided Botulinum Toxin Injections into the Salivary Glands for the Treatment of Drooling.

BACKGROUND: Drooling is the unintentional loss of saliva from the mouth, usually caused by poor coordination of the swallowing mechanism. It is commonly seen in patients with chronic neurologic disorders, such as Parkinson's disease, amyotrophic lateral sclerosis (ALS), cerebral palsy, and stroke, as well as in patients with cognitive impairment and dementia. OBJECTIVES: To evaluate the efficacy and safety of ultrasound-guided botulinum toxin injections into the parotid and submandibular salivary glands for the treatment of drooling. METHODS: We conducted a retrospective analysis of the medical records of 12 consecutive patients treated with botulinum toxin injections into the parotid and submandibular glands for the first time. The primary outcome variable was the subjective improvement of drooling on a 5-point scale. Secondary outcome variables were duration of the therapeutic effect, request to undergo additional treatment, and adverse events. RESULTS: Of 12 patients, 8 (67%) reported considerable improvement after treatment, 3 reported slight improvement, and 1 reported development of dry mouth. All patients stated that they felt the effects 1 week after the injections; the mean duration of the therapeutic effect was 4.5 months (range 3-9 months). One patient suffered from local hematoma and ecchymosis that did not require medical care. Another patient complained of difficulty swallowing, which did not require medical treatment and resolved spontaneously within 1 month. CONCLUSIONS: Ultrasound-guided botulinum toxin injections into the parotid and submandibular glands seem to be a safe and effective therapy for the treatment of drooling. Further long-term prospective studies with varying doses are warranted.

Three-Dimensional Orofacial Changes Occurring After Proportional Condylectomy in Patients With Condylar Hyperplasia Type 1B (Unilateral Hemimandibular Elongation).

PURPOSE: To evaluate 3-dimensional orofacial changes that occurred after proportional condylectomy that was not followed by orthognathic surgery in patients with condylar hyperplasia type 1B (unilateral hemimandibular elongation). MATERIALS AND METHODS: This retrospective analysis used the medical records of 14 skeletally mature patients. Transverse, vertical, and horizontal cephalometric analyses of photographs and radiographs were undertaken. A comparison of preoperative and postoperative measurements was conducted. RESULTS: After proportional condylectomy, transverse chin position and vertical lip cant improved to various degrees, whereas ramus and condyle height and mandibular lower border discrepancy worsened to different extents. The prominence of the gonial angle of the affected (operated) side increased in all patients after surgery, and this contributed to better symmetry only when the preoperative prominence was small (flat), whereas the opposite occurred when the preoperative prominence was large (bulky). After condylectomy, there was posterior displacement of the pogonion point (setback), which was favorable in cases with a preoperative concave profile and unfavorable in cases with a preoperative convex profile. CONCLUSION: Proportional condylectomy can successfully arrest the hyperplastic growth of the affected condyle; however, it rarely achieves perfect symmetry of the face. Although it improves some facial features, other facial traits are worsened. Surgeons should have a full understanding of the 3-dimensional changes occurring after proportional condylectomy and should be able to predict, based on preoperative findings, the anticipated improvement or worsening of different facial features.

The impact of chronic orofacial pain on daily life: the vulnerable patient and disruptive pain.

OBJECTIVE: To identify patient and pain characteristics associated with negative impacts on daily life among patients with chronic orofacial pain (COFP). STUDY DESIGN: Medical records of 200 COFP patients were analyzed. RESULTS: Diagnostic categories included temporomandibular disorders (85; 42.7%), headaches (47; 23.6%), neuropathic pain (37; 18.5%), trigeminal neuralgia (16; 8.0%), and painful posttraumatic trigeminal neuropathy (PTTN) (14; 7.0%). Of these, 47 (23.7%) had medical and 13 (6.5%) had psychiatric comorbidities and 71 (35.7%) experienced physical trauma. Seven (5%) had stopped working, and mean days absent from work was 3.3 ± 19.3. Patients were previously treated by 2.7 ± 1.4 caregivers. Mean scores on a 0-10 scale were as follows: pain (7.13 ± 2.3), sleep quality (6.6 ± 2.4), and quality of life (5.58 ± 3.1). PTTN patients were more likely to quit work (P = .009) and had more days absent from work (mean 24.3; P = .009). We identified patient and pain profiles that predict these poor outcomes. The "vulnerable patient" profile includes health and psychiatric comorbidities and trauma history, particularly PTTN. The "disruptive pain" profile includes severe, continuous, burning, electrical pain accompanied by systemic signs. These profiles intersect in a complex manner, creating a complex feedback loop. CONCLUSIONS: A multidisciplinary team approach is recommended to manage COFP patients, in order to improve treatment outcomes and avert more serious consequences.

Key architectural changes in tumor-negative lymph nodes from metastatic-free oral cancer patients are valuable prognostic factors.

Regional lymph node (LN) metastasis in oral cancer patients is the most significant grave prognostic factor. We evaluated the relationship between clinical outcomes and different histopathological changes in tumor-negative LNs (LN0) selected from neck dissections without metastatic disease (pN0). A total of 435 LN0 selected from pN0 neck dissections (up to three nodes in each level) were scored for histopathological parameters of LN areas, capsule thickness, subcapsular and medullary sinus ectasia, lobular architecture and percent of cortical reactive follicles. These were compared to 328 LN0 selected from neck dissections with metastases (pN+) after exclusion of metastatic LNs. Data were presented by maximum scores of each parameter in I-III (close) and in IV-V (distant) levels. Limited data from level V and regression analyses inferred that the values in level IV represented the worst changes for most patients. Cox proportional hazard regression on each parameter in close and distant levels demonstrated that capsule thickness, number of lobules and percent of reactive follicles were significantly associated with time to death from disease. The higher the change in distant levels, the shorter the time to death, while the higher the change in close levels (given a stable change in distant levels), the longer the time to death. After adjustment for gender, age and location, only the effect of the percent of reactive follicles retained their significant effect. Logistic regression of metastases demonstrated that all parameters except for percent of reactive follicles were significantly associated with risk of metastases, with differences between close and distant levels similar to those found for time to death. After adjustment for gender, age and location, only the area and number of lobes retained their significance. The findings of this study suggested that selective histopathological changes in tumor-negative LNs in metastatic-free patients provide new valuable prognostic parameters.

Cancer-associated fibroblasts, a parameter of the tumor microenvironment, overcomes carcinoma-associated parameters in the prognosis of patients with mobile tongue cancer.

Mobile tongue squamous cell carcinoma (MTSCC) is known for its strong propensity for regional metastasis and poor patient survival despite aggressive treatment, thus calling for new and reliable markers for predicting prognosis and guiding therapeutic management. Towards this end, three classes of markers were investigated: cancer-associated fibroblasts (CAFs; α-SMA positivity) as a representative of the tumor microenvironment, maspin (mammary serine protease inhibitor) as a tumor marker likely to be modulated by factors within the tumor microenvironment, and DNA content and Ki-67 labeling index as inbuilt tumor markers in 128 cases of MTSCC using immunohistochemistry and image cytometry. Of these markers, only CAF density was independently and relatively strongly associated with elevated mortality from MTSCC. The hazard ratio in the CAF-rich type of tumor microenvironment was 4.85 (95% CI 1.41-16.6, versus the CAF-poor) when adjusted by proportional hazards modeling for the center where the patient was managed, gender, tumor stage, presence of neck metastasis and age at diagnosis. CAF density was unrelated to non-MTSSC mortality. Given the strong association between increased CAF density and higher mortality in MTSCC, routine assessment of CAF density for disease course prognosis and inclusion as an integral part of treatment protocols are recommended.

Cancer-associated fibroblasts and epithelial-mesenchymal transition in metastatic oral tongue squamous cell carcinoma.

We examined cancer-associated fibroblasts (CAFs) and a panel of immunohistochemical markers of epithelial-mesenchymal transition (EMT) in 19 pair-matched oral tongue squamous cell carcinoma (SCC) and metastatic tumors to regional lymph nodes (RLNs). alpha-Smooth muscle actin (alpha-SMA) was studied to identify CAFs. EMT was studied with syndecan-1, Cadherin-11, fibroblast-specific protein (FSP)-1, secreted protein acidic and rich in cysteine (SPARC) and Twist. Triple immunostaining in RLNs was used to highlight the carcinoma cells (E-cadherin and Ki-67) and their relationship to the CAFs (alpha-SMA). We found that metastatic RLNs hosted CAFs similarly as in pair-matched primary tumors. Expression of EMT markers is common in both primary and metastatic tumors. We demonstrate that metastatic carcinoma cells (Ki-67 positive) downregulate E-cadherin expression at the periphery of cancer islands, where they are in direct contact with CAFs. The supporting connective tissue microenvironment also commonly expresses syndecan-1, Cadherin-11, FSP-1, and SPARC. In conclusion, CAFs are common to both primary and metastatic SCC. We hypothesize that CAFs not only promote tumor invasion but also facilitate metastases, either by cometastasizing and/or being recruited to lymph nodes. Evidence of EMT is common within primary tumors and metastatic SCC and may be further modulated by CAFs.

Oral tongue squamous cell carcinoma: recurrent disease is associated with histopathologic risk score and young age.

PURPOSE: To apply the Brandwein-Gensler et al.'s histopathologic risk score (RS) system and to evaluate its impact on locoregional recurrence and overall survival in a series of cases of oral tongue cancer, along with variables of patient age and margin status. METHODS: Sections of the resection specimens (N = 50) were submitted to a RS assignment of three components: the worst pattern of invasion, lymphocytic infiltration and perineural invasion. Risk scores of 0-2 were classified as low-to-intermediate and RSs > or = 3 were classified as high with respect to recurrence and survival. Margins were considered as "clean" if the tumor was > or = 5 mm away from them, otherwise they were defined as "positive". Patients < or = 60 years were considered "young" and those >60 years "old". Kaplan-Meier survival analysis with univariate and Cox multivariate regression model with stepwise forward selection tests were used. RESULTS: Univariate analysis showed that locoregional recurrence was negatively influenced by high RSs (P = 0.011), "young" age (P = 0.027) and positive margins (P = 0.027). Multivariate analysis revealed that the risk of recurrence was increased by high RSs (hazard ratio 11.14; P = 0.022) and "young" age (hazard ratio 3.41; P = 0.022). "Young" patients with high RSs had a higher frequency of recurrence rate compared to "young" patients with low-to-intermediate scores (P = 0.008) and "old" patients with low-to-intermediate and high RSs (P = 0.012 and P = 0.011, respectively). CONCLUSIONS: The histopathologic RS can serve to identify a subgroup of patients <60 years who have a high recurrence rate of oral tongue cancer, irrespective of the margin status.

Tumor-host histopathologic variables, stromal myofibroblasts and risk score, are significantly associated with recurrent disease in tongue cancer.

Margin status, a major prognostic parameter in oral cancer, was analyzed vis-à-vis the histopathologic parameters of risk scores and stromal myofibroblasts. Specimens of tongue carcinoma (n = 50) were submitted to a risk score assignment consisting of the worst pattern of invasion, lymphocytic infiltration, and perineural invasion. Frequency of stromal myofibroblasts (alpha-smooth muscle actin stain) was assessed. A triple immunostaining assay with E-cadherin, Ki-67 and alpha-smooth muscle actin was used to identify carcinoma cells undergoing epithelial-mesenchymal transition. Margins were considered 'clean' if the tumor was >or=5 mm away from them. Patients

Congenital granular cell epulis presents an immunohistochemical profile that distinguishes it from the granular cell tumor of the adult.

Congenital granular cell epulis (CGCE), a rare benign lesion arising from the mucosa of the alveolar ridges of the jaws in newborns, has a clinical course characterized by lack of further growth after birth. Histomorphologically, it resembles a granular cell tumor (GCT) of the adult. The histogenesis of this lesion is unclear. We submitted a series of five CGCEs to a large panel of antibodies in order to trace the origin of the constituent granular cells. The resultant immunohistochemical profile showed positivity of these cells to vimentin, NKI/C3, and PGP9.5. This does not confirm any particular cell type for the histogenetic origin of CGCE but may rather reflect a local metabolic or reactive change, providing supporting evidence that the lesion is of a non-neoplastic nature. In addition, the granular cells were non-reactive for S-100, NGFR/p75, and inhibin-alpha, which further contributes to the distinction between a CGCE and the adult GCT.

A prospective study of surgical margin status in oral squamous cell carcinoma: a preliminary report.

A protocol was created for prospective margin status evaluation of patients with Oral SCC. Margins are evaluated intra- and post-operatively during three stages. Patients were divided into three groups: group 1 in which one margins were sampled randomly, group 2 with frozen sections taken from the surgical bed and 3 in which they were taken from the tumor specimen itself. Patients in group 3 showed the best correlation with final margin status and survival.

The effect of sinus membrane perforation and repair with Lambone on the outcome of maxillary sinus floor augmentation: a radiographic assessment.

PURPOSE: The present study compared the regenerative outcome of sinus graft procedures in a group of patients who underwent the repair of an intraoperatively diagnosed sinus membrane perforation to that of a group of patients without sinus membrane perforations. MATERIALS AND METHODS: A sinus floor augmentation procedure was performed in 73 sinuses in 63 patients. In 28% of these sinuses a significant (> 5 mm) membrane perforation was observed intraoperatively. In these cases, the perforation was sealed with a freeze-dried human lamellar bone sheet, and the grafting procedure was carried out as planned. The following parameters were measured on panoramic radiographs immediately postoperatively and at the 6- and 24-month follow-up examinations: (1) the distance between the occlusal edge of the implant and the preoperative sinus floor, (2) the distance between the occlusal edge of the implant and the postoperative sinus floor, and (3) the distance between the occlusal edge of the implant and the alveolar crest. RESULTS: The patients whose sinus membranes were perforated experienced no complications. No statistically significant differences were found between the 2 groups in the parameters measured. DISCUSSION: Lambone was used in all cases in the present study. In no case did the sinus augmentation procedure have to be abandoned. CONCLUSION: It can be concluded that membrane elevation must be carefully executed to avoid membrane perforation, but that if it occurs, it is still possible to continue the procedure safely after repair.