Journal of Dental Specialities 2023;11(1):62–68 Content available at: https://www.ipinnovative.com/open-access-journals Journal of Dental Specialities Journal homepage: https://www.jdsits.in/ Case Report Lateral approach sinus (LAS) and crestal approach sinus (CAS): The unravelled paraphernalia for maxillary sinus membrane advancement Rinisha Sinha 1, *, Pranave P 2 , Aishwarya Sabharwal 1 , Nidhi Saripalli 1 , Shiksha Dhawan 3 , Nishita Bhosale 1 1 Dept. of Periodontology, Bharati Vidyapeeth (Deemed to be University) Dental College and Hospital, Pune, Maharashtra, India 2 Dept. of Oral and Maxillofacial Surgeon, Bharati Vidyapeeth Deemed to be University Dental College and Hsopital, Pune, Maharashtra, India 3 Dept. of Conservative Dentistry and Endodontics, Bharati Vidyapeeth (Deemed to be University) Dental College and Hospital, Pune, Maharashtra, India ARTICLE INFO Article history: Received 17-11-2022 Accepted 10-01-2023 Available online 28-03-2023 Keywords: Crestal approach sinus lift Hard tissue augmentation Lateral window approach sinus lift Platelet rich fibrin membrane Transalveolar approach sinus lift ABSTRACT The permanent replacement of missing teeth in the maxillary posterior tooth region becomes a tedious task when it is confounded with bone atrophies. To overcome this problem and achieve successful rehabilitation, maxillary sinus membrane elevation procedures have been advocated as the most reliable means. The lateral window technique and the crestal approach are two of the most common approaches. These technologically developed procedures have reported high success rates in cases of deficient residual bone. Over time, there have been many advancements in these techniques that led to the development of user-friendly kits like the Lateral approach Sinus (LAS) kit and the Crestal approach Sinus (CAS) kit. In this case series, we have reported two cases, treated with either of these approaches and have compared the same. We aim at highlighting their ease of application in the clinical field and the promising results obtained with their use. Our clinical experience disclosed that maxillary sinus membrane advancement using both the kits have proven to be a reliable technique for implant placement in sites where insufficient bone is available. This is an Open Access (OA) journal, and articles are distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 License, which allows others to remix, tweak, and build upon the work non-commercially, as long as appropriate credit is given and the new creations are licensed under the identical terms. For reprints contact: reprint@ipinnovative.com 1. Introduction Clinicians often face difficulty in placing implants in the posterior maxilla due to the commonly observed resorption after tooth loss, atrophy, or sinus pneumatization in the region, resulting in insufficient bone height. 1 A variety of solutions have been defined to overcome this quandary namely short implants, tilted implants, or maxillary sinus augmentation procedures. 2,3 Sinus floor elevation procedures are one of the popular, well-accepted, widely performed, and highly predictable procedure. Boyne and James 4 performed a two-stage * Corresponding author. E-mail address: doc.rinisha@gmail.com (R. Sinha). implant placement procedure using the lateral approach for sinus lift in 1980. Tatum (1986) 5 entered the sinus via the edentulous alveolar bone and conducted vertical tapping through the alveolar ridge to elevate the sinus floor. Later in 1994, Summers 6 gave modification of this technique in the form of explicit osteotomes of diverse radii that could elevate the sinus floor, while simultaneously increasing the thickness of the bone. In this case series, we have presented two cases that were performed using the CAS kit and LAS kit. The crestal approach sinus (CAS) kit (Osstem Implant Co., Busan, Korea) is an innovation that utilizes the crestal approach for elevating the sinus. It uses a unique drilling system in https://doi.org/10.18231/j.jds.2023.012 2320-7302/© 2023 Innovative Publication, All rights reserved. 62