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- Master of Science (MS) School of Dentistry (89)
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Articles 121 - 150 of 214
Full-Text Articles in Dentistry
Cleaning Protocol For Implant Abutment Screws, Rocio Barocio Torano
Cleaning Protocol For Implant Abutment Screws, Rocio Barocio Torano
All ETDs from UAB
Aim: To develop a time and cost effective cleaning protocol for implant abutment screws that are used throughout the fabrication of an implant restoration in the dental laboratory. Materials and Methods: Ninety (90) implant abutment screws (Biohorizons PXAS®) were collected from different dental laboratories after abutment milling and restoration fabrication. Seventy five (75) of these screws were randomly divided into 5 groups (n=15). Each group was cleaned for 1, 5, and 10 minutes in an ultrasonic cleaner and all screws were observed under 40x magnification before and after cleaning. Any debris was collected and weighed by using paper filters. The …
Retentive Strength At The Zirconia Implant Abutment And Titanium Base Interface With Different Surface Treatments, Celin Arce
All ETDs from UAB
Screw-retained zirconia implant crowns with an internal titanium base have favorable mechanical properties compared to single piece zirconia implant crowns; however, they require adequate bonding between the zirconia crown and the titanium base. This study measures the retention between a titanium base and a full contour zirconia implant crown following different surface treatments of their bonded surfaces. Full contour zirconia implant crowns were fabricated to fit a 3.5mm titanium base. The crowns were bonded to the titanium bases following 4 protocols (n=15): no surface treatment (Group 1), MDP-primer on the intaglio of crown and exterior of base (Group 2), alumina …
A Comparison Of Soft Tissue Topographical Norms For The Local Ethnic People Of Zimbabwe And African American Norms Based On 3dmd Soft Tissue Photography, Elvin Bhaskar
All ETDs from UAB
Introduction: The purpose of this study is to determine the soft tissue topographical norms for the local ethnic people of Zimbabwe and compare them with the African American norms based on 3dMD soft tissue photography. The rationale for the study is to evaluate how the soft tissue drape over the facial skeleton correlates with the different soft tissue analysis widely available today. This study seeks to establish an average base on which clinicians can treat people according to their cultural esthetic perceptions. Previous reported studies only evaluate small numbers of populations and it is well known that different races and …
Retention Of Cad/Cam Crowns Luted With A Novel Biomimetic Cement, Nan Xiang
Retention Of Cad/Cam Crowns Luted With A Novel Biomimetic Cement, Nan Xiang
All ETDs from UAB
Objectives: To measure the tensile strength of e.max copings cemented with resin, calcium silicate and calcium phosphate cements following thermocycling. Methods: 40 extracted non-carious mandibular premolar teeth were examined and selected using Keyence microscope for no carious cracks etc.were mounted in acrylic. The teeth were placed in a lathe and prepared to uniform dimensions (22° total taper) using a flat-end tapered diamond bur (846.11.025HP, Brasseler) and a 3mm preparation height. The surface area of the prepared surface was calculated with digital microscopy. The teeth were scanned with a Cerec 3 (Sirona) digital scanner. E.max crowns were milled using Cerec 3 …
Three-Dimensional Age-Related Changes Of The Adult Male Face, Catherine Haynie Haynie
Three-Dimensional Age-Related Changes Of The Adult Male Face, Catherine Haynie Haynie
All ETDs from UAB
Objectives: The adult population is a fast growing subgroup of orthodontic practices. The facial soft tissues of adults are different from adolescents, and there is significant sexual dimorphism in the aging of facial soft tissue. It is imperative for the orthodontist to understand how aging effects the soft tissues of the face, and to know how male and females differ in this process. The objectives of this study include: 1.) Identification of trends in facial aging among a Caucasian male and African American male sample utilizing three-dimensional surface imaging technology. 2.) Comparison of the aging effects between the Caucasian and …
The Comparison Of 3-Dimensional Soft-Tissue Of Adult Korean, Chinese, And Houstonian Caucasian Patients With Class I Malocclusion, Jamie Youngshin Kim
The Comparison Of 3-Dimensional Soft-Tissue Of Adult Korean, Chinese, And Houstonian Caucasian Patients With Class I Malocclusion, Jamie Youngshin Kim
All ETDs from UAB
The purpose of this study is to compare the computer generated facial averages of Korean adults with Chinese and Houstonian Caucasian faces using a three-dimensional surface imaging system. Materials and Methods: Three-dimensional images of Korean adults (Seoul, Korea) with Class I malocclusion were captured using the 3dMDTMface, which combines structured light and stereo-photogrammetry techniques. The images of 138 Koreans were processed to generate average male and female facial shells using Rapidform 2006 Plus Pack 2 software. The average Korean facial shells were superimposed and compared to the average shells of Chinese adults (Xi’an, China) and Caucasian adults (Houston, Texas) from …
Anteroposterior (Ap) Relationship Of The Maxillary Central Incisors To The Forehead In Adult African American Females, Matthew Philip Gidaly
Anteroposterior (Ap) Relationship Of The Maxillary Central Incisors To The Forehead In Adult African American Females, Matthew Philip Gidaly
All ETDs from UAB
Objective: Determine the optimal anteroposterior (AP) relationship of the maxillary central incisors to the forehead in adult African American females (AAF). Materials and Methods: Smile profile photographs of 48 AAF with optimal AP incisor positions (control); 49 seeking/wanting orthodontic treatment (Group 1), and 53 not seeking/wanting treatment (Group 2) were acquired. All images were scaled to life-size and printed. The AP position of the maxillary central incisors and forehead inclination were measured relative to reference lines. Results: The mean AP position of the maxillary central incisors relative to Glabella Vertical (GV) for the controls was 8.58 ± 3.96 mm ahead …
Light Transmitting Fiber Posts - An In Vitro Evaluation., Antigoni Stylianou
Light Transmitting Fiber Posts - An In Vitro Evaluation., Antigoni Stylianou
All ETDs from UAB
Objectives: The primary purpose of this study is to measure and compare the light transmission, radiopacity and microscopic structure of a new fiber optic post compared to a clinically successful fiber post. Materials and Methods: A. The radiopacity of seven posts was evaluated in terms of average intensity values calculated in histograms produced by computer-based software. B. The two types of fiber posts were examined by scanning electron microscopy (SEM) and evaluated by computer-assisted image analysis. C. Two experimental groups with sample size n=12 included the D.T. Light posts and iLumi Fiber Optic posts. Two aluminum assemblies forming two cylindrical …
The Accuracy Of A Clinician's Assessment Of Insertion Torque At Implant Placement, Britany Fabian Matin
The Accuracy Of A Clinician's Assessment Of Insertion Torque At Implant Placement, Britany Fabian Matin
All ETDs from UAB
Background: Primary implant stability contributes to the success of dental implant placement and affects long-term function. Factors that contribute to the primary stability and osseointegration of a dental implant include the quality and quantity of bone present at the site of placement as well as the shape and surface treatment of the implants. There are numerous methods that assist the clinician in determining implant stability during placement and to confirm osseointegration after a period of healing. Their reliability to predict implant success, however, has not been proven. Torque measurements acquired during implant placement have been used as a method for …
A Study Of The Relationship Between Nasion Perpendicular And The True Vertical Line, Jeffrey Shelley
A Study Of The Relationship Between Nasion Perpendicular And The True Vertical Line, Jeffrey Shelley
All ETDs from UAB
A STUDY OF THE RELATIONSHIP BETWEEN NASION PERPENDICULAR AND THE TRUE VERTICAL LINE JEFFREY ALBERT SHELLEY JR. DEPARTMENT OF ORTHODONTICS ABSTRACT The purpose of this study is to assess the relationship between Nasion perpendicular and the true vertical line between patient groups using cephalometric analysis. Materials and Methods: Ninety-six adolescent patients comprised the sample for this study. Subjects were between 10 and 18 years old, with no major craniofacial deformity. Three groups of patients were divided in to three groups (Class I, Class II and Class III) based on their skeletal antero-posterior relationship. Pre-treatment lateral cephalometric radiographs were taken with …
Translucency, Stain Resistance And Hardness Of Composites Used For Invisalign Attachments, Katelyn Bowman Feinberg
Translucency, Stain Resistance And Hardness Of Composites Used For Invisalign Attachments, Katelyn Bowman Feinberg
All ETDs from UAB
The purpose of this study is to compare the translucency parameter, stain resistance and hardness of dental restorative composites and orthodontic adhesives in order to determine an ideal esthetic attachment material for Invisalign® treatment. Materials and Methods: Two dental restorative composites (Filtek™ Supreme Ultra, Tetric EvoCeram®) and three orthodontic adhesives (L.C.R.™, Transbond™ XT, Phase II® Dual Cure) were used in this in-vitro study. 2.0 mm thick samples of each material were fabricated in silicone molds covered with a flat sheet of Invisalign attachment template material. To evaluate the translucency parameter and stain resistance, initial L*a*b* values of each material were …
Three-Dimensional Soft Tissue Analysis Of Facial Morphology Of A Colombian Population Compared To Adult Caucasians, Sonia Bravo-Hammett
Three-Dimensional Soft Tissue Analysis Of Facial Morphology Of A Colombian Population Compared To Adult Caucasians, Sonia Bravo-Hammett
All ETDs from UAB
Aim: The purpose of this study is to describe the facial morphology of a Colombian population with three-dimensional imaging; and comparing their facial morphology with the Caucasian to create a database for this ethnicity. Materials and Methods: The study included 170 subjects selected from the Valle University in Cali-Colombia; and 1346 Caucasian subjects selected from the Face-Base Data funded by the National Institute of Dental and Craniofacial Research. All images were taken on Natural Head Position and captured using a stereo-photogrammetric camera system (3dMDfaceTM); to obtain a three dimensional image of each patient. The subjects were between 19 to 31 …
Preparation Of Zirconia For Bonding Following Salivary Contamination, Pattarika Angkasith
Preparation Of Zirconia For Bonding Following Salivary Contamination, Pattarika Angkasith
All ETDs from UAB
Purpose: To determine the best method of cleaning saliva-contaminated zirconia in order to regain its bond strength. Methods: Flat blocks of zirconia were particle-abraded with aluminum oxide and divided into eight groups (n=10). Groups 1-5 were first treated with 1 coat of an MDP-primer (Z-Prime Plus, Bisco) and groups 5-8 were left untreated. All specimens were contaminated with human saliva for 3 minutes other than the control (group 1). The specimens were then cleaned by rinsing with water for 20 sec (groups 2 and 5), cleaning with 35% phosphoric acid for 20 sec and rinsing (group 3 and 6), cleaning …
In- Vitro Wear Of Four Cad-Cam Materials In The Uab Wear Simulating Device, Ritika Bansal
In- Vitro Wear Of Four Cad-Cam Materials In The Uab Wear Simulating Device, Ritika Bansal
All ETDs from UAB
In- vitro Wear of Four CAD- CAM Materials in the UAB Wear Simulating Device RITIKA BANSAL MS IN CLINICAL DENTISTRY ABSTRACT Hybrid ceramic/polymer blocks represent a new category of CAD/CAM materials that do not require heat treatment following milled fabrication and limited clinically relevant mechanical properties of these materials are available. Purpose: This study measures the hardness, flexural strength, modulus, and wear of 3 ceramic/polymer hybrid materials (LAVA Ultimate, Enamic, and Cerasmart), 2 reference glass ceramics (IPS e.max and Celtra Duo), and 1 reference composite material (Paradigm MZ100). Methods: Flexural strength specimens (n=10) (2.5 Ã 2.5 Ã 16 mm) were …
The Effect Of Bone-Implant Contact And Elastic Modulus In The Biomechanical Stability Of Temporary Anchorage Devices, Ghada Nimeri
The Effect Of Bone-Implant Contact And Elastic Modulus In The Biomechanical Stability Of Temporary Anchorage Devices, Ghada Nimeri
All ETDs from UAB
ABSTRACT The purpose of this study was to analyze the microstrains of compact and trabecular bone caused by loading of different miniscrews at different healing times, and to compare these results to the limits of bone stability maintenance based on the Frost Mechanostat Theory. Materials and Methods: Theoretical calculations of microstrains of bone surrounding 10 different miniscrews were done. These miniscrews were considered under loading forces of 500 gm., and the microstains of both trabecular and compact bone were calculated separately when the thickness of the compact bone was at 1mm or 2mm. The microstrains were calculated at 4 different …
Long-Term Stability Of Lefort I Maxillary Downdraft With Rigid Internal Fixation, Stephen Leonard Strickland
Long-Term Stability Of Lefort I Maxillary Downdraft With Rigid Internal Fixation, Stephen Leonard Strickland
All ETDs from UAB
ABSTRACT Objective: The objective of this study is to evaluate the skeletal and dental stability of a Le Fort I maxillary downgraft after a minimum 4year follow up period. Methods: This retrospective cohort study evaluated 18 patients' post-surgical stability after Le Fort I maxillary downgraft performed by a Z-osteotomy. Pre-surgical (T1), post-surgical (T2), post-orthodontic (T3), and long-term follow-up (T4) cephalometric radiographs were digitized and analyzed with Dolphin Imagining via a custom analysis to evaluate linear and angular skeletal and dental relapse. Results - The average Le Fort I maxillary down graft was 3.6mm. The average post-surgical orthodontic phase was 7.4 …
Three-Dimensional Age-Related Changes Of The Adult Face; African American Female Population, Christina Theresa Sutherland
Three-Dimensional Age-Related Changes Of The Adult Face; African American Female Population, Christina Theresa Sutherland
All ETDs from UAB
Objectives: Treatment of older adults is one of the fastest growing areas in orthodontic practice. The objectives of this study are to: 1. Investigate the aging of the female African American face using three-dimensional surface imaging to understand how the soft tissue of the face matures in relation to the teeth and 2.) Compare the effects of aging on African American female faces to aging of Caucasian female faces. Methods: This is a cross-sectional study of 100 African American females with balanced faces. Five age groups (in years) were included: [20-30], [31-40], [41-50], [51-60], [61-70]. Three-dimensional (3D) surface images of …
Consequences Of Trps1 Deficiency On Dentinogenesis, Morgan Goss
Consequences Of Trps1 Deficiency On Dentinogenesis, Morgan Goss
All ETDs from UAB
Dentinogenesis is a complex process of dentin formation. It involves differentiation of odontoblasts, the cells that make dentin, and the formation of a unique extracellular matrix, known as dentin. Dentin is ultimately produced through the interaction of collagen fibers, non-collagenous proteins and hydroxyapatite (HA) crystals. Odontoblasts are cranial neural crest (CNC) ectomesenchymal derived cells. Trps1 is a novel transcription factor believed to play an important role in both tooth formation and the mineralization process. TRPS1 gene mutations are known to result in dental and skeletal abnormalities manifested in humans as tricho-rhino-phalangeal syndrome (TRPS) and Ambras syndrome. Trps1 expression varies throughout …
Intra-Oral Scanning Devices Compared To Traditional Digital Impressions, Terpsithea Christou
Intra-Oral Scanning Devices Compared To Traditional Digital Impressions, Terpsithea Christou
All ETDs from UAB
The aim of this study is to review the state of art concerning 3D optical acquisition techniques and devices currently used in Orthodontics, and determine whether a commercial intra-oral scanner is as accurate as traditional impressions for orthodontic purposes. Materials and Methods: Records of 30 subjects were prospectively acquired and digital models were obtained using an intra-oral scanner, LythosTM by Ormco, and an extra-oral scanner, GOM ATOS Triple Scan II by GOM. Seven parameters indicating linear measurements from predetermined landmarks were measured and analyzed. Paired t tests, plots and bars and Bland and Altman Analysis were used to compare and …
Upper Incisors Position Changes After Orthodontic Treatment In Class I, Ii And Iii Malocclusions, Konstantinos Bakos
Upper Incisors Position Changes After Orthodontic Treatment In Class I, Ii And Iii Malocclusions, Konstantinos Bakos
All ETDs from UAB
Objective: The purpose of this study was to evaluate the maxillary central incisor position changes after orthodontic treatment in Class I, II and III malocclusions. Material and Methods: This retrospective cohort study evaluated nighty non extraction orthodontic Class I, II and III cases which were collected randomly from the Orthodontic clinic at the University of Alabama at Birmingham and the Institutional Review Board of the University of Alabama at Birmingham approved the study. All the chosen cases were treated with fixed appliances and according to the standards of American Board of Orthodontics. All the lateral cephalo-metric radiographs were taken using …
Retention Of Cad/Cam Crowns Luted With Resin Cements And Rmgi, Shruti Sushilkumar Sonavane
Retention Of Cad/Cam Crowns Luted With Resin Cements And Rmgi, Shruti Sushilkumar Sonavane
All ETDs from UAB
Objectives: To measure retention of lithium disilicate (IPS e.max CAD, Ivoclar Viva-dent) and zirconia reinforced lithium disilicate (CELTRATM DUO, Dentsply) copings luted using resin cements and resin-modified glass ionomer cement. Methods: 110 Extracted human, non-carious mandibular 2nd premolars (n=10) were embedded in PVC cylinders with acrylic resin and placed into a lathe to produce a uni-form crown preparation (22°-convergence & 3mm-height). Following the orientation groove placement (69L bur), preparations were scanned and milled using a CEREC 3D/Sirona machine to produce e.max and CELTRATM DUO crowns. Preparations were imaged with a digital microscope (Keyence/VHX-600-20X) and the surface area of each crown …
Changes In The Frontal Soft Tissue Of The Lower Face By Age And Sex, Maggie Law
Changes In The Frontal Soft Tissue Of The Lower Face By Age And Sex, Maggie Law
All ETDs from UAB
The purpose of this study is to determine age-related changes of the lower face by age and by gender. The secondary purpose of this study is to stress the importance of the clin-ical exam for orthodontic patients in the frontal view, the way most patients perceive themselves. Also, individualized treatment planning with age-appropriate incisor display is crucial for esthetic outcomes. Materials and Methods: Specific dimensions of the lower face were measured at patients initial clinical exam before starting orthodontic treatment. All patients were from Dr. David Sarver's private practice in Vestavia Hills, AL collected from 1/1/2002-11/4/2014. The following parameters were …
Comparison Of Three Fluoride Dentifrice Products In The Prevention Of White Spot Lesions In Orthodontic Treatment, Anna B. Palombini
Comparison Of Three Fluoride Dentifrice Products In The Prevention Of White Spot Lesions In Orthodontic Treatment, Anna B. Palombini
All ETDs from UAB
Introduction:. During the course of orthodontic treatment, enamel decalcification is a common problem. Demineralized enamel, the precursor to caries formation, can be attributed to fixed orthodontic appliances and prolonged exposure to bacterial plaque. Progression to clinically detectable white spot lesions may occur as early as one month following the placement of orthodontic appliances. Such problems have influenced clinicians to search for a solution. Because fluoride treatment immediately upon debonding is not advocated, clinicians have proposed fluoride treatment and fluoride-releasing materials at the commencement of the therapy. The two new anti-cavity toothpastes, ClinproTM 5000 with 1.1% Sodium Fluoride and ClinproTM Tooth …
Bond Of Dual Cure Resin Cements To Enamel And Dentin In Self Cure Mode, Rashmi Radhakrishnan
Bond Of Dual Cure Resin Cements To Enamel And Dentin In Self Cure Mode, Rashmi Radhakrishnan
All ETDs from UAB
Dual cured resin cements are frequently used to cement all ceramic restorations. The increased thickness and /or opacity of restorations block light transmission. In these situations, where little or no light can be transmitted through the restorations, the polymerization of the cement is in the self-cure mode. Purpose: This study measures the bond strength and mode of failure of dual cure resin cements to enamel and dentin in a self-cure mode using e.max rods. Methods: 160 extracted human molars were ground to mid-coronal dentin (N=80) or superficial enamel (N=80) and finished to 320 grit disks. Four adhesive/cement combinations - Multilink …
A Prospective Randomized Clinical Trial To Assess The Performance Of Microtextured Dental Implants With Or Without A Machined Collar- 1 Year Results, Elizabeth Felts Randall
A Prospective Randomized Clinical Trial To Assess The Performance Of Microtextured Dental Implants With Or Without A Machined Collar- 1 Year Results, Elizabeth Felts Randall
All ETDs from UAB
Aim: To assess the performance of microtextured dental implants with or without a machined collar at one year after placement. Material and Methods: Fifty-eight patients received dental implant therapy to restore missing teeth in one area of the maxilla or man-dible at the UAB Department of Graduate Periodontology. Residents in the program placed microtextured implants with a microtextured collar with microgrooves (test group) and microtextured implants with a machined collar (control group). Sites were randomized to the test group or control group. Study visit protocol was followed and implants were restored by off-site dentists. Sixty-nine (69) implants were assessed at …
Perceptions Of Facial Attractiveness: Outcomes Of Orthognathic Surgery, Brittany Bross Reid
Perceptions Of Facial Attractiveness: Outcomes Of Orthognathic Surgery, Brittany Bross Reid
All ETDs from UAB
PERCEPTIONS OF FACIAL ATTRACTIVENESS: OUTCOMES OF ORTHOGNATHIC SURGERY BRITTANY REID DEPARTMENT OF ORTHODONTICS ABSTRACT Perceptions of physical attractiveness contribute to generalized assumptions that can create significant bias in social decision-making. Because these biases exist, patients often seek ways to improve facial harmony and overall appearance. Orthodontics and orthognathic surgery are treatment modalities that may be considered as a means to achieve facial balance. Orthodontists and oral surgeons must have an understanding of facial beauty and how to properly carry out techniques in order to preserve or improve facial balance. More importantly, the treatment goals of the patient and clinician(s) must …
Detection Of Scardovia Genus From Oral Samples In Children Using Real-Time Quantitative Polymerase Chain Reaction, Jungyi Alexis Liu
Detection Of Scardovia Genus From Oral Samples In Children Using Real-Time Quantitative Polymerase Chain Reaction, Jungyi Alexis Liu
All ETDs from UAB
Streptococcus mutans (Sm) and Streptococcus sobrinus (Ss) , are considered the major bacterium associated with dental caries. However, recent findings identify Scardovia species (Sc) is associated with early childhood caries, with or without the presence of Sm or Ss. This IRB approved study quantified the presence of Sm and Sc in saliva by real-time quantitative PCR (qPCR) in relation to caries. Saliva samples were collected from 72 preschool children in a high-caries risk community in rural Alabama. SYBR Green-based qPCR using extracted DNA and primers specific for Sm, Ss, Sc and total bacteria determined the copy number (CN/ml). Twenty two …
Regulatory Control Of Palatogenesis And Odontogenesis By Specificity Protein 7, John Christopher Clarke
Regulatory Control Of Palatogenesis And Odontogenesis By Specificity Protein 7, John Christopher Clarke
All ETDs from UAB
Runx2 and its downstream target Specificity Protein 7 (Sp7) are essential for skeletogenesis. In humans, mutations in Sp7 gene are associated with osteogenesis imperfecta. Unlike Runx2, the role of Sp7 in palatogenesis, tooth development or differentiation of ameloblasts and odontoblasts remains unknown. The main goal of this research was to identify the functional requirement of Sp7 transcription factor during tooth development and palatogenesis. Molecular, biochemical, and histological approaches were employed to answer this question. We established Sp7-null mice that are completely void of mineralized tissue, exhibit craniofacial dysmorphogenesis and die shortly after birth. Surprisingly, Sp7 homozygous mutants exhibited normal tooth …
Analysis Of Debris From Implant Prostheses, Mehran Varedi
Analysis Of Debris From Implant Prostheses, Mehran Varedi
All ETDs from UAB
Objectives: The specific aim of this study was to analyze any entrapped debris in implant abutment screw threads from post processed constructs from dental laboratories. Materials and Methods: Forty implant screws were used to collect debris where screws were removed from the implant prosthesis as received from dental laboratories. In all samples, laboratory procedures including fabrication of the custom abutment, definitive prosthesis and finishing/polishing were completed prior to sampling. Twenty-nine screws were from titanium and eleven screws were from zirconia abutments. Scanning Electron Microscope (SEM) analyses of collected particulate products from abutment screws were done for all specimens. Results: The …
Clinical Evaluation Of Non-Carious Cervical Lesions- A Five Year Prospective Evaluation, Kanchan Sawlani
Clinical Evaluation Of Non-Carious Cervical Lesions- A Five Year Prospective Evaluation, Kanchan Sawlani
All ETDs from UAB
Non-carious cervical lesions (NCCLs) have a non-bacterial origin and produce a loss of tooth structure at the cemento-enamel junction. A review of the literature reveals that these lesions may have a multifactorial etiology (chemical, abrasion, abfraction). The role of heavy biting forces in the pathogenesis of NCCLs is yet to be firmly established. Treatment and preventive measures for NCCLs can be improved if the etiology can be clearly identified and treated.Objective: This prospective clinical trial measured the volume loss (increase in size) of NCCLs and the occlusal biting forces applied to these teeth; diet and tooth brushing analysis, followed by …