Nikolai Lazarov
Biographic Data
| ID | 4146517 |
|---|---|
| NAME | Nikolai Lazarov |
| GIVEN NAMES | Nikolai |
| FAMILY NAME | Lazarov |
| SIGNATURE | LAZAROV N |
| AFFILIATIONS | Medical University of Sofia |
| ORCID | 0000-0003-3420-4346 |
| VERIFIED | Yes |
| TOTAL WORKS | 11 |
| TOTAL CITATIONS | 7 |
| WORKS AS AUTHOR | 11 |
| WORKS AS EDITOR | 0 |
| FIRST PUBLICATION YEAR | 2012 |
| LATEST PUBLICATION YEAR | 2024 |
| H-INDEX | 2 |
Sex estimation based on mandibular measurements
Medical imaging and machine learning are beneficial approaches in physical and forensic anthropology. They are particularly useful for the development of models for sex identification based on bone remains. The present study uses machine learning algorithms to create models for sex estimation based on mandibular measurements. The sample included head CT scans of 239 adult Bulgarians (116 males and 123 females). Three-dimensional coordinates of 45…
Anatomic variations in the frontal and occipital bones
Developmental variations in the cranial vault arise during early ontogenesis due to premature or delayed suture closure, non-union between the normal ossification centers, and emergence of additional ossification centers. These variations cause abnormal calvarial partition and are often associated with modifications of the overall cranial configuration. This study aims to evaluate the impact of metopic suture persistence and the development of su…
A comparative digital morphometric study of nasofrontal region in metopic and non-metopic cranial series
broad interorbital distance and wider, shorter and less prominent nasal bones compared to the non-metopic ones.
Data mining for peculiarities in the configuration of neurocranium when the metopic suture persists
The persistent metopic suture is an anatomic variation related to a specific skull configuration. Data on the proportionality of the neurocranium and the occurrence of additional variations when the metopic suture persists are still insufficient. This study presents a comparison between a metopic and a non-metopic homogenous cranial series. The most distinctive quantitative and qualitative characteristics of the skull configuration when the metop…
Sex estimation by Mastoid Triangle using 3D models
which was significantly greater on the right side. The MT dimensions showed sufficient discriminating power for sex estimation among Bulgarians (up to 89%), and the total MT area proved to be the best single sex discriminating trait. The test sample corroborated the usefulness of the MT in sex estimation demonstrating similar or higher overall accuracy rates.
Sagittal suture maturation
OBJECTIVES: The sagittal suture (SS) is assumed to be an initial site for the commencement of cranial suture closure as well as the most frequent spot of isolated craniosynostosis. The present study aimed to inspect the reorganization of the SS at the microlevel to assess the relation between its closure and aging and to establish whether it could be used as a reliable indicator in age-at-death prediction. MATERIALS AND METHODS: The SS was invest…
Digital radiomorphometric analysis of the frontal sinus and assessment of the relation between persistent metopic suture and frontal sinus development
OBJECTIVES: This study aimed to establish the frequency of the frontal sinus (FS) aplasia, to compare metopic and nonmetopic series and thus to assess the relationship between the preservation of metopic suture and FS development. MATERIALS AND METHODS: FSs were investigated in 230 dry skulls of adult males distributed into control (137) and metopic (93) series. They were visualized through industrial digital radiography. RESULTS: In the control …
Morphometric study of the mylohyoid bridging in dry mandibles
The frequency of the mylohyoid bridging was 10.99% (21 out of 191 mandibles) for the contemporary male series, 9.45% (12 out of 127) for the male series and 7.69% (10 out of 130) for the medieval female series. The comparison between both male series indicated slightly increasing of the mylohyoid bridging with time. No significant bilateral and sex differences in the frequency and pattern of distribution of the mylohyoid bridging were established…
Two cases of large bregmatic bone along with a persistent metopic suture from necropoles on the northern Black Sea coast of Bulgaria
The co-occurrence of a bregmatic bone and metopism is an extremely rare finding. In the present study we investigate, compare, and describe this uncommon combination in two skulls of a child and an adult male. Both samples were from the osteological collection of the Institute of Experimental Morphology, Pathology and Anthropology with Museum, Bulgarian Academy of Sciences. The skulls were obtained from archaeological excavations of two necropole…
Multiple Wormian bones and their relation with definite pathological conditions in a case of an adult cranium
Wormian bones, also known as intrasutural bones, are present as an anatomical variation in healthy individuals. However, a higher than the usual incidence can be an important feature of some congenital pathological conditions. In this study we describe a case of an adult cranium with multiple Wormian bones. The cranium was a single sample obtained from an archaeological excavation in Vinitsa, Northeastern Bulgaria, and probably dated in the Chalc…
Absence of foramen spinosum and abnormal middle meningeal artery in cranial series
In comparative and evolutionary aspects in humans, the middle meningeal artery enters the cranium through the foramen spinosum, whereas in great apes the middle meningeal artery can enter the cranium through foramen spinosum, through foramen ovale or through petrosphenoid fissure. Generally, in nonhuman primates the anterior meningeal system is associated with the ophthalmic branch of the internal carotid artery. The vessels joining the two syste…
Two cases of large bregmatic bone along with a persistent metopic suture from necropoles on the northern Black Sea coast of Bulgaria
The co-occurrence of a bregmatic bone and metopism is an extremely rare finding. In the present study we investigate, compare, and describe this uncommon combination in two skulls of a child and an adult male. Both samples were from the osteological collection of the Institute of Experimental Morphology, Pathology and Anthropology with Museum, Bulgarian Academy of Sciences. The skulls were obtained from archaeological excavations of two necropole…
Digital radiomorphometric analysis of the frontal sinus and assessment of the relation between persistent metopic suture and frontal sinus development
OBJECTIVES: This study aimed to establish the frequency of the frontal sinus (FS) aplasia, to compare metopic and nonmetopic series and thus to assess the relationship between the preservation of metopic suture and FS development. MATERIALS AND METHODS: FSs were investigated in 230 dry skulls of adult males distributed into control (137) and metopic (93) series. They were visualized through industrial digital radiography. RESULTS: In the control …
Sagittal suture maturation
OBJECTIVES: The sagittal suture (SS) is assumed to be an initial site for the commencement of cranial suture closure as well as the most frequent spot of isolated craniosynostosis. The present study aimed to inspect the reorganization of the SS at the microlevel to assess the relation between its closure and aging and to establish whether it could be used as a reliable indicator in age-at-death prediction. MATERIALS AND METHODS: The SS was invest…
Multiple Wormian bones and their relation with definite pathological conditions in a case of an adult cranium
Wormian bones, also known as intrasutural bones, are present as an anatomical variation in healthy individuals. However, a higher than the usual incidence can be an important feature of some congenital pathological conditions. In this study we describe a case of an adult cranium with multiple Wormian bones. The cranium was a single sample obtained from an archaeological excavation in Vinitsa, Northeastern Bulgaria, and probably dated in the Chalc…
Absence of foramen spinosum and abnormal middle meningeal artery in cranial series
In comparative and evolutionary aspects in humans, the middle meningeal artery enters the cranium through the foramen spinosum, whereas in great apes the middle meningeal artery can enter the cranium through foramen spinosum, through foramen ovale or through petrosphenoid fissure. Generally, in nonhuman primates the anterior meningeal system is associated with the ophthalmic branch of the internal carotid artery. The vessels joining the two syste…
Multiple Wormian bones and their relation with definite pathological conditions in a case of an adult cranium
Wormian bones, also known as intrasutural bones, are present as an anatomical variation in healthy individuals. However, a higher than the usual incidence can be an important feature of some congenital pathological conditions. In this study we describe a case of an adult cranium with multiple Wormian bones. The cranium was a single sample obtained from an archaeological excavation in Vinitsa, Northeastern Bulgaria, and probably dated in the Chalc…
Two cases of large bregmatic bone along with a persistent metopic suture from necropoles on the northern Black Sea coast of Bulgaria
The co-occurrence of a bregmatic bone and metopism is an extremely rare finding. In the present study we investigate, compare, and describe this uncommon combination in two skulls of a child and an adult male. Both samples were from the osteological collection of the Institute of Experimental Morphology, Pathology and Anthropology with Museum, Bulgarian Academy of Sciences. The skulls were obtained from archaeological excavations of two necropole…
Morphometric study of the mylohyoid bridging in dry mandibles
The frequency of the mylohyoid bridging was 10.99% (21 out of 191 mandibles) for the contemporary male series, 9.45% (12 out of 127) for the male series and 7.69% (10 out of 130) for the medieval female series. The comparison between both male series indicated slightly increasing of the mylohyoid bridging with time. No significant bilateral and sex differences in the frequency and pattern of distribution of the mylohyoid bridging were established…
Digital radiomorphometric analysis of the frontal sinus and assessment of the relation between persistent metopic suture and frontal sinus development
OBJECTIVES: This study aimed to establish the frequency of the frontal sinus (FS) aplasia, to compare metopic and nonmetopic series and thus to assess the relationship between the preservation of metopic suture and FS development. MATERIALS AND METHODS: FSs were investigated in 230 dry skulls of adult males distributed into control (137) and metopic (93) series. They were visualized through industrial digital radiography. RESULTS: In the control …
Sex estimation by Mastoid Triangle using 3D models
which was significantly greater on the right side. The MT dimensions showed sufficient discriminating power for sex estimation among Bulgarians (up to 89%), and the total MT area proved to be the best single sex discriminating trait. The test sample corroborated the usefulness of the MT in sex estimation demonstrating similar or higher overall accuracy rates.
Sagittal suture maturation
OBJECTIVES: The sagittal suture (SS) is assumed to be an initial site for the commencement of cranial suture closure as well as the most frequent spot of isolated craniosynostosis. The present study aimed to inspect the reorganization of the SS at the microlevel to assess the relation between its closure and aging and to establish whether it could be used as a reliable indicator in age-at-death prediction. MATERIALS AND METHODS: The SS was invest…
Data mining for peculiarities in the configuration of neurocranium when the metopic suture persists
The persistent metopic suture is an anatomic variation related to a specific skull configuration. Data on the proportionality of the neurocranium and the occurrence of additional variations when the metopic suture persists are still insufficient. This study presents a comparison between a metopic and a non-metopic homogenous cranial series. The most distinctive quantitative and qualitative characteristics of the skull configuration when the metop…
A comparative digital morphometric study of nasofrontal region in metopic and non-metopic cranial series
broad interorbital distance and wider, shorter and less prominent nasal bones compared to the non-metopic ones.
Anatomic variations in the frontal and occipital bones
Developmental variations in the cranial vault arise during early ontogenesis due to premature or delayed suture closure, non-union between the normal ossification centers, and emergence of additional ossification centers. These variations cause abnormal calvarial partition and are often associated with modifications of the overall cranial configuration. This study aims to evaluate the impact of metopic suture persistence and the development of su…
Sex estimation based on mandibular measurements
Medical imaging and machine learning are beneficial approaches in physical and forensic anthropology. They are particularly useful for the development of models for sex identification based on bone remains. The present study uses machine learning algorithms to create models for sex estimation based on mandibular measurements. The sample included head CT scans of 239 adult Bulgarians (116 males and 123 females). Three-dimensional coordinates of 45…
Medicine (9 works) · Craniofacial Disorders and Treatments (8 works) · Anatomy (7 works) · Forensic Anthropology and Bioarchaeology Studies (7 works) · Biology (5 works) · Skull (5 works) · Anatomy (4 works) · Fibrous joint (4 works) · Orthodontics (4 works) · Orthodontics and Dentofacial Orthopedics (4 works)